scholarly journals Bile acids from bile of rats of different sexes under testosterone

2018 ◽  
Vol 9 (3) ◽  
pp. 396-400
Author(s):  
І. S. Chernuha ◽  
Y. М. Reshetnik ◽  
A. M. Liashevych ◽  
S. P. Veselsky ◽  
M. Y. Makarchuk
Keyword(s):  
Bile Acid ◽  
Bile Acids ◽  
Testosterone Propionate ◽  
Female Rats ◽  
Male Rats ◽  
Productive Capacity ◽  
Acid Biosynthesis ◽  
Enzyme Systems ◽  
Almost All ◽  
Layer Chromatography

Among the various functions of the liver, the formation of bile plays an important role. The optimal physiological ratio of bile components and the content of testosterone in the blood depend on various factors that can cause biliary system dysfunction and secretion. In experiments on different-sex rats, changes in bile acid contents of bile under the influence of testosterone propionate, which was injected intramuscularly 0.7 mg/kg, for 5 days were investigated. With the method of thin-layer chromatography, the basic fractions of bile acids conjugated in the bile were defined – taurocholic, taurochenodeoxycholic and taurodeoxycholic, glycocholic, glycochenodeoxycholic and glycodeoxycholic and free – cholic, chenodeoxycholic and deoxycholic acids. Conjugation rates were calculated (the ratio of the sum of conjugated cholates to the amount of free ones) and hydroxylation (ratio of the sum of trihydroxycholate bile acids to the sum of dihydroxycholanic) bile acids. In the bile of female rats almost all concentrations of cholates increased, except glycochenodeoxycholic and glycodeoxycholic acids. The calculated conjugation index on the whole did not undergo significant changes, but the hydroxylation factor increased, which may indicate an intensification of bile acid biosynthesis by neutral means, which is realized by 7α-hydroxylation of cholesterol. Under the influence of the hormone in male rats, the content of conjugated bile acids increased, and as for the free ones – a multidirectional effect of testosterone is observed, in particular, the concentration of cholic acid significantly decreased, indicating the activation of the poly-enzyme systems providing its conjugation with glycine and taurine. In connection with the wide use of the drug testosterone propionate and in view of its identified effects on the bile acid contents of the course of intramuscular administration, it is advisable to investigate the effect of this drug on the productive capacity of the liver.

scholarly journals Different mechanisms of regulation of nuclear reduced nicotinamide–adenine dinucleotide phosphate-dependent 3-oxo steroid 5α-reductase activity in rat liver, kidney and prostate

1974 ◽  
Vol 142 (2) ◽  
pp. 273-277 ◽  
Author(s):  
Jan-Åke Gustafsson ◽  
Åke Pousette
Keyword(s):  
Testosterone Propionate ◽  
Reductase Activity ◽  
Nicotinamide Adenine Dinucleotide Phosphate ◽  
Female Rats ◽  
Male Rats ◽  
Regulatory Mechanisms ◽  
Oestradiol Benzoate ◽  
Liver And Kidney ◽  
Reduced Nicotinamide Adenine Dinucleotide ◽  
Hydroxy Steroid

The regulatory mechanisms involved in the control of the nuclear NADPH-dependent 3-ketosteroid 5α-reductase (5α-reductase) activity were studied in liver, kidney and prostate. The substrate used was [1,2-3H]androst-4-ene-3,17-dione (androstenedione) (for liver and kidney) or [4-14C]androstenedione (for prostate). The hepatic nuclear 5α-reductase activity was greater in female than in male rats, was greater in adult than in prepubertal female rats, increased after castration of male rats, but was not affected by treatment with testosterone propionate or oestradiol benzoate. These regulatory characteristics are in part different from those previously described for the hepatic microsomal 5α-reductase. The renal nuclear metabolism of androstenedione, i.e. 5α reduction and 17β-hydroxy steroid reduction, was relatively unaffected by sex, age, castration and treatment with testosterone propionate. However, treatment of castrated male rats with oestradiol benzoate led to a significant increase in the 5α-reductase activity and a significant decrease in the 17β-hydroxy steroid reductase activity. Finally, the nuclear 5α-reductase activity in prostate was androgen-dependent, decreasing after castration and increasing after treatment with testosterone propionate. In conclusion, the nuclear 5α-reductase activities in liver, kidney and prostate seem to be under the control of distinctly different regulatory mechanisms. The hypothesis is presented that whereas the prostatic nuclear 5α-reductase participates in the formation of a physiologically active androgen, 5α-dihydrotestosterone, this may not be the true function of the nuclear 5α-reductase in liver and kidney. These enzymes might rather serve to protect the androgen target sites in the chromatin from active androgens (e.g. testosterone) by transforming them into less active androgens (e.g. 5α-androstane-3,17-dione and/or 5α-dihydrotestosterone).

