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Arch Dermatol. 2003 Jun;139(6):767-70.
The congenital lingual melanotic macule.

Dohil MA, Billman G, Pransky S, Eichenfield LF.

Pediatric and Adolescent Dermatology, Children's Hospital, and Department of Pediatrics, University of California, San Diego, School of Medicine, 92123, USA.

BACKGROUND: Circumscribed oral melanotic macules in adults are a well-defined entity. Congenital oral melanotic macules, however, are rare and not well characterized. We report 5 cases of congenital lingual melanotic lesions with consistent clinical and histologic features. OBSERVATIONS: Congenital lingual melanotic macules presented in all cases at birth, followed by proportional growth. Clinical findings were well-circumscribed, brown, single or multiple macules on the tongue, 2 to 5 mm in size, without history of bleeding, ulceration, or trauma. Family history was negative for similar pigmented lesions. A literature review showed only 2 previous clinical case reports with similar features. Histopathologic examination showed increased melanin pigmentation in the basal epidermal layer with varying degrees of overlying hyperkeratosis and subepidermal pigment-laden macrophages. No appreciable increase in melanocyte number, junctional nests of melanocytes, or cell atypia was noted. Two retrospective histopathology reviews mention 4 corresponding cases but report no clinical data. CONCLUSION: The congenital lingual melanotic macule represents a clinically distinct, benign, pigmented oral melanotic lesion, and may be more common than the literature suggests.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12810508&dopt=Abstract

Oecologia. 2003 Jun 17 [Epub ahead of print].
Why do melanin ornaments signal individual quality? Insights from metal element analysis of barn owl feathers.

Niecke M, Rothlaender S, Roulin A.

Institut fur Experimentalphysik, Universitat Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany.

Melanin-based variation in colour patterns is under strong genetic control and not, or weakly, sensitive to the environment and body condition. Current signalling theory predicts that such traits may not signal honestly phenotypic quality because their production does not entail a significant fitness cost. However, recent studies revealed that in several bird species melanin-based traits covary with phenotypic attributes. In a first move to understand whether such covariations have a physiological basis, we quantified concentrations of five chemical elements in two pigmented plumage traits in the barn owl ( Tyto alba). This bird shows continuous variation from immaculate to heavily marked with black spots (plumage spottiness) and from dark reddish-brown to white (plumage coloration), two traits that signal various aspects of individual quality. These two traits are sexually dimorphic with females being spottier and darker coloured than males. We found an enhancement in calcium and zinc concentration within black spots compared with the unspotted feather parts. The degree to which birds were spotted was positively correlated with calcium concentration within spots, whereas the unspotted feather parts of darker reddish-brown birds were more concentrated in zinc. This suggests that two different pigments are responsible for plumage spottiness and plumage coloration. We discuss the implications of our results in light of recent experimental field studies showing that female spottiness signals offspring humoral response towards an artificially administrated antigen, parasite resistance and fluctuating asymmetry of wing feathers.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12811535&dopt=Abstract [PubMed - as supplied by publisher]

Oncol Res. 2003;13(11):503-12.
Synthesis and antimelanoma activity of tertiary amide analogues of N-acetyl-4-S-cysteaminylphenol.

Pearson VC, Ferguson J, Rogers PM, Kelland LR, Robins DJ.

Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, UK.

The biosynthetic pathway to melanin is a realistic target for therapeutic intervention in the development of new drugs to combat malignant melanoma. N-Acetyl-4-S-cysteaminylphenol (1) is an analogue of a biosynthetic intermediate in the pathway to melanin. It probably acts as a prodrug and is oxidized selectively in melanocytes to an o-quinone, which can alkylate cellular nucleophiles resulting in interference with cell growth and proliferation. We previously synthesized a range of more lipophilic analogues of 1 by varying the acyl portion and introducing substitution alpha to the nitrogen. Most of the new compounds displayed greater cytotoxicity than the original lead compound 1. We have now prepared 12 new compounds with varying acyl portions and three different substituents on the nitrogen of the amide in order to increase lipophilicity and to reduce the possibility of hydrolysis of the amides. Most of the tertiary amides showed greater cytotoxicity towards five representative melanoma cell lines than the parent secondary amide. The highest cytotoxicity, comparable to cisplatin, was observed for the benzyl substituted compounds 4, 8, 12, and 16 and the cyclohexylacetamide derivatives 13-15 against these five cell lines. The moderate activity of 13-16 against SK-Mel-24 (non-tyrosinase containing) and an ovarian cell line suggests that interference with the melanin pathway may not be the only mode of action of these new compounds.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12812364&dopt=Abstract [PubMed - in process]

The average human scalp is covered by approximatey 100,000 hair follicles. Each hair undergoes hair cycle and normally 50-100 hairs randomly fall out a day, which is unnoticeable because lost hair is replaced by as many new hairs springing up daily. Hair loss results from the fall out of hair from the hair follicle. Alopecia or excessive, premature hair loss is the condition caused by many factors. Loss of hair itself does not pose critical health problems because biological role of human hair is relatively marginal. Hair on our scalp protects the head from mechanical shock, heat loss, and exposure to UV-light. The eyelashes and eyebrowes protect the eyes, and hair in the ear canal or the nasal passages help filter out particles and pathogens, thus protecting our internal organs. However, hair does play important social role: it is one of the major determinants of our appearance and identity in daily life. Fullness of hair also implicates or manifests physical integrity and youthfulness of the person. Losing hair could have more than just emotional impacts on individuals. The hair is a unique organ that goes through a characteristic cycle consisting of an immature phase, a growing phase called anagen, a transitional phase between the growing phase and the resting phase called catagen, and finally a resting phase called telogen in which the hair stops growing, waiting to fall out. 85-90% of hairs on our body are in anagen phase or growing phase, which lasts anywhere from two to five years. This phase is followed by a short regression phase, or catagen, which lasts 2-3 weeks. Approximately 1% of hair follicles are in catagen. Approximately 10-15% of hair follicles are in the resting phase, the telogen, which lasts about 3-5 months. Hair follicles typically goes through 10-20 asynchronous cycles during the lifetime. Persistent loss of more than 150 hairs would consist a state of hair loss, or alopecia, albeit it could be temporary.

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