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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 Neurotrauma. 2003 Mar;20(3):251-60.
Alpha-melanocyte-stimulating hormone is decreased in plasma of patients with acute brain injury.

Magnoni S, Stocchetti N, Colombo G, Carlin A, Colombo A, Lipton JM, Catania A.

Department of Anesthesia and Intensive Care, Ospedale Maggiore di Milano IRCCS, Milano, Italy.

The neuropeptide alpha-melanocyte-stimulating hormone (alpha-MSH) is a proopiomelanocortin derivative that has potent anti-inflammatory influences within the brain. The aim of the present research was to determine if there are changes in blood concentrations of this peptide in patients with acute traumatic brain injury (TBI) or subarachnoid hemorrhage (SAH). Concomitantly, we recorded clinical parameters and measured blood concentrations of the proinflammatory cytokine tumor necrosis factor-alpha (TNF-alpha). Twenty-three patients were enrolled in this study--18 had TBI and five SAH. Blood samples for determination of alpha-MSH and TNF-alpha were collected daily from day 1 to day 4 after injury. Baseline concentration of plasma alpha-MSH in patients with acute brain injury of either traumatic or vascular origin was significantly lower than in controls. Patients with TBI or SAH had similar alpha-MSH concentrations and the peptide remained consistently low over four post-injury days. Circulating TNF-alpha on day one was measurable in all patients and there was a negative correlation between plasma TNF-alpha and alpha-MSH. Alpha-MSH was measured again after the acute phase in eight patients. The peptide was substantially increased in all subjects except for two who had an unfavorable outcome. From the well-known protective anti-inflammatory influences of alpha-MSH in the host, reduction in this circulating peptide may have detrimental consequences in brain injury. The data raise the possibility that restoration of normal circulating alpha-MSH through administration of the peptide could be beneficial in patients with brain injury.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12820679&dopt=Abstract

Mol Cell. 2003 Jun;11(6):1575-85.
Structural basis for ligand-independent activation of the orphan nuclear receptor LRH-1.

Sablin EP, Krylova IN, Fletterick RJ, Ingraham HA.

Department of Biochemistry and Biophysics, University of California-San Francisco, San Francisco, CA 94143, USA.

The orphan nuclear receptors SF-1 and LRH-1 are constitutively active, but it remains uncertain whether their activation is hormone dependent. We report the crystal structure of the LRH-1 ligand binding domain to 2.4 A resolution and find the receptor to be a monomer that adopts an active conformation with a large but empty hydrophobic pocket. Adding bulky side chains into this pocket resulted in full or greater activity suggesting that, while LRH-1 could accommodate potential ligands, these are dispensable for basal activity. Constitutive LRH-1 activity appears to be conferred by a distinct structural element consisting of an extended helix 2 that provides an additional layer to the canonical LBD fold. Mutating the conserved arginine in helix 2 reduced LRH-1 receptor activity and coregulator recruitment, consistent with the partial loss-of-function phenotype exhibited by an analogous SF-1 human mutant. These findings illustrate an alternative structural strategy for nuclear receptor stabilization in the absence of ligand binding.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12820970&dopt=Abstract

J Hepatol. 2003 Jul;39(1):47-54.
Protective effect of central thyrotropin-releasing hormone on carbon tetrachloride-induced acute hepatocellular necrosis in rats.

Sato Y, Yoneda M, Nakamura K, Makino I, Terano A.

Second Department of Medicine, Asahikawa Medical College, Asahikawa 078-8510, Japan.

BACKGROUND/AIMS: Thyrotropin-releasing hormone (TRH) acts in the brain to stimulate hepatic proliferation and blood flow through vagal-muscarinic and prostaglandin-mediated pathways. Hepatic blood flow and prostaglandins are well recognized as cytoprotective factors for liver damage, and central TRH is known to play a role in gastric cytoprotection. The effect of central TRH on carbon tetrachloride (CCl(4))-induced acute hepatocellular necrosis was investigated in rats. METHODS: Male fasted rats were injected with either TRH analog, RX 77368 (1-10 ng), or vehicle intracisternally, and CCl(4) (2.0 ml/kg) was injected subcutaneously 60 min later. Acute hepatocellular necrosis was assessed by serum hepatic enzymes and histological changes 24 h after CCl(4). RESULTS: Intracisternal TRH dose-dependently inhibited elevation of serum alanine aminotransferase level induced by CCl(4). Intracisternal TRH reduced CCl(4)-induced hepatic histological changes. The cytoprotective effect of central TRH on CCl(4)-induced acute hepatocellular necrosis was abolished by hepatic branch vagotomy, atropine, indomethacin and N(G)-nitro-L-arginine methyl ester, but not by 6-hydroxydopamine. Intravenous TRH did not influence CCl(4)-induced acute hepatocellular necrosis. CONCLUSIONS: These results suggest that the cytoprotective effect of central TRH on acute hepatocellular necrosis is mediated through vagal-muscarinic, and prostaglandin- and nitric oxide-dependent pathways.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12821043&dopt=Abstract [PubMed - in process]

