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Pathogen research abs 1 || Pathogen research abs 2 || Pathogen research abs 3 || Pathogen research abs 4 || Pathogen research abs 5 || Hormone and endocrine research abs 1 || Hormone and endocrine research abs 2 || Hormone and endocrine research abs 3 || Hormone and endocrine research abs 4 || Hormone and endocrine research abs 5

Adv Exp Med Biol. 1979;112:577-601.
Prostaglandin F2 alpha and its 13-dehydro analogs: comparative luteolytic effects in vivo.

McCracken JA, Einer-Jensen N, Fried J.

Prostaglandin F2 alpha (PGF2 alpha) was identified as a luteolytic hormone in sheep (Nature, New Biol. 238, 129, 1972). Attempts to use PGF2 alpha for the pharmacological control of luteolysis in normal cycling sheep met with only partial success due to the rapid clearance of PGF2 alpha from the blood. In addition treated animals showed moderate to severe cardiovascular and gastrointestinal side effects. Accordingly, experiments were carried out to determine whether PG analogs might be more effective as pharmacological luteolytic agents. These compounds, which consisted of a number of the 13-dehydro analogs of PGF2 alpha, were administered to both sheep and monkeys either directly into the ovary or into the systemic circulation to examine them respectively for direct luteolytic activity and for resistance to metabolism. In addition in both the sheep and the monkey smooth muscle activity of the analogs was determined by recording uterine contractions in vivo. Several 13-dehydro analogs including some 16-fluoro derivatives were shown to have luteolytic activity equal to, or in some cases greater than, PGF2 alpha itself. Furthermore most of these compounds showed a marked resistance to the 15-OH-PG-dehydrogenase enzyme in vivo as evidenced by their luteolytic activity when infused intravenously. In terms of uterine contractions, several luteolytic analogs showed markedly diminished smooth muscle activity, and in some cases, complete absence of activity. These results suggest that the receptors governing the luteolytic effect on the one hand, and the smooth muscle effect on the other, possess different structural specificities. Recent studies which we have carried out on the effect of PGF2 alpha on corpus luteum (CL) blood flow support this conclusion. CL capillary blood flow was continuously monitored by means of a miniaturized Geiger-Muller probe inserted through the center of the CL in both the in situ and the autotransplanted ovary of the sheep. Capillary blood flow was measured by the clearance rate of 85Krypton injected periodically into the ovarian artery before and during the induction of luteolysis with PGF2 alpha. It was concluded that the initiation of luteolysis is not dependent on a smooth muscle effect of PGF2 alpha on the capillaries of the CL, a finding which supports the results with the synthetic analogs devoid of smooth muscle activity. More recently, in the primate model used (Macaca fascicularis) we have demonstrated that certain metabolically stable analogs are luteolytic when given intravenously, subcutaneously, or orally. These results demonstrate a rational approach to both drug synthesis and biological evaluation and suggest that a once-a-month contraceptive agent, based on a luteolytic analog of PGF2 alpha, devoid of smooth muscle activity (side effects) and metabolically stable in the bloodstream may become a reality.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=111476&dopt=Abstract

Calcif Tissue Int. 1979 Mar 13;27(1):47-52.
Interaction of 24,25-dihydroxyvitamin D3 and parathyroid hormone on bone enzymes in vitro.

Lieberherr M, Garabedian M, Guillozo H, Bailly du Bois M, Balsan S.

The in vitro effects of vitamin D3 metabolites, parathyroid extract (PTE), purified parathyroid hormone (bPTH), vitamin A, and heparin on acid and alkaline phosphatases in rat or mouse calvaria in culture were investigated. Results show that: (a) when compared to values found in half calvaria incubated for 24 h in control medium, the bone acid and alkaline phosphatase content is significantly higher in paired halves incubated with PTE (L USP/ml), bPTH (4 x 10(-8)M), heparin (5 USP/ml), vitamin A (23 USP/ml), 25-(OH)D3 (2.5 x 10(-11) to 2.5 x 10(-8)M), 24,25-(OH)2D3, and 1,25-(OH)2D3 (2.5 x 10(-12) to 2.5 x 10(-7M); (b) the presence of 24,25-(OH)2D3 at low concentrations in the incubation medium decreases significantly the PTE, bPTH, vitamin A, or heparin induced stimulation of the phosphatase activities. This interaction is also observed when measuring beta glucuronidase and glucose-6-phosphatase activities and 45Ca release from previously labeled mouse calvaria; (c) a similar activity could not be found with 1,25-(OH)2D3 suggesting that 24,25-(OH)2D3 may have a specific role in bone metabolism.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=111787&dopt=Abstract

Eur J Pharmacol. 2003 Apr 25;467(1-3):125-31.
Role of brain thromboxane A2 in the release of noradrenaline and adrenaline from adrenal medulla in rats.

Okada S, Murakami Y, Yokotani K.

Department of Pharmacology, Kochi Medical School, Nankoku, Kochi 783-8505, Japan.

