Binding of Pneumocystis carinii to the lung epithelial cell receptor HSPA5 (GRP78) Free

Abstract

The importance of lung macrophages in Pneumocystis–host interaction is well known, but little is known about the initial binding/colonization of the airway epithelium. Our prior studies have documented cell-signalling events that occur following binding of the organisms to lung epithelial cells; however, the receptors that mediate Pneumocystis attachment to lung surfaces have not yet been fully defined. Using affinity chromatography, we identified heat shock protein 5 (HSPA5), also known as GRP78, as a potential host receptor that may have relevance in Pneumocystis lung colonization. Pneumocystis carinii (Pc) organisms not only bound HSPA5 on a rat lung epithelial cell line, but also on primary rat airway epithelial cells (AECs). Furthermore, Pc bound CHO1 cells overexpressing HSPA5 more than the CHO1 parent line alone, supporting a role for Pc–HSPA5 protein interaction in mediating organism attachment. These results provide new insights into the interactions of Pneumocystis with host lung epithelium.

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2018-10-17
2024-03-29
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