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Primary hepatocytes of the rainbow trout (Oncorhynchus mykiss), flounder ( Platychthis ¯esus), dab influence testosterone metabolism directly by induction
Human hepatocytes for studies of overall metabolism (phase I and phase II) and and their metabolites as well as testosterone, estradiol and JP-8 components
We present a technique with cryopreserved hepatocytes that allows the induction of testosterone metabolism with similar induction factors as for fresh cultures.
Determination of testosterone metabolites in human hepatocytes. I. Development of an online sample preparation liquid chromatography technique and mass
(B(a)P), on the testosterone metabolism in the invertebrate Neomysis integer P4501A induction and testosterone hydroxylation in cultured hepatocytes of
and cytochrome P450 1A1 activity (EROD assay) over a 35 day period compared with hepatocyte only spheroids. Testosterone metabolism (HPLC) is increased
e TH, testosterone hydroxylation. New Hepatocyte In Vitro Systems for Drug Metabolism. 149. MARCEL DEKKER, INC. • 270 MADISON AVENUE • NEW YORK,
to the apparent inhibition of microsomal P-450 enzyme responsible for the metabolism of testosterone in the diseased hepatocytes. •. Die Leber spielt bei der
Publication » Auto-inhibition of verapamil metabolism in rat hepatocytes of gel by the formation rates of 6β-hydroxy testosterone and 1'-hydroxy midazolam.
Contains details of Cryopreservation rat mouse hepatocytes II Assessment metabolic capacity testosterone metabolism.
surprisingly, little is known about the metabolic capacity of heart muscle cells. .. Figure 6 Testosterone metabolism in cardiomyocytes (a) and hepatocytes (b)
Cryopreservation of viable hepatocyte monolayers in cryoprotectant media with high serum content: metabolism of testosterone and kaempherol post-
Testosterone Hydroxylation - Hydroxylation of testosterone to 6-β- hydroxytestosterone by CYP3As is characteristic of human hepatocytes (3). Figure 2 shows the
"In the present study, primary cultures of rat hepatocytes were treated for 48 and BROD, but not CYP3A23 mRNA or testosterone 6 beta-hydroxylation, Chang and colleagues published their study in Drug Metabolism and
METHODS: Isolated porcine hepatocytes and a polymer solution composed of AN69 were was analyzed by Western blot and by testosterone 6-beta- hydroxylation assay. Browse drug metabolism articles via key phrases:
The male-specific testosterone 2alpha/16alpha- hydroxylase
Modulation of hepatic sterol and steroid metabolism is a plausible mode of action Comparison between liver and rat primary hepatocytes showed a targeted phase III transporters, and metabolism of testosterone are robust candidates for
'Cytochrome P450 induction and metabolism of alkoxyresorufins, ethylmorphine and testosterone in cultured hepatocytes from goats, sheep and cattle.
Responsiveness of an SV40-immortalized hepatocyte cell line to growth hormone. of progestins on testosterone-stimulated hepatic ethylmorphine metabolism
fect the inactivation metabolism of irinotecan into 7-ethyl-10- droxytestosterone remained unaffected in other hepatocyte prep- arations.
Toxicogenomics applied to cultures of human hepatocytes enabled an synthesis, urea and testosterone metabolism to assay for CYP monooxygenase activity.
2 Carbohydrate & Lipid Metabolism/Synthesis in the Liver The lobules are composed of hepatocytes, which make up 70-80% of the mass of the . Examples of these would include testosterone, thyroxine and oestrogen.
testosterone metabolites in culture media reflecting metabolic activity of cultured human and animal hepatocytes demonstrated [1]. In this following contribution
mediated insulin degradation were investigated in hepatocytes could therefore contrib- ute to altered insulin metabolism and hyperinsulinemia in some . ing a- day-old female pups with 1.0 mg testosterone propionate in corn oil
In a study to monitor its oral availability and to identify the sites of metabolism, .. increase in the incidence of foci of altered hepatocytes and hepatic nodules
These hepatocyte studies showed that rodent hepatocytes were able to metabolise Compound Ain vitro. In males, testosterone metabolism was almost totally
Modulation of hepatic sterol and steroid metabolism is a plausible mechanism for triazole induced increases in serum testosterone. The gene expression
BD Biosciences provides both fresh and cryopreserved hepatocytes to support major applications in drug and xenobiotic biotransformation. Drug Metabolism
more relevant to htunans, namely human hepatocytes, show induction of CYP isoforms by DEET, . effects on testosterone metabolism are being investigated.
to 2004 on hypogonadism, testosterone and metabolic syndrome was performed. Results: .. hepatocyte cell culture studies showing the inhibition of
cytosol, S9 fraction, cell lines, transgenic cell lines, primary hepatocytes, liver slices, and perfused liver. A general . Testosterone C6-ß-hydroxylation. Preferred the adsorption disposition metabolism elimination of a drug is essential in the
Analysis of basal CYP activities and testosterone metabolism revealed that Δ202 cells showed higher similarities to mouse hepatocytes than Hepa 1c1c7
( C ) Differences in testosterone metabolism among different microencapsulated hepatocytes at various time points. All data points are presented as mean ± SD.
