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Updated: May 26, 2026

Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death
09:18

Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death

Published on: December 27, 2016

A novel dual signaling axis for NSP 5a3a induced apoptosis in head and neck carcinoma

Luca D'Agostino1, Antonio Giordano

  • 1Sbarro Institute for Cancer Research and Molecular Medicine and Department of Biology, College of Science and Technology Temple University, 1900 North 12th street room 431, Philadelphia PA 19122, USA. lucadag@temple.edu

Oncotarget
|December 16, 2011
PubMed

Insights

Novel protein NSP 5a3a induces cancer cell death via a unique p73-dependent pathway. This mechanism bypasses traditional cell death pathways, offering new therapeutic targets for Head and Neck Carcinoma.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cellular Biology

Background:

  • NSP 5a3a is a novel structural protein over-expressed in vitro in cancer cell lines (Hela, Saos-2, MCF-7) but not normal tissues (except testis).
  • NSP 5a3a interacts with nucleocytoplasmic proteins B23 and hnRNP-L, involved in cell division, apoptosis, and RNA metabolism.
  • Previous studies indicated NSP 5a3a induces p73-dependent apoptosis in Head and Neck Carcinoma cell lines.

Purpose of the Study:

  • To elucidate the novel signaling mechanism by which NSP 5a3a induces apoptosis in Head and Neck cell line HN30.
  • To investigate the specific molecular players and pathways involved in NSP 5a3a-mediated apoptosis.

Main Methods:

  • Overexpression of NSP 5a3a in Head and Neck cell line HN30.
  • Analysis of the p73-DAXX and TRAF2-TRADD signaling axes.
  • Investigation of canonical caspase-independent apoptosis pathways.

Main Results:

  • NSP 5a3a induces apoptosis in HN30 cells through a dual axis signaling point involving p73-DAXX and TRAF2-TRADD.
  • This apoptotic mechanism is independent of canonical caspases in both the intrinsic mitochondrial and extrinsic death receptor pathways.
  • The findings reveal a novel non-canonical apoptotic pathway activated by NSP 5a3a.

Conclusions:

  • NSP 5a3a triggers cancer cell apoptosis via a novel dual signaling axis (p73-DAXX and TRAF2-TRADD).
  • This pathway represents a non-canonical mechanism of apoptosis, distinct from caspase-dependent pathways.
  • NSP 5a3a presents a potential therapeutic target for Head and Neck Carcinoma, exploiting a unique cell death mechanism.

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