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CD56+ CD16- granulated lymphocytes, termed endometrial granulated lymphocytes (eGLs), have been suggested to play a role in the maintenance of human pregnancy, although their in vivo function in both pregnant and nonpregnant endometrium remains unknown. The present study compared the cytotoxic activity of CD56+ CD16- eGLs (&gt; 98% purity) positively selected from early and late proliferative-phase, early and late secretory-phase, and menstrual-phase endometrium with that of CD56+ CD16- eGLs purified from first-trimester decidua and CD56+ predominantly CD16+ cells from peripheral blood. From the late proliferative phase onwards, the major histocompatibility complex (MHC)-nonrestricted cytotoxic activity of eGLs was comparable between phases of the menstrual cycle. In contrast, eGLs from early proliferative-phase endometrium displayed significantly lower cytotoxic activity. With the exception of eGLs purified from early proliferative-phase endometrium, the cytotoxic activity of CD56+ CD16- eGLs purified from nonpregnant endometrium was comparable to that of CD56+ CD16- eGLs in decidua and CD56+ predominantly CD16+ cells from peripheral blood. No endogenous lymphokine-activated killer cell activity was detected in eGLs from endometrium or decidua. The present study using highly purified eGLs demonstrates that, with the exception of early proliferative-phase samples, CD56+ CD16- eGLs from nonpregnant endometrium and early pregnancy decidua have cytotoxic activity comparable to that of "classical" natural killer cells from peripheral blood.

Cytotoxic Activity of Endometrial Granulated Lymphocytes during the Menstrual Cycle in Humans1