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Microbiology. 2001 Feb;147(Pt 2):459-71.
Differential expression of mycobacterial proteins following phagocytosis by macrophages.

Monahan IM, Betts J, Banerjee DK, Butcher PD.

Department of Medical Microbiology, St George's Hospital Medical School, Cranmer Terrace, London SW17 ORE, UK.

Mycobacterium tuberculosis resides within the macrophages of the host, but the molecular and cellular mechanisms of survival are poorly understood. Recent evidence suggests that the attenuated vaccine strain Mycobacterium bovis BCG is both a deletion and regulatory mutant, yet retains both its immunoprotective and intra-macrophage survival potential. In an attempt to define M. bovis BCG genes expressed during interaction with macrophages, the patterns of protein synthesis were examined by both one- and two-dimensional gel electrophoresis of BCG while inside the human leukaemic macrophage cell line THP-1. This study demonstrated that BCG expresses proteins while resident inside macrophages that are not expressed during in vitro growth in culture media or under conditions of heat shock. Western blotting analysis revealed that some of the differentially expressed proteins are specifically recognized by human M. tuberculosis-infected sera. Proteome analysis by two-dimensional electrophoresis and MS identified six abundant proteins that showed increased expression inside macrophages: 16 kDa alpha-crystallin (HspX), GroEL-1 and GroEL-2, a 31.7 kDa hypothetical protein (Rv2623), InhA and elongation factor Tu (Tuf). Identification of proteins by such a strategy will help elucidate the molecular basis of the attenuation and the vaccine potential of BCG, and may provide antigens that distinguish infection with M. tuberculosis from vaccination with BCG.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11158363&dopt=Abstract

Arterioscler Thromb Vasc Biol. 2003 Jun 1;23(6):1060-5. Epub 2003 Apr 17.
Cross-reactive B-cell epitopes of microbial and human heat shock protein 60/65 in atherosclerosis.

Perschinka H, Mayr M, Millonig G, Mayerl C, Van Der Zee R, Morrison SG, Morrison RP, Xu Q, Wick G.

Institute for Biomedical Aging Research, Austrian Academy of Sciences, Peter-Mayr-Strasse 4b, 6020 Innsbruck, Austria. Georg.Wiceaw.ac.at

OBJECTIVE: Growing evidence suggests that immune reactions to heat shock protein 60 (HSP60) are involved in atherogenesis. Because of the high phylogenetic conservation between microbial and human HSP60, bacterial infections might be responsible for breaking the tolerance to self-HSP60, which is expressed on the surface of stressed arterial endothelial cells. METHODS AND RESULTS: We purified serum antibodies to Escherichia coli HSP60 (GroEL), the 60-kD chlamydial HSP, and HSP65 of Mycobacterium tuberculosis by affinity chromatography from clinically healthy subjects with sonographically proven carotid atherosclerosis. Reactivity of the purified antibodies with overlapping human HSP60 peptides was measured, and 8 shared common epitopes, recognized by all anti-bacterial HSP60/65 antibodies, were identified. Antisera specific for these cross-reactive epitopes were produced by immunizing rabbits with peptides derived from human HSP60. By immunohistochemistry, the epitopes were found to be present in the arterial wall of young subjects during the earliest stages of the disease. CONCLUSIONS: Antibodies to microbial HSP60/65 recognize specific epitopes on human HSP60. These cross-reactive epitopes were shown to serve as autoimmune targets in incipient atherosclerosis and might provide further insights into the mechanisms of early atherogenesis.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12702515&dopt=Abstract [PubMed - in process]

Microbiology. 2001 Feb;147(Pt 2):473-81.
A purF mutant of Mycobacterium smegmatis has impaired survival during oxygen-starved stationary phase.

Keer J, Smeulders MJ, Williams HD.

Department of Biology, Imperial College of Science, Technology and Medicine, Imperial College Road, London SW7 2AZ, UK.

