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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

Brain Res Bull. 1999 Jan 1;48(1):93-7.
Gonadotrophin-releasing hormone and oxytocin secretion from the hypothalamus in vitro during pro-oestrus: the effects of time of day and melatonin.

Evans JJ, Janmohamed S, Forsling ML.

Division of Endocrinology and Metabolism, Hammersmith Hospital, London, UK. jevanhmeds.ac.nz

An accurately timed surge of luteinizing hormone (LH), during the second half of the day of pro-oestrus in rats, is a crucial part of the endocrine signal that leads to expulsion of an ovum from an ovarian follicle. LH release is partly controlled by a number of peptides, including gonadotrophin-releasing hormone (GnRH) and oxytocin, which travel from the hypothalamus to the pituitary. The profile of secretion of these peptides is poorly understood. Therefore, the amounts of GnRH and oxytocin that were secreted from hypothalamic explants were determined at several time points during the day of pro-oestrus. Basal secretion of oxytocin from hypothalami taken later in pro-oestrus was greater than from hypothalami taken earlier in the day (p < 0.02). On the other hand, basal secretion of GnRH decreased during the day of pro-oestrus (p < 0.03). The different trends of GnRH and oxytocin secretion reveal that their secretion is regulated by distinct mechanisms. GnRH secretion was higher at midpro-oestrus than late in the day (o < 0.05) consistent with a peak of GnRH having been observed by others in portal blood in the second half of the day of pro-oestrus. Responsiveness of oxytocin to stimulation by K+ of the hypothalami declined from the early light hours to the evening dark hours (p < 0.02). Thus, oxytocin modulation might be achieved partly by modification of intracellular processes. Melatonin, secreted during hours of darkness, is frequently involved in modulating time-dependent events in mammals, but its contribution to peptide regulation during the ovulatory cycle is unclear. Melatonin was observed to inhibit basal oxytocin secretion from hypothalami collected during light hours (p < 0.05). The investigation has, therefore, revealed the potential for melatonin to modulate peptide secretion from the hypothalamus during the day of pro-oestrus. We also observed that secretion from the hypothalamus of the two LH-regulating peptides, GnRH and oxytocin, are differently regulated during the day of pro-oestrus.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10210173&dopt=Abstract

J Appl Physiol. 2003 Oct;95(4):1509-1514. Epub 2003 Jun 20.
Time course and dose response of relaxin-mediated renal vasodilation, hyperfiltration, and changes in plasma osmolality in conscious rats.

Danielson LA, Conrad KP.

Magee-Womens Research Institute, 204 Craft Ave., Pittsburgh, PA 15213. rsikpwri.magee.edu

The pregnancy hormone relaxin elicits renal vasodilation, hyperfiltration, and osmoregulatory changes when chronically administered to conscious, nonpregnant rats. The objective in this study was to determine the dose response and time course of hormone action, as well as the time required for recovery on stopping its administration. The threshold dose of recombinant human relaxin (rhRLX) for renal vasodilation and reduction in plasma osmolality was 0.15 microg/h when given by subcutaneous osmotic minipump for 2 days (an infusion rate that achieved circulating levels of approximately 6 ng/ml). The peak response was observed during the 0.4 microg/h infusion rate (serum rhRLX of approximately 11 ng/ml), which was comparable to our previous work using a 4.0 microg/h (serum rhRLX of approximately 20 ng/ml). In contrast, a dose of 40 microg/h was ineffective (serum rhRLX of approximately 80 ng/ml). When 4.0 microg/h rhRLX was administered by osmotic minipump for shorter periods (</=24 h), renal circulatory and osmoregulatory changes were observed by </=6 h. After removal of the osmotic minipump, these changes persisted for at least 12 h, but they were fully restored by 24 h. Even briefer administration of 4.0 microg/h rhRLX by intravenous infusion showed an onset of action in the kidney by 1-2 h. In contrast, the 40 microg/h dose of rhRLX elicited minimal effects, and comparable to our earlier report, 4.0 microg/h purified porcine relaxin was also relatively ineffective during short-term intravenous administration. In conclusion, the effect of relaxin on the renal circulation and osmoregulation is biphasic, insofar as high doses are relatively inactive, and the onset of action is more rapid than previously believed. These findings may be important to consider when evaluating relaxin in the treatment of renal disease.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12819218&dopt=Abstract [PubMed - as supplied by publisher]

J Am Soc Nephrol. 2003 Jul;14(7):1711-9.
Role of NHERF-1 in regulation of the activity of Na-K ATPase and sodium-phosphate co-transport in epithelial cells.

Lederer ED, Khundmiri SJ, Weinman EJ.

