Related Experiment Video

Updated: May 11, 2026

A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins
16:10

A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins

Published on: March 22, 2012

The TNF receptor 1: a split personality complex

Bryan C Barnhart1, Marcus E Peter

  • 1The Ben May Institute for Cancer Research, University of Chicago, 924 East 57th Street, Chicago, IL 60637, USA.

Cell
|July 31, 2003
PubMed

Insights

Tumor necrosis factor receptor 1 (TNFR1) signaling involves two complexes that control apoptosis. The first complex can activate survival signals, acting as a checkpoint to regulate cell death.

Area of Science:

  • Cellular biology
  • Molecular signaling
  • Apoptosis research

Background:

  • Tumor necrosis factor receptor 1 (TNFR1) is a key member of the death receptor superfamily.
  • TNFR1 signaling pathways are known to regulate both cell survival and programmed cell death (apoptosis).

Purpose of the Study:

  • To elucidate the sequential molecular mechanisms underlying TNFR1-mediated apoptotic signaling.
  • To investigate the role of distinct protein complex formations in controlling cell fate decisions.

Main Methods:

  • The study involved analyzing the temporal formation of protein complexes downstream of TNFR1 activation.
  • Investigated the functional interplay between early and late signaling complexes.

Main Results:

  • TNFR1 apoptotic signaling occurs through the sequential assembly of two distinct molecular complexes.
  • The initial complex formation is capable of activating pro-survival pathways.
  • The activity of the second complex is modulated by the first complex, establishing a regulatory checkpoint.

Conclusions:

  • TNFR1 signaling integrates survival and death pathways through a sequential complex formation mechanism.
  • This sequential complex formation acts as a critical checkpoint, ensuring regulated execution of apoptosis.

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