Mechanistic description
Under neurodegenerative stress, astrocytes upregulate CD38, which triggers Erk MAPK signaling to promote tunneling nanotube (TNT) formation through M-Sec (TNFAIP2) and F-actin remodeling, enabling astrocyte-to-neuron mitochondrial transfer. These transferred mitochondria exhibit enhanced membrane potential and ATP production, restoring neuronal bioenergetics and reducing apoptosis. Disruption of astrocyte CD38 signaling (via CD38 knockout or Erk inhibition) impairs TNT formation and mitochondrial transfer, leading to accelerated neuronal loss in ALS/AD models. This predicts that pharmacologic CD38 agonism or direct administration of astrocyte-derived mitochondria will ameliorate motor/cognitive deficits in rodent neurodegeneration models.
Mechanism / pathway
- CD38
- Erk MAPK signaling and TNT formation
- ALS and Alzheimer's disease
Evidence for (5)
Transfer of mitochondria from astrocytes to neurons after stroke.
Ginsenoside Rb1 inhibits astrocyte activation and promotes transfer of astrocytic mitochondria to neurons against ischemic stroke.
Spatial transcriptomics reveal neuron-astrocyte synergy in long-term memory.
CD38 in Neurodegeneration and Neuroinflammation.
Aerobic Exercise Improves Cognitive Recovery in Mice with Chronic Cerebral Hypoperfusion by Modulating the Annexin-A1-MAPK Axis and Astrocyte Polarization.
Evidence against (2)
Evidence matrix
Supporting
- Transfer of mitochondria from astrocytes to neurons after stroke. PMID:27466127 · 2016 · Nature
- Ginsenoside Rb1 inhibits astrocyte activation and promotes transfer of astrocytic mitochondria to neurons against ischemic stroke. PMID:35696763 · 2022 · Redox Biol
- Spatial transcriptomics reveal neuron-astrocyte synergy in long-term memory. PMID:38326616 · 2024 · Nature
- CD38 in Neurodegeneration and Neuroinflammation. PMID:32085567 · 2020 · Cells
- Aerobic Exercise Improves Cognitive Recovery in Mice with Chronic Cerebral Hypoperfusion by Modulating the Annexin-A1-MAPK Axis and Astrocyte Polarization. PMID:39751866 · 2024 · Aging Dis
Contradicting
No contradicting evidence recorded.
Bayesian persona consensus
scidex.consensus.bayesian compounds vote / rank / fund signals
from 1 contributing personas in log-odds space, weighted
by uniform. Prior 50%.
Cite this hypothesis
Cite this hypothesis
etl-backfill (2026). Astrocyte CD38-erk Mapk signaling controls mitochondrial transfer to neurons vi…. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-a8d0be776e
@misc{scidex_hypothesis_ha8d0be7,
title = {Astrocyte CD38-erk Mapk signaling controls mitochondrial transfer to neurons vi…},
author = {etl-backfill},
year = {2026},
howpublished = {SciDEX hypothesis},
url = {https://prism.scidex.ai/hypotheses/h-a8d0be776e},
note = {SciDEX artifact hypothesis:h-a8d0be776e}
}