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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 Steroid Biochem Mol Biol. 1998 Dec;67(5-6):447-50.
A preliminary study of steroid reproductive hormones in human hair.

Yang HZ, Lan J, Meng YJ, Wan XJ, Han DW.

Family Planning Research Institute of Sichuan, WHO Collaborating Centre for Research in Human Reproduction, Chengdu, People's Republic of China. ascfhell.scsti.ac.cn

Nowadays research and clinical studies of human reproductive endocrinology are generally carried out using human blood reproductive hormone assays. However the acquisition of human blood samples has some shortcomings. In search of new approaches, we paid attention to the fact that progesterone can be detected in cow's hair. Consequently we investigated whether or not steroid hormones are measurable in human hair. The results showed that the levels of steroid hormones in hair are not affected by shampoo and do not significantly vary between different segments of hair (i.e. top, middle and basal segments). The menstrual estradiol and progesterone rhythm of female hair is similar to that of female serum. The ratio of hair estradiol to serum estradiol in the female is 41.2% and that of hair progesterone to serum progesterone is 59.0%; the ratio of hair testosterone to serum testosterone in male is 116%. There are significant correlations between hair and serum steroid hormones of healthy human adult: gamma (estradiol) = 0.395 (n = 20), p < 0.05; gamma (progesterone) = 0.440 (n = 22), p < 0.025 and gamma (testosterone) = 0.395 (n = 25), p < 0.05.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10030694&dopt=Abstract

Am J Kidney Dis. 1999 Feb;33(2):304-11.
Clinical course after total parathyroidectomy without autotransplantation in patients with end-stage renal failure.

Stracke S, Jehle PM, Sturm D, Schoenberg MH, Widmaier U, Beger HG, Keller F.

University of Ulm, Department of Surgery, Germany. sylvia.strackedizin.uni-ulm.de

In patients with chronic renal failure, hyperparathyroidism is a common problem and surgical parathyroidectomy (PTX) is frequently required. The three different surgical approaches are subtotal PTX, total PTX with autotransplantation, and total PTX without autotransplantation. Recurrence of hyperparathyroidism varies from 5% to 80% in different studies for the first two surgical approaches. To minimize the risk for recurrence, and because we fear severe relapses with calciphylaxia, we perform total PTX without autotransplantation. From October 1993 to October 1997, 20 patients (9 men and 11 women) underwent total PTX without autotransplantation (median age, 52 years; range, 23 to 74 years; median dialysis time before PTX, 6.5 years; range, 1 to 22 years). All patients were supplemented with vitamin D analogues postoperatively. Patients were followed up for 1 to 48 months (median, 20 months). Bone pain, when present, disappeared within the first week after total PTX. Postoperatively, most patients had temporary hypocalcemia. In the long term, five patients had asymptomatic hypocalcemia. One patient, however, repeatedly had hypocalcemic seizures. Five patients developed asymptomatic hypercalcemia when supplemented with calcitriol. At the end of the individual's observation time, parathyroid hormone (PTH) levels were less than normal in six patients, normal in seven patients, and increased in seven patients despite total PTX. We conclude that total PTX should be reconsidered an option for the treatment of hyperparathyroidism secondary to renal failure. There was no evidence of clinical bone disease after total PTX. Apparently, remaining ectopic parathyroid tissue accounts for PTH levels after total PTX.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10023643&dopt=Abstract

J Clin Endocrinol Metab. 1999 Feb;84(2):743-50.
Human peripheral blood mononuclear cells express gonadotropin-releasing hormone (GnRH), GnRH receptor, and interleukin-2 receptor gamma-chain messenger ribonucleic acids that are regulated by GnRH in vitro.

Chen HF, Jeung EB, Stephenson M, Leung PC.

Department of Obstetrics and Gynecology, National Taiwan University Hospital, Taipei.

The hypothalamic decapeptide, GnRH, plays a critical role in human reproduction. In addition to the well known effects of GnRH on pituitary cells, there is evidence supporting the presence of GnRH-binding sites in tissues other than pituitary cells, including lymphocytes. In addition, a GnRH-like substance has been found to be secreted from lymphoid cells. However, the precise nature of GnRH secretion and binding in immune cells has not been fully established. In this study, we used the RT-PCR method to examine the expression and regulation of GnRH, GnRH receptor (GnRHR), and interleukin-2 receptor gamma-chain messenger ribonucleic acids (mRNAs) in human peripheral blood mononuclear cells. It was found that human mononuclear cells expressed GnRH and GnRHR mRNAs. Nucleotide sequences of these mRNAs are identical to their hypothalamic and pituitary counterparts, respectively. In addition, GnRH and GnRHR mRNA expressions in peripheral blood mononuclear cells are regulated by GnRH and its synthetic analogs in vitro. Treatment with various concentrations of GnRH (10(-5)-10(-11) mol/L) increased GnRHR mRNA expression in a dose-dependent manner (maximal level is 158% of the untreated control value at 10(-8) mol/L GnRH; P < 0.05), but reduced GnRH mRNA levels to 69% of the untreated control value at 10(-9) mol/L GnRH (P < 0.05). Cotreatment of GnRH with a GnRH antagonist blocked these regulatory effects, indicating the receptor-mediated nature of the GnRH action. Both GnRH and GnRH agonist stimulated interleukin-2 receptor gamma-chain mRNA in a dose-dependent manner, indicating that GnRH may be involved in lymphocyte activation. In summary, these observations suggest that mRNAs encoding the pituitary form of GnRHR and the hypothalamic form of GnRH are also expressed in human peripheral blood mononuclear cells. The endogenous production of GnRH by lymphocytes may act as an autocrine or paracrine factor to regulate immune functions. Because of the presence of GnRHR on lymphocytes, exogenous GnRH analog therapy may have an impact on the immune system through these receptors.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10022447&dopt=Abstract

