Related Experiment Video

Updated: Jul 20, 2026

Fractionation for Resolution of Soluble and Insoluble Huntingtin Species
07:08

Fractionation for Resolution of Soluble and Insoluble Huntingtin Species

Published on: February 27, 2018

Mitochondrial Dysfunction in Huntington's Disease; Interplay Between HSF1, p53 and PGC-1α Transcription Factors

Taylor A Intihar1, Elisa A Martinez2, Rocio Gomez-Pastor1

  • 1Department of Neuroscience, School of Medicine, University of Minnesota, Minneapolis, MN, United States.

Frontiers in Cellular Neuroscience
|April 4, 2019
PubMed

Insights

Huntington's disease (HD) involves mutant huntingtin (mHTT) protein aggregation and neuronal death. This review explores how HSF1 may link p53 and PGC-1α pathways to mitochondrial dysfunction in HD.

Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Huntington's disease (HD) is a neurodegenerative disorder caused by CAG repeat expansion in the huntingtin (HTT) gene, leading to protein misfolding and neuronal loss, particularly in the striatum.
  • Medium spiny neurons (MSNs) are particularly vulnerable in HD, with mutant huntingtin (mHTT) causing mitochondrial dysfunction and cell death.
  • The roles of transcription factors p53 and PGC-1α in regulating mitochondrial function and apoptosis in HD are established, but their precise interaction remains unclear.

Purpose of the Study:

  • To review the potential role of Heat Shock Factor 1 (HSF1) in mediating mitochondrial dysfunction in Huntington's disease.
  • To propose a unifying mechanism integrating the p53 and PGC-1α pathways in HD pathogenesis through HSF1.
  • To discuss the implications of HSF1 in regulating protein homeostasis and its connection to mitochondrial health in HD.

Main Methods:

  • Literature review synthesizing existing research on HD, mHTT, p53, PGC-1α, and HSF1.
  • Analysis of the interconnectedness of stress response pathways and mitochondrial regulation.
  • Integration of findings to propose a novel mechanistic model for HD pathogenesis.

Main Results:

  • Evidence suggests HSF1 is implicated in mitochondrial function and influences p53 and PGC-1α levels in various cellular contexts.
  • HSF1's known role in protein homeostasis may be critical for mitigating mHTT aggregation and toxicity.
  • The proposed model suggests HSF1 acts as a central mediator connecting p53 and PGC-1α dependent responses in HD.

Conclusions:

  • HSF1 may play a significant role in the mitochondrial dysfunction observed in Huntington's disease.
  • A unifying mechanism involving HSF1 offers a new perspective on how p53 and PGC-1α pathways contribute to HD.
  • Targeting HSF1 could represent a potential therapeutic strategy for Huntington's disease by addressing mitochondrial dysfunction and protein aggregation.

Keywords:
Huntington (disease)PGC-1αheat shock factor 1 (HSF1)mitochondrial dysfunctionp53

More Related Videos

Assessing Mitochondrial Function in Sciatic Nerve by High-Resolution Respirometry08:19

Assessing Mitochondrial Function in Sciatic Nerve by High-Resolution Respirometry

Published on: May 5, 2022

Using Live Cell STED Imaging to Visualize Mitochondrial Inner Membrane Ultrastructure in Neuronal Cell Models08:48

Using Live Cell STED Imaging to Visualize Mitochondrial Inner Membrane Ultrastructure in Neuronal Cell Models

Published on: June 30, 2023

Related Concept Videos

Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial precursors...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...
Huntington Disease l: Introduction01:21

Huntington Disease l: Introduction

Huntington disease or HD is a progressive, fatal neurodegenerative disorder inherited in an autosomal dominant pattern.PathophysiologyIt is caused by expansion of the CAG trinucleotide repeat in the HTT gene on chromosome 4 (4p16.3), producing an abnormal huntingtin protein with an expanded polyglutamine tract. This misfolded protein disrupts cellular function, leading to neuronal death. Normal alleles have ≤26 repeats, 27–35 are intermediate (risk of expansion), 36–39 show reduced penetrance,...