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Involvement of CRMP2 Phosphorylation in Amyloid Beta-induced Tau Phosphorylation of Hippocampal Neurons in Alzheimer's Disease Mouse Model

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Journal Mol Neurobiol
Date 2025 Feb 1
PMID 39891817
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Abstract

Alzheimer's disease (AD) is the most common form of dementia, characterized by amyloid-β (Aβ) deposition and the formation of neurofibrillary tangles composed of hyperphosphorylated tau. Collapsin response mediator protein 2 (CRMP2), a microtubule (MT)-binding protein, regulates MT dynamics and is phosphorylated at Ser522 by cyclin-dependent kinase 5. Previous studies have shown increased CRMP2 phosphorylation at Ser522 (CRMP2-pSer522) in early AD stages and AD mouse models, where it colocalizes with phosphorylated tau. However, the role of CRMP-pSer522 in AD pathology remains unclear. In this study, we generated double transgenic mice by crossing tau Tg (PS19) mice and CRMP2 S522A knock-in (CRMP2KI) mice, in which S522 of CRMP2 was replaced with alanine to create a phospho-defective model. No significant change in tau phosphorylation was observed in the hippocampus of tau Tg; CRMP2KI mice compared to tau Tg littermates. However, when Aβ25-35 oligomers were injected into the hippocampus, tau phosphorylation was significantly reduced in Aβ-injected tau Tg; CRMP2KI mice compared to Aβ-injected tau Tg controls. These findings suggest that CRMP2 phosphorylation at Ser522 promotes Aβ-induced tau phosphorylation in this mouse model of AD.

References
1.
Bloom G . Amyloid-β and tau: the trigger and bullet in Alzheimer disease pathogenesis. JAMA Neurol. 2014; 71(4):505-8. DOI: 10.1001/jamaneurol.2013.5847. View

2.
Goedert M, Crowther R, Garner C . Molecular characterization of microtubule-associated proteins tau and MAP2. Trends Neurosci. 1991; 14(5):193-9. DOI: 10.1016/0166-2236(91)90105-4. View

3.
Gong C, Liu F, Grundke-Iqbal I, Iqbal K . Post-translational modifications of tau protein in Alzheimer's disease. J Neural Transm (Vienna). 2004; 112(6):813-38. DOI: 10.1007/s00702-004-0221-0. View

4.
Martin L, Latypova X, Terro F . Post-translational modifications of tau protein: implications for Alzheimer's disease. Neurochem Int. 2011; 58(4):458-71. DOI: 10.1016/j.neuint.2010.12.023. View

5.
Neddens J, Temmel M, Flunkert S, Kerschbaumer B, Hoeller C, Loeffler T . Phosphorylation of different tau sites during progression of Alzheimer's disease. Acta Neuropathol Commun. 2018; 6(1):52. PMC: 6027763. DOI: 10.1186/s40478-018-0557-6. View