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Abstract
Tumor Necrosis Factor-alpha (TNFalpha) is a pleiotrophic cytokine, affects either normal or tumor cells, and influences cellular differentiation. TNFalpha role in female reproduction has been proven to be mediated through an influence on prostaglandin (PGs) synthesis and output. To evaluate the possible role of TNFalpha in an auto-/paracrine regulation in the cat uterus, mRNA expression coding for TNFalpha and its receptors (TNFR1 and TNFR2), and TNFalpha protein content at different stages of the estrous cycle were investigated. Additionally, TNFalpha involvement in PG secretion at different stages of the estrous cycle was investigated by in vitro tissue culture. Gene expressions coding for TNFalpha and TNFR1 were the highest at diestrus (P < 0.05). TNFalpha protein expression was the lowest at interestrus (P < 0.05). Nevertheless, TNFR2 was not affected by the estrous stage. TNFalpha at a dose of 1 ng/ml significantly increased PGF2alpha secretion at estrus (P < 0.01) and PGE2 secretion at diestrus (P < 0.001) after 12h incubation. Overall findings indicate that TNFalpha locally produced in the cat's uterus, stimulates PG secretion in an estrous cycle-related manner.
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