Linking αMSH with PPARγ in B16-F10 melanoma

Authors

  • Vittoria Maresca,

    1.  Laboratory of Cutaneous Physiopathology and Integrated Centre of Metabolomics Research, San Gallicano Dermatological Institute (IRCCS), Rome, Italy
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    • These authors contributed equally to this work.

  • Enrica Flori,

    1.  Laboratory of Cutaneous Physiopathology and Integrated Centre of Metabolomics Research, San Gallicano Dermatological Institute (IRCCS), Rome, Italy
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    • These authors contributed equally to this work.

  • Emanuela Camera,

    1.  Laboratory of Cutaneous Physiopathology and Integrated Centre of Metabolomics Research, San Gallicano Dermatological Institute (IRCCS), Rome, Italy
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  • Barbara Bellei,

    1.  Laboratory of Cutaneous Physiopathology and Integrated Centre of Metabolomics Research, San Gallicano Dermatological Institute (IRCCS), Rome, Italy
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  • Nicaela Aspite,

    1.  Laboratory of Cutaneous Physiopathology and Integrated Centre of Metabolomics Research, San Gallicano Dermatological Institute (IRCCS), Rome, Italy
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  • Matteo Ludovici,

    1.  Laboratory of Cutaneous Physiopathology and Integrated Centre of Metabolomics Research, San Gallicano Dermatological Institute (IRCCS), Rome, Italy
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  • Caterina Catricalà,

    1.  Department of Dermatological Oncology San Gallicano Dermatological Institute (IRCCS), Rome, Italy
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  • Giorgia Cardinali,

    1.  Laboratory of Cutaneous Physiopathology and Integrated Centre of Metabolomics Research, San Gallicano Dermatological Institute (IRCCS), Rome, Italy
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  • Mauro Picardo

    1.  Laboratory of Cutaneous Physiopathology and Integrated Centre of Metabolomics Research, San Gallicano Dermatological Institute (IRCCS), Rome, Italy
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M. Picardo, e-mail: picardo@ifo.it

Summary

We have discovered a new α-melanocyte stimulating hormone (α-MSH)/peroxisome proliferator activated receptor-γ (PPAR-γ) connection in B16-F10 cells. Both PPAR-γ up-regulation and its induction as an active transcription factor were observed in response to α-MSH. The α-MSH/PPAR-γ connection influenced both pigmentation and proliferation. The forskolin-stimulated cAMP/PKA pathway was not able to induce either PPAR-γ translocation into the nucleus or PPAR-γ transcriptional activity. As the melanocortin-1 receptor, the specific receptor for the α-MSH, is a G-protein coupled receptor, we wondered whether the phosphatidylinositol [PI(4,5)P2/PLCβ] signal pathway was involved in mediating the α-MSH-dependent PPAR-γ activation. Employing inhibitors of PI(4,5)P2/PLCβ pathway, the results of our experiments suggested that this pathway was promoted by α-MSH and that α-MSH played a role in mediating PPAR-γ activation. We have demonstrated, for the first time, that α-MSH induces the PI(4,5)P2/PLCβ pathway, through analysis of the basic steps of the pathway. The α-MSH effect on PPAR-γ was independent of animal species and was not correlated with the physio-pathological status.

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