GIP Affects Neuronal Microtubule Acetylation by Regulating αTAT1 Degradation
Beibei Guo1,2, Yan Yue1, Xiaoqian Luo1
1Jiangsu Key Laboratory of Tissue Engineering and Neuroregeneration, Key Laboratory of Neuroregeneration of Ministry of Education, co-Innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu, China.
Cytoskeleton (Hoboken, N.J.)
|February 17, 2026
Summary
Glucose-dependent insulinotropic polypeptide (GIP) enhances microtubule stability and promotes axonal regeneration after spinal cord injury by protecting a key enzyme from degradation. This finding offers a potential strategy for nerve repair.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Spinal cord injury impairs axonal regeneration due to limited understanding of intrinsic repair mechanisms.
- Microtubule stability, regulated by post-translational modifications, is crucial for axonal growth in mature neurons.
- Glucose-dependent insulinotropic polypeptide (GIP) and its receptor (GIPR) have known roles beyond endocrine signaling, but their function in neuronal cytoskeletal regulation is unclear.
Purpose of the Study:
- To investigate the effects of GIP on neuronal cytoskeletal regulation, specifically microtubule stability and axonal growth.
- To elucidate the molecular mechanisms by which GIP influences microtubule dynamics in neurons.
- To explore the potential of GIP signaling as a therapeutic strategy for promoting neuronal regeneration after injury.
Main Methods:
- Cultured cortical neurons were treated with GIP to assess its impact on microtubule stability and axonal growth.
- The study examined the effect of GIP on the number of axons crossing an inhibitory chondroitin sulfate proteoglycan (CSPG) barrier.
- Mechanistic investigations involved analyzing the regulation of α-tubulin N-acetyltransferase 1 (αTAT1) by GIP, focusing on ubiquitination and proteasomal degradation.
Main Results:
- GIP treatment significantly enhanced microtubule stability in cultured cortical neurons.
- GIP increased the number of axons successfully navigating an inhibitory CSPG border.
- GIP promoted microtubule acetylation by stabilizing αTAT1, the primary α-tubulin acetyltransferase, through suppression of its ubiquitination and subsequent proteasomal degradation in inhibitory conditions.
Conclusions:
- GIP/GIPR signaling modulates microtubule dynamics, representing a novel mechanism for regulating neuronal cytoskeletal function.
- GIP enhances axonal growth and regeneration potential, particularly in inhibitory environments characteristic of spinal cord injury.
- This study identifies GIP as a potential therapeutic agent to reactivate neuronal growth machinery, offering a promising avenue for spinal cord injury treatment.
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