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Cysteinyldopa isomers and dopa in lesions and urine of Japanese patients with malignant melanoma

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Summary

Cysteinyldopas and Dopa in the urine and tissues of Japanese melanoma patients were investigated quantitatively by means of high-performance liquid chromatography. Cysteinyldopa isomers were detected in the urine of eumelanic Japanese patients. The amount \(\bar X\) of each isomer of cysteinyldopa in the urine was 80.26±4.66% in 5-S-cysteinyldopa, 9.39±1.64% in 2-S-cysteinyldopa, 7.07±3.33% in 2, 5-S, S-dicysteinyldopa, and 3.28±1.43% in 6-S-cysteinyldopa. The amount of cysteinyldopa in melanoma tissues was 26–314 times more than that of Dopa. The amount \(\bar X\) of cysteinyldopa in the tissues was 80.34±1.75% in 5-S-cysteinyldopa, 11.06±1.91% in 2-S-cysteinyldopa, 6.27±1.43% in 2, 5-S, S-dicysteinlydopa, and 2.34±0.61% in 6-S-cysteinyldopa. The fact that the percentages of each isomer of cysteinyldopa in the urine and in the tissues were approximately constant suggests that the cysteinyldopas secreted from melanoma cells were excreted into the urine without being metabolized.

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Correspondence to Takafumi Morishima.

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Supported in part by a Research Grant from the Japanese Dermatological Association

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Morishima, T., Tatsumi, F., Fukada, E. et al. Cysteinyldopa isomers and dopa in lesions and urine of Japanese patients with malignant melanoma. Arch Dermatol Res 275, 76–79 (1983). https://doi.org/10.1007/BF00412878

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Key words

  • Cysteinyldopas
  • Dopa
  • Melanoma
  • Melanin