Androgens and estrogens affect hepatic bile acid sulfotransferase in male rats

1985 ◽  
Vol 248 (6) ◽  
pp. G639-G642 ◽  
Author(s):  
R. B. Kirkpatrick ◽  
N. M. Wildermann ◽  
P. G. Killenberg
Keyword(s):  
Bile Acid ◽  
Chemical Structure ◽  
Specific Activity ◽  
Estrogen Treatment ◽  
Female Rats ◽  
Male Rats ◽  
Hepatic Bile ◽  
Similar Treatment ◽  
Untreated Female ◽  
Varied Chemical

The effect of estrogens and androgens on hepatic glycolithocholate sulfotransferase activity was studied in male rats. Significant increases in specific activity were noted following treatment of rats for 21 days with 17 beta-estradiol, 17 alpha-ethynylestradiol, and the nonsteroidal estrogen agonists nafoxidine, tamoxifen, and diethylstilbestrol. Similar treatment of male rats with 5 alpha-dihydrotestosterone, hydrocortisone, norethindrone, and prolactin did not affect activity. To further assess the effect of androgens, male rats were castrated. Glycolithocholate sulfotransferase activity increased fivefold by 14 days after castration. Treatment of castrated rats with 5 alpha-dihydrotestosterone prevented the increase and maintained activity at the level of sham-operated animals. Castrated animals exhibited an additional increment in activity following treatment with 17 alpha-ethynylestradiol: specific activity in these animals rose to levels comparable with those measured in untreated female rats. These data suggest endogenous androgens maximally suppress hepatic glycolithocholate sulfotransferase activity in male rats. The data also indicate that activity is stimulated by estrogenic compounds of varied chemical structure and that stimulation is not solely due to suppression of androgen release by the testes as a consequence of estrogen treatment.

EFFECTS OF TESTOSTERONE MEDIATED OR MODULATED BY PITUITARY FACTORS

1975 ◽  
Vol 67 (1) ◽  
pp. 71-79 ◽  
Author(s):  
P. DE MOOR ◽  
M. ADAM-HEYLEN ◽  
H. VAN BAELEN ◽  
G. VERHOEVEN
Keyword(s):  
Body Weight ◽  
Testosterone Propionate ◽  
Total Body Weight ◽  
Seminal Vesicles ◽  
Female Rats ◽  
Male Rats ◽  
Intact Male ◽  
Adult Rats ◽  
Organ Weights ◽  
Total Body

SUMMARY Adult rats of both sexes were either gonadectomized or hypophysectomized and gonadectomized. Three to eight weeks later they were treated for 14 consecutive days with oil or with 75 or 200 μg testosterone propionate (TP) per 100 g body weight. The animals were killed and for each sex the gonadectomized animals were compared with the hypophysectomized-gonadectomized animals as far as their NADPH- and NADH-dependent 3α-hydroxysteroid dehydrogenases (3α-HSD) in renal microsomes, transcortin levels in serum and five organ weights relative to total body weight were concerned. For two of the latter, i.e. the relative kidney and prostatic weights, no significant differences were found. Transcortin levels, relative adrenal weights and renal NADPH-dependent 3α-HSD activities were higher in oil-treated gonadectomized animals than in oil-treated hypophysectomized-gonadectomized animals. The opposite was found for the relative weights of uterus and seminal vesicles and renal NADH-dependent 3α-HSD activities. These differences between gonadectomized and hypophysectomized-gonadectomized animals disappeared after TP treatment as far as transcortin levels were concerned but remained for the five other parameters. After gonadectomy sexual differences subsisted for all parameters studied. But whereas intact male rats had higher NADH-dependent 3α-HSD activities than female rats the opposite was found after gonadectomy. After gonadectomy plus hypophysectomy the between sex differences disappeared as far as transcortin levels were concerned but remained in the other parameters studied.

Transcriptional regulation of hepatic sterol 27-hydroxylase by bile acids

1996 ◽  
Vol 270 (4) ◽  
pp. G646-G652 ◽  
Author(s):  
Z. R. Vlahcevic ◽  
S. K. Jairath ◽  
D. M. Heuman ◽  
R. T. Stravitz ◽  
P. B. Hylemon ◽  
...  
Keyword(s):  
Bile Acid ◽  
Bile Acids ◽  
Specific Activity ◽  
Feedback Regulation ◽  
Initial Step ◽  
Mrna Levels ◽  
Acid Biosynthesis ◽  
Negative Feedback Regulation ◽  
Study Objective ◽  
Specific Activities

