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Autocrine motility factor signaling induces tumor apoptotic resistance by regulations Apaf-1 and Caspase-9 apoptosome

Arayo Haga1, Tatsuyoshi Funasaka, Yasufumi Niinaka

  • 1Department of Hygienics, Gifu Pharmaceutical University, Gifu, Japan. arayo@gifu-pu.ac.jp

International Journal of Cancer
|October 21, 2003
PubMed

Insights

Autocrine motility factor (AMF) promotes tumor cell survival by inhibiting apoptosis, a key mechanism in cancer drug resistance. Targeting AMF signaling may restore cancer cell death and improve chemotherapy efficacy.

Area of Science:

  • Cell Biology
  • Molecular Oncology
  • Immunology

Background:

  • Autocrine motility factor (AMF) is a cytokine linked to tumor malignancy and rheumatoid arthritis.
  • AMF signaling is implicated in tumor cell locomotion, metastasis, and resistance to apoptosis.
  • High AMF secretion correlates with resistance to drug-induced apoptosis in human fibrosarcoma cells.

Purpose of the Study:

  • To investigate the role of AMF in anti-apoptotic activity and its impact on cancer chemotherapy.
  • To explore the molecular mechanisms by which AMF confers resistance to apoptosis.
  • To evaluate the therapeutic potential of targeting AMF signaling against cancer.

Main Methods:

  • Utilized human fibrosarcoma HT-1080 cell lines with high AMF secretion.
  • Analyzed gene expression of apoptotic protease activating factor-1 (Apaf-1) and Caspase-9.
  • Employed cellular signaling inhibitors (PKC, PI3K, MAPK) and antibodies against AMF.
  • Tested efficacy in murine ascites Ehrlich tumor models.

Main Results:

  • AMF signaling induced anti-apoptotic activity in HT-1080 cells, which lacked Apaf-1 and Caspase-9 expression.
  • Inhibitors restored Apaf-1 and Caspase-9 gene expression and favored apoptosis in response to anti-cancer drugs.
  • Antibodies against AMF induced apoptosis in vitro and enhanced anti-cancer drug efficacy in vivo.
  • AMF appears to regulate Apaf-1 and Caspase-9 gene expression, indirectly affecting apoptosome formation.

Conclusions:

  • AMF plays a critical role in conferring apoptotic resistance to tumor cells, enabling survival under stress and chemotherapy.
  • Targeting AMF signaling pathways presents a novel therapeutic strategy to overcome cancer drug resistance.
  • Understanding AMF-mediated apoptosis evasion is crucial for developing more effective cancer treatments.

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