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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

J Cell Physiol. 2002 Oct;193(1):10-8.
PTH-dependent adenylyl cyclase activation in SaOS-2 cells: passage dependent effects on G protein interactions.

Gao H, Bodine PV, Murrills R, Bex FJ, Bilezikian JP, Morris SA.

Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York, USA.

Parathyroid hormone (PTH) sensitive adenylyl cyclase activity (ACA) in SaOS-2 cells varies as a function of cell passage. In early passage (EP) cells (< 6), ACA in response to PTH and forskolin (FOR) was relatively low and equivalent, whereas in late passage (LP) cells (> 22), PTH exceeded FOR dependent ACA. Potential biochemical mechanisms for this passage dependent change in ACA were considered. In EP, prolonged exposure to pertussis toxin (PT) markedly enhanced ACA activity in response to PTH, Isoproterenol and Gpp(NH)p, whereas ACA in response to FOR was decreased. In contrast, the identical treatment of LP with PT diminished all ACA in response to PTH, Gpp(NH)p, and FOR. The dose dependent effects of PT on subsequent [(32)P]ADP-ribosylation of its substrates, GTPase activity, as well as FOR-dependent ACA, were equivalent in EP and LP. The relative amounts of G(alpha)i and G(alpha)s proteins, as determined both by Western blot, PT and cholera toxin (CT) dependent [(32)P]ADP-ribosylation, were quantitatively similar in EP and LP. Western blot levels of G(alpha)s and G(alpha)i proteins were not influenced by prior exposure to PT. Both PT and CT dependent [(32)P]ADP-ribosylation were dose-dependently decreased following exposure to PT. However, the PT-dependent decline in CT-dependent [(32)P]ADP-ribosylation occurred with enhanced sensitivity in LP. The protein synthesis inhibitor cycloheximide partially reversed the PT associated decrease in FOR dependent ACA in EP. In contrast, cycloheximide completely reversed the PT associated decrease in FOR and as well as PTH dependent ACA in LP. G(alpha)s activity, revealed by cyc(-) reconstitution, was not altered either by cell passage or exposure to PT. The results suggest that the coupling between the components of the complex may be pivotally important in the differential responsiveness of early and late passage SaOS-2 cells to PTH. 2002 Wiley-Liss, Inc.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12209875&dopt=Abstract

Neuroscience. 1999 Mar;89(3):955-64.
Sex and seasonal differences in the rate of cell proliferation in the dentate gyrus of adult wild meadow voles.

Galea LA, McEwen BS.

Laboratory of Neuroendocrinology, The Rockefeller University, New York, NY 10021, USA.

In order to study the neurobiological basis of seasonal changes in hippocampal structure and function, the rate of cell proliferation was examined in male and female wild meadow voles captured during different seasons. We found that the number of [3H]thymidine-labeled cells varied across the seasons and across sex in the meadow vole. Non-breeding female meadow voles had a higher rate of cell proliferation and cell death than males captured during either season or breeding females. These seasonal changes in the female meadow vole were associated with both fluctuating levels of adrenal steroids and gonadal steroids. Estradiol level was highly correlated with both the number of [3H]thymidine-labeled cells and the number of pyknotic cells in female meadow voles, with high levels of estradiol being associated with low levels of cell proliferation and cell death. Corticosterone level was associated with the number of [3H]thymidine-labeled cells in the hilus of female meadow voles. This seasonal change in the number of [3H]thymidine-labeled cells was also related to the overall volume of the hippocampus. At variance with past literature, there was no statistically significant sex difference favoring males in hippocampal volume, although the means were in the predicted direction. In male meadow voles, the number of pyknotic cells was related to testosterone level, with high levels of testosterone being associated with greater levels of cell death in the granular cell layer. There was also a suggestion that the number of [3H]thymidine-labeled cells in the hilus varied seasonally in males, with higher rates of cell proliferation during the breeding season than during the non-breeding season. In summary, we found that there were large fluctuations across the season in the rate of cell proliferation in the dentate gyrus of adult female meadow voles. Females captured during the non-breeding season had higher rates of cell proliferation in the granule cell layer than females captured during the breeding season. This seasonal fluctuation was related to hormone levels, with high levels of corticosterone and estradiol being related to lower levels of cell proliferation. These seasonal changes in cell proliferation may be related to known changes in spatial learning in the meadow vole and provide insights into changes in the hippocampus that occur in other species, including primates.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10199627&dopt=Abstract

J Pathol. 2002 Sep;198(1):77-82.
Neuropilin-2 is a novel marker expressed in pancreatic islet cells and endocrine pancreatic tumours.

Cohen T, Herzog Y, Brodzky A, Greenson JK, Eldar S, Gluzman-Poltorak Z, Neufeld G, Resnick MB.

