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Evaluation of the expression of P-glycoprotein in propoxur-resistant Caco-2 cells

Shabnam Yazdian1, Najmeh Fahham2, Mohammad Hossein Ghahremani3

  • 1Department of Toxicology & Pharmacology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran. yazdian.shabnam@gmail.com.

Acta Medica Iranica
|November 5, 2014
PubMed
Abstract

Insights

Propoxur pesticide resistance in Caco-2 cells was studied. Unexpectedly, P-glycoprotein expression decreased in resistant cells, suggesting resistance is not directly linked to this protein.

Area of Science:

  • Toxicology
  • Cell Biology
  • Biochemistry

Background:

  • Propoxur, a common N-methyl carbamate pesticide, raises human health concerns due to widespread agricultural and non-agricultural use.
  • Understanding pesticide resistance mechanisms is crucial for assessing health risks and developing mitigation strategies.

Purpose of the Study:

  • To investigate the cellular mechanisms underlying Caco-2 cell resistance to the pesticide propoxur.
  • To determine the role of P-glycoprotein expression in propoxur resistance.

Main Methods:

  • Caco-2 cells were induced for resistance to propoxur.
  • Cell viability was assessed using MTT assay.
  • Cell membrane integrity was measured by LDH assay.
  • P-glycoprotein expression levels were quantified via Western blot analysis.

Main Results:

  • Caco-2 cells successfully developed resistance to propoxur, confirmed by MTT assay.
  • Contrary to initial hypotheses, P-glycoprotein expression was found to be lower in propoxur-resistant cells compared to parent cells.
  • LDH assay indicated no significant changes in cell membrane integrity.

Conclusions:

  • Propoxur resistance in Caco-2 cells may not be directly mediated by P-glycoprotein.
  • The observed decrease in P-glycoprotein expression suggests alternative or complex resistance pathways may be involved.

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