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Am J Physiol Gastrointest Liver Physiol 283: G975-G985, 2002. First published July 3, 2002; doi:10.1152/ajpgi.00528.2001
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Vol. 283, Issue 4, G975-G985, October 2002

Region-specific adaptation of apical Na/H exchangers after extensive proximal small bowel resection

Mark W. Musch1, Cres Bookstein1, Flavio Rocha1, Alvaro Lucioni1, Hongyu Ren1, Janet Daniel1, Yue Xie1, Rebecca L. McSwine1, Mrinalini C. Rao2, John Alverdy3, and Eugene B. Chang1

1 The Martin Boyer Laboratories, 3 Department of Surgery, University of Chicago, Chicago 60637; and 2 Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois 60612

After massive small bowel resection (MSBR), the remnant small intestine adapts to restore Na absorptive function. The possibility that this occurs through increases in cellular Na absorptive capacity was examined by assessing the regional effects of 50% proximal MSBR on the function and expression of the apical membrane Na/H exchangers (NHEs) NHE2 and NHE3. Morphometric analysis confirmed adaptive changes consistent with villus hypertrophy, particularly distal to the anastomosis. Villus epithelium prepared by light mucosal scrapings from 2-wk-postresected and -posttransected control rats exhibited comparable brush-border hydrolase activities, total cell protein per DNA, and villin expression but increased basolateral Na-K-ATPase activity. Parallel increases of two- to threefold in protein and mRNA abundance of NHE2 and NHE3 were observed only in ileal regions distal to the anastomosis of resected rats. Basolateral NHE1 expression was unchanged. After 80% resection, increases in NHE2 and NHE3 became evident in proximal colon. We conclude that increased enterocyte expression and function of apical membrane NHEs in regions distal to the anastomosis play a role in the adaptive process after MSBR. The increased luminal Na load to distal bowel regions after proximal resection may stimulate increases in apical membrane NHE gene transcription and protein expression.

sodium transport; sodium/hydrogen exchange; intestinal surgery; intestinal adaptation; diarrhea; malabsorption; epithelial cell; intestinal physiology


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