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Developmental checkpoints guarded by regulated necrosis

Christopher P Dillon1, Bart Tummers1, Katherine Baran1

  • 1Department of Immunology, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN, 38105, USA.

Cellular and Molecular Life Sciences : CMLS
|April 9, 2016
PubMed

Insights

Programmed necrotic cell death, or necroptosis, is crucial for embryonic development, with its suppression essential at key checkpoints. Genetic studies reveal the molecular pathways regulating this novel cell death mechanism.

Area of Science:

  • Developmental Biology
  • Cell Death Pathways
  • Molecular Genetics

Background:

  • Embryonic development relies on regulated differentiation and programmed cell death.
  • Necroptosis (RIPK-dependent programmed cell death) plays a critical role in development.
  • Genetic models have been instrumental in characterizing necroptosis.

Purpose of the Study:

  • To review the role of necroptosis in embryonic development.
  • To summarize genetic evidence detailing necroptosis regulation.
  • To highlight the molecular mechanisms of this cell death pathway.

Main Methods:

  • Analysis of genetically engineered mouse models.
  • Investigation of embryonic lethality at specific developmental checkpoints (E10.5, E16.5, P1).
  • Examination of knockout models for apoptosis pathway components (caspase-8, FADD, cFLIP) and necroptosis regulators (RIPK3, RIPK1, TNFR1).

Main Results:

  • Suppression of necroptosis is vital for murine development, with critical checkpoints at E10.5, E16.5, and P1.
  • Absence of apoptosis regulators (caspase-8, FADD, cFLIP) led to embryonic lethality at E10.5, suggesting their role in inhibiting necroptosis.
  • Elimination of TNFR1 in these knockouts delayed lethality to E16.5, emphasizing TNF-mediated necroptosis in vivo.
  • RIPK1 exhibits a dual role in necroptosis induction and inhibition.

Conclusions:

  • Necroptosis is a critical, genetically regulated process in embryonic development.
  • Distinct molecular players and signaling pathways govern necroptosis at different developmental stages.
  • Understanding necroptosis mechanisms provides insights into developmental biology and cell death regulation.
Keywords:
Caspase-8DevelopmentNecroptosisRIPK3

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