In contrast, testosterone metabolism was retained in primary hepatocytes in sandwich cultures at a higher level than in collagen film or gel cultures. Expression
Prediction of metabolic clearance using fresh human hepatocytes: Comparison with (by testosterone, up to 14-fold) among the major pathways was observed.
The metabolism of [14C]BMS-299897 was investigated in human liver microsomes, in rat, dog, monkey and human hepatocytes and in bile duct cannulated rats.
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A Human Hepatocyte Cell Line—By Tissue Engineering. Within Alginate . Testosterone is metabolized by CYP3A4 yielding 6 - testosterone as a major
sion of metabolism enzymes after hepatocyte exposure to xenobiotics, and conventional probe substrates (bupropion HCL and testosterone)
We show increased and idiosyncratic metabolism of testosterone in .. a gene expression in Aroclor 1254-treated rat hepatocyte cultures.
more relevant to humans, namely human hepatocytes, show induction of CYP isoforms by DEET, . effects on testosterone metabolism are being investigated.
In addition, direct conjugation of testosterone by phase-II metabolizing . was characterized by increased size and cytoplasmic eosinophilia of hepatocytes that
Hepatocytes are liver epithelial cells used for both basic research and drug These include the major phase I drug metabolism enzyme family (P450) and phase II 200 μM Testosterone as a substrate to measure CYP3A4 (left graph) activity
tatic zinc metabolism, particularly those related to MT, are influenced by certain .. testosterone levels in carcinoma compared with benign hyper trophy (14). mary rat hepatocytes (6) or HeLa cells (21 ), there is a relatively large amount of
3. Analysis of basal CYP activities and testosterone metabolism revealed that Delta 202 cells showed higher similarities to mouse hepatocytes
I metabolism QC : TEC and testosterone as standard, but up to 9 enzyme activities can be measured (see below). I human hepatocytes incubated in suspension
'Regulation by growth hormone and glucocorticoid of testosterone metabolism in long-term cultures of hepatocytes from male and female rats.
Many drug-drug interactions are metabolism based and mediated primarily via the Cryopreserved human hepatocytes are an intact cell model system of the (acetaminophen and 6-β-OH-testosterone, respectively) relative to vehicle
aflatoxin B1 metabolism;; bovine hepatocytes;; bovine CYP450;; CYP450 2β- and 6β-hydroxy testosterone were purchased from Steraloids (Wilton, NH, USA).
The suitability in terms of metabolic-competent hepatocyte cultures and in total CYP oxidative metabolism (7-ethoxycoumarin O-deethylation, total testosterone
The Nuclear Receptors in Metabolism page provides a portal to the pages discussing Type 2A: Hepatocyte Nuclear Factor-4 (HNF4) Receptors the androgen hormone, androsterone, derived via testosterone metabolism.
Hepatocytes as well as enterocytes were capable to metabolise ethoxyresorufin and ethoxycoumarin. With enterocyte cultures, the metabolism of testosterone
When CP hepatocyte suspensions were permeabilized (with digitonin) and incubated with NADPH and ATP, testosterone metabolism was significantly
For E. purpurea, testosterone metabolism showed a much lower CYP3A4 of the . activity of various hepatic drug-metabolizing enzymes in human hepatocyte
Major pathways for testosterone metabolism in the liver, including hydroxylation, . P4503A induction in primary cultures of rat, rabbit, and human hepatocytes.
These substrates have been previously applied in P450 metabolism and inhibition studies . Until recently, primary cultures of human hepatocytes were the major tools to . activation and inhibition of diazepam and testosterone metabolism.
The use of cryopreserved hepatocytes has increased in the last decade due to the Assessment of metabolic capacity using testosterone metabolism.
7 days. 10 days p m o l/m g p ro tein. 2D. Hi-Spot. 2D6 Metabolism. Bufuralol. Total Testosterone Metabolism in Human Hepatocytes. (Lot 91 August 21, 2006). 0
cultured hepatocytes from genetically distinct mouse strains are feasible, we aimed to . oxidative metabolism of α-hydroxytestosterone and glucuronidation of
In this work, ultra-high-viscosity alginate was used for hepatocyte . Testosterone is regio- and stereoselectively metabolized by CYPs to
In addition, SDD metabolism was investigated in hepatocytes from castrated male rats treated with testosterone, prior to liver cell isolation. In male rat
Production of Pregnenolone from Cholesterol and further metabolism 17- hydroxy progesterone and androstenedione, precursor to testosterone and estrone. to activate the Transient Receptor Potential M3 ion channel in hepatocytes and
Ethoxycoumarin and ethoxyresorufin O-deethylase activities were equivalent in fresh and CP hepatocytes. 4. The profile of testosterone metabolism was
Rat hepatocytes were cultured initially as spheroids on culture plates and .. The metabolism of testosterone is a useful assay to determine the
Cryopreserved human hepatocytes - Chemico-Biological Assessment of metabolic capacity using testosterone metabolism, Drug Metab.
Cryopreservation of viable hepatocyte monolayers in cryoprotectant media with high serum content: metabolism of testosterone and
P Department of Drug Metabolism and Phamamkinetics,. Inducibility by a number Testosterone 6p-hydroxylation in human hepatocytes after. 96hrs in culture.
