Distinction between differentiation, cell cycle, and apoptosis signals in PC12 cells by the nerve growth factor mutant Δ9/13, which is selective for the p75 neurotrophin receptor

Mark P. Mattson, Wolfram Klapper

Research output: Contribution to journalArticlepeer-review

Abstract

The common neurotrophin receptor p75NTR (low affinity nerve growth factor receptor) participates in the high-affinity binding with the TrkA nerve growth factor (NGF) receptor, may mediate apoptosis, and may signal independently in a cell-specific manner. The potential of p75NTR to signal independently of TrkA was investigated with an NGF mutant protein (NGFΔ9/13) that binds poorly to TrkA (Woo et al. [1995] J. Biol. Chem. 270: 6278-6285). The NGFΔ9/13 mutant does not activate TrkA autophosphorylation and fails to stimulate the normal NGF-induced growth arrest, demonstrating that TrkA activation is required to arrest PC12 cells at the NGF-activated G1/S cell cycle checkpoint. However, apoptosis is successfully blocked and cell survival is promoted by the NGFΔ9/13 mutant in naive PC12 cells after serum withdrawal, suggesting that p75NTR can signal for survival autonomously of TrkA. Annexin V binding, an indication of apoptotic plasma membrane disruption, is inhibited by both NGF and the NGFΔ9/13 mutant after serum deprivation. Both NGF and the NGFΔ9/13 mutant inhibit the rapid apoptotic internucleosomal DNA cleavage of PC12 cells upon serum deprivation. Furthermore, the level of caspase3-like activity that is rapidly activated by serum withdrawal from PC12 cells is reduced by both the NGFΔ9/13 protein and NGF. Finally, upon serum withdrawal, both NGF and the NGFΔ9/13 mutant activate nuclear translocation of the transcriptional factor NF-ΚB (nuclear factor ΚB), a process involved in cell survival. These results are consistent with p75NTR inhibition of caspase-mediated apoptosis in PC12 cells. The different physiologic responses elicited by NGFΔ9/13 indicate the potential for individual signaling by the two NGF receptors and also demonstrate the utility of NGF mutants for receptor-selective signal transduction.

Original languageEnglish (US)
Pages (from-to)10-19
Number of pages10
JournalJournal of Neuroscience Research
Volume63
Issue number1
DOIs
StatePublished - Jan 1 2001

Keywords

  • Cell survival
  • Growth arrest
  • Mitogenesis
  • Neuronal development
  • NF-ΚB

ASJC Scopus subject areas

  • Neuroscience(all)

Fingerprint Dive into the research topics of 'Distinction between differentiation, cell cycle, and apoptosis signals in PC12 cells by the nerve growth factor mutant Δ9/13, which is selective for the p75 neurotrophin receptor'. Together they form a unique fingerprint.

Cite this