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References: Hair growth and hair loss

Cancer Res. 1997 Aug 15;57(16):3436-43.
Evidence that cutaneous carcinogen-initiated epithelial cells from mice are quiescent rather than actively cycling.

Morris RJ, Coulter K, Tryson K, Steinberg SR.

The Lankenau Medical Research Center, Wynnewood, Pennsylvania 19096, USA.

The basal layer of the epidermis and hair follicles is composed of actively cycling, transit-amplifying cells and quiescent cells including stem cells. To determine which population is the target of carcinogenic chemicals, we treated CD-1 female mice topically with 5-fluorouracil (5-FU), an agent known to kill cycling but not quiescent cells, to probe the origin of the neoplastic lesions. We first determined that 5-FU kills cycling cells in the epidermis. Treatment of mice at 59 days of age (when in anagen 1) with topical 5-FU delayed hair regrowth by 10 days compared to vehicle-treated controls, suggesting that 5-FU killed the cells in anagen. Moreover, 5-FU suppressed the usual hyperplastic response of the epidermal cells to treatment with 12-O-tetradecanoylphorbol-13-acetate. 5-FU reduced the number of epidermal basal cells counted in cross-sections of skin and suppressed DNA synthesis. Approximately 50% of mice treated with 5-FU developed, within 1 week of treatment, a sloughing of the epidermis persisting for 3 weeks, followed by complete healing. Despite the evidence of cell killing in the epidermis and lower hair follicles, in a carcinogenesis experiment where 5-FU or vehicle was applied following tumor initiation with 7,12-dimethylbenz[a]anthracene, the papilloma and carcinoma responses were virtually identical whether or not the mice were treated with 5-FU, suggesting that the tumors arose from quiescent, rather than actively cycling, epidermal cells. When 5-FU was applied before initiation, the papilloma but not the carcinoma responses were slightly but significantly reduced relative to controls. These results are consistent with the hypothesis that the quiescent rather than the rapidly proliferating cells are the targets of tumor initiation.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=9270010&dopt=Abstract

Dermatol Surg. 1997 Sep;23(9):737-9.
Laser-assisted hair removal by selective photothermolysis. Preliminary results.

Lask G, Elman M, Slatkine M, Waldman A, Rozenberg Z.

Division of Dermatology, UCLA Medical Center, USA.

BACKGROUND: Laser-assisted hair removal with the long pulsed ruby laser is a promising new technique based on selectively targeting melanin in hair follicles. OBJECTIVE: The purpose of this study was to evaluate the efficacy and safety of the long pulsed ruby laser (EpiTouch) for hair removal. METHODS: The Epitouch laser was used for hair removal of the arms of 20 patients. The areas were evaluated immediately post-treatment, and at 1, 4, 8, and 12 weeks, for efficacy and complications. RESULTS: Postoperative results showed 40-80% regrowth after 12 weeks. CONCLUSION: Selective melanin-based photothermolysis with a free running pulsed ruby laser seems to be a promising, noninvasive technique for long-term hair removal. More than one treatment is necessary since only anagen hair will be affected.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=9311365&dopt=Abstract

Mech Ageing Dev. 1976 Mar-Apr;5(2):109-24.
Patho-physiologic findings after chronic tryptophan deficiency in rats: a model for delayed growth and aging.

Segall PE, Timiras PS.

Long-Evans female rats three weeks, three months and 13-14 months of age were placed on tryptophan-deficient diets for periods ranging from a few months to nearly two years. Growth was interupted during the period of tryptophan-deficiency, but when the animals were returned to a complete diet, they gained weight and grew to normal size. Ability to reproduce, as indicated by litter production, was present at 17-28 months of age in rats which had been deprived of tryptophan, whereas no controls over 17 months of age produced any offspring. Other signs of delayed aging in the experimental group included, at advanced ages, greater longevity, as well as later onset in the appearance of obvious tumors, and better coat condition and hair regrowth. Many of these effects were also seen in pair-fed controls (fed a diet equal in amount to that eaten by the tryptophan-deprived rats, but with 1-tryptophan added). It is hypothesized that tryptophan deficiency delays growth, development and maturation of the central nervous system (CNS), in particular, by decreasing the levels of the neurotransmitter serotonin, for which tryptophan is the necessary precursor. In a parallel experiment, chronic treatment with d, 1-parachlorophenylalanine, an inhibitor of brain serotonin synthesis, from weaning until adulthood, also inhibited growth (body weight) and delayed sexual maturation (age of vaginal opening). These observations suggest that diets deficient in tryptophan or restricted in calories can affect maturation and aging by interfering with CNS protein synthesis, or neurotransmitter metabolism, or both.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=933560&dopt=Abstract

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