Overexpression of heat shock factor 1 maintains TAR DNA binding protein 43 solubility via induction of inducible heat shock protein 70 in cultured cells

Pei Yi Lin, Oluwarotimi Folorunso, Giulio Taglialatela, Anson Pierce

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

TAR DNA binding protein 43 (TDP-43) is a nuclear protein that has been shown to have altered homeostasis in the form of neuronal nuclear and cytoplasmic aggregates in some familial and almost all cases of sporadic amyotrophic lateral sclerosis as well as 51% of frontotemporal lobar degeneration and 57% of Alzheimer's disease cases. Heat shock proteins (HSPs), such as HSP70, recognize misfolded or aggregated proteins and refold, disaggregate, or turn them over and are upregulated by the master transcription factor heat shock factor 1 (HSF1). Here, we explore the effect of HSF1 overexpression on proteotoxic stress-related alterations in TDP-43 solubility, proteolytic processing, and cytotoxicity. HSF1 overexpression reduced TDP-43-positive puncta concomitantly with upregulating HSP70 and HSP90 protein levels. HSF1 overexpression or pharmacological activation sustained TDP-43 solubility and significantly reduced truncation of TDP-43 in response to inhibition of the proteasome with Z-Leu-Leu-Leu-al, and this was reversed by HSF1 inhibition. HSF1 activation conferred protection against toxicity associated with TDP-43 C-terminal fragments without globally increasing the activity of the ubiquitin proteasome system (UPS) while concomitantly reducing the induction of autophagy, suggesting that HSF1 protection is an early event. In support of this, inhibition of HSP70 ATPase activity further reduced TDP-43 solubility. HSF1 knockout significantly increased TDP-43 insolubility and accelerated TDP-43 fragmentation in response to proteotoxic stress. Overall, this study shows that HSF1 overexpression protects against TDP-43 pathology by upregulation of chaperones, especially HSP70, rather than enhancing autophagy or the UPS during times of proteotoxic stress.

Original languageEnglish (US)
Pages (from-to)671-682
Number of pages12
JournalJournal of Neuroscience Research
Volume94
Issue number7
DOIs
StatePublished - Jul 1 2016

Fingerprint

HSP70 Heat-Shock Proteins
DNA-Binding Proteins
Solubility
Cultured Cells
Shock
Hot Temperature
Proteasome Endopeptidase Complex
Autophagy
Ubiquitin
Frontotemporal Lobar Degeneration
Protein Refolding
Nuclear Proteins
Heat-Shock Proteins
Protein C
Adenosine Triphosphatases
Alzheimer Disease
Homeostasis
Up-Regulation
Pharmacology
Pathology

Keywords

  • ALS
  • Alzheimer's disease
  • Heat shock factor 1
  • Heat shock proteins
  • Lou Gehrig's disease
  • Protein aggregation
  • RRID:AB_10979281
  • RRID:AB_10987450
  • RRID:AB_1659604
  • RRID:AB_2039260
  • RRID:AB_2532125
  • RRID:AB_2532126
  • RRID:AB_528498
  • RRID:AB_637828

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience

Cite this

Overexpression of heat shock factor 1 maintains TAR DNA binding protein 43 solubility via induction of inducible heat shock protein 70 in cultured cells. / Lin, Pei Yi; Folorunso, Oluwarotimi; Taglialatela, Giulio; Pierce, Anson.

In: Journal of Neuroscience Research, Vol. 94, No. 7, 01.07.2016, p. 671-682.

Research output: Contribution to journalArticle

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abstract = "TAR DNA binding protein 43 (TDP-43) is a nuclear protein that has been shown to have altered homeostasis in the form of neuronal nuclear and cytoplasmic aggregates in some familial and almost all cases of sporadic amyotrophic lateral sclerosis as well as 51{\%} of frontotemporal lobar degeneration and 57{\%} of Alzheimer's disease cases. Heat shock proteins (HSPs), such as HSP70, recognize misfolded or aggregated proteins and refold, disaggregate, or turn them over and are upregulated by the master transcription factor heat shock factor 1 (HSF1). Here, we explore the effect of HSF1 overexpression on proteotoxic stress-related alterations in TDP-43 solubility, proteolytic processing, and cytotoxicity. HSF1 overexpression reduced TDP-43-positive puncta concomitantly with upregulating HSP70 and HSP90 protein levels. HSF1 overexpression or pharmacological activation sustained TDP-43 solubility and significantly reduced truncation of TDP-43 in response to inhibition of the proteasome with Z-Leu-Leu-Leu-al, and this was reversed by HSF1 inhibition. HSF1 activation conferred protection against toxicity associated with TDP-43 C-terminal fragments without globally increasing the activity of the ubiquitin proteasome system (UPS) while concomitantly reducing the induction of autophagy, suggesting that HSF1 protection is an early event. In support of this, inhibition of HSP70 ATPase activity further reduced TDP-43 solubility. HSF1 knockout significantly increased TDP-43 insolubility and accelerated TDP-43 fragmentation in response to proteotoxic stress. Overall, this study shows that HSF1 overexpression protects against TDP-43 pathology by upregulation of chaperones, especially HSP70, rather than enhancing autophagy or the UPS during times of proteotoxic stress.",
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T1 - Overexpression of heat shock factor 1 maintains TAR DNA binding protein 43 solubility via induction of inducible heat shock protein 70 in cultured cells

