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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

Arterioscler Thromb Vasc Biol. 1999 Apr;19(4):854-61.
Modified LDL-mediated increases in endothelial layer permeability are attenuated with 17 beta-estradiol.

Gardner G, Banka CL, Roberts KA, Mullick AE, Rutledge JC.

Division of Cardiovascular Medicine, University of California, Davis, USA.

-Current research suggests that estrogen may have primary effects on the artery wall. To investigate the mechanisms of female sex hormone actions in the artery wall, we used an isolated, perfused, rat carotid artery model to examine the effects of estradiol on the rates of accumulation of normal (N-LDL) and minimally modified (MM-LDL) low density lipoprotein in ovariectomized rats. N-LDL, MM-LDL, and oxidized LDL (OX-LDL) were fluorescently labeled and perfused into individual arteries. The rate of LDL accumulation was measured by quantitative fluorescence microscopy before and after treatment with estradiol (1 nmol/L, 272 pg/mL). Estradiol had no effect on the rate of N-LDL accumulation (45+/-12 versus 48+/-15 ng cholesterol per cm2 per h). However, estradiol significantly decreased the rate of MM-LDL (240+/-48 versus 160+/-48 ng cholesterol per cm2 per h; P<0.05) and OX-LDL (191+/-53 versus 112+/-36 ng cholesterol per cm2 per h; P<0.05) accumulation. Further experiments showed that perfusion of unlabeled MM-LDL (100 microgram/mL) increased endothelial layer permeability when the rate of accumulation of a water-soluble, fluorescently labeled, reference molecule (64 000-molecular weight dextran) was determined before and after perfusion of MM-LDL (319+/-96 versus 510+/-191 ng per cm2 per h, n=6 arteries; P<0.05). Estradiol prevented the expected increase in the rate of dextran accumulation when perfused with MM-LDL (control, 415+/-49 ng per cm2 per h and MM-LDL+estradiol, 415+/-160 ng per cm2 per h). Our studies show that estradiol prevents compromise of the endothelial barrier mediated by MM-LDL and attenuates accumulation of MM-LDL in the artery wall.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10195909&dopt=Abstract

J Nucl Med. 2002 Nov;43(11):1482-8.
A retrospective review of the effectiveness of recombinant human TSH as a preparation for radioiodine thyroid remnant ablation.

Robbins RJ, Larson SM, Sinha N, Shaha A, Divgi C, Pentlow KS, Ghossein R, Tuttle RM.

Endocrinology Service, Department of Medicine, Memorial Hospital for Cancer and Allied Diseases, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA. robbinsskcc.org

Radioiodine remnant ablation (RRA) is frequently used after a thyroidectomy for differentiated thyroid carcinoma because it has been reported to reduce the number of local recurrences and to increase overall survival. Although the traditional method of preparation for RRA is thyroid hormone withdrawal, several physicians at our medical center have offered the option of having RRA after preparation by recombinant human thyroid-stimulating hormone (thyrotropin; TSH) over the past 2 y. During this same time period, other patients at our center were prepared for RRA by hormone withdrawal. METHODS: We took this opportunity to retrospectively review the rate of complete remnant ablation in patients having RRA after hormone withdrawal compared with those having RRA after recombinant human TSH. Only patients who had RRA after January 1, 1999, and follow-up diagnostic studies at our medical center, were included in the analysis. A successful ablation was defined as no visible radioiodine uptake on the follow-up diagnostic scans, performed with 185 MBq (5 mCi) (131)I. The 2 groups had comparable patient and tumor characteristics and received similar ablative activities of (131)I. RESULTS: We found that 84% of those prepared by recombinant human TSH, and 81% of those prepared by hormone withdrawal, had complete resolution of visible thyroid bed uptake after RRA (P = not significant). CONCLUSION: Given the biases that exist in retrospective studies, we cannot yet recommend RRA preparation by recombinant human TSH for routine use. However, these preliminary findings are favorable enough to support the design of a prospective randomized trial comparing RRA success rates after preparation by either thyroid hormone withdrawal or recombinant human TSH.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12411552&dopt=Abstract

Neuroendocrinology. 2002 Oct;76(4):193-202.
Role of gamma-aminobutyric acid neurons in the release of gonadotropin-releasing hormone in cultured rat embryonic olfactory placodes.

