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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

Fertil Steril. 1999 Mar;71(3):536-43.
Monitoring of hormone replacement therapy in postmenopausal women by transvaginal sonography and color flow doppler: study in different phases of sequential therapy.

Exacoustos C, Lello S, Caporale E, Minghetti MC, Angelozzi D, Arduini D, Romanini C.

Department of Obstetrics and Gynecology, University of Tor Vergata, Rome, Italy.

OBJECTIVE: To assess uterine artery blood flow and endometrial thickness in postmenopausal patients receiving sequential hormone replacement therapy (HRT) at different phases of the treatment. DESIGN: Prospective controlled study. SETTING: Ultrasound and menopause units of the obstetrics and gynecology department of the University of Tor Vergata, Rome, Italy. PATIENT(S): Forty postmenopausal women were treated with cyclic sequential HRT (transdermal E2, 50 microg/d, days 1-21; and dydrogesterone, 10 mg/d, days 12-24). INTERVENTION(S): All patients underwent transvaginal color Doppler sonography in the estrogen (phase E) and progestogen (phase E/P) phases and after uterine bleeding when no hormone was administered (phase 0). MAIN OUTCOME MEASURE(S): Endometrial thickness; systolic, diastolic, and mean velocities; and pulsatility and resistance indices of the uterine arteries. RESULT(S): No statistically significant difference in endometrial thickness between phase E (6.5+/-1.6 mm) and phase E/P (6.0+/-1.7 mm) was observed. In phase 0, compared with phases E and E/P, a statistically significant decrease in endometrial thickness was found (4.1+/-1.2 mm). Doppler flow impedance parameters of uterine arteries during the different phases of the HRT cycle showed no differences between the phases considered. CONCLUSION(S): The decrease in endometrial thickness in phase 0 suggests a protective effect of our cyclic sequential regimen on the endometrium. Dydrogesterone does not interfere markedly with the vasodilatory effect of estrogen on uterine arteries.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10065794&dopt=Abstract

Endocrinology. 1999 Mar;140(3):1262-71.
E-box and cyclic adenosine monophosphate response elements are both required for follicle-stimulating hormone-induced transferrin promoter activation in Sertoli cells.

Chaudhary J, Skinner MK.

Center for Reproductive Biology, Department of Genetics and Cell Biology, Washington State University, Pullman 99164-4231, USA.

Sertoli cells are the epithelial cells responsible for the onset of pubertal development and maintenance of spermatogenesis in the adult. Transferrin is one of the major secretory products expressed by differentiated Sertoli cells. Investigation of the transcriptional control of transferrin gene expression provides insight into the regulation of Sertoli cell differentiation. Analysis of the mouse transferrin (mTf) promoter reveals the presence of a number of conserved response elements that have previously been shown to regulate cell specific expression of the human transferrin (hTf) promoter. One of these elements is the human PRII region, which is a cAMP response element (CRE)-like element that is more than 80% conserved in the mTf promoter. The activation of the hTf promoter by FSH and cAMP in rat Sertoli cells has been shown to be mediated in part through the CRE-like PRII region and binding of the CRE binding protein (CREB). The present study investigates the role of PRII in the activation of mTf promoter by FSH and cAMP in rat Sertoli cells. Mutations in the PRII of the mTf promoter reduced FSH activation by only 50% and cAMP activation by more than 90%. In contrast, the mutant PRII mTf promoter construct was fully activated by a partially purified testicular paracrine activity PModS(S300). Gel shift experiments demonstrated that proteins that can bind a consensus CRE oligonucleotide also bind the PRII region of the mTf promoter. An immunoblot confirmed that CREB binds the PRII and promotes the gel shift observed. The hypothesis developed was that another cis-acting element in addition to the CRE-like PRII is also involved in FSH actions. A conserved response element in both the mTf and hTf promoters is the basic helix-loop-helix (bHLH) responsive E-box sequence. Both FSH and PModS (S300) activity were found to promote a mTf E-box gel shift that contained the E2A gene product the bHLH protein E47. Interestingly, mutations in the E-box of the mTf promoter completely abolished the PModS(S300) activation and partially (52%) inhibited the activation by FSH. In contrast, the mutant E-box mTf promoter construct was fully activated by cAMP. Finally a double mutation of both the PRII and the E-box completely abolished FSH activation of the mTf promoter. These results suggest that optimal activation of the mouse transferrin promoter by FSH requires both CREB binding to the CRE-like PRII region and bHLH binding to the E-box. Information is provided that indicates a number of Sertoli cell promoters contain a close association of E-box and CRE-like elements. Observations are discussed in regards to the potential interactions of the CRE and E-box response elements in mediating FSH actions in Sertoli cells.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10067852&dopt=Abstract

Biochim Biophys Acta. 1999 Feb 25;1437(2):235-45.
Substrate specificity of lysophospholipase D which produces bioactive lysophosphatidic acids in rat plasma.

Tokumura A, Nishioka Y, Yoshimoto O, Shinomiya J, Fukuzawa K.

