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Determination of the Relative Potency of an Anti-TNF Monoclonal Antibody (mAb) by Neutralizing TNF Using an In Vitro Bioanalytical Method
16:07

Determination of the Relative Potency of an Anti-TNF Monoclonal Antibody (mAb) by Neutralizing TNF Using an In Vitro Bioanalytical Method

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Fas antigen and p55 TNF receptor signal apoptosis through distinct pathways

G H Wong1, D V Goeddel

  • 1Department of Cardiovascular Research, Genentech, Inc., South San Francisco, CA 94080.

Journal of Immunology (Baltimore, Md. : 1950)
|February 15, 1994
PubMed

Insights

Fas Ag and p55 TNF receptor (TNF-R1) trigger apoptosis through distinct pathways. Combining their activation synergistically enhances cancer cell death, suggesting therapeutic potential.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cancer Research

Background:

  • Fas Ag and p55 TNF receptor (TNF-R1) are homologous cell surface receptors that initiate apoptosis.
  • Both receptors are frequently co-expressed on tumor cells, yet exhibit differential sensitivity to activation.
  • Selective inhibition of TNF-R1-mediated cytotoxicity is achievable without impacting Fas-mediated apoptosis.

Purpose of the Study:

  • To investigate the distinct signaling pathways activated by Fas Ag and TNF-R1.
  • To determine the effects of combined Fas and TNF-R1 activation on apoptosis.
  • To explore the therapeutic implications of co-activating these receptors.

Main Methods:

  • Utilized tumor cell lines expressing both Fas Ag and TNF-R1.
  • Applied specific agonists to activate Fas and TNF-R1 individually and in combination.
  • Assessed apoptosis induction and signaling pathway activation.

Main Results:

  • Fas Ag and TNF-R1 activate distinct biochemical pathways leading to apoptosis.
  • Co-activation of Fas and TNF-R1 results in synergistic apoptosis signaling.
  • Differential sensitivity to receptor activation suggests distinct downstream effects.

Conclusions:

  • Fas and TNF-R1 engage separate molecular mechanisms to induce cell death.
  • Synergistic apoptosis via combined receptor activation presents a promising strategy for cancer therapy.
  • Targeting both Fas and TNF-R1 pathways may overcome resistance and enhance treatment efficacy.

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