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Am J Physiol Renal Physiol. 2002 Jul;283(1):F29-40.
Plasma membrane Ca2+-ATPase and NCX1 Na+/Ca2+ exchanger expression in distal convoluted tubule cells.

Magyar CE, White KE, Rojas R, Apodaca G, Friedman PA.

Department of Pharmacology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, USA.

The plasma membrane Ca2+-ATPase (PMCA) and the NCX1 Na+/Ca2+ exchanger regulate intracellular Ca2+ concentrations and mediate Ca2+ efflux in absorptive epithelial cells. We characterized the PMCA isoforms and subtypes expressed in mouse distal convoluted tubule (mDCT) cells and Na+/Ca2+ exchanger protein expression in mDCT cells. In lysates of mDCT cells, immunoprecipitation and Western blot analysis, performed with a monoclonal antibody to PMCA, revealed a 140-kDa protein consistent with PMCA. Laser-scanning confocal fluorescence microscopy indicated that PMCA and NCX1 expression is restricted to basolateral membranes only in confluent mDCT cells, because subconfluent cultures predominately express intracellular localizations. PMCA isoform-specific PCR primers generated appropriately sized products only for PMCA1 and PMCA4 from DCT cells but PMCA1-4 from whole mouse kidney. Assessment of splice site C within the calmodulin-binding domain demonstrated the presence of PMCA1b and PMCA4b mRNAs in mDCT cells. Northern blot analysis of mDCT cell RNA revealed transcripts of 7.5 and 5.5 kb for PMCA1 and 8.5 and 7.5 kb for PMCA4. We conclude that DCT cells express PMCA transcripts encoding PMCA1b and PMCA4b. Basolateral localization of the Na+/Ca2+ exchanger and MCAs support the idea that multiple PMCA isoforms, in concert with the Na+/Ca2+ exchanger, mediate basal or hormone-stimulated Ca2+ efflux by distal tubules.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12060584&dopt=Abstract

Am J Physiol Renal Physiol. 2002 Jul;283(1):F105-13.
Hypotonic induction of SGK1 and Na+ transport in A6 cells.

Rozansky DJ, Wang J, Doan N, Purdy T, Faulk T, Bhargava A, Dawson K, Pearce D.

Division of Nephrology, Department of Pediatrics, University of California, San Francisco, California 94143-0532, USA.

Serum and glucocorticoid-regulated kinase-1 (SGK1) is a serine-threonine kinase that is regulated at the transcriptional level by numerous regulatory inputs, including mineralocorticoids, glucocorticoids, follicle-stimulating hormone, and osmotic stress. In the distal nephron, SGK1 is induced by aldosterone and regulates epithelial Na+ channel-mediated transepithelial Na+ transport. In other tissues, including liver and shark rectal gland, SGK1 is regulated by hypertonic stress and is thought to modulate epithelial Na+ channel- and Na+-K+-2Cl- cotransporter-mediated Na+ transport. In this report, we examined the regulation of SGK1 mRNA and protein expression and Na+ currents in response to osmotic stress in A6 cells, a cultured cell line derived from Xenopus laevis distal nephron. We found that in contrast to hepatocytes and rectal gland cells, hypotonic conditions stimulated SGK1 expression and Na+ transport in A6 cells. Moreover, a correlation was found between SGK1 induction and the later phase of activation of Na+ transport in response to hypotonic treatment. When A6 cells were pretreated with an inhibitor of phosphatidylinositol 3-kinase (PI3K), Na+ transport was blunted and only inactive forms of SGK1 were expressed. Surprisingly, these results demonstrate that both hypertonic and hypotonic stimuli can induce SGK1 gene expression in a cell type-dependent fashion. Moreover, these data lend support to the view that SGK1 contributes to the defense of extracellular fluid volume and tonicity in amphibia by mediating a component of the hypotonic induction of distal nephron Na+ transport.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12060592&dopt=Abstract

J Biol Chem. 2002 Aug 23;277(34):31107-14. Epub 2002 Jun 11.
Prolactin induces SHP-2 association with Stat5, nuclear translocation, and binding to the beta-casein gene promoter in mammary cells.

Chughtai N, Schimchowitsch S, Lebrun JJ, Ali S.

Department of Medicine, Division of Hematology, Molecular Oncology Group, Royal Victoria Hospital, McGill University Health Centre, 687 Pine Avenue, Montreal, Quebec H3A 1A1, Canada.

The Src homology 2 (SH2) domain containing protein-tyrosine phosphatase SHP-2 contributes to prolactin receptor (PRLR) signal transduction to beta-casein gene promoter activation. We report for the first time that SHP-2 physically associates with the signal transducer and activator of transcription-5a (Stat5a), an important mediator of PRLR signaling to milk protein gene activation, in the mouse mammary HC11 and the human breast cancer T47D cells when stimulated with prolactin (PRL) and human growth hormone, respectively. In addition, overexpression studies indicate that the carboxyl-terminal SH2 domain of SHP-2 is required to maintain tyrosine phosphorylation of Stat5 and its interaction with SHP-2. Furthermore, we demonstrate by nuclear co-immunoprecipitation and indirect immunofluorescence studies that PRL stimulation of mammary cells leads to the nuclear translocation of SHP-2 as a complex with Stat5a. This process was found to involve the catalytic activity of the phosphatase. Finally, using the Stat5 GAS (gamma-activated sequence) element of the beta-casein gene promoter in electrophoretic mobility shift assays, we demonstrate that PRL induces the SHP-2-Stat5a complex to bind to DNA. The presence of the phosphatase in the protein-bound DNA complex was verified by using polyclonal antisera to SHP-2. Our studies indicate a tight physical and functional interaction between SHP2 and Stat5 required for regulation and perpetuation of PRL-mediated signaling in mammary cells and suggest a potential role for SHP-2 in the nucleus.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12060651&dopt=Abstract

