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Basic Sciences

Selective Cytotoxicity of 4-S-Cysteaminylphenol on Follicular Melanocytes of the Black Mouse: Rational Basis for Its Application to Melanoma Chemotherapy

Yoshiko Ito and Kowichi Jimbow
Yoshiko Ito
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Kowichi Jimbow
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DOI:  Published June 1987
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Abstract

We have previously shown that 4-S-cysteaminylphenol (4-S-CAP) causes a significant inhibition of in vivo melanoma growth. To clarify the mechanism of the in vivo antimelanoma effect, this study evaluated the cellular and subcellular changes of follicular melanocytes after s.c. administration of 4-S-CAP on the lumbar areas of black and albino mice. 4-S-CAP produced a prompt, selective swelling and lysis of melanocytes, resulting eventually in the necrosis of melanocytes and the depigmentation of black hair follicles. None of the degenerative changes were seen in melanocytes and keratinocytes of control albino follicles. Comparison of melanocytes in black and albino follicles revealed that melanin synthesis is highly active in the melanocytes of black follicles while melanin and tyrosinase synthesis is not seen in the melanocytes of albino follicles. The findings indicate that the selective melanocytotoxicity of 4-S-CAP is manifested by lysis and necrosis of cells which are actively engaged in melanin synthesis. 4-S-CAP appears to provide a new modality for rational chemotherapy of malignant melanoma.

Footnotes

  • ↵1 This study was supported by Grants-In-Aid for Cancer Research (No. 6048250) from the Ministry of Education, Science and Culture, and No. 61-9 from the Ministry of Welfare.

  • ↵2 To whom requests for reprints should be addressed, at Department of Dermatology, Sapporo Medical College, Minami-1, Nishi-16, Sapporo 060, Japan.

  • Received December 18, 1986.
  • Revision received March 10, 1987.
  • Accepted March 18, 1987.
  • ©1987 American Association for Cancer Research.
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June 1987
Volume 47, Issue 12
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Selective Cytotoxicity of 4-S-Cysteaminylphenol on Follicular Melanocytes of the Black Mouse: Rational Basis for Its Application to Melanoma Chemotherapy
Yoshiko Ito and Kowichi Jimbow
Cancer Res June 15 1987 (47) (12) 3278-3284;

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Selective Cytotoxicity of 4-S-Cysteaminylphenol on Follicular Melanocytes of the Black Mouse: Rational Basis for Its Application to Melanoma Chemotherapy
Yoshiko Ito and Kowichi Jimbow
Cancer Res June 15 1987 (47) (12) 3278-3284;
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