Physiological dilation of uteroplacental arteries in the guinea pig depends on nitric oxide synthase activity of extravillous trophoblast

Cell and Tissue Research
A K NanaevP Kaufmann

Abstract

The trophoblast invasion of uteroplacental arteries in the guinea pig has been studied by means of electron microscopy and immunohistochemisty. To identify trophoblast cells, smooth muscle cells, and endothelial cells, antibodies against cytokeratins, smooth muscle myosin, desmin, and vimentin were employed. Furthermore, the immunohistochemical expression patterns of nitric oxide synthase isoforms (eNOS, mNOS and bNOS) were studied and were compared with the enzyme histochemical staining for NADPH-diaphorase. Dilation of uteroplacental arteries begins prior to day 30, when trophoblast cells that coexpress endothelial and macrophage nitric oxide synthase can be found in the vicinity of the vessels and replace the surrounding peritoneal mesothelium. Trophoblast invasion of the arterial walls and the subsequent wall destruction are only secondary effects. Starting around day 50, the final steps of pregnancy-dependent vessel modifications involve intraarterial trophoblast adhesion to the endothelium and subsequent replacement of the endothelium by the trophoblast cells. These may centrifugally invade the vessel media eventually forming intraluminal plugs. These findings led us to the conclusion that in the guinea pig pregnancy-indu...Continue Reading

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