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Melanocyte-stimulating hormone (alpha-MSH) inhibits the growth of human malignant melanoma cells with the induction of phosphatidyl inositol and myo-inositol phosphate levels.

It has been shown that alpha-MSH inhibits the growth of amelanotic cells of human malignant melanoma (BRO) without their melanization or the expression of tyrosinase activity. alpha-MSH changed the activity of cytosol and microsomal forms of phosphatidyl inositol kinase and phosphatidyl inositol-4-phosphate kinase determining the concentration of phosphatidyl inositol-4-phosphate and phosphatidyl inositol-4,5-bisphosphate. It also induced an "outburst" in the levels of myo-inositol phosphates (mono-, bis- and 1,4,5-trisphosphates). Changes in the levels of myo-inositol phosphates occurred within seconds, and are suggested to play a certain part in the hormonal regulation of melanoma cell growth.