The use of human hepatocyte cultures to study the induction of cytochrome testosterone 6beta-hydroxylase activity, amount of CYP3A protein, and total Induction of the metabolism of midazolam by rifampin in cultured porcine hepatocytes:
As the metabolic alterations coinciding with the availability of effective ART .. hepatocyte proliferation, intracellular lipids, and cyclooxygenase-2 levels. Effects of physiologic testosterone supplementation on fat mass and
Hepatic material: Individual CYP isoforms, S9, microsomes, hepatocytes. • Extra- hepatic material: skin and Interspecies variation in metabolic profiles ( qualitative or quantitative). Test systems Testosterone for CYP3A. • S- mephenytoine for
The key events involved in the disruption in testosterone homeostasis and an inhibitor of the mevalonate pathway that alters lipid metabolism, to assess
The determination of metabolite profile in liver microsomes or hepatocytes is designed to provide information regarding the metabolic fate of a test compound in
and testosterone metabolism are altered in cardiac . Metabolism of testosterone androstane receptor expression in human hepatocytes: conse- quences
The CYP3A drug metabolism activities of the hepatocytes were well maintained on assayed for CYP3A activity by testosterone 6-β-hydrox-. The procedures
Fipronil can inhibit testosterone metabolism by CYP3A4 and is an effective inducer of CYP isoforms in human hepatocytes. Copyright © 2008
The cultures may be used to produce hepatocyte products, evaluate metabolism of an agent, propagate Hepatitis C virus and test agents as
Skin metabolism is qualitatively different from liver metabolism (microsomes and hepatocytes). METABOLITE PROFILES OF [4, 14C]-TESTOSTERONE
Testosterone metabolites in methanol for standard curve (see recipe and Table . derivatives on cytochromes P450 from human hepatocytes in primary culture.
The seven hydroxylated metabolites of testosterone produced by cultured hepatocytes were negligible in hepatoma cells. Exposure of cells to inducers revealed
hepatocytes in primary culture, was to examine directly whether hormonal factors .. Testosterone metabolites were separated by thin layer chromatography and
important function of drug metabolism in hepatocytes. . show variations in testosterone metabolism (e.g. the Gunn rat strain CYP2C11 has a
metabolism. In both cultivated HepG2 hepatocytes and primary human monocyte -derived macrophages, testosterone led to a dose- dependent up-regulation of
4-Intracellular transport in hepatocytes. 5-Conjugation with glucuronic acid. 6- Secretion into bile ducts. 7- Intestinal metabolism. 8- Renal excretion of bilirubin
The use of both rat and human hepatocyte culture for the prediction of in . not inhibit the metabolism of testosterone to 6β-hydroxytestosterone
The activity of CYP3A4 was determined by measuring the testosterone metabolism in cultured hepatocytes as described by Kostrubsky et al.
extensive swollen hepatocytes, presence of enlarged nucleus and vacuolation of . Effect of AFB1 on liver microsomal testosterone metabolism. Microsomal
The formation of testosterone hydroxy (OHT) metabolites (namely 6b-OHT, 2b- CP monkey hepatocytes are a useful model for metabolic and cytotoxicity
B1 Metabolism in Human Hepatocytes in Primary Culture' . The 6f3- hydroxylationof testosterone catalyzed by CYP3A4 was tested by incubating microsomal
Enzyme Induction In Freshly Isolated Human Hepatocytes . other laboratory animals by immunochemical analysis and by analysis of testosterone metabolism .
Primary cultures of human hepatocytes. Wed, 24 Aug 2011 12:27:41 | Drug Metabolism. Primary cultures of human hepatocytes have been considered by most
Enzyme Induction in Rat Primary Hepatocytes.
These include the major phase I drug metabolism enzyme family (P450) and phase II enzymes (UGT, SULT, GST, and NAT). Hepatocytes also contain all the
Collagen coating improves the maintenance of hepatocytes on polymeric Testosterone metabolism was more extensive in cells cultured on collagen films than
SpringerImages - Multiple CYP isoform assay. Testosterone metabolism was studied in cultures of human hepatocytes as described in the section “”. C control, A
Auto-inhibition of verapamil metabolism in rat hepatocytes of gel entrapment by the formation rates of 6β-hydroxy testosterone and 1'-hydroxy midazolam.
1 Introduction; 2 Materials; 2.1 Liver Perfusion; 2.2 Hepatocyte Isolation . cytochrome P450 enzymes, a primary route of metabolism for many pharmaceuticals. . and Parkinson, A. (1987) Regulation of testosterone hydroxylation by rat liver
(1992) “ Regulation By Growth Hormone And Glucocorticoid Of Testosterone Metabolism In Long - Term Cultures Of Hepatocytes From Male
In the mouse hepatocyte cell line TAMH, FLU resulted in greater cytotoxicity than Due to low CYP activities in the TAMH cell line, metabolism and cytotoxicity
The viability and differentiated properties of the hepatocytes cultured in the HARV were as pentoxyresorufin-O-dealkylase and testosterone 16β-hydroxylase. Subjects: Hepatocytes - metabolism Cytochrome P-450 CYP2B1 - metabolism
cultures of rat hepatocytes, cultured on collagen films, gels and double gel cultures (sandwich configuration). The extent of testosterone metabolism, and the
Hepatocytes were treated with antiretroviral drugs at a concentration of 10Ug/ml once every day for 4 days. On day 4, the metabolism of testosterone (250UM),
CYPs are the major enzymes involved in drug metabolism and bioactivation, . breakdown (including estrogen and testosterone synthesis and metabolism),
Simultaneous Assessment of Uptake and Metabolism in Rat Hepatocytes: A .. Activation and Inhibition of Diazepam and testosterone metabolism. Drug Metab.
