[No authors listed]
Adiponectin, one of the several adipocytokines secreted mainly by the adipose tissue, plays an important role in regulating energy homeostasis and controls female fertility. Female reproductive functions are closely associated with nutritional status, and adiponectin seems to be an important factor linking the regulation of metabolic homeostasis with reproductive processes. The biological activity of adiponectin is mediated by two distinct receptors, adiponectin receptor 1 (AdipoR1) and adiponectin receptor 2 (AdipoR2). The objective of this study was to determine the presence of and changes in the gene and protein expression pattern of adiponectin and its receptors in the porcine uterus during early pregnancy and on Days 10 to 11 of the estrous cycle and in the conceptus and trophoblast. The highest level of adiponectin transcript was observed on Days 15 to 16 of gestation, Days 10 to 11 of the cycle in the endometrium, and Days 15 to 16 of gestation in the myometrium. The highest expression of AdipoR1 and AdipoR2 genes was detected on Days 10 to 11 of gestation in the endometrium, and Days 12 to 13 in the myometrium. The highest content of adiponectin protein was noted on Days 12 to 13 and 30 to 32 of gestation in the endometrium and Days 10 to 11 of the cycle in the myometrium. The expression of adiponectin protein was higher on Days 27 to 28 and 30 to 32 in the conceptuses. AdipoR1 protein content in the myometrium was highest on Days 12 to 13 and 30 to 32. In contrast, in the endometrium, it was more constant. The highest content of AdipoR2 protein was detected on Days 15 to 16 and 30 to 32 of gestation, Days 10 to 11 of the cycle in the endometrium, and Days 10 to 11 of gestation in the myometrium. In the conceptuses, the highest AdipoR1 protein content was observed on Days 15 to 16, and the highest AdipoR2 protein expression was determined on Days 15 to 16 and 27 to 28. In the trophoblasts, AdipoR1 protein content was higher on Days 27 to 28 than on Days 30 to 32, whereas the expression of AdipoR2 was higher on Days 30 to 32. This study demonstrated the presence of adiponectin and its receptors in the uteri, conceptuses, and trophoblasts of pregnant pigs and that the local adiponectin system is dependent on the stage of pregnancy.
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