The effect of synthetic gestagens on progesterone formation in vitro in human placenta of early pregnancy. (1/5)
Villous tissue from 26 placentae of 7-17 weeks was incubated with radioactive pregnenolone alone and with pregnenolone in the presence of progesterone and 9 synthetic gestagenic steroids and the progesterone formation was measured after 30 min. When progesterone was present in a concentration of 31 or 310 mumol/1 the conversion rate of labelled pregnenolone to progesterone was reduced to 88.6 and 82.2% of that of the respective control incubations. Dydrogesterone, allyloestrenol, lynoestrenol and norethynodrel under similar conditions did not inhibit the formation of progesterone. The inhibitory effects of megoestrol acetate, medroxyprogesterone acetate and norgestrel were close to that of progesterone. Norethisterone and methyloestrenolone were the most effective inhibitors of progesterone formation: when incubated in an equimolar concentration (35 mumol/1) with pregnenolone (50 microgram) the progesterone formation was reduced to 60.0-62.7% and 29.1-34.0% respectively of that of the respective control experiments. (+info)Recovery of serum prostate specific antigen value after interruption of antiandrogen therapy with allylestrenol for benign prostatic hyperplasia. (2/5)
Decrease in serum prostate specific antigen (PSA) concentration is inevitably associated with antiandrogen therapy for benign prostatic hyperplasia (BPH), and might mask the presence of prostate cancer or delay its diagnosis. To determine the appropriate timepoint for determination of correct PSA value, we sequentially measured serum PSA and testosterone levels after discontinuation of antiandrogen therapy for BPH. With informed consent, 12 patients (72.8 +/- 12.2* years old) with BPH were treated with allylestrenol 50 mg/day for 4 months. Serum testosterone and PSA concentrations were determined before and just after treatment, as well as every month after treatment up to 3 months. After treatment with allylestrenol for 4 months, mean serum testosterone and PSA levels were significantly decreased from 408 +/- 136* to 87.9 +/- 76.2* ng/dl, and from 2.81 +/- 0.87* to 2.04 +/- 0.82* ng/ml, respectively. The mean serum PSA level recovered to the pretreatment level within 2 months and mean serum testosterone concentration within one month after discontinuation of administration. In conclusion, during treatment of BPH with antiandrogen allylestrenol, a two-month washout is adequate for determination of correct PSA value (*: M +/- SD). (+info)A case of suspected teratogenic holoprosencephaly. (3/5)
A case of holoprosencephaly is reported in which the mother was prescribed high doses of oestroprogestins during the first 5 months of the pregnancy. Investigation of the family failed to reveal any sign of physical abnormality. A normal karyotype was detected in the proband. The authors suggest that this case may shed some light on the normal and abnormal way in which embryonic fields develop. (+info)Effects of a new non-steroidal 5 alpha-reductase inhibitor, FK143, on the prostate gland in beagle dogs. (4/5)
FK143 (4-[3-[3-[bis(4-isobutylphenyl)methylamino]benzoyl]-1H-indol-1-yl] - butyric acid) is a new non-steroidal inhibitor of steroid 5 alpha-reductase (5 alpha-reductase). The effects of FK143 on prostate size and histopathology of mature male beagle dogs were investigated and compared with those of finasteride (a steroidal 5 alpha-reductase inhibitor), and allylestrenol and chlormadinone acetate (CMA) (androgen receptor antagonists). FK143 was orally administered to the dogs daily for 12 weeks. At doses of 10 and 32 mg/kg, FK143 significantly reduced prostate volume to about 60% of the initial value, and dogs treated with FK143 showed a dose-dependent glandular epithelial atrophy in the prostate. FK143 showed no abnormal changes in organ weights and histopathology of the adrenal, testis, pituitary and liver. The degree of prostate reduction in the dogs treated with FK143 (10 and 32 mg/kg) was almost the same as that by finasteride (1.0 mg/kg) and smaller than that by allylestrenol (10 mg/kg) or CMA (10 mg/kg). However, allylestrenol increased liver weights, and CMA increased liver and reduced adrenal weights. These results demonstrate that FK143 can decrease the volume of the dog prostate without any influence on other organs, and they suggest that FK143 is a good candidate for the treatment for benign prostatic hyperplasia. (+info)Effects of steroid 5alpha-reductase inhibitor ONO-9302 and anti-androgen allylestrenol on the prostatic growth, and plasma and prostatic hormone levels in rats. (5/5)
ONO-9302 [epristeride; (-)-17beta-(tert-butylcarbamoyl)androsta-3,5-diene-3-carboxy lic acid] is a novel inhibitor of steroid 5alpha-reductase. We studied in vitro and in vivo effects of ONO-9302 on the rat prostatic tissue in comparison with those of the anti-androgen allylestrenol. ONO-9302 inhibited the rat prostatic enzyme with an IC50 value of 11 nM, whereas allylestrenol was about 80,000-fold less potent. The growth of ventral prostate, which was induced by the subcutaneous injection of testosterone propionate in the castrated rats, was significantly reduced by ONO-9302 at oral doses of 1-100 mg/kg/day. Allylestrenol showed a significant effect only at a dose of 100 mg/kg/day. In mature male rats, ONO-9302 significantly reduced the ventral prostate weight at doses of 10-100 mg/kg/day and decreased prostatic 5alpha-dihydrotestosterone (DHT) content associated with a rise in testosterone (T) content at doses of 0.1-100 mg/kg/day. Plasma hormone levels (i.e., T, DHT, luteinizing hormone (LH) and follicle stimulating hormone (FSH)) were not altered significantly. Allylestrenol significantly reduced the ventral prostate weight at doses of 10-100 mg/kg/day. However, unlike ONO-9302, allylestrenol reduced both the prostatic DHT and T contents and also lowered plasma T, DHT, LH and FSH levels at a dose of 30 mg/kg/day. These results suggest that ONO-9302 reduces the prostatic growth by inhibiting the conversion of T to DHT in the prostate without lowering blood T level unlike anti-androgen drugs. (+info)Allylestrenol Supplier, Allylestrenol Wholesaler, Ahmedabad
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