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Related F-box proteins control cell death in Caenorhabditis elegans and human lymphoma

Michael Chiorazzi1, Lixin Rui, Yandan Yang

  • 1Laboratory of Developmental Genetics, The Rockefeller University, New York, NY 10065, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 23, 2013
PubMed

Insights

Researchers discovered a new cell death pathway in C. elegans involving DRE-1, which inactivates CED-9 to promote apoptosis. The related human protein FBXO10 also regulates cell death and is implicated in lymphomas.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Apoptotic cell death is crucial in metazoans and its dysregulation is linked to cancer.
  • In C. elegans, apoptosis is mediated by caspase CED-3 activation, triggered by EGL-1 binding to CED-9.
  • Understanding alternative cell death pathways is vital for cancer research.

Purpose of the Study:

  • To identify novel mechanisms regulating apoptosis in vivo.
  • To investigate the role of F-box protein DRE-1 in programmed cell death.
  • To explore the conserved function of DRE-1 and its human homolog, FBXO10, in cell death regulation.

Main Methods:

  • Utilized Caenorhabditis elegans as a model organism.
  • Investigated the interaction between DRE-1, CED-9, and CED-3.
  • Analyzed the function of human FBXO10 in cell death and its association with diffuse large B-cell lymphomas.

Main Results:

  • Identified DRE-1 as a key regulator of apoptosis acting in parallel to EGL-1.
  • Demonstrated that DRE-1 requires CED-9 for its apoptotic activity and directly binds to CED-9.
  • Showed that human FBXO10 binds BCL2, promotes its degradation, and initiates cell death.
  • Found inactivating mutations or low expression of FBXO10 in some diffuse large B-cell lymphomas.

Conclusions:

  • DRE-1 represents a significant alternative pathway for caspase activation and apoptosis induction in C. elegans.
  • FBXO10, the human ortholog of DRE-1, is a conserved regulator of apoptosis.
  • Dysregulation of the DRE-1/FBXO10 pathway may contribute to the development of certain cancers, such as diffuse large B-cell lymphoma.

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