PMID: 9179917May 1, 1997Paper

Immunohistochemical localization of lipoperoxidation products in normal human placenta

Placenta
A CasascoA Farina

Abstract

4-Hydroxynonenal (4-HNE) is a major propagation product of lipid peroxidation that is supposed to be responsible for some of the effects associated with oxidative stress in tissues. We have investigated the possible occurrence and distribution of 4-HNE-immunoreactivity in human normal placenta using immunocytochemistry. Specific immunostaining was observed in cytotrophoblast cells, syncytiotrophoblast, some cells of the villous mesenchyme and some endothelial cells of first trimester and term placentae. The detection of 4-HNE-immunoreactivity in placenta raises the question whether lipoperoxidation products are produced locally in placental cells or represent exogenous products that derive from maternal blood flow. Since trophoblastic cells and villous macrophages are provided by a scavenger receptor, it is conceivable that these cells may play a protective role with regard to the diffusion of lipoperoxidation products from the mother to the embryo. However, since a significant degree of lipid oxidative modification does not take place in plasma, it is presumed that 4-HNE is a local product of placental metabolism. In line with this hypothesis, it is proposed that maternal low density lipoproteins, which are the major source of...Continue Reading

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