Endocrine research communications最新文献

{"title":"Failure of tumor promoter 12-O-tetradecanoylphorbol-13-acetate to displace estradiol from its specific receptor.","authors":"D D Hagerman","doi":"10.1080/07435807909061105","DOIUrl":"https://doi.org/10.1080/07435807909061105","url":null,"abstract":"<p><p>A permanent cell line derived from rat endometrium which contains a specific, low capacity, high affinity estrogen binding protein in cytosol and nuclear fractions (estrogen receptor) is available. Extracts of cells from this line did not appreciably bind the tumor promoter, 12-0-tetradecanoylphorbol-13-acetate. The result suggests that the action of the promoter does not involve translocation to the cell nucleus via binding to the specific estrogen receptor.</p>","PeriodicalId":75821,"journal":{"name":"Endocrine research communications","volume":"6 4","pages":"257-63"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/07435807909061105","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11748160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bombesin stimulates the release of insulin and glucagon, but not pancreatic somatostatin, from the isolated perfused dog pancreas.","authors":"E Ipp,&nbsp;R H Unger","doi":"10.3109/07435807909070882","DOIUrl":"https://doi.org/10.3109/07435807909070882","url":null,"abstract":"<p><p>Synthetic bombesin, perfused in the isolated canine pancreas at a rate of 340-380 ng/min for 10 min, elicited a 4-fold rise in insulin to a peak at 2 min; a rapid decline followed discontinuation of bombesin. Glucagon rose by 50% to a peak at 6 min, but remained elevated after discontinuation of the bombesin. Somatostatin-like immunoreactivity was not significantly affected by perfusion with bombesin.</p>","PeriodicalId":75821,"journal":{"name":"Endocrine research communications","volume":"6 1","pages":"37-42"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/07435807909070882","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11593925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimation of 5 alpha-dihydrotestosterone receptors in human breast tumors by the immobilized antibody method.","authors":"H Horn,&nbsp;J H Fishman","doi":"10.3109/07435807909061797","DOIUrl":"https://doi.org/10.3109/07435807909061797","url":null,"abstract":"<p><p>A simple method for estimation of 5 alpha-dihydrotestosterone (DHT) receptors in the cytosol of human breast tumors is described. It is based on the competition of immobilized antibody with the receptors for the labeled hormone. Out of eleven patients with primary breast tumors, four had DHT-receptors, three were negative, and four patients were border line cases.</p>","PeriodicalId":75821,"journal":{"name":"Endocrine research communications","volume":"6 3","pages":"227-34"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/07435807909061797","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11598710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Regulation of ornithine decarboxylase activity in rat ovarian cells in vitro.","authors":"K Piik,&nbsp;H Pösö,&nbsp;J Jänne","doi":"10.1080/07435807909061099","DOIUrl":"https://doi.org/10.1080/07435807909061099","url":null,"abstract":"<p><p>Incubation of rat ovarian cell suspension with human choriogonadotropin (hCG) caused a marked enhancement of ornithine decarboxylase (EC 4.1.1.17) activity after a lag period of several hours. Even though ovarian ornithine decarboxylase could be induced in minimum essential medium by the hormone alone, supplementation of the medium with various sera greatly enhanced the stimulation of the enzyme activity. All the sera tested (human, fetal calf and horse) were able to stimulate ornithine decarboxylase activity even in the absence of hCG. Maximum stimulation of the enzyme activity by hCG and/or serum occurred in ovarian cell suspensions prepared from 30 to 33-day-old rats. There was a close correlation between the stimulation of ornithine decarboxylase activity and the accumulation fo cyclic AMP in response to the administration of the hormone (in the presence or absence of serum). However, while various sera alone markedly enhanced ovarian ornithine decarboxylase activity in vitro they, if anything, only marginally stimulated the accumulation of cyclic AMP and the secretion of progesterone in ovarian cells in the absence of gonadotropin. A similar dissociation of the stimulation of ornithine decarboxylase activity from the production of cyclic AMP and progesterone was likewise found when the ovarian cells were incubated in an enriched medium (M199) supplemented with albumin and lactalbumin hydrolysate in the absence of the hormone. Under these culture conditions ornithine decarboxylase activity was strikingly enhanced, greatly