Isolation and Analysis of Exosomal MicroRNAs from Ovarian Follicular Fluid.

Mammalian ovarian follicular growth is characterized by development of a large fluid filled antrum that separates mural granulosa cells and cumulus cells. Extensive communication between the different cell types is necessary for maturation of a developmentally competent oocyte. Here, we describe an approach for the isolation of cell-secreted exosomes from ovarian follicular fluid, identification of small RNAs (i.e., microRNAs) in exosomes, labeling of exosomes, and examining cell uptake of exosomes by follicular cells.