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Reducción de la señalización de Akr1b7 impulsa el envejecimiento ovárico y la disfunción reproductiva
Keishiro Isayama1,2, Kenji Watanabe1, Masato Ohtsuka3
1Institute of Gene Research, Yamaguchi University Science Research Center, Yamaguchi 755-8505, Japan.
iScience
|February 23, 2026
Resumen
La vía de la Aldo-ceto reductasa Akr1b7 es crucial para la fertilidad femenina. Su ausencia en ratones mayores conduce a una función ovárica alterada y a una reducción del éxito reproductivo.
Área de la Ciencia:
- Biología Reproductiva; Endocrinología; Biología Molecular
Sus antecedentes:
- El envejecimiento ovárico natural conduce a una disminución progresiva de la fertilidad femenina.; La comprensión de los mecanismos moleculares que subyacen a la disminución de la fertilidad relacionada con la edad es fundamental.
Objetivo del estudio:
- Investigar el papel de la vía de la Aldo-ceto reductasa Akr1b7 (Akr1b7) en el envejecimiento ovárico y la función reproductiva femenina.; Identificar factores moleculares que contribuyen a la pérdida de fertilidad asociada con la edad.
Principales métodos:
- Análisis integral de la expresión de ARN en ovarios de ratones envejecidos durante el ciclo estral.; Análisis fenotípico de ratones knockout para Akr1b7 (Akr1b7-/-), incluida la maduración de oocitos, el desarrollo folicular y los parámetros reproductivos.; Evaluación de los niveles hormonales y análisis de la expresión génica de enzimas esteroidogénicas clave.
Principales resultados:
- La activación transitoria de la vía Akr1b7 observada en ratones jóvenes estuvo ausente en ratones mayores.; Los ratones Akr1b7-/- mostraron una atenuación de la activación de Akt en oocitos, un desarrollo folicular alterado y un aumento de oocitos ovulados inmaduros.; La deficiencia de Akr1b7 resultó en un ciclo estral prolongado debido a una etapa de diestro prolongada y niveles sostenidos de progesterona.; Se observó una reducción en la expresión de Cyp17a1, una enzima metabolizadora de progesterona, en las células de la teca de ratones Akr1b7-/-.
Conclusiones:
- Akr1b7 actúa como un regulador clave de la señalización ovárica, la homeostasis hormonal y la función reproductiva.; La alteración de la vía Akr1b7 imita fenotipos asociados con la disminución de la fertilidad en hembras envejecidas.; La restauración de la función de la vía Akr1b7 puede ofrecer potencial terapéutico para la infertilidad relacionada con la edad.
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