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The Histochemical Demonstration and the Numerical Relationship of Tyrosine-Positive and Dopa-Positive Cells

GEORGE SZABÓ, M.Sc., Ph.D.

AMA Arch Derm. 1957;76(3):324-329.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

Introduction

It is generally assumed that tyrosine is the precursor of melanin formed in human skin (Lerner and Fitzpatrick, 1950). The specific enzyme for melanogenesis, tyrosinase, is thought to be located in the melanocytes or pigmentory dendritic cells of the epidermis (Masson, 1948; Billingham, 1948 and 1949; Becker Jr., Fitzpatrick, and Montgomery, 1952; Billingham and Medawar, 1953).

Histochemical localization of tyrosinase in melanocytes of mammalian skin, however, has been unsuccessful but for two instances. Foster (1952) and Foster and Cook (1954) have found a positive reaction in the melanocytes of the hair follicles of mice, and Fitzpatrick, Becker Jr., Lerner and Montgomery (1950) and Fitzpatrick (1952) demonstrated the uptake of tyrosine in melanomas and in irradiated epidermis of human skin. Melanocytes of normal, nonirradiated epidermis of the same skin failed to take up tyrosine and to form pigment. Similar results were obtained . . . [Full Text PDF of this Article]

Author Affiliations
London

From the Department of Zoology, University College London, and the Dermatological and Anatomy Departments, The London Hospital.

Footnotes
Received for publication Jan. 17, 1957.

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