Primary porcine hepatocytes. Testosterone. Biotransformation. Albumin. Metabolites. CYP activity. Metabolism. a b s t r a c t. Interspecies difference is an
No differences in the metabolite profile of testosterone were found. a valuable source of human hepatocytes for drug metabolism studies.
Many drug-drug interactions are metabolism based and mediated primarily via Cryopreserved human hepatocyte cultures from three individual donors are used β-OH-testosterone, respectively) relative to vehicle control cells (un-induced).
Arsenic: metabolism and transport mechanisms in human hepatocytes. Arsenic: Cypermethrin exposure during puberty disrupts testosterone synthesis via
Contains details of Cryopreservation of rat and mouse hepatocytes II Assessment of metabolic capacity using testosterone metabolism.
metabolism activities of cultured human hepatocytes may significantly . rates of testosterone hydroxylation at different positions observed in
Human hepatocytes play several key roles in preclinical drug development . 10 shows the inducibility of testosterone metabolism after treating
observed interindividual variability in oxazaphosphorine metabolism. For example .. in CYP3A-catalyzed hepatocyte microsomal testosterone 6j3-hydrox
ences in metabolic abilities, fresh h-hepatocytes are a bet- ter model for predicting the toin, dextromethorphan, chlorzoxazone, testosterone, ketoprofen , and
TESTOSTERONE METABOLISM IN RAT HEPATOCYTES IN PURE CULTURE OR CO-CULTURED WITH MS CELLS °. Days of Culture. Activity. 0. 1. 3. 7. 15~-
Ketoconazole inhibited metabolism of testosterone with 40% .. and epithelial cells), metabolic activity was recalculated per mg hepatocyte or epithelial protein.
Metabolism. Ask the expert. Q. What are the benefits of using cryopreserved hepatocytes, and how does the activity of freshly isolated
specific substrate, such as the conversion of testosterone to 6ß- hydroxytestosterone by CYP3A. This method utilizes intact human hepatocytes for metabolic
testosterone in human hepatocytes treated with phthalates and Dex. As shown activity may lead to alterations in metabolism, resulting in deleterious drug-drug
Primary hepatocytes: Current understanding of the regulation of metabolic Progesterone and testosterone hydroxylation by cytochromes P450 2C19, 2C9 and
method can determine metabolic stability using microsomes or hepatocytes from any species. foxide (DMSO) and testosterone were purchased from Sigma
Testosterone metabolism in freshly isolated cultured and immortalized rat hepatocytes. 1995. The British Toxicology Society Joint BTS/IVTS Meeting. Oxford, UK.
In rat hepatocyte cultures CYP3A induction, as quantified by. 6ROH testosterone formation, was higher when cells were cultured in the absence of FCS.
testosterone metabolism by this protocol is also a very sensitive method to detect the inhibition of CYP3A4 by .. by chemicals of interest in human hepatocytes
Evidence for the presence of hepatocyte growth factor expression in human ovarianfollicles. Y Osuga, O Testosterone - metabolism [89 related records]
This invention relates to virally-immortalized hepatocyte cell lines, which 10 shows the inducibility of testosterone metabolism after treating
The mono- and diacylglycerides are metabolic intermediates in phospholipid Examples of steroid hormones are Testosterone and Progesterone, the male and . The cellular lipases of adipocytes and hepatocytes are under hormonal
Hepatic Metabolism. CYPs are found in the smooth endoplasmic reticulum (ER). Hepatocytes contain the full complement of the major DMEs including cytosolic
Title. Further characterization of autologous NeoHepatocytes for in vitro toxicity testing Bio-transformation rates, assessed by testosterone metabolism, were
assessed for stability in rat cryopreserved hepatocytes. this may be due to metabolic N-dealkylation of the amide side-chain, whilst the higher lipophilicity
Rifampicin induction of lidocaine metabolism in cultured human hepatocytes. . chloroxazone 6-hydroxylation, and testosterone 6b-hydroxylation. Chem. Biol.
The generation of functional hepatocytes independent of donor liver organs Importantly, iHep cells metabolized phenacetin, testosterone and
(1992) Vind et al. Biochemical Pharmacology. Read by researchers in: 100% Biological Sciences. The activities of 2-, 6 beta-, 7 alpha- and 16
by the formation rates of 6β-hydroxy testosterone and 1'-hydroxy midazolam.
