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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):528-35.
Expression of P450c17 messenger ribonucleic acid in postmenopausal human ovary tissues.

Jose M, Puche C, Cabero A, Cabero L, Meseguer A.

Centre d'Investigacions en Bioquimica i Biologia Molecular, Hospitals Vall d'Hebron, Barcelona, Spain.

OBJECTIVE: To investigate the expression of the P450c17 gene in postmenopausal human ovaries compared with normal cycling ovaries. DESIGN: Prospective nonrandomized clinical research study. SETTING: Servei de Medicina Reproductiva and Centre d'Investigacions en Bioquimica i Biologia Molecular, Hospitals Vall d'Hebron, Barcelona, Spain. PATIENT(S): Six premenopausal women and four postmenopausal women undergoing bilateral oophorectomy for nonovarian gynecologic disease. INTERVENTION(S): Extraction of 10 mL of peripheral venous blood for hormone measurements. Extraction of RNA from surgically removed ovaries for Northern blot, ribonuclease protection, and reverse transcriptase polymerase chain reaction Southern blot assays. MAIN OUTCOME MEASURE(S): Definition of the reproductive cycle state of each patient and determination of the level of P450c17 gene expression in all samples with the use of the semiquantitative reverse transcriptase polymerase chain reaction Southern blot assay. RESULT(S): P450c17 messenger RNA levels in postmenopausal ovaries varied considerably between samples. Although the levels were similar to those detected in the early follicular phase, one of the samples had levels as high as those observed in the late follicular phase. CONCLUSION(S): Although the degree varied from one sample to another, all the postmenopausal ovaries studied expressed the P450c17 gene at the messenger RNA level. In a sample from a patient with endometrial adenocarcinoma, the level was as high as the levels observed in the late follicular phase.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10065793&dopt=Abstract

Gen Comp Endocrinol. 1999 Mar;113(3):413-28.
Growth hormone (GH) and gonadotropin subunit gene expression and pituitary and plasma changes during spermatogenesis and oogenesis in rainbow trout (Oncorhynchus mykiss).

Gomez JM, Weil C, Ollitrault M, Le Bail PY, Breton B, Le Gac F.

Campus de Beaulieu, INRA, Rennes Cedex, 35042, France.

In order to evaluate potential interactions between somatotropic and gonadotropic axes in rainbow trout (Oncorhynchus mykiss), changes in pituitary content of the specific messenger RNA of growth hormone (GH) and gonadotropin (GTH) alpha- and beta-subunits were studied during gametogenesis with respect to pituitary and plasma hormone concentrations. Quantitative analyses of mRNA and hormones were performed by dot blot hybridization and homologous RIA on individual fish according to stage of spermatogenesis and oogenesis. All transcripts were detectable in 9-month-old immature fish. GH, GTH IIbeta, and GTH alpha increased moderately throughout most of gametogenesis and then more dramatically at spermiation and during the periovulatory period. GTH Ibeta mRNA increased first from stage I to V in males and more abruptly at spermiation, while in females GTH Ibeta transcripts increased first during early vitellogenesis and again around ovulation. Pituitary GH absolute content (microgram/pituitary, not normalized with body weight) increased slowly during gametogenesis and more abruptly in males during spermiation. In the pituitary of previtellogenic females and immature males, GTH I beta peptide contents were 80- to 500-fold higher than GTH II beta peptide contents. GTH I contents rose regularly during the initial phases of vitellogenesis and spermatogenesis and then more abruptly in the final stages of gonadal maturation, while GTH II contents show a dramatic elevation during final oocyte growth and maturation, in postovulated females, and during spermiogenesis and spermiation in males. Blood plasma GTH II concentrations were undetectable in most gonadal stages, but were elevated during spermiogenesis and spermiation and during oocyte maturation and postovulation. In contrast, plasma GTH I was already high ( approximately 2 ng/ml) in fish with immature gonads, significantly increased at the beginning of spermatogonial proliferation, and then increased again between stages III and VI to reach maximal levels ( approximately 9 ng/ml) toward the end of sperm cell differentiation, but decreased at spermiation. In females, plasma GTH I rose strongly for the first time up to early exogenous vitellogenesis, decreased during most exogenous vitellogenesis, and increased again around ovulation. Our data revealed that patterns of relative abundance of GTH Ibeta mRNA and pituitary and plasma GTH I were similar, but not the GTH II patterns, suggesting differential regulation between these two hormones at the transcriptional and posttranscriptional levels. Pituitary and plasma GH changes could not be related to sexual maturation, and only a weak relationship was observed between GH and gonadotropin patterns, demonstrating that no simple connection exists between somatotropic and gonadotropic axes at the pituitary level during gametogenesis. 1999 Academic Press.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10068502&dopt=Abstract

