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Anticancer Res. 2000 Sep-Oct;20(5A):3059-66.
In vitro effects of fenretinide on cell-matrix interactions.

Vaccari M, Silingardi P, Argnani A, Horn W, Giungi M, Mascolo MG, Grilli S, Colacci A.

Istituto Nazionale per la Ricerca sul Cancro, Genova-Biotechnology Satellite Unit, Bologna, Italy. m.vaccarstbiotech.it

BACKGROUND: Understanding the molecular basis of the metastatic spread of cancer and the underlying mechanisms is crucial for the development and appropriate clinical use of novel therapeutic agents directed at prevention of metastasis. Retinoids have been reported to inhibit cell proliferation, modulate cell differentiation, enhance apoptosis and to prevent the conversion of in situ cancer to locally invasive malignancy by suppressing the invasive process as well as by inhibiting angiogenesis. Fenretinide (4-HPR), a synthetic derivative of retinoic acid, is less toxic than natural retinoids and is active in the prevention and treatment of a variety of tumours in animal models. Its efficacy in cancer chemoprevention and therapy has been investigated in clinical trials. MATERIALS AND METHODS: In order to evaluate the effects of 4-HPR on the late stages of tumour progression, chemically transformed BALB/c 3T3 cells, showing a fully malignant phenotype, were exposed to 4-HPR (0.25-10 microM; 72 hours pre-treatment) and then analysed for in vitro invasive ability. The possible mechanisms of action responsible for the anti-invasive activity of 4-HPR were investigated, analysing cellular adhesion, motility, and proteolytic capability. RESULTS: Data showed that 4-HPR significantly inhibited the invasive phenotype of chemically transformed cells; the reduction in Matrigel invasion was dose-dependent and seemed not to be related to cytotoxic effects or reduction in cell proliferation rates induced by 4-HPR assayed doses. The 4-HPR-induced decrease in chemotactic motility of transformed cells correlated well with the invasion inhibition. 4-HPR, at active concentrations, differently affected cell adhesion to the extracellular matrix, depending on the coating substrate used (laminin, collagen IV, fibronectin and vitronectin). 4-HPR treatment significantly enhanced cell adhesion to laminin, while reducing cell-vitronectin attachment. It did not modify the attachment of the cells to fibronectin and collagen IV. Zymographic analysis failed to demonstrate 4-HPR involvement in the modulation of the activity and expression of gelatine degrading enzymes. CONCLUSION: These data suggest that 4-HPR inhibits tumour cell invasion through a basement-like matrix, by suppressing chemotactic motility and by altering cell-matrix interactions.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11062723&dopt=Abstract

J Korean Med Sci. 2000 Oct;15(5):533-41.
Dehydroepiandrosterone-dependent induction of peroxisomal proliferation can be reduced by aspartyl esterification without attenuation of inhibitory bone loss in ovariectomy animal model.

Kwak CS, Kang CM, Kang HS, Song KY, Lee MS, Seong SC, Park SC.

Aging and Physical Culture Research Institute, Seoul National University, Korea. kwakcnu.ac.kr

The purpose of this study was to determine whether esterification of dehydroepiandrosterone with aspartate (DHEA-aspartate) could reduce peroxisomal proliferation induced by DHEA itself, without loss of antiosteoporotic activity. Female Sprague-Dawley rats were ovariectomized, then DHEA or DHEA-aspartate was administered intraperitoneally at 0.34 mmol/kg BW 3 times a week for 8 weeks. DHEA-aspartate treatment in ovariectomized rats significantly increased trabeculae area in tibia as much as DHEA treatment. Urinary Ca excretion was not significantly increased by DHEA or DHEA-aspartate treatment in ovariectomized rats, while it was significantly increased by ovariectomy. Osteocalcin concentration and alkaline phosphatase activity in serum and cross linked N-telopeptide type I collagen level in urine were not significantly different between DHEA-aspartate and DHEA treated groups. DHEA-aspartate treatment significantly reduced liver weight and hepatic palmitoyl-coA oxidase activity compared to DHEA treatment. DHEA-aspartate treatment maintained a nearly normal morphology of peroxisomes, while DHEA treatment increased the number and size of peroxisomes in the liver. According to these results, it is concluded that DHEA-aspartate ester has an inhibitory effect on bone loss in ovariectomized rats with a marked reduction of hepatomegaly and peroxisomal proliferation compared to DHEA.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11068990&dopt=Abstract

J Invest Dermatol. 2000 Nov;115(5):771-7.
Basement membrane alterations in psoriasis are accompanied by epidermal overexpression of MMP-2 and its inhibitor TIMP-2.

Fleischmajer R, Kuroda K, Hazan R, Gordon RE, Lebwohl MG, Sapadin AN, Unda F, Iehara N, Yamada Y.

Department of Dermatology, Mount Sinai Medical Center, New York, NY 10029, USA.