Environ Health Perspect. 2002 Jun;110 Suppl 3:423-8.
The parvocellular vasotocin system of Japanese quail: a developmental and adult model for the study of influences of gonadal hormones on sexually differentiated and behaviorally relevant neural circuits.

Panzica GC, Bakthazart J, Pessatti M, Viglietti-Panzica C.

Department of Anatomy, Pharmacology, and Forensic Medicine, Laboratory of Neuroendocrinology, Rita Levi Montalcini Center for Brain Repair, University of Torino, c.so M. D'Azeglio 52, I-10126 Turin, Italy. giancarlo.panzicnito.it

Vasotocin (VT; the antidiuretic hormone of birds) is synthesized by diencephalic magnocellular neurons projecting to the neurohypophysis. A sexually dimorphic system of VT-immunoreactive (ir) parvocellular elements has been described within the male medial preoptic nucleus (POM) and the nucleus of the stria terminalis, pars medialis (BSTm). VT-ir fibers are present in many diencephalic and extradiencephalic locations, and quantitative morphometric analyses demonstrated their sexually dimorphic distribution in regions involved in the control of different aspects of reproduction. Moreover, systemic or intracerebroventricular injections of VT markedly inhibit the expression of some aspects of male sexual behavior. In adult animals, circulating levels of testosterone (T) have a profound influence on the VT immunoreactivity within BSTm, POM, and lateral septum. Castration markedly decreases the immunoreaction, whereas T-replacement therapy restores a situation similar to the intact birds. We observed no changes in gonadectomized females treated with T. These changes parallel similar changes in male copulatory behavior (not present in castrated male quail, fully expressed in castrated, T-treated males). The restoration by T of the VT immunoreactivity in castrated male quail could be fully mimicked by a treatment with estradiol (E(2)), suggesting that the aromatization of T into E(2) may play a key limiting role in both the activation of male sexual behavior and the induction of VT synthesis. This dimorphism has an organizational nature: administration of E(2) to quail embryos (a treatment that abolishes male sexual behavior) results in a dramatic decrease of the VT immunoreactivity in sexually dimorphic regions. Conversely, the inhibition of E(2) synthesis during embryonic life (a treatment that stimulates the expression of male copulatory behavior in treated females exposed in adulthood to T) results in a malelike distribution of VT immunoreactivity. The VT parvocellular system of the Japanese quail can therefore be considered an accurate marker of the sexual differentiation of brain circuits mediating copulatory behavior and could be a very sensitive indicator of the activity of estrogenlike substances on neural circuits.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12060839&dopt=Abstract

Dev Ophthalmol. 2002;35:161-8.
Steroid-induced cataract: other than in the whole animal system, in the lens culture system, androgens, estrogens and progestins as well as glucocorticoids produce a loss of transparency of the lens.

Kosano H, Nishigori H.

Faculty of Pharmaceutical Sciences, Teikyo University, Sagami-ko, Tsukui-gun, Kanagawa, Japan.

PURPOSE: To investigate the mechanism of glucocorticoid-induced cataract formation, the lenses of chick embryos were cultured with androgen, estrogen and mineralocorticoid as well as glucocorticoids. The incidence of loss of transparency induced by these steroids in the culture system and the whole body system was compared. METHODS: In the culture system, clear lenses obtained from 16-day-old chick embryos were treated with various concentrations of steroid hormones for 48 h at 37 degrees C in a humidified atmosphere containing 5% CO2. In the whole body system, these steroids dissolved in 5% acetone in water were administered to 15-day-old embryos and the lenses were isolated and visually classified on day 17. RESULTS: When 0.25 mumol of steroids were administered to 15-day-old chick embryos, only biologically active glucocorticoids such as hydrocortisone and prednisolone could cause cataract. Dexamethasone is approximately 25-fold stronger than hydrocortisone and prednisolone. Methyltestosterone as an androgen, estradiol and ethinylestradiol as estrogen, progesterone and 19-nor-ethisterone as progestin did not induce cataract formation. In the whole body system, the cataracts were caused with a dependence on the biological activity of glucocorticoids. However, other than in the whole body system, when the isolated chick lenses were cultured in the dishes, they could become opaque in the presence of testosterone, estradiol and aldosterone as well as dexamethasone and hydrocortisone at a similar dose (over 3 x 10(-5) M). CONCLUSION: These results demonstrate that the loss of transparency of cultured lens can be induced independently from biological activities of steroids. Glucocorticoids have various physiological and pharmacological activities in the living system. We assume that the steroid-induced cataract is one of the adverse effects caused by synergic biological activities of glucocorticoids.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12061274&dopt=Abstract

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