Study of telomerase reverse transcriptase (hTERT) expression in normal, aged, and photo-aged skin.

Background: Telomerase is a ribonucleoprotein enzyme capable of extending chromosome ends with telomeric DNA sequences. It protects the germline and stem cells from senescence by preventing telomere attrition. Cutaneous aging includes intrinsic aging, and photo-aging.

Psoralen plus ultraviolet A irradiation-induced lentigines arising in vitiligo: involvement of vitiliginous and normal appearing skin.

Psoralen plus ultraviolet A irradiation (PUVA therapy) is commonly used for the management of vitiligo in which perifollicular repigmentation is the usual response pattern. However, excessive PUVA therapy may be associated with adverse effects. We report a case of generalized vitiligo that has been extensively treated with topical and systemic PUVA therapy for several years with the development of extensive and widespread stellate and irregularly shaped black and brown macules (lentigines).

HLA and leprosy: segregation and linkage study.

Background: The presence of a genetic factor in the determination of leprosy has long been debated. This study tests whether the HLA-linked control of susceptibility to leprosy and/or for the types of leprosy could be confirmed.

Materials And Methods: In 15 multicase families, the method of DeVries et al.

Light and electron microscopic studies of pityriasis rosea.

Light and electron microscopic studies of biopsy specimens taken from five patients with pityriasis rosea revealed the most conspicuous finding to be the presence of dyskeratotic cells within the epidermis. Ultrastructurally, these cells contained an aggregation of tonofilaments, intracytoplasmic desmosomes, many vacuoles, and viral-like particles. It is assumed that pityriasis rosea is caused by a virus to which these changes are related.

Clinical study on syphilis in Abu Dhabi with special stress on the unusual presentation of the disease.

Seventy-nine cases of syphilis were the material of this study. Unusual presentations of primary syphilis were found in 42.5% of cases; explanations are given for these findings.