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Localization of pendrin in mouse kidney.

Susan M Wall¹, Kathryn A Hassell, Ines E Royaux

¹Department of Medicine, University of Texas Medical School at Houston, 77030, USA.

American Journal of Physiology. Renal Physiology

|October 22, 2002

Summary

Pendrin, an anion exchanger, is found in mouse kidney distal convoluted tubules, connecting tubules, and cortical collecting ducts. Its protein distribution varies between intercalated cell types.

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Area of Science:

Nephrology
Cell Biology
Molecular Biology

Background:

Pendrin is an anion exchanger primarily known to be expressed in type B intercalated cells of the cortical collecting duct (CCD).
The precise localization of pendrin in other nephron segments and its expression in the proximal tubule remain subjects of debate and investigation.

Purpose of the Study:

To investigate the distribution of pendrin mRNA and protein expression in the mouse kidney.
To clarify the cellular and subcellular localization of pendrin within different nephron segments.

Main Methods:

Quantitative real-time PCR was employed to assess mRNA expression levels.
Light and electron microscopic immunohistochemistry techniques were used for protein localization studies.
Morphometric analysis was performed to quantify subcellular distribution differences.

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Main Results:

Pendrin mRNA is predominantly expressed in the renal cortex, with significantly higher levels in the CCD and connecting tubule (CNT) compared to other segments.
Pendrin protein is detected in distal convoluted tubule cells, and in both type B and non-A-non-B intercalated cells of the CNT and CCD.
Subcellular localization differs: intense apical plasma membrane labeling in non-A-non-B intercalated cells, and apical cytoplasmic vesicles in type B intercalated cells.

Conclusions:

Pendrin expression is confirmed in the distal convoluted tubule, CNT, and CCD of the mouse kidney.
The study reveals distinct subcellular localization patterns of pendrin in different intercalated cell types, suggesting functional specialization.
These findings enhance our understanding of pendrin's role in renal anion transport and its distribution within the nephron.