Gynecol Obstet Fertil. 2003 Apr;31(4):370-7.
[Problems raised by the gynaecologic management of women with BRCA 1 & 2 mutations]

[Article in French]

Cabaret AS, Leveque J, Dugast C, Blanchot J, Grall JY.

Departement d'obstetrique, gynecologie et medecine de la reproduction, centre hospitalier universitaire hopital Sud, 16, boulevard de Bulgarie, 35056 cedex, Rennes, France.

Breast and ovarian cancer occur more frequently in young women with BRCA 1 &2 mutations (respective cumulative risks from 37 to 85% and 10 to 20%), and raise specific gynaecologic problems as prophylactic surgery and hormonal treatments. Two medical files from 2 sisters with BRCA 1 mutation (exon 11) are presented and the authors discuss the therapeutic options chosen. BRCA 1 & 2 tumour suppressor genes seem to play a major role in the repair of cellular damages inducing by the estrogenic proliferative signal. The prophylactic mastectomy is effective for the breast cancer prevention but its acceptance is low. The oophorectomydecreases the ovarian risk (knowing the occurrence of peritoneal carcinomatosis in 1.8% of cases) and currently the breast cancer risk (RR = 0.47) by the hormonal privation: the hormone replacement therapy does not seem to increase the breast cancer risk in the small series published. The HRT is possible in women with BRCA mutation under medical supervision and if the doses of hormones are light. The first results concerning the chemoprevention by Tamoxifen are encouraging (RR = 0.38) in these patients, but more studies are needed. The oral contraception exerts an uncertain effect against ovarian cancer, but possibly enhances the breast cancer risk in this group of women (RR = 3.3).The management of women with BRCA mutation is varying according to their own priorities, which can change during their life.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12821070&dopt=Abstract [PubMed - in process]

Biochem Biophys Res Commun. 2003 Jul 11;306(4):812-8.
Involvement of activin/BMP system in development of human pituitary gonadotropinomas and nonfunctioning adenomas.

Takeda M, Otsuka F, Suzuki J, Kishida M, Ogura T, Tamiya T, Makino H.

Department of Medicine and Clinical Science, Okayama University Graduate School of Medicine and Dentistry, 2-5-1 Shikata-cho, Okayama City 700-8558, Japan.

Roles of activin/bone morphogenetic protein (BMP) system in the pathogenesis of human pituitary adenoma remain unknown although these factors stimulate follicle-stimulating hormone (FSH) secretion in the normal pituitary. Here we demonstrated that type-I and -II subunit mRNAs of activin/BMP receptors are expressed in Pit-1-negative FSH-producing (FSH-oma) and nonfunctioning pituitary adenomas (NF-oma). Basal levels of serum FSH standardized by luteinizing hormone (LH) were markedly high in FSH-omas in contrast to NF-omas. However, gonadotropin-releasing hormone (GnRH)-induced increment of FSH standardized by that of LH was not changed in FSH-omas, suggesting that imbalanced FSH secretion by FSH-oma is not attributable to GnRH regardless of the expression of GnRH receptor. Although activin betaA subunit was detected in neither adenoma, the betaB subunit was expressed highly in FSH-omas and, to lesser extent, in NF-omas. As for BMPs, BMP-6 and -7 were detected in NF-omas while BMP-4 and -15 were not detected in either type of adenoma. In the presence of pituitary activin/BMP system, the levels of co-expressing follistatin mRNA in the tumors were reduced in FSH-oma compared with NF-oma, suggesting that endogenous follistatin is involved in FSH overproduction through inhibition of activin/BMP system independently of GnRH.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12821114&dopt=Abstract

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