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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

Teratology. 2002 Dec;66(6):300-8.
Effect of sera from women with systemic lupus erythematosus or antiphospholipid syndrome and recurrent abortions on human placental explants in culture.

Yacobi S, Ornoy A, Blumenfeld Z, Miller RK.

Laboratory of Teratology, Department of Anatomy and Cell Biology, Hebrew University Hadassah Medical School, Jerusalem 91120, Israel.

BACKGROUND: Systemic lupus erythematosus (SLE) with or without evidence of antiphospholipid antibodies (aPA) and antiphospholipid syndrome (APS) is associated with a high rate of spontaneous abortions. The placenta is thought to be the site of pathological damage in many of these abortions. To test this hypothesis, we studied the effects of sera obtained from women with SLE with or without treatment on human placental explants in culture. METHODS: We cultured 5.5- to 7.5-week-old human placental explants in a culture medium containing F-12 DMEM and 10% FCS or in 90% human serum obtained from nonpregnant women with SLE prior to or after treatment. Culture was carried out for 96 hr. At the end of the culture period, we studied the secretion of the placental hormones estrogen (E2), progesterone (PGN), and human chorionic gonadotropin (hCG). In addition, we studied the proliferation rate (using PCNA staining) and the rate of apoptosis (using ApoTag) of the trophoblastic cells. RESULTS: Placentae grew better in normal human serum than in a chemically defined medium of F-12 DMEM and 10% FCS. Enhanced growth and higher secretion rates for hCG and estradiol (E2) were manifested in placentae cultured in control sera with no change in PGN secretion. Secretion rates of hCG and PGN (but not of E2 in the treated group) by placental explants were similar to that of controls. However, the serum levels prior to culture were not measured. Further, explants in serum from untreated women with SLE produced a significant decrease in the proliferation rate of the trophoblastic cells and an increase of apoptosis. Treatment significantly reduced the apoptotic rate and increased cell proliferation, but the cell proliferation rate was still lower than that noted in controls. CONCLUSIONS: We conclude that sera from women with SLE may directly damage the developing placenta reducing proliferation and enhancing apoptosis. Successful treatment of the women reduces that damage. 2002 Wiley-Liss, Inc.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12486763&dopt=Abstract

Endocr J. 1999 Mar;46 Suppl:S67-9.
The involvement of growth hormone-binding protein in altered GH-IGF axis in IDDM.

Kobayashi K, Amemiya S, Kobayashi K, Sawanobori E, Mochizuki M, Ishihara T, Higashida K, Miura M, Nakazawa S.

Department of Pediatrics, Yamanashi Medical University, Japan.

High GH and low IGF-I are well known in IDDM patients. To delineate this altered GH-IGF-I axis in IDDM, we investigate the role of GH-binding protein (GHBP) in relation to the metabolic and nutritional states. Materials and Methods: Forty seven patients with IDDM, mean 13.7 years, were evaluated. Blood samples were obtained before insulin injection and breakfast to test for plasma glucose (PG), IGF-I, IGFBP-1, IGFBP-3, total and complex GHBP (tGHBP and cGHBP), and HbA1c. Urine samples were collected in the morning for urinary GH (uGH). The difference between tGHBP and cGHBP is defined as fGHBP. The levels of PG and HbA1C were not correlated with each level of tGHBP, cGHBP, fGHBP or uGH. The levels of tGHBP, cGHBP and fGHBP were not all correlated with uGH. Both the levels of IGF-I and body mass index (BMI) were positively correlated with fGHBP. The duration of IDDM was negatively correlated with tGHBP, cGHBP and fGHBP. Discussion: As the previous report of the relationship between GH binding reserve to GHBP and IGF-I or BMI in non-diabetic subjects, fGHBP again showed statistical links with these parameters in IDDM. We therefore suggest that GHBP, especially its free form, may reflect a malmetabolic state of IDDM liver, resulting in an altered GH-IGF-I axis.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12054124&dopt=Abstract

J Bone Miner Res. 2002 Jun;17(6):1034-43.
Leptin acts as a growth factor on the chondrocytes of skeletal growth centers.

Maor G, Rochwerger M, Segev Y, Phillip M.

Department of Morphology Science, Rappaport Faculty of Medicine, Technion, Haifa, Israel.

