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Rejuvenating Bi(d)ology.

S S Zinkel1, X M Yin2, A Gross3

  • 1Departments of Medicine, Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA.

Oncogene
|October 17, 2012
PubMed
Summary
This summary is machine-generated.

The BH3-only Bid protein acts as a cellular stress sentinel. It triggers apoptosis and protects hematopoietic stem cells from DNA damage via the ATM/ATR-Bid pathway.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Hematology

Background:

  • The BH3-only Bid protein is a key regulator of cellular stress responses.
  • Bid's role has expanded from triggering apoptosis via caspase cleavage to sensing various cellular injuries.
  • Bid also functions in its full-length form to protect hematopoietic stem cells.

Purpose of the Study:

  • To review the multifaceted roles of the Bid protein in cellular stress.
  • To highlight Bid's involvement in apoptosis and DNA damage response.
  • To discuss the ATM/ATR-Bid pathway's significance in hematopoietic stem cell regulation.

Main Methods:

  • Literature review of Bid protein functions.
  • Analysis of Bid's involvement in apoptotic pathways.
  • Examination of the ATM/ATR-Bid signaling in stem cell biology.

Main Results:

  • Bid triggers mitochondrial apoptosis through multiple protease activations and interaction with mitochondrial carrier homolog 2.
  • Bid's mechanisms include cytochrome c and Smac release, mitochondrial alterations, ROS generation, and pore opening.
  • The full-length Bid protein, regulated by ATM/ATR kinases, is crucial for hematopoietic stem cell quiescence and survival.

Conclusions:

  • Bid is a versatile sentinel protein involved in both cell death and survival pathways.
  • The ATM/ATR-Bid pathway is essential for maintaining hematopoietic stem cell integrity under stress.
  • Further research into Bid's functions can offer insights into liver and hematopoietic system disorders.