Cryopreserved human hepatocytes are suitable for induction, inhi- bition These hepatocytes are ideal for metabolism studies. Testosterone 6β-hydroxylation
Activities of CYP3A (6-b-hydroxylation of testosterone). GST [substrate: .. hepatocytes should show metabolic activities similar to the in vivo situation [13, 45,
S9 fractions were collected from the hepatocytes and used for testosterone metabolism……………………………………………….…………………86
It regulates insulin metabolism and stimulates protein synthesis. There are two forms, Hepatocyte Growth Factor HGF is a Testosterone affects the nervous system, skeletal muscle, bone marrow, skin, hair and the sex organs. With skeletal
The gold standard in vitro model to assess induction is primary hepatocytes. . Liquid Chromatography Testosterone Metabolism Assay to Assess Changes in
van't Klooster et al., Cytochrome p450 induction and metabolism of alkoxyresorufins, ethylmorphine and testosterone in cultured hepatocytes from goats, sheep
Regulation of HepG2 cell apolipoprotein B metabolism by the citrus .. synthesis in human hepatoma cells: Mechanism of antagonism by testosterone. Proc.
ly (i.e. testosterone metabolism, ECOD activity) could be incorporated. 3. Hepatocytes should be isolated from adult rats, which may have been pre-treated
analyses of metabolic capacities of cryopreserved hepatocytes are often limited .. picin induced testosterone metabolism by 4.5-fold in fresh hepato- cytes but
testosterone (20 µM) and 7-Hydroxy 4-trifluoromethylcoumarin (HFC, 25 µM) as . metabolic clearance from in vitro intrinsic clearance data in hepatocytes and
The use of primary hepatocyte cultures as in vitro models for studying xenobiotic .. The metabolism of testosterone by the hepatocytes maintained in different
Does BD Biosciences use hepatocytes for in vitro metabolism and/or induction 4'-hydroxylase (CYP2C9), bufuralol 1'-hydroxylase (CYP2D6), testosterone
Similarly, decreased levels of 7-ethoxycoumarin O-deethylation and testosterone metabolism were observed in human hepatocyte cultures prepared from
The purpose of this research was to establish the metabolic pathway of endosulfan .. Testosterone metabolites detected with endosulfan-treated hepatocyte S9
Hepatocyte growth factor (HGF) is a key regulator of satellite cell activity. Growth hormone helps to trigger fat metabolism for energy use in the muscle growth In addition, testosterone can increase the presence of neurotransmitters at the
hepatocytes, individual cryopreserved hepatocytes, or pre-pooled cryopreserved hepatocytes in the metabolism of high, moderate and low cleared compounds
of the testosterone metabolites measured in the presence of either ion,
Collagen coating improves the maintenance of hepatocytes on polymeric Testosterone metabolism was more extensive in cells cultured on
The inhibition of formation of resorufin and 6β-hydroxytestosterone by 3- indoxylsulfate was also observed in human hepatocytes. The elimination of nicardipine
Screening service for hepatocyte metabolic stability - assay protocol, data and the metabolic stability of ethoxycoumarin, 7-hydroxycoumarin, and testosterone
Protein metabolism (e.g. conversion of reporter compound to fluorescent product by hepatocyte cells) has also been .. Testosterone Metabolism by Fa2N4
The UK Human Tissue Bank provides fresh hepatocytes - plated or in suspension and characterisaed crypreserved hepatocytes for metabolism or induction are assayed for induction with Ethoxyresorufin (BNF) and Testosterone (RIF).
Accurate and reproducible drug metabolism studies with SOVICYTE Human Cryopreserved Hepatocytes. Hepatocytes are provided to assess a drug candidate's metabolic stability, profile enzymes 3A4, Testosterone 6β- hydroxylation
receptor in preneoplastic hepatocytes, or by an indirect mech- anism, we chronically .. assay and testosterone is rapidly metabolized and excreted. (33). Also
fresh and CP hepatocytes. 4. The pro®le of testosterone metabolism was unaåected by freezing. Total hydroxylase activities were 815‰33 pmol} min} 10' cells
(1997) examined the metabolism of testosterone in rat and human hepatocytes and found that most of the in vivo metabolites were also
Cytochrome P450 metabolism can vary widely from one species to another, can be assessed by studying the in vitro metabolism of a drug by hepatocytes from a a comparison of alfentanil N-dealkylation and testosterone 6β- hydroxylation
those in the wild-type liver and in primary mouse hepatocytes. 3. Analysis of basal CYP activities and testosterone metabolism revealed that ∆202 cells showed
Phase I metabolism. Cellular system destroyed. Lack of cofactors. Limited Phase II metabolism. No active transport. Product inhibition. Hepatocytes. Pro:
By treating the hepatocytes with an inducer or inhibitor of metabolism by the . testosterone to 6β-OH testosterone was measured via HPLC to confirm. CYP3A4
Determination of testosterone metabolites in human hepatocytes. I. Development of an on-line sample preparation liquid chromatography
Understand the metabolism of your compounds by using our S9 stability are predominantly focused on using hepatocytes or subcellular hepatic dependence of midazolam and testosterone on Phase I metabolism prior to
Table 1 Testosterone metabolism in rat hepatocytes, B-13 cells and B-13/H cells. Results are the means±S.D. of the rate of metabolite production from three
Key words: long-term culture, hepatocytes, drug metabolism, enzyme regulation, induction In pure cultures, testosterone metabolism was drastically reduced.
21. Swales NJ, Johnson T, Caldwell J. Cryopreservation of rat and mouse hepatocytes. II Assessment of metabolic capacity using testosterone metabolism.
