miR-221-5p_R-4 regulates internalized trehalose-induced autophagy by targeting NRBF2 in porcine granulosa cells.

Trehalose, as a food and feed additive, can regulate physiological and pathological processes by activating autophagy, yet the molecular mechanism of trehalose dominated a rise in autophagy has not been elucidated. This study investigated the mechanisms of trehalose-induced autophagy in porcine granulosa cells (PGCs). Trehalose was internalized into PGCs by endocytosis and caused a temporary change of the lysosome pH, ultimately inducing autophagy. Furthermore, miRNA-seq analysis of PGCs indicated that trehalose upregulated the expression of miR-221-5p_R-4, which can target nuclear receptor binding factor 2 (NRBF2) to induce autophagy of PGCs. In summary, this study reveals that miR-221-5p_R-4 targeting NRBF2 was involved in the autophagy of PGCs challenged by trehalose, which was taken up by PGCs through endocytosis.