Selective 2-[18F]fluorodopa uptake for melanogenesis in murine metastatic melanomas

K. Ishiwata, K. Kubota, R. Kubota, Ren Iwata, T. Takahashi, T. Ido

    Research output: Contribution to journalArticlepeer-review

    21 Citations (Scopus)

    Abstract

    The relationship between 3,4-dihydroxy-2-[18F]fluoro-L-phenylalanine (2-[18F]FDOPA) uptake and melanogenesis was studied using mice bearing two B16 melanomas: B16-F1 has a higher melanin synthesis ability and a slower growing rate than the higher metastatic B16-F10. A significantly higher 2-[18F]FDOPA uptake by B16-F1 than by B16-F10 and a reverse relationship for the uptake of [14C]2-deoxy-2-fluoro-D-glucose and [3H]thymidine were observed 1 hr postinjection. F1-to-F10 ratios of both the 2-[18F]FDOPA uptake and the acid-insoluble radioactivity increased to about 5 at 6 hr, which paralleled the melanin content. FM3A mammary carcinoma showed a 2-[18F]FDOPA uptake similar to the B16-F10 but without the acid-insoluble radioactivity. With D,L-DOPA loading, a 55% decreased uptake by FM3A 1 hr postinjection was significantly greater than the 20% reduction in both melanomas. O-Methylated 2-[18F]FDOPA was a predominant acid-soluble metabolite in all tumors. Whole-body autoradiography discriminated the two melanomas clearly. 2-[18F]FDOPA may be a promising tracer for the selective imaging of melanogenesis.

    Original languageEnglish
    Pages (from-to)95-101
    Number of pages7
    JournalJournal of Nuclear Medicine
    Volume32
    Issue number1
    Publication statusPublished - 1991 Jan 1

    ASJC Scopus subject areas

    • Radiology Nuclear Medicine and imaging

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