Effects of green tea compounds on irinotecan metabolism However, the production of 6beta-hydroxytestosterone remained unaffected in other hepatocyte
5.3.4 Assay of Testosterone. . cytochrome P450 ( CYP) forms have a major role in the metabolism of drugs and other chemicals.
The rate of metabolism of testosterone was generally lower in microsomes than hepatocytes, with the exception of the ox, but the pattern and
Determination of testosterone metabolites in human hepatocytes. I. Development of an on-line sample preparation liquid chromatography technique and mass
Rat hepatocytes in primary culture can be stimulated to replicate under the Estrogen, testosterone, tryptophan, and vitamin E inhibited DNA synthesis by Several carcinogens requiring metabolic activation as well as the
Preserved, Non-Frozen Hepatocytes as a Robust and Convenient System for in vitro II metabolism and poor plating efficiency. 6β-OH Testosterone. 72.8
The activity of CYP3A4 was determined by measuring the testosterone metabolism in cultured hepatocytes as described by Kostrubsky et al.,
metabolites of testosterone in the aetiology of hepatocellular carcinoma (HCC) is . The characterization of bile acid synthesis by cultured hamster hepatocytes
RESULTS: The pattern of specific cytochrome P450 activities and the metabolic profile of testosterone in intact hepatocytes were essentially the same as those
Hepatocyte-1. Vitronectin e. Dil-ac-LDL. TTF+GFP. iHep. PA. S g f h. 1/8 1/4 1/2. 2 . 4. 8. 1. ICG i. Phenacetin metabolism. 0. 1. 2. 3. Testosterone metabolism. 0. 1
hepatoma cell lines at similar levels to those found in hepatocytes (684 ? 56 nmol /mg X min). The seven hydroxylated metabolites of testosterone produced by
Cryopreservation of viable hepatocyte monolayers in cryoprotectant media with content: metabolism of testosterone and kaempherol post-cryopreservation.
Testosterone metabolism and EROD activity on cultured hepatocytes were conducted as described by Kostrubsky, et al.40 and Wen et al.41,
hepatocytes in rat following PH . When the serum testosterone concentration is 2 - 3 times of the physiological level, it facilitates transcriptional activity; while
The uptake and efflux of a drug into and from hepatocytes can determine the rate at which the molecule is metabolized and eliminated from the body. CYP3A4/5 Testosterone 6β-hydroxylation; UGT Glucronidation of Methylumbelliferone
CYP3A4 testosterone to 6 beta- testosterone conversion activity of C3A human hepatocyte cell line · Increased cytochrome
Human hepatocytes are being used in a broad range of in vitro studies including drug metabolism, drug-drug interaction, and cytotoxicity.
Uremic substances Metabolism Microsomes. Hepatocytes Pharmacokinetics 3- Indoxylsulfate. 3-Indoleacetic acid Nicardipine Testosterone to
that significant amounts of testosterone metabolites were retained within the enterocytes is estimated to be 1.7 to 2.9 times higher than that in hepatocytes.
TESTOSTERONE METABOLISM IN RAT HEPATOCYTES IN PURE CULTURE OR . quantitative comparison of testosterone metabolism in hepatocytes in pure
Keywords: Hepatocytes; tissue engineering; p450; transcription factors; testosterone metabolism; RT-PCR; nuclear receptors; induction;
iCell Hepatocytes will provide, for the first time, access to commercial quantities of high activity (metabolism of testosterone substrate) was assayed by mass
Overall, the metabolic activity of CYP3A5 was less than that of CYP3A4. Ketoconazole Oxidized nifedipine formation was inhibited by testosterone in rCYP3A4. However, in In Vitro Models: Hepatocytes & Microsomes
Regulation by growth hormone and glucocorticoid of testosterone metabolism in long-term cultures of hepatocytes from male and female rats. Constance Vind
hepatocytes in vitro and concomitantly preserving their differentiated hepatic functions was analyzed. . Determination of testosterone metabolites.
It is structurally similar to steroids such as testosterone, cholesterol, and cortisol ( though Hydroxylation in the endoplasmic reticulum of liver hepatocytes of Although cholecalciferol can be synthesized in the skin (see Metabolism), it is also
the metabolism of around 70 % of therapeutic drugs and endogenous METHODS: Hepatocytes were isolated from liver specimens from hepatic angioma patients . conversion of testosterone to 6-hydroxytestosterone or N- demethylation of
Hepatocyte functions were evaluated by testosterone metabolism and transportation of tritiated- taurocholic acid and carboxy-dichlorofluorescein diacetate
Testosterone 6β-hydroxylation. Suspensions. Fresh suspended human hepatocytes are useful for short- term drug metabolism studies and are also suitable for
Hepatocyte growth factor (HGF) regulates many cellular functions that HGF significantly increases the amount of testosterone secreted by the
Testosterone Metabolism Profiles by Primary Human Hepatocytes. The oxidative metabolism of testosterone was analyzed to estimate drug-metabolizing
Determination of testosterone metabolites in rat hepatocytes with and without cryopreservation by on-line SPE column-switching LC and MS detection.
The metabolic functionality of the isolated hepatocytes was assayed by measuring total CYP450 content, testosterone hydroxylation, EROD,
Most people associate testosterone with facial hair, gigantic muscles & illegal their effect on cholesterol metabolism in HepG2 hepatocytes.
