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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

Endocr J. 2003 Apr;50(2):145-53.
Role of Na+ and Ca2+ channels in the preoptic LH surge generating mechanism in proestrous rats.

Fukushima A, Sano A, Aiba S, Kimura F.

Department of Physiology, Yokohama City University School of Medicine, Yokohama 236-0004, Japan.

We studied whether Na+ and Ca2+ channels are involved in the neural mechanism responsible for the surge of gonadotropin-releasing hormone (GnRH) in proestrous rats. In experiment 1, female rats in proestrus were i.p. injected at 1345 h with pentobarbital sodium (35 mg/kg) to block spontaneous surge of LH and electrical stimulation was applied between 1400 and 1600 h to the preoptic area (POA) together with POA injection of 0.5 microl saline containing the Na+ channel blocker tetrodotoxin (TTX) at a concentration of 1 microM, 2 microM, or 5 microM. Since 5 microM TTX completely blocked the increase in serum LH concentrations evoked by the POA stimulation, we used this concentration in experiment 2 to observe the TTX effect on the spontaneous LH surge. In experiment 2, bilateral injections of 1.5 microl of 5 microM TTX at 1430 h in the POA in proestrous rats postponed the peak time and reduced the peak level of the LH surge. In experiment 3, bilateral injections of 1.5 microl of 5 microM L-type Ca2+ channel blocker nifedipine at 1430 h in the POA completely blocked the LH surge. Since the cell bodies of GnRH neurons are primarily concentrated in the POA in rats, these results suggest that both voltage-sensitive Na+ channels and Ca2+ channels contribute to the generation of action potentials at GnRH cell bodies for the surge release of GnRH.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12803234&dopt=Abstract [PubMed - in process]

Endocr J. 2003 Apr;50(2):215-9.
Functional giant parathyroid cyst with high concentration of CA19-9 in cystic fluid.

Makino T, Sugimoto T, Kaji H, Yamaguchi T, Kitazawa R, Yamauchi M, Sowa H, Chen Q, Nomura R, Tsukamoto T, Chihara K.

Division of Endocrinology/Metabolism, Neurology and Hematology/Oncology, Department of Clinical Molecular Medicine, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan.

A 63-year-old man was admitted to our hospital for the evaluation of hypercalcemia and anterior neck mass. Laboratory findings revealed hypercalcemia, hypophosphatemia, and hypercalciuria, as well as elevated serum levels of parathyroid hormone (PTH) and alkaline phosphatase. Computerized tomography and magnetic resonance images showed that the mass contained a cystic area. Parathyroid scintigraphy using either 99mTc-sestamibi alone or 201Tl-chloride in conjunction with 99mTc-pertechnetate for thyroid image subtraction showed uptake of the radioactivity into the cyst wall, suggesting that the mass originated from the parathyroid. Fine needle aspiration biopsy revealed that the cyst fluid was serous and bloody with extremely high concentrations of both PTH and CA19-9. The patient was diagnosed as primary hyperparathyroidism caused by parathyroid cyst and cervical exploration was performed. The cyst was dissected away along with the right lobe of the thyroid gland. After tumor removal, serum calcium and PTH levels were normalized. Histological study showed that the tumor possessed malignant potential with capsular invasion as well as moderate cellular atypia with trabecular pattern in arrangement. Parathyroid cells in the wall of the cystic tumor were immunostained positively for CA19-9, suggesting that CA19-9 in the cyst fluid was produced from the cells.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12803242&dopt=Abstract [PubMed - in process]

Mol Cells. 2003 Apr 30;15(2):245-55.
Cbl competitively inhibits epidermal growth factor-induced activation of phospholipase C-gamma1.

Choi JH, Bae SS, Park JB, Ha SH, Song H, Kim JH, Cocco L, Ryu SH, Suh PG.

Division of Molecular and Life Science, Pohang University of Science and Technology, Pohang 790-784, Korea.

