Autores/as
Resumen
El objetivo de la presenta revisión es describir los conceptos actuales sobre el mecanismo local de la cascada de desarrollo y regresión del cuerpo lúteo (CL) regulado por macrófagos, células inmunológicas y citoquinas. El CL de la vaca es un órgano dinámico, el cual tiene una vida media de aproximadamente 17 a 18 días. La principal función del CL es secretar grandes cantidades de progesterona (P4). Cuando el CL madura, las células esteroidogénicas establecen contacto con muchos capilares. Además, el CL maduro está compuesto de muchas células endoteliales vasculares, las cuales pueden alcanzar hasta el 50 % de todas las células del CL. En el ganado bovino y otras especies, el CL juega un papel central en la regulación de la ciclicidad y en el mantenimiento de la preñez. En muchas especies, la regresión luteal es iniciada por la liberación uterina de prostaglandina F2α (PGF2α), la cual inhibe la esteroidogénesis, desencadenando una cascada de eventos que llevan a la desaparición final del tejido. Las células inmunes, principalmente los macrófagos y los linfocitos T, son importantes para la ingestión de los restos celulares que resultan de la muerte de las células luteales. Los macrófagos son células multifuncionales que juegan un papel clave en la respuesta inmune y son abundantes en todo el tejido reproductivo de la hembra. Su localización específica y las variaciones de la distribución en el ovario durante los diferentes estados del ciclo, sugieren que los macrófagos juegan diversas funciones en los eventos intraováricos, lo que incluye: la foliculogénesis, la reestructuración del tejido en la ovulación y la formación y regresión del CL.
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