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CMTM5-v1 induces apoptosis in cervical carcinoma cells

Luning Shao1, Xiaohuan Guo, Markus Plate

  • 1Peking University Center for Human Disease Genomics, Department of Immunology, Health Science Center, Peking University, 38 Xueyuan Road, Beijing 100191, China.

Biochemical and Biophysical Research Communications
|January 7, 2009
PubMed

Insights

CKLF-like MARVEL transmembrane domain-containing member 5 (CMTM5) inhibits cervical carcinoma (CC) growth. Overexpression of CMTM5-v1 induces apoptosis in CC cells, primarily through a caspase-dependent pathway, verifying its tumor suppressor role.

Area of Science:

  • Oncology
  • Molecular Biology

Background:

  • CKLF-like MARVEL transmembrane domain-containing member 5 (CMTM5) demonstrates tumor inhibition, frequently epigenetically silenced in cancers like cervical carcinoma (CC).
  • The primary RNA splicing variant, CMTM5-v1, is investigated for its functional role in CC cell lines.

Purpose of the Study:

  • To investigate the function of CMTM5-v1 in HeLa and SiHa cervical carcinoma cells.
  • To elucidate the mechanism by which CMTM5-v1 inhibits CC cell growth.

Main Methods:

  • Overexpression of CMTM5-v1 in HeLa and SiHa cells.
  • Assessment of apoptosis induction and its pathways.
  • Measurement of mitochondrial transmembrane potential, cytochrome c release, caspase-3 activation, and PARP cleavage.

Main Results:

  • CMTM5-v1 overexpression induced apoptosis in both HeLa and SiHa cells, with a more pronounced effect in SiHa cells.
  • In SiHa cells, CMTM5-v1 restoration led to mitochondrial dysfunction, cytochrome c release, and caspase-3 activation.
  • Caspase inhibition significantly reduced CMTM5-v1-induced apoptosis, indicating a caspase-dependent mechanism.

Conclusions:

  • CMTM5-v1 inhibits the growth of cervical carcinoma cell lines.
  • CMTM5-v1 induces apoptosis in CC cells via a caspase-dependent pathway involving mitochondrial disruption.

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