exceeding the stimulation obtained with various sera, while the accumulation of cyclic AMP and the secretion of progesterone remained virtually unchanged. Specific inhibition (up to 90%) of gonadotropin-induced ornithine decarboxylase activity by difluoromethyl ornithine or 1,3-diamino-2-propanol had little effect on the ability of the ovarian cells to respond to the hormone with increasing production of cyclic AMP and progesterone. While showing that rat ovarian ornithine decarboxylase can be induced in vitro by choriogonadotropin or various sera, our results indicate that the activation of the enzyme involves at least two different mechanisms: (i) One (in response to gonadotropin) involving a prior stimulation of cyclic AMP production, and (ii) another (in response to serum) that is not associated with increases in the accumulation of the cyclic nucleotide.</p>","PeriodicalId":75821,"journal":{"name":"Endocrine research communications","volume":"6 2","pages":"107-21"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/07435807909061099","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11443151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Alteration of tissue zinc distribution and biochemical analysis of serum following pinealectomy in the rat.","authors":"S C Cunnane,&nbsp;D F Horrobin,&nbsp;M S Manku,&nbsp;M Oka","doi":"10.1080/07435807909061110","DOIUrl":"https://doi.org/10.1080/07435807909061110","url":null,"abstract":"<p><p>Eight weeks following pinealectomy in adult male Wistar rats, zinc levels of various tissues were found to be significantly altered: zinc in thoracic aorta was significantly increased, and in serum, pituitary, adrenal, heart, lung, and body hair, it was decreased. Serum biochemical analysis indicated that there was a significant elevation of cholesterol, alkaline phosphatase, sodium, urea, and creatinine in serum from pinealectomised rats. Liver, spleen, and thymus weights were lower following pinealectomy, although hearts were increased. The effects of pinealectomy on zinc levels in serum and tissues and on serum cholesterol and alkaline phosphatase may be related to its effects on vascular reactivity and liver fibrosis.</p>","PeriodicalId":75821,"journal":{"name":"Endocrine research communications","volume":"6 4","pages":"311-9"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/07435807909061110","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11748162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Inhibition of lipid peroxidation by calcium ions and their protection of steroid hydroxylase activity from peroxidative damage.","authors":"H Iida,&nbsp;T Kimura","doi":"10.3109/07435807909061795","DOIUrl":"https://doi.org/10.3109/07435807909061795","url":null,"abstract":"<p><p>Lipid peroxidation of adrenocortical mitochondria and microsomes was greatly stimulated by addition of 1.0 mM or less ferric ions. In the presence of NADPH-yielding system, the formation of corticosterone from endogeneous cholesterol and exogeneous deoxycorticosterone was inhibited as the concentrations of iron increased. Of interest is the fact that 0.5 mM ferric ion-mediated lipid peroxidation was completely abroagated upon addition of 2 mM calcium ions. Accordingly, protected from the peroxidative damage.</p>","PeriodicalId":75821,"journal":{"name":"Endocrine research communications","volume":"6 3","pages":"203-12"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/07435807909061795","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11724916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Decrease of estrogen receptors induced by 17 beta-estradiol and progesterone in cultured rabbit endometrial cells.","authors":"J T Murai,&nbsp;R C Lieberman,&nbsp;J J Yang,&nbsp;L E Gerschenson","doi":"10.3109/07435807909061798","DOIUrl":"https://doi.org/10.3109/07435807909061798","url":null,"abstract":"<p><p>A whole cell technique to measure estradiol receptors in cultured rabbit endometrial cells is described. The estradiol receptors measured appear to be composed of at least two components: one component has high affinity but low capacity, while the other component has low affinity but high capacity. Using the assay, the effects of estradiol and progesterone pretreatment were examined on the estradiol receptor levels. It was found that both of the hormones decreased the number of estrogen receptors in the cultured cells. The finding that estradiol decreased its own receptors was unexpected and its possible relevance is discussed.