Brain Res. 1999 Mar 6;821(1):150-9.
Anxiety-like behavior in mice lacking the angiotensin II type-2 receptor.

Okuyama S, Sakagawa T, Chaki S, Imagawa Y, Ichiki T, Inagami T.

1st Laboratory, Medicinal Research Laboratories, Taisho Pharmaceutical, 1-403, Yoshinocho, Ohmiya 330-8530, Japan.

The main biological role of angiotensin II type 2 receptor (AT2) has not been established. We made use of targeted disruption of the mouse AT2 gene to examine the role of the AT2 receptor in the central nervous system (CNS). AT2-deficient mice displayed anxiety-like behavior compared with wild-type mice. However, AT2-deficient mice showed no depressant-like activity and no change in hexobarbital-induced sleeping time as compared with findings in wild-type mice. Both noradrenergic and corticotropin-releasing factor (CRF) neuronal systems appear to be involved in this anxiety-like behavior. Diazepam, captopril (angiotensin I converting enzyme inhibitor), prazosin (alpha1 antagonist) reversed the anxiety-like behavior in these AT2-deficient mice, whereas yohimbine (alpha2 antagonist), phenylephrine (alpha1 agonist), clonidine (alpha2 agonist), isoproterenol (beta1/beta2 agonist), propranolol (beta1/beta2 antagonist) and alpha-helical CRF9-41 (CRF receptor antagonist) has no apparent effects on anxiety-like behavior in AT2-deficient mice. In addition, concentrations of plasma adrenocorticotropic hormone (ACTH) and corticosterone in AT2-deficient mice did not differ from these in wild-type mice, hence, there are probably no endocrine abnormalities involving the hypothalamic-pituitary-adrenal axis (HPA). The amygdala appears to play an important role in many of the responses to fear and anxiety. The number of [3H]prazosin but not [125I]CRF binding sites in the amygdala was significantly reduced in AT2-deficient mice. These findings indicate that the noradrenergic system is involved in mediating the anxiety-like behavior in AT2-deficient mice. 1999 Elsevier Science B.V.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10064799&dopt=Abstract

J Biol Chem. 2003 Apr 11;278(15):12716-21. Epub 2003 Feb 04.
Purification and characterization of monolysocardiolipin acyltransferase from pig liver mitochondria.

Taylor WA, Hatch GM.

Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, Manitoba R3E 0T6, Canada.

