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Article
August 1995

bcl-2 Expression in Melanocytic NeviInsights Into the Biology of Dermal Maturation

Author Affiliations

From the Departments of Pathology (Drs Morales-Ducret, van de Rijn, and Smoller) and Dermatology (Dr Smoller), Stanford (Calif) University Medical Center.

Arch Dermatol. 1995;131(8):915-918. doi:10.1001/archderm.1995.01690200051010
Abstract

Background and Design:  Recently, a new category of oncogenes has been discovered that regulate programmed cell death. The bcl-2 oncogene has been found to inhibit cellular death without affecting cellular proliferation. In the skin, bcl-2 expression is limited to cells along the basal cell layer. However, we also noticed that resting melanocytes appeared to express bcl-2. We examined the expression of bcl-2 and its possible role in the biology of benign melanocytic proliferations. Routine paraffin sections of formalin-fixed tissue were labeled with anti-bcl-2 monoclonal antibody, and expression of bcl-2 was detected by a biotin-avidin-immunoperoxidase procedure.

Results:  We examined 13 congenital, 11 acquired, and six atypical or dysplastic nevi for expression of bcl-2. Expression of bcl-2 was observed in 11 of 13 congenital nevi. All 11 acquired nevi and 6 nevi with architectural disarray and cytologic atypia expressed bcl-2. Both junctional and intradermal melanocytes expressed bcl-2 in a perinuclear and cytoplasmic pattern. Within neurotized areas, bcl-2 became significantly weaker and totally absent.

Conclusions:  In mature tissues, bcl-2 expression is quite limited. It appears to be restricted to pluripotential stem cells that serve as a reservoir for tissue that is constantly undergoing renewal, such as the hematopoietic cells and the intestinal mucosa. In the skin, bcl-2 expression has been previously reported to be limited to the epidermal basal cell layer and proliferation zones. Our results indicate that resting melanocytes and melanocytic nevi regularly express bcl-2.(Arch Dermatol. 1995;131:915-918)

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