Inducible podocyte-specific gene expression in transgenic mice.

Shigehara T, Zaragoza C, Kitiyakara C, Takahashi H, Lu H, Moeller M, Holzman LB, Kopp JB
J Am Soc Nephrol. 2003 14 (8): 1998-2003

PMID: 12874453

The podocyte plays a key role in glomerular function and glomerular disease. To facilitate studies of podocyte function, we have developed a transgenic mouse model with inducible expression in the podocyte. The tetracycline-inducible transgenic system facilitates gene expression with restricted cellular distribution and tight temporal control. Recently, Bujard and colleagues have developed a functionally improved reverse tetracycline-controlled transcriptional activator (rtTA) with substantially lower background in the off state (the absence of tetracycline) and greater inducibility in the on state (the presence of tetracycline). We used the human podocin (NPHS2) gene promoter to control expression of the rtTA cassette and bred these mice with a reporter mouse line that contains the cytomegalovirus minimal promoter and tetO promoter elements together with LacZ, encoding beta-galactosidase. Dual transgenic mice, bearing both podocin-rtTA and tetO-LacZ transgenes, had no detectable expression in kidney or other organs in the absence of tetracycline. Administration of tetracycline in the drinking water was associated with podocyte expression of beta-galactosidase, in a fashion that was time dependent (maximal at 1 wk) and dose-dependent (maximal at 2 mg/ml). Podocyte expression was confirmed in two ways: histochemical staining for beta-galactosidase and double-immunostaining using the podocyte marker WT-1 and beta-galactosidase. This transgenic system should aid future investigations of podocyte function.

MeSH Terms (25)

Animals beta-Galactosidase Cytomegalovirus DNA Dose-Response Relationship, Drug Doxycycline Gene Expression Regulation Genes, Reporter Humans Kidney Kidney Glomerulus Lac Operon Mice Mice, Transgenic Microscopy, Fluorescence Plasmids Polymerase Chain Reaction Promoter Regions, Genetic Protein Structure, Tertiary Tetracycline Time Factors Tissue Distribution Transcription, Genetic Transcriptional Activation Transgenes

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