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Lookup NU author(s): Professor John Lunec,
Professor Anthony Thody
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In this study we have compared the effects of different pro-opiomelanocortin (POMC) peptides on melanogenesis and metastasis and their relationship to MSH receptor expression in B16F1 melanoma cells. All peptides, apart from beta-endorphin, increased melanogenesis and the order of potency was Nle4DPhe7-alpha-MSH>alpha-MSH>ACTH[1-39]>des-acetyl alpha-MSH>ACTH[1-24]. A similar order of potency was found for metastasis, except for ACTH [1-24], which had a relatively greater effect on metastasis. These findings suggest that the effects on melanogenesis and metastasis are mediated via the same receptor. The results of ligand binding studies also indicated the presence of a single receptor with a K(D) value for Nle4DPhe7-alpha-MSH of 62+/-16pM. This was consistent with crosslinking studies using [I-125] Nle4DPhe7-alpha-MSH which produced a single 50-55 kD band on analysis by SDS-PAGE. However, the relative binding affinities of the different peptides, measured by displacement of [I-125]-Nle4DPhe7-alpha-MSH, did not closely correlate with the relative potencies in stimulating melanogenesis and metastasis. This suggests that receptor activation and the subsequent biological response is not determined solely by binding affinity.
Author(s): Lunec, J., Pieron, C., Thody, A.J.
Publication type: Article
Publication status: Unknown
Journal: Melanoma Research
Print publication date: 01/05/1992
ISSN (print): 0960-8931
ISSN (electronic): 1473-5636
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