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Open Access Efficacy of Hydroquinone in the Treatment of Cutaneous Hyperpigmentation in Hairless Descendants of Mexican Hairless Dogs Xoloitzcuintli)

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Abstract:

The skin of adult hairless dogs is clinically nonpigmented, clinically lightly pigmented, or clinically hyperpigmented (spotty pigmented). The pigment noted clinically is attributable to melanin granules in the epidermis. Spotty pigmentation in the skin of adult hairless dogs was treated by administration of the depigmenting agent (3% hydroquinone, HQ) for 1 month. Depigmenting effects were examined by use of three methods: skin color, dihydroxyphenylalanine (DOPA)-positive melanocyte count, and histologic evaluation. The treated skin of hairless dogs began to become depigmented after application of HQ for 1 week. After 1 month of treatment with HQ, depigmentation spread over a quarter of the body. The number of DOPA-positive melanocytes in the HQ-treated sites decreased to less than approximately a fifth of that before treatment. In HQ-treated skin, histologic staining by use of Fontana-Masson's (FM) method revealed complete absence of melanin pigment. These results suggested that hairless dogs should be a useful animal model for investigating the effects and cutaneous toxicity of depigmenting agents.

Document Type: Research Article

Affiliations: 1: Research Center, Nihon Nosan Kogyo Co., Ltd., Takura 5246, Tsukuba, Ibaraki 300-2615, Japan 2: Department of Veterinary Pathology, Faculty of Agriculture, The University of Tokyo, Bunkyo, Tokyo, Japan

Publication date: October 1, 1998

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  • Comparative Medicine (CM), an international journal of comparative and experimental medicine, is the leading English-language publication in the field and is ranked by the Science Citation Index in the upper third of all scientific journals. The mission of CM is to disseminate high-quality, peer-reviewed information that expands biomedical knowledge and promotes human and animal health through the study of laboratory animal disease, animal models of disease, and basic biologic mechanisms related to disease in people and animals.

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