Funabashi T, Daikoku S, Suyama K, Mitsushima D, Sano A, Kimura F.

Department of Physiology, Yokohama City University School of Medicine, Yokohama, Japan.

We recently established a primary cell culture system of gonadotropin-releasing hormone (GnRH) neurons originating from olfactory placodes of rat embryos at E13.5 and showed that cultured olfactory placodes released GnRH into the medium in a pulsatile fashion with an interpulse interval of about 30 min. Since the reported presence of gamma-aminobutyric acid (GABA) neurons in the culture of rat olfactory placode raises questions as to the role played by these GABA neurons in the GnRH pulse generation, we immunostained GnRH neurons and GABA neurons in this culture system to examine the interrelationship between both types of neurons, and determined the effects of GABA and the GABA(A) receptor antagonist, bicuculline, on GnRH release. The immunohistochemical study showed that GnRH neurons received fiber terminals from GABA neurons. GnRH neurons in culture released GnRH into the medium at intervals of 30-40 min, confirming our previous study. Treatment with 20 microM GABA prolonged the interpulse interval and decreased the amplitude of GnRH pulses. Bicuculline administered at 20 microM did not affect either parameter, but 50 microM bicuculline elevated the mean GnRH level, although it did not affect either the interpulse interval or the amplitude of GnRH pulses. In addition, 50 microM bicuculline increased the mean trough levels of GnRH pulses, although 20 microM bicuculline did not. In light of the in vivo studies performed previously, we suggest that the GnRH pulse generator, which probably consists of a small population of GnRH neurons in the culture, does not involve GABA neurons to generate the pulsatile GnRH release, although it may be responsive to the inhibitory transmitter GABA. We also found that there may be another population of GnRH neurons in the culture whose activity is strongly suppressed by the tonic inhibition of GABA neurons. Although it is speculative, these latter GnRH neurons may be responsible for the surge of GnRH release. 2002 S. Karger AG, Basel

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12411736&dopt=Abstract

Neuroendocrinology. 2002 Oct;76(4):203-13.
Tamoxifen but not other selective estrogen receptor modulators antagonizes estrogen actions on luteinizing hormone secretion while inducing gonadotropin-releasing hormone self-priming in the rat.

Sanchez-Criado JE, Guelmes P, Bellido C, Gonzalez M, Hernandez G, Aguilar R, Garrido-Gracia JC, Bello AR, Alonso R.

Department of Cell Biology, Physiology and Immunology, University of Cordoba, Spain. filsacrucano.uco.es

Selective estrogen receptor modulators (SERMs) are compounds which may function as agonists or antagonists depending upon the target tissue. This study compares the actions of different SERMs on luteinizing hormone (LH) secretion, and on gonadotropin-releasing hormone (GnRH) self-priming in the rat. To do this, 4-day cyclic rats were injected twice, on day 2 (metestrus) and day 3 of the estrous cycle, with one of the following SERMs: 0.25 mg ICI 182,780, 3 mg tamoxifen (TX), LY139481-HCl or LY117018-HCl, or 0.5 mg RU58668. Control rats were given subcutaneous injections of 0.2 ml oil. On the morning of day 4 (proestrus in controls), rats from each group were either injected intraperitoneally with pentobarbital (40 mg/kg) for in vivo study or decapitated and their pituitaries collected for incubation (in vitro study). Additionally, pituitaries taken on each day of the estrous cycle from control rats as well as on day 4 from SERM-treated rats were processed for immunohistochemical determination of the estrogen receptor-alpha (ERalpha) gonadotrope. The plasma concentration or accumulation of LH in the medium was determined after 1 h (basal secretion). Thereafter, an intravenous bolus of GnRH (50 ng/0.5 ml/100 g BW) or 10(-8) M GnRH was injected or added to the medium, respectively. After 1 h of GnRH exposure, blood or medium were taken, and another challenge of GnRH was made. At the end of the 3rd h of the experiment, blood or medium samples were taken again and the LH plasma concentration or accumulation in the medium were determined. All SERM treatments reduced uterus weight and decreased basal and stimulated LH secretion. Also, on day 4, rats treated with any SERM other than TX showed vaginal smears infiltrated by leukocytes and a reduction in GnRH self-priming. TX-treated rats exhibited cornified vaginal smears and an estrogenic effect on GnRH self-priming. Moreover, 15-min exposure to two consecutive GnRH (10(-8) M) challenges 1 h apart in incubated pituitaries with estradiol (E(2), 10(-8) M), TX (10(-7) M), E(2) + TX, or medium alone form ovariectomized rats injected for 3 days with estradiol benzoate (25 microg), TX (3 mg), estradiol benzoate + TX, or 0.2 ml oil, respectively, showed that TX increased GnRH self-priming, as did E(2), whereas it reduced the E(2)-sensitizing effect on GnRH-stimulated LH secretion and cancelled the E(2)-dependent GnRH self-priming. All SERMs prevented the physiological nucleocytoplasmic shuttling of ERalpha exhibited during proestrus in control rats, and TX, in addition, induced a significantly larger number of gonadotropes displaying strong cytosolic immunosignals corresponding to ERalpha than the rest of the experimental groups. Overall, data from this study indicated that, in contrast to the general antagonistic effect of the tested SERMs, TX seemed to display both selective agonist and antagonist activity at the gonadotrope level and on GnRH self-priming of LH secretion respectively. 2002 S. Karger AG, Basel

