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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

Biochem Biophys Res Commun. 2003 Jul 11;306(4):1099-105.
The first intron of the murine beta-casein gene contains a functional promoter.

Kolb A.

Molecular Recognition Group, Hannah Research Institute, Ayr, Scotland KA6 5HL, UK. kolbri.sari.ac.uk

Caseins are the major milk proteins in most mammals. Together with calcium and phosphate they form the casein micelle. The corresponding casein genes are clustered in mammalian genomes and their expression is coordinately regulated with regard to developmental and tissue specificity. Casein gene promoters are responsive to lactogenic hormones, cell-matrix, and cell-cell interactions. Transcriptional enhancer elements are found in the 5(') upstream regions of casein genes but have also been detected in the first intron of the bovine beta-casein gene. We show here that the first intron of the murine beta-casein gene has three discernible functions. First, transcriptional enhancer elements present in the intron increase the basal activity of the beta-casein promoter. In addition, these intronic enhancer elements augment the induction of the beta-casein promoter by lactogenic hormones. Finally, we demonstrate that the first intron of the murine beta-casein gene contains a functional promoter.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12821156&dopt=Abstract

Endocrinology. 1999 May;140(5):2167-72.
Agouti antagonism of melanocortin-4 receptor: greater effect with desacetyl-alpha-melanocyte-stimulating hormone (MSH) than with alpha-MSH.

Mountjoy KG, Willard DH, Wilkison WO.

Research Centre for Developmental Medicine and Biology, Department of Paediatrics, University of Auckland, New Zealand. kmountjouckland.ac.nz

Desacetyl-alpha-MSH is more abundant than alpha-MSH in the brain, the fetus, human blood, and amniotic fluid, but there is little information on its ability to interact with melanocortin receptors. The aim of this study is to compare and contrast the ability of desacetyl-alpha-MSH and alpha-MSH to couple melanocortin receptors stably expressed in HEK293 cells, to the protein kinase A (PKA) signaling pathway. Desacetyl-alpha-MSH activated mouse MC1, MC3, MC4 and MC5 receptors with EC50s = 0.13, 0.96, 0.53, and 0.84 nM, and alpha-MSH activated these receptors with EC50s = 0.17, 0.88, 1.05, and 1.34 nM, respectively. Mouse agouti protein competitively antagonized alpha-MSH and desacetyl-alpha-MSH coupling to the MC1-R similarly. In contrast, mouse agouti protein antagonized desacetyl-alpha-MSH much more effectively and potently than alpha-MSH coupling the MC4-R to the PKA signaling pathway. Furthermore, mouse agouti protein (10 nM) significantly reduced (1.4-fold) the maximum response of mMC4-R to desacetyl-alpha-MSH and 100 nM mouse agouti significantly increased (4.8-fold) the EC50. Minimal antagonism of alpha-MSH coupling mMC4-R to the PKA signaling pathway was observed with 10 nM mouse agouti, whereas both 50 and 100 nM mouse agouti appeared to reduce the maximum reponse (1.1- and 1.3-fold, respectively) and increase the EC50 (2.5- and 3.4-fold respectively). Mouse agouti protein did not significantly antagonize either alpha-MSH or desacetyl-alpha-MSH coupling mouse MC3 and MC5 receptors. Understanding the similarities and differences in activation of melanocortin receptors by desacetyl-alpha-MSH and alpha-MSH will contribute to delineating the functional roles for these endogenous melanocortin peptides.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10218968&dopt=Abstract

Neurosci Lett. 2003 Jul 17;345(2):113-6.
Glutamate receptors in the terminal nerve gonadotropin-releasing hormone neurons of the dwarf gourami (teleost).

Kiya T, Oka Y.

Misaki Marine Biological Station, Graduate School of Science, The University of Tokyo, Kanagawa 238-0225, Japan.

The terminal nerve (TN)-gonadotropin-releasing hormone (GnRH) system has been suggested to function as a neuromodulatory system that regulates the motivational state of the animal. To investigate the synaptic control of activities of the TN-GnRH neurons, we analyzed electrophysiologically the type of glutamate receptors (GluRs) in the TN-GnRH neurons. By using various specific GluR agonists and antagonists, we found that they have ionotropic GluRs (iGluR; non-NMDAR and NMDAR) and group 3 metabotropic GluRs. However, in the combined presence of supramaximal concentration of iGluR blockers in the perfusing solution and the GDPbetaS in the patch pipette, there were still residual Glu-induced depolarizing responses. These results suggest the presence of a novel type of iGluRs, in addition to the conventional GluRs, in the TN-GnRH neurons.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12821184&dopt=Abstract

Drug Alcohol Depend. 2003 Jul 20;71(1):25-35.
Neuroendocrine responses to experimentally-induced emotions among abstinent opioid-dependent subjects.

