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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

Regul Pept. 2002 Nov 15;109(1-3):45-8.
Defects in reproductive functions in PACAP-deficient female mice.

Shintani N, Mori W, Hashimoto H, Imai M, Tanaka K, Tomimoto S, Hirose M, Kawaguchi C, Baba A.

Laboratory of Molecular Neuropharmacology, Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Japan.

Pituitary adenylate cyclase-activating polypeptide (PACAP) is a highly conserved neuropeptide and widely expressed in both brain and peripheral tissues, including several reproductive organs (e.g., testis and ovary). PACAP stimulates syntheses of several sexual hormones and steroids, suggesting it has possible roles in reproductive function. In this study, the role of PACAP in female reproductive functions such as fertility, mating behavior and maternal behaviors were investigated by using mice lacking PACAP (PACAP(-/-)). PACAP(-/-) females showed reduced fertility (the number of parturitions relative to the number of pairings). Mating experiments using vasectomized males revealed that mating frequency and its intervals in some PACAP(-/-) females were quite different (zero to eight times/4 weeks), whereas the frequency was relatively constant (two to three times/4 weeks) in wild-type females. In PACAP(-/-) females, maternal crouching behavior tended to decrease compared to wild-type females, although the influence of litter size on maternal behavior needs to be considered. These data suggest a role for endogenous PACAP in female reproductive processes.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12409213&dopt=Abstract

Regul Pept. 2002 Nov 15;109(1-3):115-25.
PAC1 and PACAP expression, signaling, and effect on the growth of HCT8, human colonic tumor cells.

Le SV, Yamaguchi DJ, McArdle CA, Tachiki K, Pisegna JR, Germano P.

CURE: Digestive Diseases Research Center, VA Greater Los Angeles Healthcare System, University of California, Los Angeles 90073, USA.

The pituitary adenylate cyclase-activating polypeptide (PACAP) type 1 receptor (PAC1) is a heptahelical, G protein-coupled receptor that has been shown to be expressed by non-squamous lung cancer and breast cancer cell lines, and to be coupled to the growth of these tumors. We have previously shown that PACAP and its receptor, PAC1, are expressed in rat colonic tissue. In this study, we used polyclonal antibodies directed against the COOH terminal of PAC1, as well as fluorescently labeled PACAP, Fluor-PACAP, to demonstrate the expression of PAC1 on HCT8 human colonic tumor cells, using FACS analysis and confocal laser scanning microscopy. Similarly, anti-PACAP polyclonal antibodies were used to confirm the expression of PACAP hormone by this cell line. We then investigated the signal transduction properties of PAC1 in these tumor cells. PACAP-38 elevated intracellular cAMP levels in a dose-dependent manner, with a half-maximal (EC(50)) stimulation of approximately 3 nM. In addition, PACAP-38 stimulation caused an increase in cytosolic Ca(2+) concentration [Ca(2+)](i), which was partially inhibited by the PACAP antagonist, PACAP-(6-38). Finally, we studied the potential role of PACAP upon the growth of these tumor cells. We found that PACAP-38, but not VIP, increased the number of viable HCT8 cells, as measured by MTT activity. We also demonstrated that HCT8 cells expressed the Fas receptor (Fas-R/CD95), which was subsequently down-regulated upon activation with PACAP-38, further suggesting a possible role for PACAP in the growth and survival of these tumor cells. These data indicate that HCT8 human colon tumor cells express PAC1 and produce PACAP hormone. Furthermore, PAC1 activation is coupled to adenylate cyclase, increase cytosolic [Ca(2+)](i), and cellular proliferation. Therefore, PACAP is capable of increasing the number of viable cells and regulating Fas-R expression in a human colonic cancer cell line, suggesting that PACAP might play a role in the regulation of colon cancer growth and modulation of T lymphocyte anti-tumoral response via the Fas-R/Fas-L apoptotic pathway.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12409223&dopt=Abstract

FASEB J. 2002 Nov;16(13):1721-31.
Insulin-like growth factor binding protein 2 (IGFBP-2) separates hypertrophic and hyperplastic effects of growth hormone (GH)/IGF-I excess on adrenocortical cells in vivo.