</p>","PeriodicalId":75821,"journal":{"name":"Endocrine research communications","volume":"6 3","pages":"235-47"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/07435807909061798","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11724917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Brain opiate receptor concentrations are increased in adult spontaneously hypertensive rats.","authors":"C P Martucci,&nbsp;E F Hahn","doi":"10.1080/07435807909061108","DOIUrl":"https://doi.org/10.1080/07435807909061108","url":null,"abstract":"<p><p>The saturable binding of 3H-naltrexone in the brains of eight week old spontaneously hypertensive rats (SHR) is about twice that measured in corresponding normotensive WKY rats. This increase is dependent on age since in three and four week old SHR and WKY rats no difference in binding is observed. Scatchard analysis of the saturation curves for the adult animals revealed that the change in binding is due to an increase in the number of binding sites and does not reflect a difference in binding affinity. The increase in opiate receptor content of SHR rats coincides with the appearance of elevated blood pressure in these animals, and supports a concept in which an interaction between the endorphins and the endocrine system may be involved in the mechanisms controlling hypertension.</p>","PeriodicalId":75821,"journal":{"name":"Endocrine research communications","volume":"6 4","pages":"291-7"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/07435807909061108","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11447608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multiplication stimulating activity regulates ornithine decarboxylase in isolated porcine granulosa cells in vitro.","authors":"J D Veldhuis,&nbsp;J M Hammond","doi":"10.1080/07435807909061109","DOIUrl":"https://doi.org/10.1080/07435807909061109","url":null,"abstract":"<p><p>The polypeptide growth factor, multiplication stimulating activity (MSA), stimulates ornithine decarboxylase (ODC) activity in isolated porcine granulosa cells maintained under chemically defined conditions in vitro. The stimulatory action of MSA is saturable, and dose-dependent (0.1-1000 ng/ml). MSA effects are additive to those of luteinizing hormone (LH), but not those of follicle stimulating hormone (FSH). Stimulation of ODC activity by MSA requires cellular protein and RNA synthesis, and appears to be mediated independently of cyclic AMP. These observations provide the first demonstration of MSA action in the mammalian ovary.</p>","PeriodicalId":75821,"journal":{"name":"Endocrine research communications","volume":"6 4","pages":"299-309"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/07435807909061109","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11446631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evidence for a rapid in vivo effect on estradiol-17 beta on prolactin secretion in ovariectomized rats.","authors":"D M Lawson","doi":"10.1080/07435807909061101","DOIUrl":"https://doi.org/10.1080/07435807909061101","url":null,"abstract":"Repeated intraarterial injections of synthetic thryrotropin releasing hormone (TRH, 1 microgram/rat) increased plasma prolactin levels 4 hours after a single subcutaneous injection of 10 micrograms estradiol-17 beta (E2-17 beta) in rats ovariectomized 1, 2 or 4 weeks and at 2 hours after E2-17 beta injection in rats ovariectomized for 6 weeks. The effect of TRH was still present at 24 but not 48 hours after estradiol treatment. TRH-induced increases in plasma prolactin were similar in groups of rats treated with 10 micrograms E2-17 beta (s.c.) or implanted with 0.5 cm Silastic capsules of crystalline E2-17 beta (s.c.) whereas smaller, yet significant, TRH-induced increases in plasma prolactin were observed in rats injected s.c. with 1.0 microgram E2-17 beta. Single intraarterial injections of TRH at 4 or 8 hours after E2-17 beta treatment induced increases in plasma prolactin similar in magnitude to those observed at the same times after E2-17 beta in rats given repeated TRH injections. No effect of TRH was observed in ovariectomized rats given sesame oil and E2-17 beta treatment did not influence plasma prolactin in rats given saline instead of TRH. Intraarterial administration of serotonin creatinine sulfate (5-HT, 10 mg/kg body weight) induced marked increases in plasma prolactin in rats ovariectomized for 4 weeks which were potentiated at 2 and 6 hours after E2-17 beta (10 micrograms) treatment. The data show that estradiol has a fairly rapid stimulatory effect on plasma levels of prolactin induced by two different secretagogues but the exact site and mechanism of action remain unresolved.","PeriodicalId":75821,"journal":{"name":"Endocrine research communications","volume":"6 2","pages":"135-48"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/07435807909061101","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11336548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}