Human fallopian tubes express prostacyclin (PGI) synthase and cyclooxygenases and synthesize abundant PGI.

Animal studies unequivocally support the indispensable role of prostaglandin (PG) and cyclooxygenase (COX) in ovulation and implantation. Available data also suggest that PG and COX may be important in the transport of embryos. The effects of PGE(2) and PGF(2alpha) on the contractility of human tubal muscle have been studied extensively; the expression of COX in human fallopian tubes was also reported.