The study objective was to determine whether and to what extent sterol 27-hydroxylase, the initial step in the "acidic" pathway of bile acid biosynthesis, is regulated by bile acids. Rats were fed diets supplemented with cholestyramine (CT, 5%), cholate (CA, 1%), chenodeoxycholate (CDCA, 1%), or deoxycholate (DCA, 0.25%). When compared with paired controls, sterol 27-hydroxylase and cholesterol 7 alpha-hydroxylase specific activities increased after CT administration by 188 +/- 20% (P < 0.05) and 415 +/- 36% (P < 0.01), respectively. Similarly, mRNA levels increased by 159 +/- 14% (P < 0.05) and 311 +/- 106% (P < 0.05), respectively. Feeding CA, CDCA, or DCA decreased sterol 27-hydroxylase specific activity to 57 +/- 6, 61 +/- 8, and 74 +/- 8% of controls, respectively (P < 0.05). By comparison, the specific activity of cholesterol 7 alpha-hydroxylase decreased to 46 +/- 7 , 32 +/- 10, and 26 +/- 8% (P = 0.001). mRNA levels and transcriptional activities for sterol 27-hydroxylase and cholesterol 7 alpha-hydroxylase transcriptional activity were changed to the same extent as the specific activities after CT or bile acid feeding. We conclude that sterol 27-hydroxylase and cholesterol 7 alpha-hydroxylase are subject to negative feedback regulation by hydrophobic bile acids at the level of transcription. However, the responses of sterol 27-hydroxylase to manipulation of the bile acid pool are less prominent than those of cholesterol 7 alpha-hydroxylase. During the diurnal cycle the specific activities of sterol 27-hydroxylase and cholesterol 7 alpha-hydroxylase changed in tandem, suggesting that both may be under control of glucocorticoids.

INFLUENCE OF SEX HORMONES ON AMIDINOTRANSFERASE LEVELS. METABOLIC CONTROL OF CREATINE BIOSYNTHESIS

1966 ◽  
Vol 53 (4) ◽  
pp. 655-662 ◽  
Author(s):  
István Kriskó ◽  
James B. Walker
Keyword(s):  
Testosterone Propionate ◽  
De Novo ◽  
Specific Activity ◽  
Hormonal Control ◽  
Mature Male ◽  
Female Rats ◽  
Male Rats ◽  
Enzyme Protein ◽  
Wet Weight ◽  
Mammalian Enzyme

ABSTRACT Arginine: glycine amidinotransferase is the first of two enzymes involved in creatine biosynthesis. The amidinotransferase specific activity (micromoles of hydroxyguanidine formed per hour per g wet weight of tissue) of kidney homogenates of mature male rats was about twice that of females of the same age, whereas activities were equal before puberty. Castration decreased the activity of males and increased that of females. The administration of testosterone propionate to young adult female rats resulted in a significant increase in enzyme activity. The same enzyme had previously been shown to be repressible by its end-product, creatine. Although there are numerous enzymes whose synthesis is known to be under hormonal control, amidinotransferase is the only mammalian enzyme described up to now on which there appears to operate both an end-product repression mechanism and a hormonal control on the de novo synthesis of the enzyme protein.

PREVENTION OF CENTRAL DEFEMINIZATION BUT NOT MASCULINIZATION IN MALE RATS BY INHIBITION NEONATALLY OF OESTROGEN BIOSYNTHESIS

1977 ◽  
Vol 74 (3) ◽  
pp. 375-382 ◽  
Author(s):  
J. T. M. VREEBURG ◽  
PAULA D. M. VAN DER VAART ◽  
P. VAN DER SCHOOT
Keyword(s):  
Sexual Function ◽  
Ovarian Function ◽  
Testosterone Propionate ◽  
Neonatal Period ◽  
Female Rats ◽  
Male Rats ◽  
Normal Male ◽  
Male And Female ◽  
Male And Female Rats ◽  
Copulatory Behaviour

SUMMARY An inhibitor of aromatization, androsta-1,4,6-triene-3,17-dione (ATD), was administered to newborn male and female rats and various parameters of gonadal and sexual function were examined in adulthood. Males injected with 1 mg ATD on the day of birth (day 1) and on days 3, 5, 10 and 15 postnatally, subsequently (day 55) showed normal male and female copulatory behaviour, but were not able to maintain cyclicity in ovarian transplants. When the ATD was administered by Silastic implants, however, cyclicity in ovarian transplants did occur. Neither form of treatment brought about significant changes in neonatal plasma or testicular testosterone concentrations. Female rats implanted on day 3 of life with Silastic capsules containing ATD and then given an injection of 0·25 mg testosterone propionate on day 5 subsequently showed normal ovarian function, whereas the controls receiving only testosterone propionate showed persistent vaginal cornification, anovulation and polyfollicular ovaries. The results support the view that the central conversion of testicular androgens to oestrogens during the neonatal period is necessary to abolish cyclic gonadotrophin release and to suppress female copulatory behaviour.