Biochemistry. 1999 Feb 16;38(7):1951-6.
Millisecond to microsecond time scale dynamics of the retinoid X and retinoic acid receptor DNA-binding domains and dimeric complex formation.

van Tilborg PJ, Mulder FA, de Backer MM, Nair M, van Heerde EC, Folkers G, van der Saag PT, Karimi-Nejad Y, Boelens R, Kaptein R.

Bijvoet Center for Biomolecular Research, NMR Spectroscopy Department, Utrecht University, The Netherlands.

The all-trans retinoic acid and 9-cis retinoic acid receptors (RAR and RXR, respectively) belong to a family of ligand inducible transcription factors, which exert their effect via binding to hormone response elements. Both are members of the class II sub-family of nuclear receptors, which bind DNA as dimers, on tandem repeats of a hexamer motif separated by a variable spacer. The variability in spacer length and the head-to-tail organization of the hormone response elements result in different protein-protein interactions in each of the complexes. We show that the zinc-coordinating loop regions of RXR and RAR DNA-binding domains exhibit dynamics on the millisecond to microsecond time scale. The highly dynamic second zinc finger of RXR constitutes the primary protein-protein interface in many nuclear receptor assemblies on DNA. Dynamics is also observed in the first and second zinc fingers of RAR, which are implicated in dimeric interactions with RXR on response elements with spacers of 5 base pairs and 1 base pair, respectively. The striking correspondence between the regions that exhibit conformational exchange and the dimer interfaces of the proteins complexed with DNA suggests a functional role for the dynamics. The observed flexibility may allow the proteins to adapt to various partners and with different orientations upon assembly on DNA. Furthermore, the more extensive dynamics observed for RXR may reflect the greater ability of this protein to modulate its interaction surface since it participates in a wide variety of receptor complexes.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10026278&dopt=Abstract

J Biol Chem. 1999 Feb 26;274(9):5909-18.
Molecular mechanisms of thyroid hormone-stimulated steroidogenesis in mouse leydig tumor cells. Involvement of the steroidogenic acute regulatory (StAR) protein.

Manna PR, Tena-Sempere M, Huhtaniemi IT.

Department of Physiology, Institute of Biomedicine, University of Turku, Kiinamyllynkatu 10, FIN-20520 Turku, Finland.

Using a mouse Leydig tumor cell line, we explored the mechanisms involved in thyroid hormone-induced steroidogenic acute regulatory (StAR) protein gene expression, and steroidogenesis. Triiodothyronine (T3) induced a approximately 3.6-fold increase in the steady-state level of StAR mRNA which paralleled with those of the acute steroid response ( approximately 4.0-fold), as monitored by quantitative reverse transcriptase-polymerase chain reaction assay and progesterone production, respectively. The T3-stimulated progesterone production was effectively inhibited by actinomycin-D or cycloheximide, indicating the requirement of on-going mRNA and protein synthesis. T3 displayed the highest affinity of [125I]iodo-T3 binding and was most potent in stimulating StAR mRNA expression. In accordance, T3 significantly increased testosterone production in primary cultures of adult mouse Leydig cells. The T3 and human chorionic gonadotropin (hCG) effects on StAR expression were similar in magnitude and additive. Cells expressing steroidogenic factor 1 (SF-1) showed marginal elevation of StAR expression, but coordinately increased T3-induced StAR mRNA expression and progesterone levels. In contrast, overexpression of DAX-1 markedly diminished the SF-1 mRNA expression, and concomitantly abolished T3-mediated responses. Noteworthy, T3 augmented the SF-1 mRNA expression while inhibition of the latter by DAX-1 strongly impaired T3 action. Northern hybridization analysis revealed four StAR transcripts which increased 3-6-fold following T3 stimulation. These observations clearly identified a regulatory cascade of thyroid hormone-stimulated StAR expression and steroidogenesis that provides novel insight into the importance of a thyroid-gonadal connection in the hormonal control of Leydig cell steroidogenesis.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10026215&dopt=Abstract

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