AU - Lin, Pei Yi

AU - Folorunso, Oluwarotimi

AU - Taglialatela, Giulio

AU - Pierce, Anson

PY - 2016/7/1

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N2 - TAR DNA binding protein 43 (TDP-43) is a nuclear protein that has been shown to have altered homeostasis in the form of neuronal nuclear and cytoplasmic aggregates in some familial and almost all cases of sporadic amyotrophic lateral sclerosis as well as 51% of frontotemporal lobar degeneration and 57% of Alzheimer's disease cases. Heat shock proteins (HSPs), such as HSP70, recognize misfolded or aggregated proteins and refold, disaggregate, or turn them over and are upregulated by the master transcription factor heat shock factor 1 (HSF1). Here, we explore the effect of HSF1 overexpression on proteotoxic stress-related alterations in TDP-43 solubility, proteolytic processing, and cytotoxicity. HSF1 overexpression reduced TDP-43-positive puncta concomitantly with upregulating HSP70 and HSP90 protein levels. HSF1 overexpression or pharmacological activation sustained TDP-43 solubility and significantly reduced truncation of TDP-43 in response to inhibition of the proteasome with Z-Leu-Leu-Leu-al, and this was reversed by HSF1 inhibition. HSF1 activation conferred protection against toxicity associated with TDP-43 C-terminal fragments without globally increasing the activity of the ubiquitin proteasome system (UPS) while concomitantly reducing the induction of autophagy, suggesting that HSF1 protection is an early event. In support of this, inhibition of HSP70 ATPase activity further reduced TDP-43 solubility. HSF1 knockout significantly increased TDP-43 insolubility and accelerated TDP-43 fragmentation in response to proteotoxic stress. Overall, this study shows that HSF1 overexpression protects against TDP-43 pathology by upregulation of chaperones, especially HSP70, rather than enhancing autophagy or the UPS during times of proteotoxic stress.

AB - TAR DNA binding protein 43 (TDP-43) is a nuclear protein that has been shown to have altered homeostasis in the form of neuronal nuclear and cytoplasmic aggregates in some familial and almost all cases of sporadic amyotrophic lateral sclerosis as well as 51% of frontotemporal lobar degeneration and 57% of Alzheimer's disease cases. Heat shock proteins (HSPs), such as HSP70, recognize misfolded or aggregated proteins and refold, disaggregate, or turn them over and are upregulated by the master transcription factor heat shock factor 1 (HSF1). Here, we explore the effect of HSF1 overexpression on proteotoxic stress-related alterations in TDP-43 solubility, proteolytic processing, and cytotoxicity. HSF1 overexpression reduced TDP-43-positive puncta concomitantly with upregulating HSP70 and HSP90 protein levels. HSF1 overexpression or pharmacological activation sustained TDP-43 solubility and significantly reduced truncation of TDP-43 in response to inhibition of the proteasome with Z-Leu-Leu-Leu-al, and this was reversed by HSF1 inhibition. HSF1 activation conferred protection against toxicity associated with TDP-43 C-terminal fragments without globally increasing the activity of the ubiquitin proteasome system (UPS) while concomitantly reducing the induction of autophagy, suggesting that HSF1 protection is an early event. In support of this, inhibition of HSP70 ATPase activity further reduced TDP-43 solubility. HSF1 knockout significantly increased TDP-43 insolubility and accelerated TDP-43 fragmentation in response to proteotoxic stress. Overall, this study shows that HSF1 overexpression protects against TDP-43 pathology by upregulation of chaperones, especially HSP70, rather than enhancing autophagy or the UPS during times of proteotoxic stress.

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KW - RRID:AB_528498

KW - RRID:AB_637828

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