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Caveolin-1 regulates cell apoptosis and invasion ability in paclitaxel-induced multidrug-resistant A549 lung cancer

Fei Han1, Long Zhang2, Yongxin Zhou3

  • 1Department of Pathology, Shanghai Tongji Hospital Affiliated to Shanghai Tongji University Shanghai 200065, China ; Department of Pathology, Shanghai Chest Hospital Affiliated to Shanghai Jiao Tong University Shanghai 200030, China.

International Journal of Clinical and Experimental Pathology
|October 15, 2015
PubMed

Insights

Knocking down caveolin-1 (Cav1) in paclitaxel-resistant lung cancer cells significantly inhibits proliferation and induces apoptosis. This mechanism involves regulating cyclin D1 and the Bcl-2/Bax pathway, impacting cell migration and invasion.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Paclitaxel resistance is a major challenge in lung cancer treatment.
  • Caveolin-1 (Cav1) is implicated in cancer progression and drug resistance.
  • Understanding Cav1's role in paclitaxel-resistant lung cancer is crucial for developing new therapies.

Purpose of the Study:

  • To investigate the effect of caveolin-1 (Cav1) knockdown on paclitaxel-resistant lung cancer cells (A549/Taxol).
  • To elucidate the underlying molecular mechanisms of Cav1's influence on drug resistance, proliferation, apoptosis, migration, and invasion.

Main Methods:

  • Stable transfection of A549/Taxol cells with Cav1 shRNA lentiviral vector.
  • Assessment of Cav1 knockdown efficiency using real-time PCR and Western blotting.
  • Evaluation of cell proliferation (MTT assay), cell cycle and apoptosis (flow cytometry), and cell migration/invasion (Transwell assay).
  • Analysis of related signaling molecules (e.g., cyclin D1, Bcl-2, Bax, AKT, MMPs) via Western blotting.

Main Results:

  • Successful generation of a stable A549/Taxol cell line with reduced Cav1 expression.
  • Cav1 knockdown significantly inhibited cell proliferation and induced G0/G1 cell cycle arrest.
  • Cav1 knockdown promoted significant apoptosis, linked to the Bcl-2/Bax-mediated mitochondrial pathway.
  • Reduced cyclin D1 expression was observed following Cav1 knockdown.
  • Inhibition of cell migration and invasion was observed, potentially via AKT pathway inhibition and decreased MMP2, MMP7, and MMP9 expression.

Conclusions:

  • Caveolin-1 (Cav1) knockdown is a promising strategy to overcome paclitaxel resistance in lung cancer.
  • Cav1 plays a critical role in regulating proliferation, apoptosis, and metastasis in paclitaxel-resistant lung cancer cells.
  • Targeting Cav1 may offer a therapeutic approach to enhance the efficacy of paclitaxel treatment for lung cancer.
Keywords:
A549/TaxolCaveolin-1apoptosisinvasionmultidrug-resistant

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