From Skin to Brain: Antagonism and Parallelism in the MCH and MSH Systems

Apr 25, 2026Annals of the New York Academy of Sciences

Opposing and parallel roles of the brain's sleep and skin pigment systems

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Abstract

MCH and MSH systems may play opposing roles in regulating energy balance and circadian rhythms.

MCH induces melanosome aggregation in low light, while MSH promotes their dispersion for ultraviolet protection.
In the brain, MCH is associated with increased feeding and sleep, whereas MSH is linked to satiety and wakefulness.
MCH shortens neuronal primary cilia, while MSH elongates them, paralleling their effects on melanosomes.
Both MCH and MSH actions depend on the regulation of cellular transport processes by cAMP-PKA.
Disruptions in MCH and MSH signaling may contribute to various metabolic and neuropsychiatric disorders.

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The melanin-concentrating hormone (MCH) and melanocyte-stimulating hormone (MSH, α-MSH) systems are examples of functional antagonism built upon mechanistic parallelism. Evolved from light-responsive pigment mechanisms, these peptides were repurposed into hypothalamic circuits regulating energy balance, circadian rhythms, and complex behaviors. Their antagonism manifests across multiple biological scales. In the skin, MCH induces melanosome aggregation in low light, whereas MSH promotes their dispersion for ultraviolet protection. In the brain, this pigmentary logic was repurposed into circadian and metabolic regulation: MCH promotes feeding, energy conservation, and sleep, while MSH drives satiety, thermogenesis, and wakefulness. Strikingly, their antagonism extends to subcellular organelles. MCH shortens neuronal primary cilia, whereas MSH elongates them, paralleling their opposite actions on melanosomes. Both processes depend on cAMP-PKA-regulated microtubule transport, reflecting a conserved cellular architecture probably rooted in the shared neural crest origins of melanocytes and neurons. Importantly, these pathways remain tightly entrained to the circadian clock, translating external light-dark cycles into rhythmic control of skin pigmentation and the body's internal metabolic state. Disruptions of these systems contribute to diverse metabolic and neuropsychiatric disorders, often through opposite imbalances of signaling, and understanding this deep evolutionary continuity reveals new therapeutic targets, from receptor ligands to circadian interventions and cilia-targeted therapies.

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From Skin to Brain: Antagonism and Parallelism in the MCH and MSH Systems

Abstract

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