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hair related research references ||
testosterone related research references ||
melanin related research references
FASEB J. 2003 Jul;17(10):1248-55.
Tyrosinase: a developmentally specific major determinant of peripheral dopamine.
Eisenhofer G, Tian H, Holmes C, Matsunaga J, Roffler-Tarlov S, Hearing VJ.
Section on Clinical Neurocardiology, National Institute of Neurological Disorders and Stroke, National Institutes of Health, 10 Center Dr. MSC 1620, Bethesda, MD 20892-1620, USA. gox-g.nih.gov
L-3,4-dihydroxyphenylalanine, the immediate precursor of dopamine, can be formed by two enzymes: tyrosine hydroxylase (TH) in catecholamine-producing neurons and chromaffin cells and tyrosinase in melanocytes. In this study we examined whether tyrosinase contributes to production of dopamine. Deficiency of TH caused marked reductions in norepinephrine in albino and pigmented 15-day-old mice. In contrast, peripheral levels of dopamine were reduced only in albino TH-deficient mice and were higher in pigmented than in albino mice, regardless of the presence or absence of TH. We next examined age-related changes in dopamine and cutaneous expression of tyrosinase and melanin in albino and pigmented TH wild-type mice. We found that the differences in peripheral dopamine between pigmented and albino mice disappeared with advancing age following changes in expression and function of tyrosinase. In young animals, tyrosinase was present in epidermis but did not produce detectable melanin. With advancing age, tyrosinase was localized only around hair follicles, melanin synthesis became more pronounced, and dopamine synthesis decreased. The data reveal a previously unrecognized TH-independent major pathway of peripheral dopamine synthesis in young, but not adult, mice. The transient nature of this source of dopamine reflects a developmental switch in tyrosinase-dependent production of dopamine to production of melanin.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12832289&dopt=Abstract
J Neuroendocrinol. 2003 Aug;15(8):754-60.
Neuropeptide y targets in the hypothalamus: nitric oxide synthesizing neurones express Y1 receptor.
Fetissov SO, Xu ZQ, Byrne LC, Hassani H, Ernfors P, Hokfelt T.
Department of Neuroscience B3:4, Karolinska Institutet, Stockholm, Sweden. serguei.fetissoeuro.ki.se
Neuropeptide Y (NPY)-expressing neurones in the arcuate nucleus densely innervate many hypothalamic nuclei. To determine the neurochemical phenotype of target neurones for NPY, we studied the immunohistochemical localization of the NPY Y1 receptor (Y1R) in discrete subpopulations of neurones in the rat hypothalamus. Among several tested populations, including hypocretin/orexin-, melanin-concentrating hormone (MCH)- and nitric oxide synthase (NOS)-positive neurones, only the latter were found to coexpress the Y1R. Numerous Y1R/NOS-positive neurones were found as a densely packaged group of cells located ventrolateral to the ventromedial nucleus, forming a band ascending towards the fornix. Lower numbers of Y1R/NOS-positive neurones were found in the perifornical area and in the peri- and paraventricular nuclei. Expression of the Y1R gene was found in the same locations in the mouse by colocalizing beta-galactosidase, a Y1R gene reporter, with NOS in a Y1R knockout mouse. To explore possible downstream targets of NO in the rat hypothalamus, the NO-regulated molecule cGMP was analysed immunohistochemically after incubation of brain slices with sodium nitroprusside, an NO donor. We observed several cGMP-positive cell bodies in the arcuate nucleus, cGMP-positive blood vessels and a cGMP-positive network of thin fibres, some of which colocalized with choline acetyltransferase.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12834436&dopt=Abstract
J Clin Periodontol. 2003 Jul;30(7):644-54.
Distribution of selected bacterial species on intraoral surfaces.
Mager DL, Ximenez-Fyvie LA, Haffajee AD, Socransky SS.
Department of Periodontology, The Forsyth Institute, Boston, MA 02115, USA.
BACKGROUND/AIM: To examine the proportions of 40 bacterial species in samples from 8 oral soft tissue surfaces and saliva in systemically healthy adult subjects and to compare these microbiotas with those of supra- and subgingival plaque. METHODS: Microbial samples were taken from 8 oral soft tissue surfaces of 225 systemically healthy subjects using a "buccal brush". Saliva was taken by expectoration. Forty-four of these subjects provided additional supra- and subgingival plaque samples. Samples were individually evaluated for their content of 40 bacterial species using checkerboard DNA-DNA hybridization. The percentage of total DNA probe count was determined for each species, at each sample location and averaged across subjects. The significance of differences among the proportions of the 40 test species at different sample locations was sought in the 225 and 44 subjects separately using the Quade test and adjusted for multiple comparisons. Cluster analysis was performed using the proportions of the 40 species at the different sample locations using the minimum similarity coefficient and an average unweighted linkage sort. The proportions of each species were averaged across subjects in the resulting cluster groups and the significance of differences was tested using the t-test and ANOVA. RESULTS: Microbial profiles differed markedly among sample locations in the 225 subjects, with 34 of 40 species differing significantly. Proportions of Veillonella parvula and Prevotella melaninogenica were higher in saliva and on the lateral and dorsal surfaces of the tongue, while Streptococcus mitis and S. oralis were in significantly lower proportions in saliva and on the tongue dorsum. Cluster analysis resulted in the formation of 2 clusters with >85% similarity. Cluster 1 comprised saliva, lateral and dorsal tongue surfaces, while Cluster 2 comprised the remaining soft tissue locations. V. parvula, P. melaninogenica, Eikenella corrodens, Neisseria mucosa, Actinomyces odontolyticus, Fusobacterium periodonticum, F. nucleatum ss vincentii and Porphyromonas gingivalis were in significantly higher proportions in Cluster 1 and S. mitis, S. oralis and S. noxia were significantly higher in Cluster 2. These findings were confirmed using data from the 44 subjects providing plaque samples. The microbial profiles of supra- and subgingival plaque differed from the other sample locations, particularly in the increased proportions of the Actinomyces species. Species of different genera exhibited different proportions on the various intraoral surfaces, but even within the genus Streptococcus, there were differences in colonization patterns. S. oralis, S. mitis and S. constellatus colonized the soft tissues and saliva in higher proportions than the samples from the teeth, while the other 4 streptococcal species examined colonized the dental surfaces in proportions comparable to the soft tissue locations and saliva. CONCLUSIONS: Proportions of bacterial species differed markedly on different intraoral surfaces. The microbiota of saliva was most similar to that of the dorsal and lateral surfaces of the tongue. The microbiotas of the soft tissues resembled each other more than the microbiotas that colonized the teeth both above and below the gingival margin.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12834503&dopt=Abstract [PubMed - in process]
The most ostensive feature that distinguishes us human from chimps and other primates is the lack of bodily hair. During evolutionary process, we have lost the majority of hair. Hair is no longer an essential part of our body, just like appendix. What little hair we still have on our scalp and a few other bodily parts is still regarded as significant for reasons other than biological necessity. Hair loss is naturally accompanied by aging process, although the extent of hair loss and the timing of onset vary widely among individuals. Thus, loss of hair and baldness is considered as a symbol of maturity or old age. Like winkles and other signs of aging, hair loss is not welcome by most people, because we don't welcome aging, and being perceived as an aging person. However, it is alopecia, or premature hair loss that especially concerns certain people.
Hair Million is a blend of Asian herbs that wards off hair loss and promotes hair growth. Of various approaches to hair restoration, Hair Million offers advantages including low cost compared with other methods or drugs, and safety, because it is made of safe and healthy herbs.
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