In mammalian tissues cardiolipin is rapidly remodeled by monolysocardiolipin acyltransferase subsequent to its de novo biosynthesis (Ma, B. J., Taylor, W. A, Dolinsky, V. W., and Hatch, G. M. (1999) J. Lipid Res. 40, 1837-1845). We report here the purification and characterization of a monolysocardiolipin acyltransferase activity from pig liver mitochondria. Monolysocardiolipin acyltransferase activity was purified over 1000-fold by butanol extraction, hydroxyapatite chromatography, and preparative SDS-PAGE. The purified 74-kDa protein catalyzed acylation of monolysocardiolipin to cardiolipin with [(14)C]linoleoyl coenzyme A. Photoaffinity labeling of the protein with 12-[(4-[(125)I]azidosalicyl)amino]dodecanoyl coenzyme A indicated coenzyme A was bound at its active site and photoaffinity cross-linking of 12-[(4-azidosalicyl)amino]dodecanoyl coenzyme A to the enzyme inhibited enzyme activity. Enzyme activity was optimum at pH 7.0, and the enzyme did not utilize other lysophospholipids as substrate. The purified enzyme was heat-labile and exhibited an isoelectric point of pH 5.4. To determine the enzymes kinetic mechanism the effect of varying concentrations of linoleoyl coenzyme A and monolysocardiolipin on initial velocity were determined. Double-reciprocal plots revealed parallel lines consistent with a ping pong kinetic mechanism. When the enzyme was incubated in the absence of monolysocardiolipin, coenzyme A was produced from linoleoyl coenzyme A at a rate consistent with the formation of an enzyme-linoleate intermediate. The true K(m) value for linoleoyl coenzyme A and true K(m) value for monolysocardiolipin were 100 and 44 microM, respectively. The calculated V(max) was 6802 pmol/min per mg of protein. A polyclonal antibody, raised in rabbits to the purified protein, cross-reacted with the protein in crude pig liver mitochondrial fractions. In liver mitochondria prepared from thyroxine-treated rats, the level of the protein was elevated compared with euthyroid controls indicating that expression of monolysocardiolipin acyltransferase is regulated by thyroid hormone. The study represents the first purification and characterization of a monolysocardiolipin acyltransferase activity from any organism.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12569106&dopt=Abstract

Endocrinology. 1999 Mar;140(3):1279-84.
Regulation of growth hormone secretion by alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid receptors in infantile, prepubertal, and adult male rats.

Gonzalez LC, Pinilla L, Tena-Sempere M, Aguilar E.

Department of Physiology, Faculty of Medicine, Cordoba University, Spain.

Excitatory amino acids, such as glutamate, constitute a major transmitter system in the control of hypothalamic-pituitary function. Different subtypes of glutamate receptors, such as N-methyl-D-aspartic acid and kainate receptors, have been involved in the control of GH secretion. Other excitatory amino acid receptor subtypes, as alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA), amino-4-phosphobutyric acid, and metabotropic receptors, have been identified, yet their role in the control of neuroendocrine function remains to be completely characterized. The purpose of this study was to assess the potential involvement of AMPA receptors in the control of GH secretion. In a first set of experiments, neonatal (5 and 10 days) and prepubertal (23 days) male rats were injected with AMPA (1, 2.5, or 5 mg/kg) or the antagonist of AMPA receptors, 1,2,3,4-tetrahydro-6-nitro-2,3-dioxo-benzo(f)quinoxaline-7-sulfonamide (NBQX; 0.25 or 0.50 mg/kg). Serum GH concentrations significantly increased 15 min after i.p. administration of AMPA in both neonatal and prepubertal male rats. In addition, serum GH concentrations decreased after NBQX treatment. The stimulatory effect of AMPA was abolished by pretreatment with the blocker of nitric oxide synthase, nitro(w)-arginine-methyl ester (40 mg/kg), and was partially counteracted by the simultaneous administration of GH-releasing hormone (500 microg/kg). Moreover, AMPA was unable to elicit in vitro GH secretion by hemipituitaries from prepubertal males, pointing out that the hypothalamus is probably the site of action for the reported stimulatory action of AMPA on GH release. In a second set of experiments, the effects of AMPA and NBQX were tested in adult male rats. As in prepubertal animals, AMPA significantly increased GH secretion in adult males, whereas NBQX (20 or 40 nmol), administered through intracerebroventricular injection, induced a significant decrease in the amplitude of GH pulses. In conclusion, our data indicate that AMPA receptors have a physiological stimulatory role in the control of GH secretion in male rats throughout the life span. This effect depends on appropriate nitric oxide synthesis during the prepubertal age. In addition, AMPA receptors appear to modulate pulsatile GH secretion in adulthood.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10067854&dopt=Abstract

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