Detection of Functionally Active Melanocortin Receptors and Evidence for an Immunoregulatory Activity of Alpha-Melanocyte-Stimulating Hormone in Human Dermal Papilla Cells
August 2005
in “
Endocrinology
”
α-Melanocyte-Stimulating Hormone αMSH proopiomelanocortin POMC adrenocorticotropic hormone ACTH β-endorphin melanocortin-1 receptor MC1R melanocortin-4 receptor MC4R intercellular adhesion molecule-1 ICAM-1 interferon-γ inflammatory alopecia dermal papilla cells DPCs alpha-MSH alpha-Melanocyte-Stimulating Hormone interferon gamma inflammatory hair loss hair follicle cells
Studysummary This study suggests that αMSH may play a regulatory role in human dermal papilla cells, potentially influencing immune and inflammatory responses in hair follicles, which could contribute to inflammatory alopecia.
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The study investigated the expression and role of the proopiomelanocortin (POMC) system in human dermal papilla cells (DPCs), which are crucial for regulating hair follicle activity. It was found that these cells expressed POMC and were immunoreactive for ACTH, αMSH, and β-endorphin. Human DPCs expressed functionally active melanocortin-1 and melanocortin-4 receptors, as evidenced by αMSH-induced increases in intracellular cAMP and calcium. The study also demonstrated that αMSH could counteract the expression of intercellular adhesion molecule-1 induced by interferon-γ, suggesting an immunoregulatory role. The findings indicated that αMSH might regulate immune and inflammatory responses in the hair follicle, and its disruption could contribute to inflammatory alopecia.
