Basic fibloblast growth factor and its receptors in relation to proliferative activity in the buffalo placenta during gestation

The space-temporal expression of basic fibroblast growth factor (bFGF), fibroblast growth factor receptor 1 (FGFR1) and fibroblast growth factor receptor 2 (FGFR2) in buffalo placenta and correlation to proliferative activity was studied. For the localization of bFGF, FGFR1, FGFR2 and Ki-67, 12 buffalo placentas from initial, middle and final gestational thirds were collected and immunohistochemistry tests were performed. Expression of bFGF and its receptors was detected and analyzed from the initial third until the end of gestation. In the fetal compartment, positive correlations were observed between the expression of bFGF and Ki-67, FGFR1 and Ki-67, besides FGFR2 and Ki-67 (r=0.313, 0.358 and 0.384, respectively). High correlations were found between FGFR1 and Ki-67 in maternal epithelium and stroma (r=0.789 and r=0.511, respectively). The results suggest that bFGF, FGFR1 and FGFR2 may be involved in the modulation of trophoblast proliferation, whereas maternal compartment proliferation in the buffalo placenta would only be modulated by FGFR1.

buffalo; placenta; fibroblast growth factor; pregnancy