Glycan profile of oviductal isthmus epithelium in normal and superovulated ewes

Theriogenology
Salvatore DesantisG M Lacalandra

Abstract

Glycans of oviductal isthmus are implicated in sperm-isthmus interaction, sperm storage, survival, and capacitation. Isthmus morphology and glycoprotein production are controlled by sex steroids, which could be responsible for alterations of some reproductive events in the superovulated ewes (SE). In this study, the oviductal isthmus epithelium was evaluated in normal and in SE using morphologic and lectin histochemical analysis. The epithelium of normal isthmi was significantly taller in folds than in crypts, whereas it significantly decreased in the folds of SE. Nonciliated cells (NCs) from normal, showed apical blebs revealing apocrine secretory activity, which was missing in SE. The quantitative analysis of lectin staining revealed higher Con A, DBA, and PNA reactivity but lower affinity to KOH-sialidase- (Ks)WGA, GSA II, LTA, UEA I, SBA, GSA I-B4, RCA120, KsPNA, MAL II, SNA in control isthmi compared with superovulated ones. The NCs apical blebs showed terminal fucose (Fuc), N-acetylgalactosamine (GalNAc), galactose (Gal), lactosamine, and O- and N-sialoglycans. In normal isthmi, the luminal surface of NCs and ciliated cells expressed Fuc, highly mannosilated N-glycans terminating with lactosamine as well as O-glycans endi...Continue Reading

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