Plasma noradrenaline reflects the release from adrenal medulla and sympathetic nerves; however, the exact mechanisms of adrenal noradrenaline release remain to be elucidated. The present study was designed to characterize the source of plasma noradrenaline induced by centrally administered vasopressin and corticotropin-releasing hormone (CRH) in urethane-anesthetized rats. Intracerebroventricularly administered vasopressin (0.2 nmol/animal) and CRH (1.5 nmol/animal) elevated plasma levels of noradrenaline and adrenaline. Intracerebroventricularly administered indomethacin [1.2 micromol (500 microg)/animal] (an inhibitor of cyclooxygenase) abolished the elevations of both noradrenaline and adrenaline induced by vasopressin and CRH. Intracerebroventricularly administered furegrelate [1.8 micromol (500 microg)/animal] (an inhibitor of thromboxane A(2) synthase) abolished the elevations of both noradrenaline and adrenaline induced by vasopressin, while the reagent only attenuated the elevation of plasma adrenaline evoked by CRH. Acute bilateral adrenalectomy abolished the elevation of both noradrenaline and adrenaline induced by vasopressin, while the procedure reduced only the elevation of adrenaline induced by CRH. These results suggest that the release of noradrenaline from adrenal medulla and sympathetic nerves is mediated by different central mechanisms. The vasopressin-induced noradrenaline release from adrenal medulla is mediated by brain thromboxane A(2)-mediated mechanisms, while the CRH-induced noradrenaline release from sympathetic nerves is mediated by brain prostanoid (other than thromboxane A(2))-mediated mechanisms. The vasopressin- and CRH-induced adrenaline release from adrenal medulla is also mediated by brain thromboxane A(2)-mediated mechanisms in rats.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12706465&dopt=Abstract [PubMed - in process]

C R Seances Acad Sci D. 1979 Jan 22;288(3):347-9.
[Plasma growth hormone in the rabbit fetus. Relation to maturation of the liver and lung]

[Article in French]

Jost A, Rieutort M, Bourbon J.

Day 25 after insemination is a date of peculiar importance in the maturation of several organs in the Rabbit fetus. From day 25 onward the fetal liver stores increasing amounts of glycogen and the lung stores increasing amounts of lecithins, concomitant with sudden rise in the activity of lung phosphatidic-acid phosphohydrolase. Earlier studies on decapitated fetuses established that glycogen storage in the liver is dependent on a dual hormonal control, comprising a pituitary hormone like growth hormone or prolactin (some placental hormones share the same activity) and corticosteroids (Jost, 1961). Since the variations in endogenous corticosteroids do not seem to herald these liver or lung changes (Mulay et al., 1973), a study was made of growth hormone. Plasma immunoreactive growth hormone--determined with a heterologous Rat system (Kervran et al., 1976)--increases eightfold between days 23 and 25. During the same time plasma prolactin does not change according to McNeily and Friesen, 1978, and to unpublished data obtained with Dr McNeilly. In preliminary assays, Rat growth hormone was seen to increase phosphorylase "a" activity in the lung of 18.5 day-old Rat fetuses, thus anticipating normal development. We suggest that growth hormone plays a role in initiating liver and lung maturation.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=111856&dopt=Abstract

Eur J Clin Invest. 1979 Apr;9(2 Pt 1):115-27.
Pituitary hormones and the small bowel: effect of hypophysectomy on intestinal adaptation to small bowel resection in the rat.

Taylor B, Murphy GM, Dowling RH.

The influence of pituitary hormones on intestinal adaptation to small bowel resection was studied by examining jejunal and ileal structure and function in control and in sham-operated rats, and in animals with 50% proximal or distal resection which were divided into three main groups: normally-fed, hypophysectomized. and pair-fed. The pituitary was removed 2 weeks before intestinal surgery and gut structure and function were studied 4 weeks later. The effectiveness of hypophysectomy was confirmed by histological examination of the aspirated pituitary, and by showing a significant subsequent reduction in weight of the testes and adrenals. Food intake and body weight fell significantly after removing the pituitary; intestinal surgery caused a transient further decrease in food intake. Measurements of intestinal villus height and crypt depth, indices of mucosal mass (mucosal wet weight, protein and DNA content/cm intestine), measurements of mucosal alpha-glucosidase activity, and in vivo galactose absorption/unit length of intestine all showed comparable results. In rats with an intact intestine, resection resulted in mucosal hyperplasia and increased segmental absorption. Following hypophysectomy, there was marked mucosal hypoplasia and hypofunction which seemed to be due largely to associated hypophagia since comparable changes were found in the pair-fed, sham-operated rats. However following pituitary removal, both distal jejunum and proximal ileum retained their capacity to regenerate though the magnitude of this adaptive change was much greater in the resected, pair-fed rats suggesting that hypophagia alone cannot explain the diminished adaptation to resection after hypophysectomy. By inference, pituitary hormones do influence the adaptive response to resection.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=111942&dopt=Abstract

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