Low Density Lipoprotein Receptor-Related Protein-2 Expression in Efferent Duct and Epididymal Epithelia: Evidence in Rats for its in Vivo Role in Endocytosis of Apolipoprotein J/Clusterin1

Apolipoprotein J/clusterin/sulfated glycoprotein-2 (apo J) disassociates from spermatozoa and is endocytosed by epithelial cells lining the efferent ducts and epididymis. The low density lipoprotein receptor-related protein-2/megalin (LRP-2) has been shown to bind to apo J and mediates its endocytosis and lysosomal degradation in cultured cells. In this study, immunocytological techniques were used to localize LRP-2 in rat efferent ducts and …