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Maspin suppresses survival of lung cancer cells through modulation of Akt pathway

Eunsook Nam1, Chaehwa Park

  • 1Samsung Biomedical Research Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.

Cancer Research and Treatment
|April 7, 2010
PubMed
Abstract

Insights

Maspin suppresses lung cancer cell survival to chemotherapy by inhibiting Akt phosphorylation. Maspin gene therapy effectively reduced tumor growth in animal models, offering a potential therapeutic strategy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Therapeutics

Background:

  • Maspin is a tumor suppressor protein involved in cancer cell death and metastasis inhibition.
  • Understanding maspin's role in chemoresistance is crucial for developing effective lung cancer treatments.

Purpose of the Study:

  • To investigate how maspin influences human lung cancer cell resistance to chemotherapy.
  • To evaluate the therapeutic potential of maspin gene therapy in a preclinical animal model.

Main Methods:

  • Lung cancer cell lines (NCI-H157, A549) were transfected with maspin or control vectors/siRNA.
  • Gene and protein expression (RT-PCR, Western blot, microarray) and Akt phosphorylation were analyzed.
  • Maspin gene therapy was administered via intratumoral injection in nude mice xenografts.

Main Results:

  • Maspin reduced NCI-H157 cell survival to doxorubicin and etoposide, correlating with decreased Akt phosphorylation.
  • Maspin knockdown in A549 cells increased Akt phosphorylation.
  • Microarray analysis revealed maspin's association with PTEN and IGF2R gene expression.
  • Intratumoral maspin gene transfer significantly inhibited tumor growth in vivo.

Conclusions:

  • Lung cancer cells lacking maspin may develop resistance to certain chemotherapies, partly via sustained Akt phosphorylation.
  • Maspin plays a critical role in modulating chemoresistance pathways in lung cancer.
  • Maspin gene therapy demonstrates efficacy in reducing tumor growth, suggesting its therapeutic value.
Keywords:
AktMicroarray analysisSERPIN-B5Survival

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