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. 1996 Apr 2;93(7):2915–2919. doi: 10.1073/pnas.93.7.2915

Recombinant human uteroglobin suppresses cellular invasiveness via a novel class of high-affinity cell surface binding site.

G C Kundu 1, G Mantile 1, L Miele 1, E Cordella-Miele 1, A B Mukherjee 1
PMCID: PMC39734  PMID: 8610142

Abstract

The mechanism(s) that regulates invasion of trophoblasts through the uterine epithelium during embryo implantation and nidation in hemochorial placental mammals is poorly understood. While limited trophoblast invasion is essential for the establishment of normal pregnancy, dysregulation of this process may contribute to the pathogenesis of choriocarcinoma, a highly invasive and lethal form of cancer arising from the trophoblasts. We have previously demonstrated that rabbit uteroglobin (UG), a cytokine-like, antiinflammatory protein, produced by the endometrial epithelium during pregnancy, has a potent antichemotactic effect on neutrophils and monocytes in vitro. Here, we report that recombinant human UG (hUG) dramatically suppresses invasion of human trophoblasts and NIH 3T3 cells through an artificial basement membrane (Matrigel) in vitro but has no effect on that of human choriocarcinoma cells. We identified a previously unreported high-affinity, high molecular weight (approximately 190 kDa), nonglycosylated hUG-binding protein, readily detectable on human trophoblasts and NIH 3T3 cells but totally lacking on choriocarcinoma cells. Taken together, these results raise the possibility that (i) hUG plays a critical role in regulating cellular invasiveness, at least in part, via its previously unrecognized cell surface binding site, and (ii) some of the numerous biological activities of proteins of the UG family, reported so far, may be mediated via this binding site.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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