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Claudin-7, a member of the claudin family, is highly expressed in distal nephrons of kidneys and has been reported to be involved in the regulation of paracellular Cl(-) permeability in cell cultures. To investigate the role of claudin-7 in vivo, we generated claudin-7 knockout mice (Cln7(-/-)) by the gene-targeting deletion method. Here we report that Cln7(-/-) mice were born viable, but died within 12 days after birth. Cln7(-/-) mice showed severe salt wasting, chronic dehydration, and growth retardation. We found that urine Na(+), Cl(-), and K(+) were significantly increased in Cln7(-/-) mice compared with that of Cln7(+/+) mice. Blood urea nitrogen and hematocrit were also significantly higher in Cln7(-/-) mice. The wrinkled skin was evident when Cln7(-/-) mice were approximately 1 wk old, indicating that they suffered from chronic fluid loss. Transepidermal water loss measurements showed no difference between Cln7(+/+) and Cln7(-/-) skin, suggesting that there was no transepidermal water barrier defect in Cln7(-/-) mice. Claudin-7 deletion resulted in the dramatic increase of aldosterone synthase mRNA level as early as 2 days after birth. The significant increases of epithelial Na(+) channel alpha, Na(+)-Cl(-) cotransporter, and aquaporin 2 mRNA levels revealed a compensatory response to the loss of electrolytes and fluid in Cln7(-/-) mice. Na(+)-K(+)-ATPase alpha(1) expression level was also greatly increased in distal convoluted tubules and collecting ducts where claudin-7 is normally expressed. Our study demonstrates that claudin-7 is essential for NaCl homeostasis in distal nephrons, and the paracellular ion transport pathway plays indispensable roles in keeping ionic balance in kidneys.
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Rodney Tatum
Yuguo Zhang
Kenneth J. Salleng
AJP Renal Physiology
Vanderbilt University Medical Center
East Carolina University
Atrium Health Wake Forest Baptist
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Tatum et al. (Thu,) studied this question.
www.synapsesocial.com/papers/6a01ec8e60baf37e2cd8c331 — DOI: https://doi.org/10.1152/ajprenal.00450.2009
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