Cell specific qRT-PCR of renal epithelial cells reveals a novel innate immune signature in murine collecting duct.

Cell specific qRT-PCR of renal epithelial cells reveals a novel innate immune signature in murine collecting duct. Am J Physiol Renal Physiol. 2017 May 03;:ajprenal.00512.2016 Authors: Saxena V, Hains DS, Ketz J, Chanley M, Spencer JD, Becknell B, Pierce KR, Nelson RD, Purkerson JM, Schwartz GJ, Schwaderer AL Abstract The urinary tract is usually culture negative despite its close proximity to microbial flora. The precise mechanisms by which the kidneys and urinary tract defends against infection is not well understood. The initial kidney cells to encounter ascending pathogens are the collecting tubule cells which consist of principal cells (PCs) that express aquaporin 2 (AQP2) and intercalated cells (ICs) that express vacuolar H+-ATPase (V-ATPase, B1 subunit). We have previously shown that ICs are involved with the human renal innate immune defense. Here we generated two reporter mice, VATPase B1-cre+tdT+ mice to fluorescently label ICs and AQP2-cre+tdT+ mice to fluorescently label PCs and then performed flow sorting to enrich PCs and ICs for analysis. Isolated ICs and PCs along with proximal tubular cells were used to measure anti-microbial peptide (AMP) mRNA expression. ICs and PCs were significantly enriched for AMPs. Isolated ICs responded to uropathogenic Escherichia coli (UPEC)challenge in vitro and had higher RNase4 gene expression than control while both ICs and PCs responded to UPEC challenge in vivo by upregulating Defb1 m...
Source: Am J Physiol Renal P... - Category: Urology & Nephrology Authors: Tags: Am J Physiol Renal Physiol Source Type: research