Faculty of Pharmaceutical Sciences, The University of Tokushima, Tokushima, 1-78, Shomachi 770-8505, Japan. tokumurh.tokushima-u.ac.jp

Previously we reported that lysophospholipase D in rat plasma hydrolyzes endogenous unsaturated lysophosphatidylcholines (LPCs) preferentially to saturated LPCs to lysophosphatidic acids with growth factor-like and hormone-like activities. In this study, we examined the possibility that association of LPCs with different proteins in rat plasma has an effect on the preference of lysophospholipase D for unsaturated LPCs. Large portions of various LPCs were found to be recovered in the lipoprotein-poor bottom fraction. Furthermore, the percentages of LPCs associated with albumin isolated from rat plasma were shown not to be consistent with their percentage conversions to lysophosphatidic acids by lysophospholipase D on incubation of rat plasma at 37 degrees C. These results indicate that distinct distributions of LPCs in the plasma protein fractions are not critical factors for the substrate specificity of lysophospholipase D. Experiments with Nagase analbuminemic rats suggested that albumin-LPC complexes are not necessarily required for the hydrolysis by lysophospholipase D; lipoprotein-associate LPCs appeared to be good substrates for the phospholipase. We found that both saturated and unsaturated LPCs are present mainly as 1-acyl isomers in rat plasma. This result indicates that the preference of lysophospholipase D for unsaturated LPCs is not attributable to a difference in position of the acyl group attached to the glycerol backbone of LPC. In addition, lysophospholipase D was also found to attack choline phospholipids with a long chain group and a short chain alkyl group, although their percentage hydrolyses were low. Taken altogether, these results suggest that lysophospholipase D shows higher affinities for free forms of unsaturated acyl type LPCs equilibrated with albumin-bound and lipoprotein-associated forms, than for free forms of saturated acyl type LPCs and analogs of platelet-activating factor.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10064906&dopt=Abstract

J Pediatr. 1999 Mar;134(3):324-32.
Interferons and cerebral palsy.

Grether JK, Nelson KB, Dambrosia JM, Phillips TM.

California Birth Defects Monitoring Program, California Department of Health Services, Emeryville, California, USA.

OBJECTIVE: To explore the association of neonatal interferons (IFNs) with spastic cerebral palsy (CP) and with other measured substances. STUDY DESIGN: Assays of archived neonatal blood of 31 predominantly term children with CP and 65 children in a control group were obtained by recycling immunoaffinity chromatography with laser-enhanced fluorescence and chemiluminescence detection. RESULTS: Fourteen of 31 children with spastic CP had concentrations of IFNs-alpha, beta, and gamma exceeding any control. Levels of interleukins-1, 6, 8, tumor necrosis factor-alpha, chemokines, colony stimulating factors, transforming growth factor-beta, complement components and regulators, certain neuropeptides, and thyroid hormones also differed from control levels in these 14 children. The 17 children with CP whose IFN concentrations were within the control range had levels of inflammatory cytokines higher than but near to control values; 13 of these 17 had values for coagulation factors that exceeded control values. Seven of 9 children with spastic diplegia had high IFNs, and 8 of 10 hemiplegic children had normal IFNs. CONCLUSION: Neonatal IFNs exceeding control concentrations were associated with other biochemical and clinical indicators of inflammation and with spastic diplegia. In these children with CP, IFNs within the control range were associated with concentrations of other inflammatory markers that were near to control values and with spastic hemiplegia.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10064670&dopt=Abstract

Proc Natl Acad Sci U S A. 1999 Mar 2;96(5):2514-9.
Epithelial sodium channel regulated by aldosterone-induced protein sgk.

Chen SY, Bhargava A, Mastroberardino L, Meijer OC, Wang J, Buse P, Firestone GL, Verrey F, Pearce D.

Division of Nephrology, Departments of Medicine and Cellular and Molecular Pharmacology, Box 0532, University of California, San Francisco, CA 94143, USA.

Sodium homeostasis in terrestrial and freshwater vertebrates is controlled by the corticosteroid hormones, principally aldosterone, which stimulate electrogenic Na+ absorption in tight epithelia. Although aldosterone is known to increase apical membrane Na+ permeability in target cells through changes in gene transcription, the mechanistic basis of this effect remains poorly understood. The predominant early effect of aldosterone is to increase the activity of the epithelial sodium channel (ENaC), although ENaC mRNA and protein levels do not change initially. Rather, the open probability and/or number of channels in the apical membrane are greatly increased by unknown modulators. To identify hormone-stimulated gene products that modulate ENaC activity, a subtracted cDNA library was generated from A6 cells, a stable cell line of renal distal nephron origin, and the effect of candidates on ENaC activity was tested in a coexpression assay. We report here the identification of sgk (serum and glucocorticoid-regulated kinase), a member of the serine-threonine kinase family, as an aldosterone-induced regulator of ENaC activity. sgk mRNA and protein were strongly and rapidly hormone stimulated both in A6 cells and in rat kidney. Furthermore, sgk stimulated ENaC activity approximately 7-fold when they were coexpressed in Xenopus laevis oocytes. These data suggest that sgk plays a central role in aldosterone regulation of Na+ absorption and thus in the control of extracellular fluid volume, blood pressure, and sodium homeostasis.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10051674&dopt=Abstract

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