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Interferon research abs 1 || Hemoglobin research abs || Stem cell research abs || Nucleic acid research abs || Herpes research abs || Bronchitis research abs || Schizophrenia research abs || Tuberculosis research abs || Pneumonia research abs || Constipation research abs || Laxative research abs || hair research abs || hair related research references

Med Mycol. 1998 Dec;36(6):395-404.
Purification and characterization of a 315 kDa keratinolytic subtilisin-like serine protease from Microsporum canis and evidence of its secretion in naturally infected cats.

Mignon B, Swinnen M, Bouchara JP, Hofinger M, Nikkels A, Pierard G, Gerday C, Losson B.

Department of Parasitology & Parasitic Diseases, Faculty of Veterinary Medicine, University of Liege, Belgium. bmignolg.ac.be

A keratinolytic protease, secreted as the major component by a feline clinical isolate of Microsporum canis cultivated in a minimal medium containing cat keratin, was purified by affinity chromatography on bacitracin agarose and gel filtration. The apparent molecular mass of the enzyme was 31.5 kDa and the pI was 11.8. The enzyme was not glycosylated and its first 15 N-terminal amino acids showed numerous similarities with other fungal subtilisins. The optimum pH was around 9 while inactivation of the enzyme was reversible at pH 4, but not at pH 11. The enzyme was stable at 37 degrees C with an apparent optimum temperature around 55 degrees C. PMSF, soybean trypsin inhibitor (SBTI) and chymostatin strongly inhibited the proteinase. The highest affinity (Km of 0.37 mM) and physiological efficiency (k(cat)/Km) were obtained for the synthetic substrate N-Suc-Ala-Ala-Pro-Phe-p-nitroanilide. These results indicate that the keratinase belongs to the subtilisin-like serine protease family. Purified rabbit immunoglobulins G prepared against the keratinase and used in an immunohistochemical test allowed the detection of the keratinase produced by the fungus invading hair structures in naturally infected cats. The in vitro keratinolytic activity of the enzyme and its production in vivo suggest that it may contribute to pathogenicity.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10206750&dopt=Abstract

Hear Res. 2003 Jul;181(1-2):85-93.
The presence of opioid receptors in rat inner ear.

Jongkamonwiwat N, Phansuwan-Pujito P, Sarapoke P, Chetsawang B, Casalotti SO, Forge A, Dodson H, Govitrapong P.

Neuro-Behavioural Biology Center, Institute of Science and Technology for Research and Development, Mahidol University, 73170 Nakornpathom, Thailand.

Opioid peptides have been identified in the inner ear but relatively little information is available about the expression and distribution of their receptors. The aim of the present study was therefore to identify and localize the mu (MOR), delta (DOR) and kappa (KOR) opioid receptor subtypes within the rat cochlea. The expression of these opioid receptor subtypes was determined by reverse transcriptase-polymerase chain reaction followed by nested polymerase chain reaction analysis. Amplification of RNAs from rat cerebral cortex (positive control) and rat cochlea with MOR, DOR and KOR primers resulted in products of the predicted lengths, 564, 356 and 276 bp, respectively. Restriction digestion confirmed the identity of these products. All three receptor subtypes were identified in the cochlea and further characterized by immunocytochemistry. DOR and KOR immunoreactivity was found in inner and outer hair cells, bipolar cells of the spiral ganglion and interdental cells of the limbus. In contrast, no MOR immunoreactivity was observed in the inner and outer hair cells, and interdental cells. All three types of receptor fibers were also detected in the bipolar cells and nerve fibers within the spiral ganglion. In addition, MOR- and KOR-containing nerve fibers were observed in the limbus. These findings are the first report of the presence of all three classical opioid receptors in the inner ear and suggest that these receptors may have both presynaptic and postsynaptic roles.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12855366&dopt=Abstract [PubMed - in process]

Arch Dermatol. 2002 Jul;138(7):916-22.
Mediation of alopecia areata by cooperation between CD4+ and CD8+ T lymphocytes: transfer to human scalp explants on Prkdc(scid) mice.