Hoeflich A, Weber MM, Fisch T, Nedbal S, Fottner C, Elmlinger MW, Wanke R, Wolf E.

Institutes of Molecular Animal Breeding/Gene Center, Ludwig-Maximilian University, Munich, Germany.

GH and IGF-I are capable of inducing cellular hypertrophy and/or hyperplasia. Chronic overexpression of GH in transgenic mice results in systemically and locally increased IGF-I levels and in disproportionate overgrowth, including adrenocortical enlargement and corticosterone hypersecretion. Using PEPCK-bovine GH transgenic (G) mice, we demonstrate that adrenal enlargement involves both hypertrophy (44%) and hyperplasia (50%) of zona fasciculata cells. To clarify whether IGFBP-2 affected cell volume and number, we crossed hemizygous G mice with hemizygous CMV-IGFBP-2 transgenic (B) mice, generating G mice, B mice, GB double transgenic mice, and nontransgenic controls (C). The absolute weight of the adrenal glands was significantly increased in 5-wk- and 4-month-old G mice vs. C and B mice. IGFBP-2 overexpression in GB mice reduced this effect of GH excess by 26% and 37% in 5-wk- and 4-month-old animals, respectively. GH-induced hypertrophy of zona fasciculata cells was completely abolished by IGFBP-2 overexpression in GB mice whereas hyperplasia was not affected. Basal and ACTH-induced plasma corticosterone levels of 4-month-old G mice, but not of GB mice, were two- to threefold increased compared with C mice. Plasma ACTH levels were similar in all groups. Our data show that IGFBP-2 potently separates hypertrophic and hyperplastic effects of GH/IGF-I excess on adrenocortical cells.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12409314&dopt=Abstract

Nucleic Acids Res. 2002 Nov 1;30(21):4709-19.
Translational fusions with the engrailed repressor domain efficiently convert plant transcription factors into dominant-negative functions.

Markel H, Chandler J, Werr W.

Institut fur Entwicklungsbiologie Universitat zu Koln, 50923 Koln, Germany.

Evidence is provided that plant transcription factors can be efficiently reprogrammed to dominant- negative functions by the use of a repressor domain of the engrailed (en) gene from Drosophila. Ectopic expression of translational fusions between the en(298) N-terminus and the complete coding regions of the SHOOTMERISTEMLESS, APETALA3, PISTILLATA and KNAT1 transcription factors results in trans-dominant functions which phenocopy loss-of-function mutants. The combination of the dominant-negative en(298)-STM function with the hormone-binding domain of the glucocorticoid receptor provides strong evidence that phenocopies rely on the incorporation of the chimeric protein into the nuclear compartment. By this dominant-negative approach KNAT1 was rapidly identified to be encoded by the BREVIPEDICELLUS locus. Dominant-negative chimeric proteins may be of wide use to elucidate biological functions of plant transcriptional activators and may be suitable to study protein-protein interactions in planta.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12409462&dopt=Abstract

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Breast tissue in newborn infants is considered to be physiologic and mainly related to exposure to maternal hormones in utero or through breast-feeding. However, controversy exists as to whether breast tissue in later infancy is under the influence of endogenous hormones. Children at 2-4 mo of age have a surge of reproductive hormones, including estradiol, which may affect the mammary gland. In a prospective cohort study of 1126 healthy, 3-mo-old infants, breast tissue size and reproductive hormones were measured. We found that palpable breast tissue (diameter >or=3 mm) is a common physiologic condition present in 78.9% of children, significantly more frequent (p < 0.001) and larger (p < 0.001) in girls than in boys. Girls had significantly higher median estradiol levels than boys (30.0 versus 21.0 pmol/L, p < 0.001). In a multiple regression model including breast tissue size given as quartiles as the dependent variable and weight for gestational age, subscapular skinfold, weight at 3 mo of age and serum estradiol as independent variables, a gender difference was shown. In girls, the estradiol level was positively (p < 0.03) correlated to breast quartile. In boys, no correlations were found. Whether the stimulation of the mammary gland in infancy represents a developmental window that is of biologic significance for breast development and pathology in adulthood remains to be defined.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12409513&dopt=Abstract

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