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Published on: August 15, 2012
GCN5L1 Aggravates Postherpetic Neuralgia Through Regulating Microglial Mitochondrial Fission-Fusion Homeostasis
Wang Li1, Xin Cao2, Shenghan Wang1
1Department of Anesthesiology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China.
Abstract:
Postherpetic neuralgia (PHN) is a debilitating chronic pain condition following varicella-zoster virus (VZV) reactivation, characterised by persistent neuroinflammation. However, the intracellular mechanisms that drive microglial activation and sustained pain sensitisation remain poorly understood. Due to mice having no VZV infection receptor, herpes simplex virus type 1 (HSV-1) infection is a well-established PHN mice model. Here, we identified GCN5L1, a mitochondrial acetylation modulator, as a critical regulator of microglial mitochondrial dynamics and a key contributor to PHN pathogenesis. We found that GCN5L1 was markedly upregulated in the spinal dorsal horn after PHN, particularly located in microglia. Microglial Gcn5l1 deficiency attenuated HSV-1-induced neuroinflammatory responses and alleviated mechanical allodynia, whereas Gcn5l1 overexpression exacerbated neuroinflammatory responses both in vivo and in vitro. Mechanistically, GCN5L1 promoted mitochondrial fission and impaired oxidative metabolism by enhancing DRP1 acetylation, without altering the expression of canonical fission-fusion regulators. Restoration of mitochondrial fission using MFI8 intrathecally reversed the anti-inflammatory and analgesic effects of Gcn5l1 deficiency, confirming that GCN5L1 mediated pain sensitisation through mitochondrial fission-fusion in PHN. Finally, inhibiting GCN5L1 by AAV-shGCN5L1 intrathecally suppressed neuroinflammation and mechanical allodynia in PHN mice. These findings uncovered that GCN5L1 aggravated neuroinflammation and PHN through regulating microglial mitochondrial fission-fusion homeostasis, offering new insights and potential feasibility in clinical translation for PHN management.
Insights
Researchers found that GCN5L1, a mitochondrial protein, drives neuroinflammation and pain in postherpetic neuralgia (PHN) by altering microglial mitochondrial dynamics. Inhibiting GCN5L1 offers a potential therapeutic strategy for PHN management.
Area of Science:
- Neuroscience
- Molecular Biology
- Pain Research
Background:
- Postherpetic neuralgia (PHN) is a chronic pain condition resulting from varicella-zoster virus (VZV) reactivation, involving persistent neuroinflammation.
- The precise intracellular mechanisms governing microglial activation and sustained pain sensitization in PHN are not fully understood.
Purpose of the Study:
- To investigate the role of GCN5L1, a mitochondrial acetylation modulator, in microglial activation and mitochondrial dynamics during PHN pathogenesis.
- To explore GCN5L1 as a potential therapeutic target for alleviating PHN symptoms.
Main Methods:
- Utilized a herpes simplex virus type 1 (HSV-1) infection mouse model to mimic PHN.
- Assessed GCN5L1 expression and localization in the spinal dorsal horn.
- Manipulated GCN5L1 levels in microglia (in vivo and in vitro) and evaluated neuroinflammation and pain behaviors.
- Investigated the impact of GCN5L1 on mitochondrial dynamics (fission/fusion) and oxidative metabolism.
- Tested the therapeutic potential of inhibiting GCN5L1 using intrathecal AAV-shGCN5L1.
Main Results:
- GCN5L1 expression was significantly upregulated in microglia within the spinal dorsal horn following PHN induction.
- Microglial GCN5L1 deficiency attenuated neuroinflammation and mechanical allodynia, while overexpression exacerbated these responses.
- GCN5L1 promoted mitochondrial fission and impaired oxidative metabolism by enhancing DRP1 acetylation.
- Restoring mitochondrial fission reversed the anti-inflammatory and analgesic effects of Gcn5l1 deficiency.
- Intrathecal inhibition of GCN5L1 effectively suppressed neuroinflammation and mechanical allodynia in PHN mice.
Conclusions:
- GCN5L1 is a critical regulator of microglial mitochondrial dynamics and plays a significant role in aggravating neuroinflammation and pain sensitization in PHN.
- Targeting GCN5L1 presents a promising therapeutic avenue for managing postherpetic neuralgia.
