Pflügers Archiv - European Journal of Physiology

, Volume 461, Issue 5, pp 579–589

Rotavirus toxin NSP4 induces diarrhea by activation of TMEM16A and inhibition of Na+ absorption

  • Jiraporn Ousingsawat
  • Myriam Mirza
  • Yuemin Tian
  • Eleni Roussa
  • Rainer Schreiber
  • David I. Cook
  • Karl Kunzelmann
Transport Physiology

DOI: 10.1007/s00424-011-0947-0

Cite this article as:
Ousingsawat, J., Mirza, M., Tian, Y. et al. Pflugers Arch - Eur J Physiol (2011) 461: 579. doi:10.1007/s00424-011-0947-0

Abstract

Rotavirus infection is the most frequent cause for severe diarrhea in infants, killing more than 600,000 every year. The nonstructural protein NSP4 acts as a rotavirus enterotoxin, inducing secretory diarrhea without any structural organ damage. Electrolyte transport was assessed in the colonic epithelium from pups and adult mice using Ussing chamber recordings. Western blots and immunocytochemistry was performed in intestinal tissues from wild-type and TMEM16A knockout mice. Ion channel currents were recorded using patch clamp techniques. We show that the synthetic NSP4114–135 peptide uses multiple pro-secretory pathways to induce diarrhea, by activating the recently identified Ca2+-activated Cl channel TMEM16A, and by inhibiting Na+ absorption by the epithelial Na+ channel ENaC and the Na+/glucose cotransporter SGLT1. Activation of secretion and inhibition of Na+ absorption by NSP4114–135, respectively, could be potently suppressed by wheat germ agglutinin which probably competes with NSP4114–135 for binding to an unknown glycolipid receptor. The present paper gives a clue as to mechanisms of rotavirus-induced diarrhea and suggests wheat germ agglutinin as a simple and effective therapy.

Keywords

RotavirusNSP4Ca2+-activated Cl channelsTMEM16AENaCEpithelial Na+ channelsSGLT1Colonic epitheliumDiarrhea

Supplementary material

424_2011_947_MOESM1_ESM.doc (51 kb)
ESM 1(DOC 51.0 kb)

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Jiraporn Ousingsawat
    • 1
  • Myriam Mirza
    • 1
  • Yuemin Tian
    • 1
  • Eleni Roussa
    • 3
  • Rainer Schreiber
    • 1
  • David I. Cook
    • 2
  • Karl Kunzelmann
    • 1
  1. 1.Institut für PhysiologieUniversität RegensburgRegensburgGermany
  2. 2.Department of PhysiologyUniversity of SydneySydneyAustralia
  3. 3.Department of AnatomyUniversity of FreiburgFreiburgGermany