Multi drug resistance-1 (MDR1) expression in response to chronic diazinon exposure: An in vitro study on Caco-2 cells

Peiman Habibollahi, Mohammad Hossein Ghahremani, Ebrahim Azizi, Seyed Nasser Ostad

Research output: Contribution to journalArticle

6 Scopus citations


To evaluate the effect of chronic exposure to diazinon in the gastrointestinal tract, Caco-2 cells were made resistant by growing in low concentrations of diazinon (0.02 μM) that was gradually increased to 20 μM within 4.5 months. Resistant cells showed significant higher growth in the presence of 15, 45 and 135 μM of diazinon (96.08, 81.80 and 65.16% of control) compared to parent cells (79.71, 71.76 and 29.50% of control, respectively; p < 0.05). P-glycoprotein (P-gp) expression increased significantly in resistant cells (P-gp to beta-actin ratio 0.586 for parent and 1.255 for resistant cells, respectively; p < 0.05) without any alteration in MDR-1 mRNA level (p > 0.05).

Original languageEnglish (US)
Pages (from-to)105-109
Number of pages5
JournalBulletin of Environmental Contamination and Toxicology
Issue number1
StatePublished - Jan 1 2011



  • Caco-2
  • Diazinon
  • Multi drug resistance 1
  • P-glycoprotein

ASJC Scopus subject areas

  • Toxicology
  • Pollution
  • Health, Toxicology and Mutagenesis

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