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*
Department of Experimental Medicine and Biochemical Sciences and
Division of Obstetrics and Gynecology, University of Rome Tor Vergata, Rome, Italy; and
Fatebenefratelli Association for Research, San Giovanni Calibita Hospital, Rome, Italy
Physiological concentrations of progesterone stimulate the activity
of the endocannabinoid-degrading enzyme anandamide hydrolase (fatty
acid amide hydrolase, FAAH) in human lymphocytes. At the same
concentrations, the membrane-impermeant conjugate of progesterone with
BSA was ineffective, suggesting that binding to an intracellular
receptor was needed for progesterone activity. Stimulation of FAAH
occurred through up-regulation of gene expression at transcriptional
and translational level, and was partly mediated by the Th2 cytokines.
In fact, lymphocyte treatment with IL-4 or with IL-10 had a stimulating
effect on FAAH, whereas the Th1 cytokines IL-12 and IFN-
reduced the
activity and the protein expression of FAAH. Human chorionic
gonadotropin or cortisol had no effect on FAAH activity. At variance
with FAAH, the lymphocyte anandamide transporter and cannabinoid
receptors were not affected by treatment with progesterone or
cytokines. Good FAAH substrates such as anandamide and
2-arachidonoylglycerol inhibited the release of leukemia-inhibitory
factor from human lymphocytes, but
N-palmitoylethanolamine, a poor substrate, did not. A
clinical study performed on 100 healthy women showed that a low FAAH
activity in lymphocytes correlates with spontaneous abortion, whereas
anandamide transporter and cannabinoid receptors in these cells remain
unchanged. These results add the endocannabinoids to the
hormone-cytokine array involved in the control of human
pregnancy.
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