Volume-activated Cl- secretion and transepithelial vinblastine secretion mediated by P-glycoprotein are not correlated in cultured human T84 intestinal epithelial layers

G T McEwan, J Hunter, B H Hirst, N L Simmons

Research output: Contribution to journalArticle

31 Citations (Scopus)


The relationship between the P-glycoprotein-mediated vinblastine secretion and cell-swelling activated Cl- secretion (conductance) in intact epithelial layers of human colonic adenocarcinoma T84 cells has been investigated. Whereas vinblastine secretion is effectively inhibited by 100 microM 1,9-dideoxy-forskolin, volume-stimulated Cl- secretion is unaffected. In contrast, 100 microM 4,4'-diisothiocyanostilbene-2,2'-disulphonic acid (DIDS) inhibited the volume-stimulated Cl- secretion, but was without effect upon transepithelial vinblastine secretion. In addition, it was noted that some epithelial layers failed to express a volume-stimulated Cl- secretion but maintained a normal level of secretory vinblastine flux.
Original languageEnglish
Pages (from-to)233-6
Number of pages4
JournalFEBS Letters
Issue number2-3
Publication statusPublished - 15 Jun 1992



  • 4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid
  • 4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid
  • Biological Transport
  • Chloride Channels
  • Chlorides
  • Colforsin
  • Humans
  • Intestinal Mucosa
  • Membrane Glycoproteins
  • Membrane Proteins
  • P-Glycoprotein
  • Tumor Cells, Cultured
  • Vinblastine

Cite this