Phospholipase C-gamma1 (PLC-gamma1) plays pivotal roles in cellular growth and proliferation through its two Src homology (SH) 2 domains and its single SH3 domain, which interact with signaling molecules in response to various growth factors and hormones. However, the role of the SH domains in the growth factor-induced regulation of PLC-gamma1 is unclear. By peptide-mass fingerprinting analysis we have identified Cbl as a binding protein for the SH3 domain of PLC-gamma1 from rat pheochromatocyte PC12 cells. Association of Cbl with PLC-gamma1 was induced by epidermal growth factor (EGF) but not by nerve growth factor (NGF). Upon EGF stimulation, both Cbl and PLC-gamma1 were recruited to the activated EGF receptor through their SH2 domains. Mutation of the SH2 domains of either Cbl or PLC-gamma1 abrogated the EGF-induced interaction of PLC-gamma1 with Cbl, indicating that SH2-mediated translocation is essential for the association of PLC-gamma1 and Cbl. Overexpression of Cbl attenuated EGF-induced tyrosine phosphorylation and the subsequent activation of PLC-gamma1 by interfering competitively with the interaction between PLC-gamma1 and EGFR. Taken together, these results provide the first indications that Cbl may be a negative regulator of intracellular signaling following EGF-induced PLC-gamma1 activation.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12803489&dopt=Abstract

Mol Cells. 2003 Apr 30;15(2):262-70.
Angiogenesis and white blood cell proliferation induced in mice by injection of a prolactin-expressing plasmid into muscle.

Ko JY, Ahn YL, Cho BN.

School of Life Science, The Catholic University of Korea, Puchon 420-743, Korea.

Prolactin (PRL) is a pituitary hormone involved in a broad spectrum of physiological processes, including lactation, development, and immune function. To further investigate the in vivo roles of PRL, rat PRL cDNA, fused to the cytomegalovirus promoter, was introduced into mouse muscle by direct injection. Prolactin mRNA and protein were detected in the muscle following injection. As a result the number of white blood cells (WBC) increased. When injection was combined with adrenalectomy there was an even greater increase. The augmentation of WBCs persisted for at least 20 days after injection of the rPRL plasmid either on its own and after injection combined with adrenalectomy. The increase in WBCs was accompanied in both cases by an increase in blood cell DNA content. We also observed an increase in heart volume, particularly of the left ventricle. Evidence of marked angiogenesis was found in the testis of rPRL- injected mice. New blood vessels were first found at 8 weeks of age and fully developed blood vessels with complex branching patterns were found after 11 weeks. When PRL fused with EGFP was introduced into mice by intramuscular injection, the EGFP localized to areas of the testis that corresponded to the sites of new blood vessel formation. PRL inhibited this binding. Taken together, our data reveal that intramuscularly expressed PRL augments WBC numbers and induces formation of new blood vessels in the testis, suggesting important roles for PRL in hematopoiesis and angiogenesis. They also indicate that direct intramuscular injection of naked DNA can be used effectively to study the function of secreted proteins, including endocrine signaling molecules.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12803491&dopt=Abstract

J Clin Invest. 1999 Apr;103(8):1119-26.
Overexpression of glycine-extended gastrin in transgenic mice results in increased colonic proliferation.

Koh TJ, Dockray GJ, Varro A, Cahill RJ, Dangler CA, Fox JG, Wang TC.

Gastrointestinal Unit, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts 02114, USA.

Gastrin is a peptide hormone involved in the growth of both normal and malignant gastrointestinal tissue. Recent studies suggest that the glycine-extended biosynthetic intermediates mediate many of these trophic effects, but the in vivo relevance of glycine-extended gastrin (G-Gly) has not been tested. We have generated mice (MTI/G-GLY) that overexpress progastrin truncated at glycine-72 to evaluate the trophic effects of G-Gly in an in vivo model. MTI/G-GLY mice have elevated serum and colonic mucosal levels of G-Gly compared with wild-type mice. MTI/G-GLY mice had a 43% increase in colonic mucosal thickness and a 41% increase in the percentage of goblet cells per crypt. MTI/G-GLY mice exhibited increased colonic proliferation compared with wild-type controls, with an expansion of the proliferative zone into the upper third of the colonic crypts. Continuous infusion of G-Gly into gastrin-deficient mice for two weeks also resulted in elevated G-Gly levels, a 10% increase in colonic mucosal thickness, and an 81% increase in colonic proliferation when compared with gastrin-deficient mice that received saline alone. To our knowledge, these studies demonstrate for the first time that G-Gly's contribute to colonic mucosal proliferation in vivo.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10207163&dopt=Abstract

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