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Examining BCL-2 Family Function with Large Unilamellar Vesicles
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Bcl-x short-isoform is essential for maintaining homeostasis of multiple tissues

Mariko Aoyagi Keller1, Chun-Yang Huang1,2,3, Andreas Ivessa1

  • 1Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07103, USA.

Iscience
|April 10, 2023
PubMed

Insights

Genetic inhibition of BCL-2-like protein 1 short isoform (Bcl-xS) in mice revealed its essential role in maintaining organ homeostasis. Loss of Bcl-xS leads to cardiac and spleen abnormalities, highlighting its importance beyond development.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Physiology

Background:

  • BCL-2-like protein 1 (BCL2L1) regulates cell survival and death.
  • Altered BCL2L1 splicing variants are linked to various pathologies.
  • Isoform-specific functions of BCL2L1, particularly Bcl-x short isoform (Bcl-xS), are not well understood.

Purpose of the Study:

  • To investigate the in vivo functional impact of genetically inhibiting the Bcl-xS isoform of BCL2L1.
  • To determine the role of Bcl-xS in maintaining organ homeostasis and preventing disease.

Main Methods:

  • Generation and analysis of Bcl-xS knockout (KO) mice.
  • Assessment of cardiac function, histology, and apoptosis.
  • Evaluation of signaling pathways (Akt/mTOR, JNK/cJun) and protein expression (Bax) in affected organs.

Main Results:

  • Bcl-xS is widely expressed, with high levels in mouse spleen and blood.
  • Bcl-xS KO mice exhibit normal development but develop cardiac hypertrophy, contractile dysfunction, and splenomegaly by 6 months.
  • Cardiac fibrosis increased in KO mice, with no change in apoptosis, while JNK/cJun signaling and Bax expression were altered in the spleen.

Conclusions:

  • Bcl-xS is dispensable for embryonic and early development.
  • Bcl-xS is crucial for maintaining the homeostasis of multiple organs, including the heart and spleen, in adult mice.
  • Dysregulation of Bcl-xS contributes to organ pathologies through specific signaling pathways.
Keywords:
Cardiovascular medicineCell biologyDevelopmental biology

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