Induction potential will be investigated using human hepatocytes and the the project to be a potent inhibitor of testosterone metabolism in humans as well as
Overview; Metabolism of Drugs; Clinical and Pathological . Apoptosis of hepatocytes: Activation of the apoptotic pathways by the tumor necrosis . reaction include anabolic steroids (eg, methyl testosterone, oxymetholone,
Human hepatocytes with at least one CYP3A5*1 allele also metabolized vincristine, albeit at a slower rate (10-fold) .. Vincristine and Testosterone Incubations.
The oxidative metabolism of testosterone was analysed as an additional parameter to estimate the drug-metabolising capacity of cells. Human hepatocytes
metabolic stability /2 time-Points (microsomes, s9, hepatocytes) metabolic stability (liver . cyP3a4 inhibition (recombinant, testosterone substrate). 0940
“Dexamethasone metabolism by human liver in vitro, metabolite .. ethylmorphine and testosterone in cultured hepatocytes from goats, sheep and cattle.
Alcohol is directly toxic to the testes; causing reduced testosterone levels.The present study was metabolism, liver cirrhosis and hormonal changes associated
Publication » Cytochrome P450 induction and metabolism of alkoxyresorufins, ethylmorphine and testosterone in cultured hepatocytes from goats, sheep and
Prediction of metabolic clearance using fresh human hepatocytes: Comparison with The effect of heteroactivation by testosterone in human liver microsomes.
described in detail previously [16]. Testosterone hydro- xylation was measured in intact hepatocytes incubated for 30min with 250 mM testosterone. Metabolites
Heteroactivation by testosterone of the metabolism of benzodiazepines has been demonstrated in microsomes (Rawden et al. 2001), cryopreserved hepatocytes
The primary site of metabolism for many drugs is the liver. Liver-derived systems such as liver slices, sub-cellular liver fractions, and intact hepatocytes are
After incubation of bovine hepatocytes with methyltestosterone for 24 h, culture Media, Conditioned/metabolism; Gas Chromatography-Mass Spectrometry
progesterone and testosterone) o Other receptors and molecular targets. (n:1.24) o Metabolism in human and rat hepatocytes o Inhibition of P450 enzymes
The lower rate of metabolism in slices compared with hepatocytes confirms our previous observations using testosterone, 7-ethoxycoumarin, 1-chloro-2
metabolites of xenobiotics produced by mixed-function oxygenases .. Treatment of co-cultured hepatocytes with testosterone or with 5α-DHT had no significant
Species Differences in the Metabolism of Benzo(A)Pyrene and Testosterone by Isolated Hepatocytes. Date: 11 Sep 1988 (est.) Length: 1 page 2028900635
16α‐OHT was present in all incubations except for ox microsomes. The rate of metabolism of testosterone was generally lower in microsomes than hepatocytes,
Analysis of basal CYP activities and testosterone metabolism revealed that Delta 202 cells showed higher similarities to mouse hepatocytes than Hepa 1c1c7
Overall clearance to metabolites was significantly greater in hepatocytes for testosterone (1.9- to 16.9-fold), 7-ethoxycoumarin (O-deethylation, 14.8-fold;
the testosterone metabolism in cultured hepatocytes as described by. Kostrubsky et al. (17). Cells were then scraped from the plates and proteins analyzed on
Assessment of metabolic capacity using testosterone metabolism. Metabolic activity of fresh and cryopreserved dog hepatocyte suspensions. Cryopreservation
also testosterone metabolism is inducible by phenobarbitone and dexamethasone (Walker et al., 1999). Hepatocytes in spheroids also retain their ability to
It has been established that unsaturated fats suppress the metabolic rate, " Effects of magnesium and iron on lipid peroxidation in cultured hepatocytes," Mol. .. -EPA and DHA inhibited gonadotropin-stimulated testosterone production in a
The activity of CYP3A4 was determined by measuring the testosterone metabolism in cultured hepatocytes treated with vehicle (defined as basal controls) or
active in the metabolism of xenobiotics with CYP 3A subfamilies being the most animals, strongly inhibited the hydroxylation rate of testosterone at the 6 beta position via mediate complex in both microsomes and hepatocytes. This report
Cryopreserved hepatocytes represent the current “state of the art” model system for studying xenobiotic metabolism and drug-drug interaction potential.
Testosterone metabolism of non-cryopreserved (control) and cryopreserved (bold ) rat hepatocyte monolayer cultures treated with FCS90, FCS70, FCS05, and
Cryopreserved human hepatocytes represent a convenient and biologically relevant model to mitigate this a pool of cryopreserved human hepatocytes as a model for drug metabolism studies. . Hepatocytes. *Testosterone 6β- hydroxylation
Drug Metabolism in Hepatocyte Sandwich Cultures. 767. FIG. 5. Testosterone hydroxylation and formation of androstenedione (A) in primary cultures of human
Examination of testosterone metabolism in hepatocyte cultures revealed that DMSO pretreatment increased CYP3A-catalyzed 2beta- and
Pradefovir (1.63, 4.08, 16.3, or 40.8 μM) or testosterone (50 μM) was also incubated with . Enzyme induction study with primary cultures of human hepatocytes.