Louisville Veterans Administration Medical Center, Louisville, Kentucky, USA. e.ledereouisville.edu

Parathyroid hormone (PTH), acting at least in part through a cAMP signaling pathway, regulates three important transporters in the renal proximal convoluted tubule, namely Na-H exchanger 3, Na-K ATPase, and type IIa sodium phosphate cotransporter (NaPi IIa). The regulation of Na-H exchanger 3 by protein kinase A requires a protein co-factor from the sodium-hydrogen exchanger regulatory factor (NHERF) family of proteins (NHERF-1 and NHERF-2). However, the role of NHERF in PTH regulation of Na-K ATPase and NaPi IIa has not been explored. For studying the role of NHERF-1 on PTH regulation of these transporters, wild-type mNHERF-1 (1-355) or mNHERF-1 (1-325) lacking the ezrin-binding domain were expressed in proximal tubule-derived opossum kidney cells. PTH inhibited Na-K ATPase activity in cells expressing wild-type NHERF-1 associated with increased serine phosphorylation of the alpha subunit of the transporter. By contrast, in cells expressing mNHERF (1-325), the phosphorylation of the alpha subunit of Na-K ATPase was blunted and the activity of the transporter was stimulated in response to PTH. Basal sodium-dependent phosphate transport was lower in cells expressing mNHERF-1 (1-325) as compared with cells expressing mNHERF-1 (1-355). Nonetheless, there were no differences in PTH-associated inhibition of the activity or the decrease in membrane expression of the NaPi IIa in any of the cell lines. These experiments document for the first time an association between NHERF-1 and PTH regulation of Na-K ATPase in epithelial cells. These experiments also suggest that the mechanism for retrieval of NaPi IIa transporters from the apical membrane in response to cAMP does not require NHERF.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12819230&dopt=Abstract

J Exp Biol. 2003 Aug;206(Pt 15):2665-73.
Regeneration of ultraviolet-sensitive cones in the retinal cone mosaic of thyroxin-challenged post-juvenile rainbow trout (Oncorhynchus mykiss).

Hawryshyn CW, Martens G, Allison WT, Anholt BR.

Department of Biology, University of Victoria, PO Box 3020 Stn. CSC, Victoria, British Columbia, Canada V8W 3N5. chawrysvic.ca

Previous studies in our laboratory have examined the loss of ultraviolet-sensitive (UVS) cones and UV sensitivity. This study looks at the question of regeneration of UVS cones and its topographic distribution, along with several other measures of the cone mosaic. Topography of the cone mosaic in rainbow trout smolts (post-metamorphic juveniles) was examined under normal growth conditions and during an exogenous thyroid hormone (TH) challenge. Growth of trout retina was studied over six weeks. Retinas sampled at 0, 3 and 6 weeks were embedded in EPON resin, and thick (1 micro m) tangential sections were stained with Richardson's stain. Sites representing central ventral, ventral, temporal, dorsal and nasal retina were sampled. Variables measured were cone densities, mean double cone diameter and mean spacing between cones of the same type. These same variables were compared with those of fish that were challenged with L-thyroxin (T4), and regeneration of UVS cones was assessed. Principal components of the correlation matrix of all photoreceptor measurements were analysed using analysis of variance. Here, we show several interesting effects of thyroxin exposure on post-metamorphic rainbow trout: (1) controls at week 0 have a high density of UVS cones in the temporal and dorsal sampling regions and a high density of blue (short-wavelength)-sensitive (SWS) and double cones across all regions sampled; (2) both control and TH-treated fish had less abundant, larger and less tightly packed SWS and double cones and a lower density of UVS cones in the temporal and dorsal sampling regions three and six weeks into the experiment compared with the starting condition at week 0; (3) fish treated with TH had a higher UVS cone density in the nasal and ventral sampling regions and there were higher densities of SWS and double cones in the central ventral, temporal and ventral regions, but lower densities in the nasal sampling regions, relative to the controls. The regeneration of UVS cones into the ventral retinal hemisphere in post-juvenile salmonids has important implications for visually guided behavior.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12819272&dopt=Abstract [PubMed - in process]

J Exp Biol. 2003 Aug;206(Pt 15):2675-84.
Angiotensin II-induced inotropism requires an endocardial endothelium-nitric oxide mechanism in the in-vitro heart of Anguilla anguilla.

Imbrogno S, Cerra MC, Tota B.

Department of Cellular Biology, University of Calabria, 87030, Arcavacata di Rende, CS, Italy.

Using an isolated working heart preparation we show that angiotensin II (ANG II), at concentrations of 10(-10)-10(-7) mol l(-1), elicits negative chronotropism and inotropism in the freshwater eel Anguilla anguilla. The negative inotropism was insensitive to losartan and CGP42112 (AT(1) and AT(2) ANG II receptor antagonists, respectively), and was abrogated by the AT(1) receptor antagonist CV11974, the G protein blocker pertussis toxin (PTx) and the muscarinic antagonist atropine. In contrast, it was not affected by the adrenoceptor antagonists propanolol, sotalol and phentolamine. Using donors (L-arginine) and inhibitors [N(G)-monomethyl-(L)-arginine (L-NMMA), L-N(5)(1-iminoethyl)ornithine ((L)-NIO)] of nitric oxide synthase (NOS), and haemoglobin as NO scavenger, we demonstrate that NO signalling is involved in ANG II-mediated inotropism. Pretreatment with Triton X-100, a detergent that damages the endocardial endothelium (EE), or with 1H-(1,2,4)oxadiazolo-(4,3-a)quinoxalin-1-one (ODQ), a specific inhibitor of soluble guanylate cyclase, or with the cGMP-activated protein kinase (PKG) inhibitor KT5328, abolished ANG II-mediated inotropism. Thus, ANG II-mediated inotropism occurs via an EE-NO-cGMP-PKG mechanism. ANG II did not affect the mechanical performance influenced by preload changes (i.e. the Frank-Starling response), which in the eel heart is modulated by NO. This EE-paracrine-mediated cardio-suppressive action of endoluminal ANG II suggests that the hormone plays an important intracardiac role in the fish heart.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12819273&dopt=Abstract [PubMed - in process]

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