The hypertonic environment differentially regulates wild-type CFTR and TNR-CFTR chloride channels

Roberta Soares, Jie Cheng, Kristina Krasnov, Liudmila Cebotaru, Garry R. Cutting, Jackson Souza-Menezes, Marcelo M. Morales, William B. Guggino

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This study tested the hypotheses that the hypertonic environment of the renal medulla regulates the expression of cystic fibrosis transmembrane conductance regulator protein (CFTR) and its natural splice variant, TNR-CFTR. To accomplish this, Madin-Darby canine kidney (MDCK) stable cell lines expressing TNR-CFTR or CFTR were used. The cells were treated with hypertonic medium made with either NaCl or urea or sucrose (480 mOsm/kg or 560 mOsm/kg) to mimic the tonicity of the renal medulla environment. Western blot data showed that CFTR and TNR-CFTR total cell protein is increased by hypertonic medium, but using the surface biotinylation technique, only CFTR was found to be increased in cell plasma membrane. Confocal microscopy showed TNR-CFTR localization primarily at the endoplasmic reticulum and plasma membrane. In conclusion, CFTR and TNR-CFTR have different patterns of distribution in MDCK cells and they are modulated by a hypertonic environment, suggesting their physiological importance in renal medulla.

Original languageEnglish (US)
Pages (from-to)577-586
Number of pages10
JournalCellular Physiology and Biochemistry
Volume26
Issue number4-5
DOIs
StatePublished - Nov 17 2010
Externally publishedYes

Fingerprint

Cystic Fibrosis Transmembrane Conductance Regulator
Chloride Channels
Proteins
Madin Darby Canine Kidney Cells
Cell Membrane
Kidney
Biotinylation
Confocal Microscopy
Endoplasmic Reticulum
Sucrose
Urea
Western Blotting

Keywords

  • CFTR
  • Hypertonic environment
  • MDCK cells
  • Plasma membrane
  • Sodium chloride
  • Sucrose
  • TNR-CFTR
  • Urea

ASJC Scopus subject areas

  • Physiology

Cite this

Soares, R., Cheng, J., Krasnov, K., Cebotaru, L., Cutting, G. R., Souza-Menezes, J., ... Guggino, W. B. (2010). The hypertonic environment differentially regulates wild-type CFTR and TNR-CFTR chloride channels. Cellular Physiology and Biochemistry, 26(4-5), 577-586. https://doi.org/10.1159/000322325

The hypertonic environment differentially regulates wild-type CFTR and TNR-CFTR chloride channels. / Soares, Roberta; Cheng, Jie; Krasnov, Kristina; Cebotaru, Liudmila; Cutting, Garry R.; Souza-Menezes, Jackson; Morales, Marcelo M.; Guggino, William B.

In: Cellular Physiology and Biochemistry, Vol. 26, No. 4-5, 17.11.2010, p. 577-586.

Research output: Contribution to journalArticle

Soares, R, Cheng, J, Krasnov, K, Cebotaru, L, Cutting, GR, Souza-Menezes, J, Morales, MM & Guggino, WB 2010, 'The hypertonic environment differentially regulates wild-type CFTR and TNR-CFTR chloride channels', Cellular Physiology and Biochemistry, vol. 26, no. 4-5, pp. 577-586. https://doi.org/10.1159/000322325
Soares, Roberta ; Cheng, Jie ; Krasnov, Kristina ; Cebotaru, Liudmila ; Cutting, Garry R. ; Souza-Menezes, Jackson ; Morales, Marcelo M. ; Guggino, William B. / The hypertonic environment differentially regulates wild-type CFTR and TNR-CFTR chloride channels. In: Cellular Physiology and Biochemistry. 2010 ; Vol. 26, No. 4-5. pp. 577-586.
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