Gilhar A, Landau M, Assy B, Shalaginov R, Serafimovich S, Kalish RS.

Research Laboratories, Flieman Medical Center and B. Rappaport Faculty of Medicine, Technion Institute of Technology, Haifa, Israel.

OBJECTIVE: To determine the role of CD4+ and CD8+ T lymphocytes in the pathogenesis of alopecia areata. DESIGN: Relapse of alopecia areata was induced in autologous human scalp grafts on Prkdc(scid) mice by injection of activated T lymphocytes derived from lesional skin. CD4+ and CD8+ T cells were separated by magnetic beads before injection. SETTING: University-based dermatology practice. PARTICIPANTS: Eleven patients with either alopecia totalis or severe alopecia areata. MAIN OUTCOME MEASURES: Hair regrowth, hair loss, and immunohistochemical findings of scalp explants. INTERVENTION: Transfer of scalp T cells to autologous lesional scalp explants on Prkdc(scid) mice. RESULTS: Injection of unseparated T cells and mixed CD4+ plus CD8+ T cells resulted in significant hair loss (P<.01) in 5 of 5 experiments. However, injection of purified CD4+ or CD8+ T cells alone did not result in reproducible hair loss. CD4+ and CD8+ T cells induced follicular expression of intercellular adhesion molecule 1 (CD54), HLA-DR, and HLA-A, HLA-B, and HLA-C after injection into scalp grafts. CONCLUSIONS: CD4+ and CD8+ T cells have a role in the pathogenesis of alopecia areata. It is hypothesized that CD8+ T cells act as the effector cells, with CD4+ T cell help. It is now necessary to look for HLA-A, HLA-B, and HLA-C associations with alopecia areata. Therapeutic manipulations that interfere with CD8+ activity should be examined.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12071819&dopt=Abstract

Hear Res. 2002 Jul;169(1-2):13-23.
Stereocilia defects in waltzer (Cdh23), shaker1 (Myo7a) and double waltzer/shaker1 mutant mice.

Holme RH, Steel KP.

MRC Institute of Hearing Research, University of Nottingham, Nottingham NG7 2RD, UK.

Mutations in myosin VIIa (Myo7a) and cadherin 23 (Cdh23) cause deafness in shaker1 (sh1) and waltzer (v) mouse mutants respectively. In humans, mutations in these genes cause Usher's syndrome type 1B and D respectively, as well as certain forms of non-syndromic deafness. Examination of the organ of Corti from shaker1 and waltzer mice has shown that these genes are required for the proper organisation of hair cell stereocilia. Here we show that at embryonic day 18.5, the outer hair cells of Cdh23(v) homozygote mutant mice appear immature, projecting fewer recognisable stereocilia than heterozygote controls, and by post-natal day (P) 4 their stereocilia are arranged in a disorganised pattern rather than in the regular 'V'-shape seen in heterozygotes. Inner hair cell stereocilia are also disorganised in Cdh23(v) mutant homozygotes. Myo7a was expressed normally in the hair cells of P0 Cdh23(v2J) mutants demonstrating that cadherin 23 is not required for Myo7a expression at this stage. No stereocilia defects were observed in P4 Cdh23(v)/Myo7a(4626SB) double heterozygotes (+/Cdh23(v) +/Myo7a(4626SB)) and neither the Cdh23(v) nor Myo7a(4626SB) homozygote phenotypes were affected by the presence of one mutant copy of Myo7a or Cdh23 respectively. The hair cell phenotype of double homozygote mutant mice did not differ from single Myo7a(4626SB) homozygote mutants. Finally, we found no significant correlation between loss of hearing and double heterozygosity for mutations in Cdh23 and Myo7a in mice aged between 7.5 and 10 months. These findings suggest that Cdh23 and Myo7a are both required for establishing and/or maintaining the proper organisation of the stereocilia bundle and that they do not genetically interact to affect this process nor to cause age-related hearing loss.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12121736&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 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.

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