EFFECT OF ADRENALECTOMY ON BILE ACIDS IN RATS

1964 ◽  
Vol 46 (3) ◽  
pp. 405-408 ◽  
Author(s):  
Antti Telkkä ◽  
Toini Lahikainen ◽  
A. N. Kuusisto
Keyword(s):  
Bile Acid ◽  
Thin Layer ◽  
Bile Acids ◽  
Thin Layer Chromatography ◽  
Acid Concentration ◽  
Taurocholic Acid ◽  
Ductus Choledochus ◽  
Layer Chromatography

ABSTRACT The effect of adrenalectomy on taurocholic acid, the main bile acid of the rat, was studied. The bile was obtained by cannulation from the ductus choledochus. The concentration of taurocholic acid in the bile was determined using thin-layer chromatography. The taurocholic acid concentration in the bile of the adrenalectomized animals was significantly decreased, being about a half that of the control rats. The results are briefly discussed.

scholarly journals Antagonism of the Actions of Peroxisome Proliferator-activated Receptor-α by Bile Acids

2001 ◽  
Vol 276 (50) ◽  
pp. 47154-47162 ◽  
Author(s):  
Christopher J. Sinal ◽  
Michung Yoon ◽  
Frank J. Gonzalez
Keyword(s):  
Fatty Acid ◽  
Bile Acid ◽  
Bile Acids ◽  
The Body ◽  
Peroxisome Proliferator ◽  
Acid Biosynthesis ◽  
Peroxisome Proliferator Activated Receptor ◽  
Bile Acid Biosynthesis ◽  
Genes Encoding ◽  
The Impact

The peroxisome proliferator-activated receptor-α (PPARα) is a ligand-activated transcription factor that regulates the expression of a number of genes critical for fatty acid β-oxidation. Because a number of substrates and intermediates of this metabolic pathway serve as ligand activators of this receptor, homeostatic control of fatty acid metabolism is achieved. Evidence also exists for PPARα-dependent regulation of genes encoding critical enzymes of bile acid biosynthesis. To determine whether the primary products of bile acid biosynthesis, cholic acid and chenodeoxycholic acid, were capable of modulating PPARα function, a variety ofin vivoandin vitroapproaches were utilized. Feeding a bile acid-enriched diet significantly reduced the degree of hepatomegaly and induction of target genes encoding enzymes of fatty acid β-oxidation caused by treatment with the potent PPARα ligand Wyeth-14,643. Convergent data from mechanistic studies indicate that bile acids interfere with transactivation by PPARα at least in part by impairing the recruitment of transcriptional coactivators. The results of this study provide the first evidence in favor of the existence of compounds, normally found within the body, that are capable of antagonizing the physiological actions of PPARα. The impact of PPARα antagonism by endogenous bile acids is likely to be limited under normal conditions and to have only minimal effects on bile acid homeostasis. However, during certain pathophysiological states where intracellular bile acid concentrations are elevated, meaningful effects on PPARα-dependent target gene regulation are possible.

scholarly journals The effects of testosterone and testosterone propionate on adult male rats (compared with those on female rats)

1937 ◽  
Vol 31 (8) ◽  
pp. 1434-1437 ◽  
Author(s):  
Vladimir Korenchevsky ◽  
Marjorie Dennison ◽  
Kathleen Hall
Keyword(s):  
Adult Male ◽  
Testosterone Propionate ◽  
Female Rats ◽  
Male Rats

scholarly journals A Simplified Procedure for the Isolation of Bile Acids from Serum Based on a Batch Extraction with the Non-Ionic Resin—Amberlite XAD-7

1977 ◽  
Vol 14 (1-6) ◽  
pp. 235-239 ◽  
Author(s):  
S. Barnes ◽  
A. Chitranukroh
Keyword(s):  
Liquid Chromatography ◽  
Bile Acid ◽  
Thin Layer ◽  
Bile Acids ◽  
Thin Layer Chromatography ◽  
Hydroxysteroid Dehydrogenase ◽  
Gas Liquid Chromatography ◽  
Reproducible Method ◽  
Simplified Procedure ◽  
Layer Chromatography

A simple and reproducible method using the non-ionic resin, Amberlite XAD-7, for the isolation of bile acids from serum by a batch procedure is described. Recoveries were greater than 95% for the non-sulphated bile acids and greater than 70% for the sulphate esters of bile acids. By using 1 g of resin, recoveries were independent of the mass (0.1–5 μmol) of the bile acid present. Up to 35 samples a day can be extracted without requiring dedication of the operator. When serum extracts were analysed by the 3α-hydroxysteroid dehydrogenase procedure for estimation of bile acids, virtually all the background fluorescence was eliminated. These extracts were also suitable for gas liquid chromatography, thin layer chromatography, and radioimmunoassay.

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