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The influence of conjugated linoleic acid on the expression of peroxisome proliferator-activated receptor-γ and selected apoptotic genes in non-small cell lung cancer

Authors
  • Słowikowski, Bartosz Kazimierz1
  • Drzewiecka, Hanna1
  • Malesza, Michał1
  • Mądry, Ida1
  • Sterzyńska, Karolina1
  • Jagodziński, Paweł Piotr1
  • 1 Poznan University of Medical Sciences,
Type
Published Article
Journal
Molecular and Cellular Biochemistry
Publisher
Springer-Verlag
Publication Date
Jan 29, 2020
Volume
466
Issue
1
Pages
65–82
Identifiers
DOI: 10.1007/s11010-020-03689-8
PMID: 31993929
PMCID: PMC7028827
Source
PubMed Central
Keywords
License
Unknown

Abstract

In recent years, peroxisome proliferator-activated receptor-γ (PPARγ) has been intensively studied. Because its activation is often associated with changes in the expression level of various apoptotic genes, many studies have emphasized the role of PPARγ as an important anticancer agent. However, in different types of cancer, different genes are influenced by PPARγ action. Previous studies showed that conjugated linoleic acid (CLA) was able to induce apoptosis, upregulate PPARG gene expression and activate PPARγ protein in certain human cancer cell lines. Moreover, some PPARγ agonists inhibited the growth of human lung cancer cells through the induction of apoptosis. Nevertheless, the impact of CLA on PPARγ mRNA and protein levels in non-small cell lung cancer (NSCLC) cell lines has not been investigated thus far. Therefore, in our study, we analysed the influence of the c9,t11 linoleic acid isomer on the expression of PPARG and other genes involved in the apoptotic response ( BCL-2, BAX, and CDKN1A ) in two NSCLC cell lines of different histological origin (A549 and Calu-1) and in normal human bronchial epithelial Beas-2B cells. Cells were treated with several doses of c9,t11 CLA, followed by RNA and protein isolation, cDNA synthesis, real-time quantitative PCR (RT-qPCR) and Western blot analysis. We showed that the investigated CLA isomer was able to enhance the expression of PPAR γ in the examined cell lines and alter the mRNA and protein levels of genes involved in apoptosis. Fluorescent staining and MMT assay revealed the antiproliferative potential of CLA as well as its ability to activate pathways that lead to cell death.

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