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Intracellular Aβ42 Aggregation Leads to Cellular Thermogenesis.

Chyi Wei Chung1, Amberley D Stephens1, Tasuku Konno2

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Alzheimer's disease amyloid beta (Aβ42) aggregation increases cell temperature, a rise reversed by inhibitors. This finding aids in developing new diagnostic assays for potential Alzheimer's treatments.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Neuroscience

Background:

  • Amyloid beta (Aβ42) aggregation is a key feature of Alzheimer's disease (AD).
  • The intracellular biochemical changes driving Aβ42 aggregation remain unclear.
  • Cellular stress and thermogenesis are potentially linked to protein aggregation.

Purpose of the Study:

  • To investigate the relationship between Aβ42 aggregation and intracellular temperature changes.
  • To explore the potential of using thermometry for screening AD therapeutic candidates.
  • To elucidate the biophysical factors influencing heat retention in Aβ peptides.

Main Methods:

  • Intracellular thermometry using fluorescent polymeric thermometers in live cells.
  • Treatment with Aβ42 aggregation inhibitors.
  • Classical molecular dynamics simulations of model Aβ peptides.

Main Results:

  • Aβ42 aggregation in cells causes a measurable increase in average intracellular temperature.
  • This temperature rise is reduced by Aβ42 aggregation inhibitors.
  • Molecular dynamics revealed that ions, peptide morphology, and water interactions influence Aβ heat retention.

Conclusions:

  • Aβ42 aggregation contributes to cellular thermogenesis, independent of mitochondrial damage.
  • Intracellular ionic conditions can promote Aβ aggregation and heat retention, potentially accelerating AD progression.
  • The study presents a novel diagnostic assay for screening small-molecule inhibitors against amyloid aggregation in relevant cellular environments.