The catalytic subunit of telomerase is expressed in developing brain neurons and serves a cell survival-promoting function

Weiming Fu, Michael Killen, Carsten Culmsee, Sonu Dhar, Tej K. Pandita, Mark P. Mattson

Research output: Contribution to journalArticle

Abstract

Telomerase, a specialized reverse transcriptase (RT) linked to cell immortalization and cancer, has been thought not to be expressed in postmitotic cells. We now report that telomerase activity and its essential catalytic subunit, telomerase reverse transcriptase (TERT), are expressed in neurons in the brains of rodents during embryonic and early postnatal development, and are subsequently downregulated. Suppression of TERT expression in cultured embryonic hippocampal neurons increases their vulnerability to apoptosis and excitotoxicity. Overexpression of TERT in PC12 cells suppresses apoptosis induced by trophic factor withdrawal. TERT exerts its anti-apoptotic action at an early stage of the cell death process prior to mitochondrial dysfunction and caspase activation. TERT may serve a neuron survival-promoting function in the developing brain, and downregulation of TERT in the adult brain may contribute to increased neuronal vulnerability in various age-related neurodegenerative disorders.

Original languageEnglish (US)
Pages (from-to)3-15
Number of pages13
JournalJournal of Molecular Neuroscience
Volume14
Issue number1-2
StatePublished - 2000
Externally publishedYes

Keywords

  • Alzheimer's disease
  • Apoptosis
  • Caspase
  • Cerebral cortex
  • Hippocampus
  • Mitochondrial transmembrane potential
  • Neurotrophic factor
  • Parkinson's disease

ASJC Scopus subject areas

  • Neuroscience(all)
  • Biochemistry
  • Genetics

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