Psoriasis is most probably an inherited disease characterized by cell proliferation, angiogenesis, and an inflammatory process. The pathophysiology remains unknown, although an alteration in cell-cell and cell-matrix adhesion versus an autoimmune process has been proposed as the primary defect. Here, we show evidence of a new mechanism involving basement membrane alterations accompanied by keratinocyte overexpression of matrix metalloproteinase (MMP) 2 and tissue inhibitor of MMP-2 (TIMP-2) in both uninvolved and involved psoriatic skin. Immunocytochemistry with antibodies against collagen IV (alpha1, alpha2 chains) and laminins (alpha2, alpha5, beta1, gamma1 chains) revealed gaps, folding, and reduplication of the epidermo-dermal basement membrane. There was overexpression of MMP-2 in the cytoplasm of suprabasal keratinocytes. Gelatin zymography revealed pro-MMP-2 and its activated form, a-MMP-2, in both uninvolved and involved psoriatic skin, whereas pro-MMP-9 was only present in involved skin. TIMP-2 was expressed at the cell surface of psoriatic involved suprabasal keratinocytes whereas it was restricted to basal keratinocytes in uninvolved areas. Western blots showed a marked increase in a-MMP-2 and TIMP-2 in uninvolved and involved psoriatic skin although it was more pronounced in the latter. MT1-MP, known to activate pro-MMP-2, was increased in involved areas. In situ hybridization revealed strong signals of MMP-2 mRNA in both uninvolved and involved psoriatic epidermis. The overexpression of MMP-2 in uninvolved and involved psoriatic epidermis supports the concept that the primary alteration may reside in the keratinocyte. In addition, the presence of the activated form of MMP-2 could be responsible for cell-cell and cell-matrix changes noted in psoriatic epidermis.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11069613&dopt=Abstract

J Biol Chem. 2001 Jan 12;276(2):1164-72.
KiSS-1 represses 92-kDa type IV collagenase expression by down-regulating NF-kappa B binding to the promoter as a consequence of Ikappa Balpha -induced block of p65/p50 nuclear translocation.

Yan C, Wang H, Boyd DD.

Department of Cancer Biology, MD Anderson Cancer Center, Houston, Texas 77030, USA.

The 92-kDa type IV collagenase (MMP-9) plays a critical role in tissue remodeling. We undertook a study to determine whether the KiSS-1 gene, previously shown to suppress cancer spread (metastases), negatively regulates MMP-9 expression. Six cell lines positive for MMP-9 mRNA were deficient in KiSS-1 mRNA. One of these cell lines, HT-1080, stably transfected with a KiSS-1 expression construct, demonstrated substantially lower MMP-9 enzyme activity/protein and in vitro invasiveness. The lower MMP-9 enzyme activity reflected reduced steady-state mRNA levels which, in turn, was due to attenuated transcription. Activation of ERKs and JNKs by phorbol 12-myristate 13-acetate and tumor necrosis factor alpha, respectively, leading to increased MMP-9 amounts was not antagonized by KiSS-1 expression, suggesting that MAPK pathways modulating MMP-9 synthesis are not the target of KiSS-1. Although MMP-9 expression is regulated by AP-1, Sp1, and Ets transcription factors, KiSS-1 did not alter the binding of these factors to the MMP-9 promoter. However, NF-kappaB binding to the MMP-9 promoter required for expression of this collagenase was reduced by KiSS-1 expression. Diminished NF-kappaB binding reflected less p50/p65 in the nucleus secondary to increased IkappaBalpha levels in the cytosols of the KiSS-1 transfectants. Thus, KiSS-1 diminishes MMP-9 expression by effecting reduced NF-kappaB binding to the promoter.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11060311&dopt=Abstract

tc.umn.edu

STUDY DESIGN: This laboratory-based experiment correlates fibronectin content of intervertebral disc with a morphologic grade of degeneration. OBJECTIVES: To correlate the fibronectin content of the anulus fibrosus and nucleus pulposus with a gross morphologic grade of disc degeneration, and to determine the molecular size of the extractable fibronectin. SUMMARY OF BACKGROUND DATA: Intervertebral disc degeneration increases with age and can lead to low back pain. Fibronectin helps to organize the extracellular matrix and provides environmental cues by interaction with cell surface integrins. In other tissues, its synthesis is elevated in response to injury. Fibronectin fragments can stimulate cells to produce metalloproteases and cytokines and inhibit matrix synthesis. METHODS: In this study, 17 anuli fibrosis and 18 nuclei pulposus from 11 spines were graded by Thompson's gross morphologic scale. Fibronectin was sequentially extracted with 4 mol/L guanidine hydrochloride and trypsin, and then quantitated by enzyme-linked immunoassay. The size of extractable fibronectin was determined by Western blot analyses. RESULTS: The fibronectin content of the disc increased with grade and was significantly elevated between Grades 3 and 4. The percentage of extractable fibronectin varied widely, but it was more extractable from the nucleus. In both the nucleus and anulus, 30% to 40% of the extractable fibronectin existed as fragments. Many of the fragments contained functional heparin or collagen-binding sites. CONCLUSIONS: Fibronectin is elevated in degenerated discs and frequently present as fragments. Elevated levels of fibronectin suggest that disc cells are responding to the altered environment. Fibronectin fragments resulting from normal or enhanced proteolytic activity could be a mechanism that induces the cell to degrade the matrix further.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11064518&dopt=Abstract

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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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