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Factors released by senescent human astrocytes disrupt the extracellular mitochondrial compartment and are sufficient to induce mitochondrial and redox dysfunction in neurons. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

September 8, 2026AntioxidantsOpen Access

Astrocyte Senescence Disrupts the Extracellular Mitochondrial Compartment and Compromises Bioenergetic Support to Human Neurons

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Authors

PAPedro Amorim LHLívia de Sá HayashideUniversidade Federal do Rio de Janeiro VLVitor Emanuel Leocadio

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Implication

In vitro study shows that senescent human astrocytes release damaged extracellular mitochondria and impair energy metabolism in human neurons, indicating a secretory driver of neurodegeneration.

Key Points

To determine how astrocyte senescence alters the extracellular mitochondrial compartment and impacts bioenergetic support to human neurons.
Induced cellular senescence in primary human astrocytes using doxorubicin and characterized intracellular mitochondrial morphology, dynamics proteins, and metabolic function.
Profiled the extracellular mitochondrial compartment by measuring particle quantity, membrane potential, and ATP content in astrocyte-conditioned media.
Treated human postmitotic neurons with conditioned medium from control or senescent astrocytes to measure mitochondrial biogenesis markers (TOMM20, PGC-1α), ROS levels, and metabolic activity.
Senescent astrocytes accumulated structurally damaged, fragmented mitochondria with increased fission, fusion, and biogenesis markers, yet displayed reduced membrane potential, intracellular ATP, and metabolic activity.
Conditioned medium from senescent astrocytes contained fewer extracellular mitochondrial particles, which exhibited lower membrane potential and diminished ATP compared to control medium.
Human postmitotic neurons cultured with senescent astrocyte medium failed to induce TOMM20 and PGC-1α, accumulating hydrogen peroxide, depleting ATP, and reducing metabolic activity without overt cytotoxicity.

Cite This Study

Amorim et al. (2026) studied this question.

synapsesocial.com/papers/6a9fd82058e84d0ff5b47689 https://doi.org/10.3390/antiox15091127

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September 8, 2026AntioxidantsOpen Access

Astrocyte Senescence Disrupts the Extracellular Mitochondrial Compartment and Compromises Bioenergetic Support to Human Neurons

View Full Paper

Ask AI

Bookmark

Authors

PAPedro Amorim LHLívia de Sá HayashideUniversidade Federal do Rio de Janeiro VLVitor Emanuel Leocadio

Discussion

Member takes

Implication

In vitro study shows that senescent human astrocytes release damaged extracellular mitochondria and impair energy metabolism in human neurons, indicating a secretory driver of neurodegeneration.

Key Points

To determine how astrocyte senescence alters the extracellular mitochondrial compartment and impacts bioenergetic support to human neurons.
Induced cellular senescence in primary human astrocytes using doxorubicin and characterized intracellular mitochondrial morphology, dynamics proteins, and metabolic function.
Profiled the extracellular mitochondrial compartment by measuring particle quantity, membrane potential, and ATP content in astrocyte-conditioned media.
Treated human postmitotic neurons with conditioned medium from control or senescent astrocytes to measure mitochondrial biogenesis markers (TOMM20, PGC-1α), ROS levels, and metabolic activity.
Senescent astrocytes accumulated structurally damaged, fragmented mitochondria with increased fission, fusion, and biogenesis markers, yet displayed reduced membrane potential, intracellular ATP, and metabolic activity.
Conditioned medium from senescent astrocytes contained fewer extracellular mitochondrial particles, which exhibited lower membrane potential and diminished ATP compared to control medium.
Human postmitotic neurons cultured with senescent astrocyte medium failed to induce TOMM20 and PGC-1α, accumulating hydrogen peroxide, depleting ATP, and reducing metabolic activity without overt cytotoxicity.

Cite This Study

Amorim et al. (2026) studied this question.

synapsesocial.com/papers/6a9fd82058e84d0ff5b47689 https://doi.org/10.3390/antiox15091127

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