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Carboxyl-terminal modulator protein induces apoptosis by regulating mitochondrial function in lung cancer cells

Soon-Kyung Hwang1, Arash Minai-Tehrani, Kyeong-Nam Yu

  • 1Laboratory of Toxicology, College of Veterinary Medicine Seoul National University, Seoul 151-742, Republic of Korea.

International Journal of Oncology
|December 28, 2011
PubMed

Insights

Carboxyl-terminal modulator protein (CTMP) triggers cancer cell death by disrupting mitochondria. This study reveals CTMP

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Serine/threonine protein kinase B (PKB/Akt) regulates cell survival and growth.
  • Carboxyl-terminal modulator protein (CTMP) is a novel Akt binding partner that inhibits Akt activation.
  • CTMP exhibits tumor suppressor-like functions, inhibiting tumor progression by promoting apoptosis.

Purpose of the Study:

  • To investigate the role of CTMP in mitochondrial-mediated apoptosis in human lung carcinoma cells.
  • To elucidate the precise mechanism by which CTMP induces apoptosis.

Main Methods:

  • Analysis of mitochondrial morphology in lung carcinoma cells.
  • Measurement of cytochrome c release.
  • Assessment of OPA1 expression and heat-shock protein 27.
  • Investigation of cytochrome c interaction with Apaf-1.

Main Results:

  • CTMP altered mitochondrial morphology and induced cytochrome c release by inhibiting OPA1 expression.
  • CTMP promoted mitochondrial-mediated apoptosis by inhibiting heat-shock protein 27.
  • CTMP prevented the interaction between cytochrome c and Apaf-1.

Conclusions:

  • CTMP plays a critical role in inducing mitochondrial-mediated apoptosis in lung cancer cells.
  • CTMP's mechanism involves altering mitochondrial function and disrupting key apoptotic pathways.

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