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High cholesterol and 27-hydroxycholesterol contribute to phosphorylation of tau protein by impairing autophagy causing learning and memory impairment in C57BL/6J mice
Abstract
Cholesterol and its oxidative derivative 27-hydroxycholesterol (27-OHC), synthesized by CYP27A1, play an important role in Alzheimer's disease (AD) and phosphorylation of tau might be partly responsible for its pathogenesis. To investigate whether cholesterol and 27-OHC affected learning and memory through autophagy-mediated phosphorylation of tau, male C57BL/6J mice were administrated with 2% cholesterol diet, CYP27A1-short-hairpin RNA (CYP27A1-shRNA) and 3-methyladenine (3-MA). The results show that dietary cholesterol induces learning and memory impairment by upregulating the expression of brain CYP27A1 and increasing the levels of 27-OHC and 24S-hydroxycholesterol (24S-OHC). The expressions of total-tau (t-tau), phosphorylated-tau (p-tau) protein, glycogen synthase kinase-3β (GSK-3β) and cyclin-dependent kinase 5 (CDK5) are also significantly upregulated in this group. In addition, reduced expressions of Beclin-1 protein and microtubule-associated protein 1 light chain 3 (LC3B) mRNA, over-expression of mammalian target of rapamycin (mTOR) protein suggest that autophagy is impaired during cholesterol burden. However, using of CYP27A1-shRNA remarkably downregulates the expression of brain CYP27A1. Decreased 27-OHC levels in serum and brain, lower expressions of t-tau and p-tau protein are observed in mice treated with CYP27A1-shRNA+2% cholesterol diet. Furthermore, 3-MA causes lower Beclin-1, higher mTOR and p62 on both gene and protein levels, while the expression of t-tau…
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“Moreover, abnormal cholesterol metabolism is associated with the initiation of inflammation, amyloid-beta production and accumulation, tau protein phosphorylation and synaptic damage26,27.”
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“Blocking autophagic flux by Bafilomycin A1 increases tau and lysosomal lipid accumulation84, while increased cholesterol and CE impairs autophagy function and tau degradation18,27.”
From GRAMD1B is a regulator of lipid homeostasis, autophagic flux and phosphorylated tau (2025) · cites this paper as [27]
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Cited by
Sorted by citations
GRAMD1B is a regulator of lipid homeostasis, autophagic flux and phosphorylated tau
Acosta Ingram, D., Turkes, E., Kim, T. Y., Vo, S., Sweeney, N., Bonte, M.-A., Rutherford, R., Julian, D. L., Pan, M., Marsh, J., et al. (2025) · Nature Communications · doi:10.1038/s41467-025-58585-w · Cited by 12
Niu, T., Wang, S., Zhang, H., Zhu, W., Liu, K., Zhou, X., Sun, R., Niu, D., & Yuan, Y. (2025) · Experimental & Molecular Medicine · doi:10.1038/s12276-025-01534-w · Cited by 7
Metadata
- Authors
- Wang, T., Zhang, X., Wang, Y., Liu, W., Wang, L., Hao, L., Ju, M., & Xiao, R.
- ORCID
- Venue
- The Journal of Nutritional Biochemistry
- Publisher
- Elsevier BV
- Published
- 2022-08
- Volume
- 106
- Pages
- 109016
- ISSN
- 0955-2863
- Cited by
- 30
- References
- 3
- Language
- en
- Licence
- Funders
- National Natural Science Foundation of China (81330065, 81673149, 81973021)
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