SIRT1 knockdown promotes neural differentiation and attenuates the heat shock response

Diana J. Liu, David Hammer, Daniel Komlos, Kuang Yu Chen, Bonnie Firestein-Miller, Alice Liu

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Neurons have a limited capacity for heat shock protein (HSP) induction and are vulnerable to the pathogenic consequence of protein misfolding and aggregation as seen in age-related neurodegenerative diseases. Sirtuin 1 (SIRT1), an NAD+-dependent lysine deacetylase with important biological functions, has been shown to sustain the DNA-binding state of HSF1 for HSP induction. Here we show that differentiation and maturation of embryonic cortical neurons and N2a neuroprogenitor cells is associated with decreases in SIRT1 expression and heat shock-dependent induction of HSP70 protein. Tests of a pharmacological activator and an inhibitor of SIRT1 affirm the regulatory role of SIRT1 in HSP70 induction. Protein cross-linking studies show that nuclear SIRT1 and HSF1 form a co-migrating high molecular weight complex upon stress. The use of retroviral vectors to manipulate SIRT1 expression in N2a cells show that shRNA-mediated knock down of SIRT1 causes spontaneous neurite outgrowth coincident with reduced growth rate and decreased induction of hsp70-reporter gene, whereas SIRT1 over-expression blocks the induced neural differentiation of N2a cells. Our results suggest that decreased SIRT1 expression is conducive to neuronal differentiation and this decrease contributes to the attenuated induction of HSPs in neurons.

Original languageEnglish (US)
Pages (from-to)1224-1235
Number of pages12
JournalJournal of Cellular Physiology
Volume229
Issue number9
DOIs
StatePublished - Jan 1 2014

Fingerprint

Sirtuin 1
Heat-Shock Response
Neurons
Heat-Shock Proteins
Neurodegenerative diseases
Hot Temperature
Proteins
Reporter Genes
Neurodegenerative Diseases
NAD
Small Interfering RNA
Lysine
Cell Differentiation
Shock
Agglomeration
Genes
Molecular Weight
Molecular weight
Pharmacology

All Science Journal Classification (ASJC) codes

  • Physiology
  • Clinical Biochemistry
  • Cell Biology

Cite this

Liu, Diana J. ; Hammer, David ; Komlos, Daniel ; Chen, Kuang Yu ; Firestein-Miller, Bonnie ; Liu, Alice. / SIRT1 knockdown promotes neural differentiation and attenuates the heat shock response. In: Journal of Cellular Physiology. 2014 ; Vol. 229, No. 9. pp. 1224-1235.
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SIRT1 knockdown promotes neural differentiation and attenuates the heat shock response. / Liu, Diana J.; Hammer, David; Komlos, Daniel; Chen, Kuang Yu; Firestein-Miller, Bonnie; Liu, Alice.

In: Journal of Cellular Physiology, Vol. 229, No. 9, 01.01.2014, p. 1224-1235.

Research output: Contribution to journalArticle

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