Abstract

Since the discovery of interferon-tau (IFNT) over 30 years ago as the trophectodermal cytokine responsible for the maintenance of the maternal corpus luteum (CL) in ruminants, exhaustive studies have been conducted to identify genes and gene products related to CL maintenance. Recent studies have provided evidence that although CL maintenance, with the up- and down-regulation of IFNT, is important, its regulatory role in the endometrial expression of interferon-stimulated genes (ISGs) is far more important for conditioning the uterine environment for successful conceptus implantation and thereafter. This review initially describes the mammalian implantation process, briefly but focuses on recent findings, as there appears to be a common phenomenon during early to mid-pregnancy among mammalian species.

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