In this study it was demonstrated that a range of transposon mutants of Mycobacterium smegmatis, previously described as having impaired survival in carbon-starved stationary phase, were not markedly affected in O(2)-starved stationary-phase survival. One exception was 329B, a purine auxotroph, which showed a precipitous reduction in viability from approximately 10(8) to approximately 10(3) c.f.u. ml(-1) during the first 5-10 d in O(2)-starved stationary phase. This was followed by an equally rapid recovery in culturability to a level within 10-100-fold of wild-type levels by 10-20 d into stationary phase. Transduction of the mutation into a clean genetic background demonstrated that the phenotype was due to the transposon insertion, which was shown to be in the purF gene. purF encodes phosphoribosylpyrophosphate amidotransferase, which catalyses the first committed step in purine biosynthesis. The M. smegmatis purF gene, which encodes a protein with a very high degree of similarity to the PurF homologues of Mycobacterium tuberculosis and Mycobacterium leprae, was cloned and shown to substantially complement the O(2)-starvation phenotype. The recovery in culturabilty of the purF mutant in O(2)-starved stationary phase did not involve movement of the transposon. In addition, when cells that had recovered culturability were retested, their survival kinetics in stationary phase were identical to the original culture, indicating that their recovery was not explained by the accumulation of suppressor mutations. It is concluded that the survival curve in O(2)-starved stationary phase for the purF mutant represents its true phenotype and is not a result of subsequent genetic changes in the culture. It is argued that the purF cells lose culturability for a finite period of time in stationary phase. Whether this is due to a fraction of the population dying and then regrowing using a previously undiscovered fermentation pathway, or becoming transiently dormant, or entering an active nonculturable state and subsequently undergoing resuscitation cannot be distinguished at this stage.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11158364&dopt=Abstract

Antimicrob Agents Chemother. 2001 Feb;45(2):382-92.
Inhibition of cytochrome P450 (CYP450) isoforms by isoniazid: potent inhibition of CYP2C19 and CYP3A.

Desta Z, Soukhova NV, Flockhart DA.

Division of Clinical Pharmacology, Department of Medicine, Georgetown University Medical Center, Washington, DC 20007, USA. gebreegusun.georgetown.edu

Isoniazid (INH) remains the most safe and cost-effective drug for the treatment and prophylaxis of tuberculosis. The use of INH has increased over the past years, largely as a result of the coepidemic of human immunodeficiency virus infection. It is frequently given chronically to critically ill patients who are coprescribed multiple medications. The ability of INH to elevate the concentrations in plasma and/or toxicity of coadministered drugs, including those of narrow therapeutic range (e.g., phenytoin), has been documented in humans, but the mechanisms involved are not well understood. Using human liver microsomes (HLMs), we tested the inhibitory effect of INH on the activity of common drug-metabolizing human cytochrome P450 (CYP450) isoforms using isoform-specific substrate probe reactions. Incubation experiments were performed at a single concentration of each substrate probe at its K(m) value with a range of INH concentrations. CYP2C19 and CYP3A were inhibited potently by INH in a concentration-dependent manner. At 50 microM INH (approximately 6.86 microg/ml), the activities of these isoforms decreased by approximately 40%. INH did not show significant inhibition (<10% at 50 microM) of other isoforms (CYP2C9, CYP1A2, and CYP2D6). To accurately estimate the inhibition constants (K(i) values) for each isoform, four concentrations of INH were incubated across a range of five concentrations of specific substrate probes. The mean K(i) values (+/- standard deviation) for the inhibition of CYP2C19 by INH in HLMs and recombinant human CYP2C19 were 25.4 +/- 6.2 and 13 +/- 2.4 microM, respectively. INH showed potent noncompetitive inhibition of CYP3A (K(i) = 51.8 +/- 2.5 to 75.9 +/- 7.8 microM, depending on the substrate used). INH was a weak noncompetitive inhibitor of CYP2E1 (K(i) = 110 +/- 33 microM) and a competitive inhibitor of CYP2D6 (K(i) = 126 +/- 23 microM), but the mean K(i) values for the inhibition of CYP2C9 and CYP1A2 were above 500 microM. Inhibition of one or both CYP2C19 and CYP3A isoforms is the likely mechanism by which INH slows the elimination of coadministered drugs, including phenytoin, carbamazepine, diazepam, triazolam, and primidone. Slow acetylators of INH may be at greater risk for adverse drug interactions, as the degree of inhibition was concentration dependent. These data provide a rational basis for understanding drug interaction with INH and predict that other drugs metabolized by these two enzymes may also interact.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11158730&dopt=Abstract

Antimicrob Agents Chemother. 2001 Feb;45(2):639-40.
Therapeutic potential of human neutrophil peptide 1 against experimental tuberculosis.

Sharma S, Verma I, Khuller GK.

Department of Biochemistry, Postgraduate Institute of Medical Education & Research, Chandigarh, India.

The therapeutic efficacy of human neutrophil peptide 1 (HNP-1) against experimental tuberculosis in mice on the basis of numbers of CFU has been examined. Mice infected with 1.5 x 10(4) CFU of Mycobacterium tuberculosis H(37)Rv and treated with different doses of HNP-1 injected subcutaneously exhibited significant clearance of bacilli from lungs, livers, and spleens. There were time- and dose-dependent decreases in the bacillary load in lungs, livers, and spleens of the HNP-1-treated animals compared to that in controls (untreated animals). These observations strongly suggest the therapeutic activity of HNP-1 against tuberculosis.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11158773&dopt=Abstract

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