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Basic Science and Pathogenesis.

Shatakshi Shukla1, Ashlesha Kadam2, Shanikumar Goyani1

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Alzheimer's disease (AD) involves mitochondrial calcium (mCa2+) issues in all brain cells, with neurons being most vulnerable. Astrocytes and microglia show distinct mCa2+ signaling, offering new therapeutic targets for AD.

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Area of Science:

  • Neuroscience
  • Mitochondrial Biology
  • Alzheimer's Disease Research

Background:

  • Mitochondrial dysfunction and excessive mitochondrial calcium (mCa2+) accumulation in neurons are early hallmarks of Alzheimer's disease (AD).
  • AD pathology involves complex interactions between neurons, microglia, and astrocytes, but cell-specific mechanisms of mitochondrial calcium handling remain poorly understood.
  • This study investigates cell-type-specific differences in mCa2+ flux and signaling in the context of AD.

Purpose of the Study:

  • To investigate cell-type-specific differences in mitochondrial calcium (mCa2+) flux and signaling in neuronal, microglial, and astrocyte cell lines under normal and AD conditions.
  • To understand the role of cell-specific mitochondrial calcium dynamics in Alzheimer's disease pathology.
  • To identify potential therapeutic targets by elucidating the regulatory mechanisms of mCa2+ signaling dysregulation.

Main Methods:

  • Generated human neuronal (SH-SY5Y), microglia (HMC3), and astrocyte (SVGp12) cell lines with AD-linked APP mutations (APPswe/F/L).
  • Assessed mitochondrial calcium uniporter (mtCU) expression, mCa2+ influx/efflux using Fura-FF, and mitochondrial calcium retention capacity (CRC).
  • Measured ATP, NADH, cell death, mitochondrial structure, membrane potential, mitochondrial ROS, and lactylation to evaluate cellular bioenergetics and mitochondrial function.

Main Results:

  • Mitochondrial dysfunction was observed in all brain cell types, with neurons exhibiting the highest susceptibility to cell death and reduced bioenergetics.
  • Astrocytes and microglia demonstrated elevated mCa2+ signaling, higher calcium uptake rates, and greater calcium retention capacity compared to neurons.
  • Cell-specific differences in lactylation were identified, with significantly higher expression in microglia and astrocytes, suggesting a role in mitochondrial functional regulation.

Conclusions:

  • Cell-specific mitochondrial calcium (mCa2+) signaling dynamics significantly influence the metabolic and pathophysiological contributions of different brain cells to Alzheimer's disease.
  • Understanding the regulatory mechanisms of mCa2+ signaling dysregulation in each cell type is crucial for developing targeted therapeutic strategies.
  • The findings offer insights into mitochondrial bioenergetics, cell death pathways, and AD progression, supporting novel therapeutic approaches for AD.