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ATF4 Exacerbates Cerebral Infarction-Induced Sensory Dysfunction via HDAC1/DNMT1/GPX4 Signaling
Bingtuan Lu1, Ninghui Mu1, Pu Li2
1Department of General Practice, The First People's Hospital of Yunnan Province, 650032, China; The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, 650032, China.
Activating transcription factor 4 (ATF4) exacerbates cerebral infarction and sensory dysfunction. Reducing ATF4 levels protects brain tissue and restores function by inhibiting ferroptosis via DNMT1-mediated GPX4 regulation.
Area of Science:
- Neuroscience
- Molecular Biology
- Pathology
Background:
- Cerebral infarction is a leading cause of death and disability.
- Neuronal degeneration and sensory dysfunction are critical secondary consequences.
Purpose of the Study:
- To investigate the role of Activating Transcription Factor 4 (ATF4) in cerebral infarction.
- To elucidate the molecular mechanisms underlying ATF4's involvement.
Main Methods:
- Middle cerebral artery occlusion (MCAO) model for cerebral infarction.
- Histological analysis (Nissl), gene expression (IHC, IF, Western blot), and protein interactions (Co-IP, ChIP, luciferase assays).
- Cellular assays (CCK-8, PI, TUNEL) assessed cell viability and apoptosis.
Main Results:
- ATF4 was upregulated in cerebral infarction models.
- ATF4 knockdown reduced infarct size, improved sensory function, and suppressed neuronal ferroptosis.
- ATF4 activated DNA methyltransferase 1 (DNMT1), leading to decreased glutathione peroxidase 4 (GPX4) expression via DNA methylation.
Conclusions:
- ATF4 knockdown offers protection against cerebral infarction and sensory deficits.
- The protective mechanism involves inhibiting DNMT1-mediated GPX4 methylation, thereby reducing neuronal ferroptosis.
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