Walsky and Obach, Drug Metabolism and Disposition, 2004; 32: 647-660. CYTOCHROME P450 INHIBITION CYP 3A4. (i) Testosterone. 6-β-OH- Testosterone
Hepatocyte specific function assays, namely albumin secretion, urea secretion, testosterone metabolism by HPLC and CYP activities by LC-MS-MS, were used
Testosterone metabolism in freshly isolated cultured and immortalized rat hepatocytes. The British Toxicology Society Joint BTS/IVTS Meeting. Oxford, UK. P38.
Four samples were unsuitable to prepare hepatocytes. The profile of testosterone metabolism as 6.BETA.-, 2.BETA.-, 16.BETA.-, 16.ALPHA.- and 2.ALPHA.
hepatocytes, are responsible for this phenomenon. (152). A low protein diet may . Testosterone metabolism can be increased via hepatic enzyme induction by
Determination of testosterone metabolites in human hepatocytes: I. Development of an on-line sample preparation liquid chromatography technique and mass
rat hepatocytes for use in metabolism and toxicity studies are used and
The aim of this investigation was to define the in vitro conditions necessary to support cytochrome P450-mediated metabolism in rat cultured hepatocytes, such
functionality of isolated hepatocytes and liver slices prepared either from healthy metabolism was studied using lidocaine and testosterone as sub- strates
Rifampin significantly increased testosterone metabolism in human hepatocytes. Treprostinil however, did not increase the metabolism of testosterone,
In human cultures, metabolism of testosterone to four different hydroxy metabolites is reduced by up to 90% in human hepatocytes after 2 days in co- culture or
This is well illustrated by the comparison of the metabolic profile of testosterone hydroxylated metabolites in cultured hepatocytes and liver microsomes,
Testosterone metabolism and formation of cytosol Study on the role of glutathione in the biotransformation and toxicity of furazolidone using pig hepatocytes.
vessels and perivenous hepatocytes around the efferent that a metabolic heterogeneity between hepatocytes .. Interaction of estrogen, testosterone
Thioredoxin and thioredoxin reductase can regulate cell metabolism through amounts in muscle and converts testosterone to dihydrotestosterone (DHT).
metabolism is that, as a cellular system, hepatocytes contain many enzymes and enzyme Assessment of metabolic capacity using testosterone metabolism.
Unger J. , Catapano G. , Lakhal M. , Gerlach J. , Rossaint R. , " Testosterone Metabolism of Primary Pig Hepatocytes Standard Mnonlayer Versus Medium
These first examples are from the testosterone target drug. Here we Differentiation of Xenobiotic Metabolism between Fresh and Cryo-preserved Hepatocytes
(B) ALT released from different microencapsulated hepatocytes at various time points. (C) Differences in testosterone metabolism among
Primary hepatocytes cultured as monolayers or as spheroids were studied to compare the also testosterone metabolism is inducible by phenobarbitone and
Phase 2 enzymes.4 CYP3A activity was measured by the metabolism of testosterone to. 6β-hydroxytestosterone. As shown in Figure 1A, mouse hepatocytes
Primary hepatocytes cultured as monolayers or as spheroids were studied Testosterone metabolism initially decreases in spheroids, but then
the metabolic capacity of fresh and CP rat and mouse hepatocytes in primary cufture. Total cytochrome. P450 (P450) con- tents and metabolism of testosterone
production we also investigated the metabolic compe- tence of porcine and human hepatocyte cultures based on their ability to metabolize testosterone. Further
A toxicogenomic approach applied to hepatocyte cultures enabled .. 4A and 4C ) and significantly reduced metabolism of testosterone with
ratios of testosterone metabolites did not change on cryopreservation. 4. hepatocytes, the slicing technique is suitable for practically all mammalian livers
The human hepatocytes were characterized for both testosterone-6β- hydroxylation for CYP3A4,
Cryopreserved hepatocytes were rapidly dissolved at 37 ℃ in culture medium. of testosterone and phenacetin were determined by HPLC and metabolic rate
Addition of T3 to primary hepatocytes resulted in a marked reduction of . Testosterone metabolites were separated by thin layer
Use of human hepatocytes to study drug metabolism and drug transport . . 13 Effect of silybin on testosterone metabolism in human hepatocytes.
Cryopreservation of viable hepatocyte monolayers in cryoprotectant media with high metabolism of testosterone and kaempherol post-cryopreservation (2004)
Liver slices and hepatocytes from cynomolgus monkey liver showed comparable metabolic rates for the substrates tested, indicating that all
Keywords: Tissue engineering, foams, rat hepatocytes, lactose, heparin, testosterone metabolism Received 2 November 1994; accepted 22 May 1995 The
We present a technique with cryopreserved hepatocytes that allows the induction of testosterone metabolism with similar induction factors as for fresh cultures.
Metabolic stability of compound determined in cryopreserved hepatocytes from Standard compounds testosterone, midazolam, and 4-methylumbelliferone are
human hepatocytes as an experimental system for drug metabolism studies. . result of the stimulatory influence of testosterone and the suppressive effect of
REVIEW ON CRYOPRESERVED HEPATOCYTES. 83 allows the induction of testosterone metabolism with similar induction factors as for fresh cultures.
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