Childhood obesity frequently is associated with an increase in height velocity and acceleration of epiphyseal growth plate maturation despite low levels of serum growth hormone (GH). In addition, obesity is associated with higher circulating levels of leptin, a 16-kDa protein that is secreted from the adipocytes. In this study, we evaluated the direct effect of leptin on the chondrocyte population of the skeletal growth centers in the mouse mandibular condyle, a model of endochondral ossification. We found that chondrocytes in the growth centers contain specific binding sites for leptin. Leptin, at a concentration of 0.5-1.0 microg/ml, stimulated in a dose-dependent manner the width of the chondroprogenitor zone (up to 64%), whereas higher concentrations had an inhibitory effect. Leptin induction of both proliferation and differentiation activities in the mandibular condyle was confirmed by our findings of an increase in bromodeoxyuridine (BrdU) incorporation into DNA and in (acidic) Alcian blue (AB) staining of the cartilaginous matrix. Leptin also increased the abundance of the insulin-like growth factor (IGF) I receptor and IGF-I receptor messenger RNA (mRNA) within the chondrocytes and the progenitor cell population. Our results indicate that leptin acts as a skeletal growth factor with a direct peripheral effect on skeletal growth centers. Some of its effects on the growing bone may be mediated by the IGF system via regulation of IGF-I receptor expression. We speculate that the high circulating levels of leptin in obese children might contribute to their growth.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12054158&dopt=Abstract

Arch Biochem Biophys. 2002 Apr 15;400(2):180-7.
Diastereomeric ecdysteroids with a cyclic hemiacetal in the side chain produced by cytochrome P450 in hormonally resistant insect cells.

Kayser H, Ertl P, Eilinger P, Spindler-Barth M, Winkler T.

Syngenta Crop Protection AG, Research and Technology, WRO-1060.4.04, CH-4002 Basel, Switzerland. harmut.kayseyngenta.com

A microsomal cytochrome P450 from a cell line of the insect Chironomus tentans has been shown to hydroxylate the steroid hormone 20-hydroxyecdysone at C(26) to yield 20,26-dihydroxyecdysone, P1, which is further metabolized to P2 and P3. Based on (1)H NMR studies, acetonide formation and quantum chemical calculations, P2 and P3 represent novel slowly interconvertible geometrical isomers, occurring at a 3:1 ratio, presumably arising from hemiacetal formation between the 26-aldehyde group and the 22R-hydroxyl group to build a tetrahydropyran ring in the side chain. The stereochemistry at C(26) was S in P2 (trans-diol) and R in P3 (cis-diol), respectively. Both metabolites showed S configuration at C(25). With Chironomus cells, P2/P3 was inactive as both a hormonal agonist and antagonist, whereas 20,26-dihydroxyecdysone (P1) showed weak agonist activity. Thus, cytochrome P450-mediated inactivation of 20-hydroxyecdysone may be responsible for the hormonal insensitivity observed in some subclones of this cell line.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12054428&dopt=Abstract

Anal Biochem. 2002 Jun 15;305(2):260-8.
A melanocyte-keratinocyte coculture model to assess regulators of pigmentation in vitro.

Lei TC, Virador VM, Vieira WD, Hearing VJ.

Pigment Cell Biology Section, Laboratory of Cell Biology, Bethesda, Maryland 20892, USA.

Many melanocyte or skin equivalent models have been used to evaluate the potential efficacy of melanogenic compounds to regulate pigmentation, but there has been great variation in results, partially stemming from the use of different cell lines and diverse conditions for the melanogenic assays. In an earlier report, we optimized a microtiter format assay system to screen potential bioactive compounds using immortalized melan-a melanocytes. That assay system, termed the STOPR protocol, allowed effects on melanocyte proliferation and differentiation to be assessed in a highly sensitive, reproducible, and cost-effective manner. However, in the skin and hair, melanocytes interact with keratinocytes, fibroblasts, and other cell types, and testing of putative bioactive compounds on melanocytes alone in culture does not allow one to observe the interactions with those other cell types, such as would occur in vivo. Therefore, we developed a melanocyte-keratinocyte coculture protocol that allows testing of compounds for potential effects on pigmentation in a more physiologically relevant context. It is a sensitive, reproducible, and reliable model for testing melanogenic regulators, and we have standardized it with known melanogenic inhibitors (hydroquinone, arbutin, kojic acid, and niacinamide) and stimulators (alpha-melanocyte-stimulating hormone, 8-methoxypsoralen, and 3,4-dihydroxyphenylalanine). This coculture system allows for large-scale screening of candidate compounds in conjunction with the STOPR protocol and provides a more physiologically relevant system to study melanocyte-keratinocyte interactions and to elucidate the regulatory mechanisms of melanogenic compounds. 2002 Elsevier Science (USA).

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12054455&dopt=Abstract

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