Las palomas utilizan células de hierro en el hígado para orientarse

Un nuevo estudio revela que las palomas mensajeras dependen de células inmunitarias ricas en hierro en sus hígados para detectar el campo magnético de la Tierra. El descubrimiento ofrece una nueva explicación sobre cómo las aves se orientan en largas distancias, especialmente durante condiciones meteorológicas adversas.

Investigadores de instituciones como la Universidad de Bonn y el Instituto Max Planck de Comportamiento Animal descubrieron que los macrófagos en el hígado acumulan hierro y exhiben fuertes propiedades magnéticas. Estas células se encuentran cerca de las fibras nerviosas, lo que sugiere una vía para que las señales magnéticas lleguen al cerebro.

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Scientific illustration showing intestinal tuft cells signaling the brain via acetylcholine, serotonin, and the vagus nerve to suppress appetite during parasitic infections.
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Intestinal cells signal brain to curb hunger during parasitic infections

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A team led by David Julius, the 2021 Nobel Prize winner in Medicine, has described the molecular mechanism by which intestinal tuft cells signal the brain to suppress appetite during parasitic infections. Published today in Nature, the study identifies communication via acetylcholine and serotonin that activates the vagus nerve. The finding could aid treatments for conditions like irritable bowel syndrome.

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