Gerra G, Baldaro B, Zaimovic A, Moi G, Bussandri M, Raggi MA, Brambilla F.

Centro Studi Farmacotossicodipendenze, Ser.T., Az. U.S.L., Via Spalato 2, 43100 Parma, Italy. ggerrusl.pr.it

The present study investigated neuroendocrine and cardiovascular changes during experimentally-induced affective states in abstinent heroin-dependent subjects and healthy controls. The procedure for eliciting emotions in all subjects used pleasant and unpleasant stimuli that did not differ in subjective arousal properties. We investigated whether the valence of the stimuli differentially affected neuroendocrine responses by comparing neutral, pleasant and unpleasant pictures on heart rate (HR), systolic (SBP) and diastolic blood pressure (DBP), methyl-OH-phenyl-glycol (MHPG), norepinephrine (NE), epinephrine (EPI), adrenocorticotrophic hormone (ACTH) and cortisol (CORT) plasma levels. Twelve abstinent heroin-dependent subjects, in comparison with 12 control subjects, were submitted to three experimental sessions, each on one of three experimental days a week apart, in counterbalanced order: day 1=unpleasant pictures, day 2=pleasant pictures, day 3=neutral pictures. In the rating of subjective arousal pleasant and unpleasant stimuli received the same high score in comparison with neutral stimuli; a different cardiovascular and neuroendocrine pattern was obtained in healthy subjects: unpleasant stimuli elicited increases in HR, SBP, MHPG, NE, ACTH, CORT, whereas neutral and pleasant stimuli did not induce any significant response in hormonal levels. In contrast, in heroin addicts, despite increased perceptions of unpleasantness, HR, SBP, MHPG and NE levels did not increase after disliked stimuli; these subjects also reported increased arousal during exposure to neutral stimuli. In comparison with controls, addicted individuals showed higher CORT and ACTH basal levels, and a consequent lack of response to unpleasant stimuli. The results indicate that neuroendocrine and cardiovascular systems respond selectively to affective, motivationally relevant stimuli, and that substance use disorders may be associated with dysregulation of emotion-processing mechanisms.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12821203&dopt=Abstract [PubMed - in process]

J Am Coll Cardiol. 2003 Jun 18;41(12):2154-63.
Growth hormone prolongs survival in experimental postinfarction heart failure.

Cittadini A, Isgaard J, Monti MG, Casaburi C, Di Gianni A, Serpico R, Iaccarino G, Sacca L.

Department of Internal Medicine and Cardiovascular Sciences, University Federico II, Naples, Italy.

OBJECTIVES: We evaluated the effects of growth hormone (GH) on survival in experimental heart failure (HF). BACKGROUND: Growth hormone has been beneficial in various models of experimental HF. Whether GH also affects HF progression and survival is not known. METHODS: A total of 119 rats with moderate myocardial infarction were randomized to receive either GH (3.5 mg/kg every other day) or placebo for 28 days. Treatment was initiated one month after coronary ligation; the follow-up lasted 13 months. In the surviving animals, Doppler echocardiography and closed-chest Millar left ventricular (LV) catheterization were performed. Apoptosis, collagen volume fraction, and capillary density in the LV zone remote from infarction were measured. The early effects of GH on apoptosis were also assessed in a subgroup of eight infarcted rats, treated as specified earlier and euthanized at one month. RESULTS: Survival rate was 68% in GH-treated rats and 48% in the placebo group (p = 0.0377). Growth hormone had no effect on myocardial architecture, systolic function, and sarcoplasmatic reticulum calcium ATPase-2 messenger ribonucleic acid. Growth hormone improved LV relaxation; this was associated with a 50% reduction in collagen volume fraction and a 27% increase in capillary density. Growth hormone reduced the apoptotic index by 50% at one month and by 33% at 13 months. CONCLUSIONS: Growth hormone prolonged survival of rats with postinfarction HF. This effect was associated with marked attenuation of cardiomyocyte apoptosis and pathologic interstitial remodeling in the surviving myocardium and enhanced LV relaxation.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12821240&dopt=Abstract

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