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12411737&dopt=Abstract

Neuroendocrinology. 2002 Oct;76(4):235-42.
Estrogen modulation of mu-opioid receptor-stimulated [35S]-GTP-gamma-S binding in female rat brain visualized by in vitro autoradiography.

Acosta-Martinez M, Etgen AM.

Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY, USA.

The mu-opioid receptor (OR) is involved in several aspects of female reproductive neuroendocrinology, such as the control of gonadotropin release and the display of lordosis behavior. Even though the neuroendocrine events modulated by mu-ORs are steroid hormone-dependent, few studies have shown how steroid hormones such as estrogen and/or progesterone can affect mu-OR function. Therefore, the present study investigated if in vivo estrogen or estrogen plus progesterone treatment of ovariectomized (OVX) rats affects mu-OR coupling to its G proteins. We used autoradiographic analysis of agonist-stimulated [(35)S]-GTPgammaS binding, in which brain sections were incubated in the presence or absence of the mu-OR agonist [D-Ala(2), N-Me-Phe(4), Gly(2)ol]-enkephalin (DAMGO). Film images were quantified using calibrated [(14)C] standards. Analysis was performed in steroid-responsive hypothalamic regions such as the medial preoptic area (mPOA) and the ventromedial nucleus of the hypothalamus, as well as in non-hypothalamic brain regions. Treatment with estrogen, alone or with progesterone, significantly increased DAMGO-stimulated [(35)S]-GTPgammaS binding in the mPOA when compared to control OVX animals. In addition, estrogen increased mu-OR coupling in the caudate putamen. Steroid treatment had no effect on either basal or DAMGO-stimulated binding in the other brain regions examined. These findings suggest that estrogen modulates mu-OR function in a brain region-specific fashion. This could have important implications in terms of how these hormones synchronize reproductive behavior and gonadotropin release. 2002 S. Karger AG, Basel

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12411740&dopt=Abstract

Hair loss is a problem in modern soceity. Examining the factors of hair growth may shed light on how hair loss might occur. How long can hair grow before it stops growing eventually if it does? Given that the hair growth rate is quite uniform and constant, somewhere between 0.3-0.5 millimeters per day, it's believed that the length of anagen, the growth phase, differs among individuals, and this is the major determinant to the maximum hair length. For some individuals, anagen may last ten years. Of course the length of the anagen is governed by genes, and the genetic background of the individuals. Non-genetic factors such as nutritional condition, weather, seasonal changes (hair may grow a bit faster during winter), taking medications, health condition may of course influence the rate of hair growth as well as hair loss. The shape of the hair, straight or curly, is dependent on the shape of the follicle. A circular or round hair follicle would generate straight hair, while the follicle with oval or elliptical shapes (in its cross-section) would produce a curly hair.

DHEA is a natural hormone, and it is produced in our body by the adrenal glands. DHEA has been suggested to provide numerous potential benefits. DHEA (or dehydroepiandrosterone) is converted into androgens (male hormones) or estrogens (female hormones) in the cells.

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