Summer heat stress (HS) negatively affects reproductive functions, including prostaglandin (PG) F2a secretion in the endometrium, and
decreases fertility in cattle. In the present study, we examined the effects of elevated temperatures on PG synthesis in oviductal epithelial
cells. The epithelial cells obtained from the ampulla and isthmus of the oviduct were incubated at various temperatures (38.5, 39.5, 40.0,
and 40.5 8C) for 24 h. In the ampulla, PGE2 concentration was higher at 40.5 8C than at 38.5 8C, while PGF2a production was not affected
by the temperatures in this range. The expressions of microsomal PGE synthase 1 (PTGES (mPGES1)), cytosolic PGES (PTGES3 (cPGES)),
and heat shock protein 90 (HSP90AA1 (HSP90)) mRNAs and proteins were higher at 40.5 8C than at 38.5 8C in the ampullary epithelial
cells. Seasonal changes in the expressions of PGES and HSP90AA1 mRNAs in oviductal tissues were also investigated. The expressions of
PTGES3 and HSP90AA1 mRNAs were higher in the ampullary tissues in summer than in winter. In summary, elevated temperatures
stimulated PGE2 production in the ampullary oviduct by increasing the expressions of PGESs and HSP90AA1, which can activate cPGES.
The overall results suggest that HS upsets PG secretions and reduces oviductal smooth muscle motility, which in turn could decrease
gamete/embryo transport through the oviduct
Summer heat stress (HS) negatively affects reproductive functions, including prostaglandin (PG) F2a secretion in the endometrium, anddecreases fertility in cattle. In the present study, we examined the effects of elevated temperatures on PG synthesis in oviductal epithelialcells. The epithelial cells obtained from the ampulla and isthmus of the oviduct were incubated at various temperatures (38.5, 39.5, 40.0,and 40.5 8C) for 24 h. In the ampulla, PGE2 concentration was higher at 40.5 8C than at 38.5 8C, while PGF2a production was not affectedby the temperatures in this range. The expressions of microsomal PGE synthase 1 (PTGES (mPGES1)), cytosolic PGES (PTGES3 (cPGES)),and heat shock protein 90 (HSP90AA1 (HSP90)) mRNAs and proteins were higher at 40.5 8C than at 38.5 8C in the ampullary epithelialcells. Seasonal changes in the expressions of PGES and HSP90AA1 mRNAs in oviductal tissues were also investigated. The expressions ofPTGES3 and HSP90AA1 mRNAs were higher in the ampullary tissues in summer than in winter. In summary, elevated temperaturesstimulated PGE2 production in the ampullary oviduct by increasing the expressions of PGESs and HSP90AA1, which can activate cPGES.The overall results suggest that HS upsets PG secretions and reduces oviductal smooth muscle motility, which in turn could decreasegamete/embryo transport through the oviduct
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