Part III: General Considerations of Skin Pigmentation: Disturbances of Melanin Pigmentation
نویسندگان
چکیده
منابع مشابه
Melanin pigmentation in mammalian skin and its hormonal regulation.
Cutaneous melanin pigment plays a critical role in camouflage, mimicry, social communication, and protection against harmful effects of solar radiation. Melanogenesis is under complex regulatory control by multiple agents interacting via pathways activated by receptor-dependent and -independent mechanisms, in hormonal, auto-, para-, or intracrine fashion. Because of the multidirectional nature ...
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Topica! tyrosine has been proposed as a tanning accelerator because tyrosine is a precursor of melanin. We tested formulations containing O, 1, and 2% L-tyrosine topically on 14 individuals daily for 28 days. Percutaneous absorption using "C tyrosine was 1.23% in 24 hr. No enhanced pigmentation was clinically evident in any of the subjects. In this study, we were unable to demonstrate that topi...
متن کاملThe regulation of skin pigmentation.
Visible pigmentation of the skin, hair, and eyes depends primarily on the functions of melanocytes, a very minor population of cells that specialize in the synthesis and distribution of the pigmented biopolymer melanin. Melanocytes are derived from precursor cells (called melanoblasts) during embryological development, and melanoblasts destined for the skin originate from the neural crest. The ...
متن کاملCushing's syndrome and skin pigmentation.
the appendage biopsy results failed to give any indication of prognosis. In two of our cases the comment had been made at the first operation that " it would not be surprising if the rheumatic process were still active," and in these two cases the appendage biopsies showed numerous Aschoff bodies suggesting continued rheumatic activity. Another patient had several attacks of subacute rheumatism...
متن کاملInterrelationship of Smoking, Lip and Gingival Melanin Pigmentation, and Periodontal Status
Background: Cigarette smoking is a significant risk factor for periodontal disease. It also causes pigmentation of oral mucosa. The present study was aimed to assess the effects of smoking on lip and gingival pigmentation and periodontal status and the relationship between pigmentation and periodontal parameters. Methods: A total of 109 smokers and an equal number of non-smoker controls (mean a...
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ژورنال
عنوان ژورنال: Journal of Investigative Dermatology
سال: 1959
ISSN: 0022-202X
DOI: 10.1038/jid.1959.39