Systems-level analysis of cell-specific AQP2 gene expression in renal collecting duct

Proceedings of the National Academy of Sciences of the United States of America - Tập 106 Số 7 - Trang 2441-2446 - 2009
Ming‐Jiun Yu1, R. Lance Miller2, Panapat Uawithya1, Markus M. Rinschen1, Sookkasem Khositseth1, Drew W. W. Braucht1, Chung‐Lin Chou1, Trairak Pisitkun1, Raoul D. Nelson2, Mark A. Knepper1
1Laboratory of Kidney and Electrolyte Metabolism, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892; and
2Department of Pediatrics, Division of Nephrology, University of Utah, Salt Lake City, UT 84132

Tóm tắt

We used a systems biology-based approach to investigate the basis of cell-specific expression of the water channel aquaporin-2 (AQP2) in the renal collecting duct. Computational analysis of the 5′-flanking region of the AQP2 gene (Genomatix) revealed 2 conserved clusters of putative transcriptional regulator (TR) binding elements (BEs) centered at −513 bp (corresponding to the SF1, NFAT, and FKHD TR families) and −224 bp (corresponding to the AP2, SRF, CREB, GATA, and HOX TR families). Three other conserved motifs corresponded to the ETS, EBOX, and RXR TR families. To identify TRs that potentially bind to these BEs, we carried out mRNA profiling (Affymetrix) in mouse mpkCCDc14 collecting duct cells, revealing expression of 25 TRs that are also expressed in native inner medullary collecting duct. One showed a significant positive correlation with AQP2 mRNA abundance among mpkCCD subclones ( Ets1 ), and 2 showed a significant negative correlation ( Elf1 and an orphan nuclear receptor Nr1h2 ). Transcriptomic profiling in native proximal tubules (PT), medullary thick ascending limbs (MTAL), and IMCDs from kidney identified 14 TRs (including Ets1 and HoxD3 ) expressed in the IMCD but not PT or MTAL (candidate AQP2 enhancer roles), and 5 TRs (including HoxA5 , HoxA9 and HoxA10 ) expressed in PT and MTAL but not in IMCD (candidate AQP2 repressor roles). In luciferase reporter assays, overexpression of 3 ETS family TRs transactivated the mouse proximal AQP2 promoter. The results implicate ETS family TRs in cell-specific expression of AQP2 and point to HOX, RXR, CREB and GATA family TRs as playing likely additional roles.

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Proceedings of the National Academy of Sciences of the United States of America

Tập 106 Số 7

2441-2446

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