Department of Pathology, Carmel Medical Center and Rappaport Faculty of Medicine, Technion Institute of Technology, Haifa, Israel.

Neuropilin-2 (NP-2) is a cell surface transmembrane protein originally characterized as a receptor for the type 3 semaphorins, and more recently for a number of vascular endothelial growth factor (VEGF) isoforms. NP-2 expression has been recently localized to a subset of neuroendocrine cells in the gastrointestinal tract. The aim of this study was to define the expression pattern of NP-2 in normal pancreatic islets and to determine the utility of NP-2 expression as a diagnostic marker of pancreatic endocrine tumours. Paraffin-embedded tissue sections from 30 endocrine pancreatic tumours (EPTs) and from normal pancreas were immunostained with a rabbit polyclonal antibody generated towards NP-2. Nineteen of the tumours were hormonally functional (nine insulinomas, nine gastrinomas, and one glucagonoma). The NP-2 staining pattern was correlated with islet cell hormone expression. In addition, NP-2 expression was evaluated in other normal neuroendocrine tissues and neuroendocrine neoplasms. In normal pancreas, NP-2 stained a distinct subset of islet cells situated primarily at the islet periphery. Double immunohistochemical staining revealed co-localization with glucagon-expressing cells. Moderate to strong NP-2 staining was present in 27 of 30 EPTs. Serial staining of the pancreatic tumours with insulin, gastrin, glucagon, pancreatic polypeptide (PP) or somatostatin did not reveal a distinct pattern of co-localization. NP-2 expression was not detected in neuroendocrine cells outside the gastroenteropancreatic system, or in their corresponding neoplasms, except for focal staining in one bronchial carcinoid tumour. In conclusion, the vast majority of EPTs examined expressed NP-2, suggesting its utility as a diagnostic marker for these tumours. The function of NP-2 in islet cell biology or tumourigenesis remains to be elucidated. 2002 John Wiley & Sons, Ltd.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12210066&dopt=Abstract

J Neurobiol. 2002 Sep 15;52(4):312-21.
Ovarian hormones after postnatal day 20 reduce neuron number in the rat primary visual cortex.

Nunez JL, Sodhi J, Juraska JM.

Neuroscience Program, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

Previous work from our lab has documented a sex difference in neuron number in the binocular region of the adult rat primary visual cortex (Oc1B), with males having 19% more neurons than females. In the present study, the role of developmental steroid hormones in the formation of this difference was explored. Male and female rats underwent neonatal hormone manipulation (female + testosterone or dihydrotestosterone; male + flutamide) followed by gonadectomy on postnatal day 20. Animals that did not undergo hormone manipulation were either gonadectomized or sham operated at day 20. Neuron number was quantified in the monocular (Oc1M) and binocular (Oc1B) subfields of the adult rat primary visual cortex using the optical disector technique. As adults, day 20 gonadectomized females, as well as females + testosterone and females + dihydrotestosterone, had significantly more neurons than intact females. There was no difference in neuron number between postnatal day 20 gonadectomized males, males + flutamide, and intact males. Also, intact males had significantly more neurons than intact females in both in Oc1M and Oc1B. It appears that ovarian steroids after day 20 are the primary cause of the lower number of neurons in the primary visual cortex of the female rat. 2002 Wiley Periodicals, Inc. J Neurobiol 52: 312-321, 2002

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12210098&dopt=Abstract

Muscle Nerve. 2002 Sep;26(3):383-8.
Apoptosis and apoptosis-related proteins in thyroid myopathies.

Monici MC, Rodolico C, Toscano A, Messina S, Benvenga S, Messina C, Vita G.

Clinica Neurologia 2, Department of Neurosciences, Psychiatry and Anaesthesiology, Policlinico Universitario, 98125 Messina, Italy.

DNA fragmentation and apoptosis-related proteins have been investigated in thyroid cells and there is evidence that Fas-mediated apoptosis is inhibited by thyroid stimulating hormone (TSH). We investigated DNA fragmentation by terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL), and Bcl-2 and Fas antigen expression by immunocytochemistry in skeletal muscles from 12 patients with hypothyroid myopathy and 5 patients with hyperthyroid myopathy. The finding of very few TUNEL-positive muscle fibers in both conditions suggests that apoptosis does not play a role in the pathogenesis of thyroid myopathies. Bcl-2 expression increased significantly in hypothyroid myopathy, correlating with high serum TSH levels, and not with either triiodothyronine (T3) or thyroxine (T4) serum levels. By contrast, Fas antigen was overexpressed in hyperthyroid myopathy, correlating with low TSH levels. These findings suggest an anti-apoptotic role for TSH itself in skeletal muscle. 2002 Wiley Periodicals, Inc.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12210368&dopt=Abstract

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