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Chronic oral administration of adipoRon reverses cognitive impairments and ameliorates neuropathology in an Alzheimer’s disease mouse model

Abstract

Circulating adiponectin (APN) levels decrease with age and obesity. On the other hand, a reduction in APN levels is associated with neurodegeneration and neuroinflammation. We previously showed that aged adiponectin knockout (APN−/−) mice developed Alzheimer’s like pathologies, cerebral insulin resistance, and cognitive impairments. More recently, we also demonstrated that APN deficiency increased Aβ-induced microglia activation and neuroinflammatory responses in 5xFAD mice. There is compelling evidence that deregulated insulin activities or cerebral insulin resistance contributes to neuroinflammation and Alzheimer’s disease (AD) pathogenesis. Here, we demonstrated that APN levels were reduced in the brain of AD patients and 5xFAD mice. We crossbred 5xFAD mice with APN−/− mice to generate APN-deficient 5xFAD (5xFAD;APN−/−). APN deficiency in 5xFAD mice accelerated amyloid loading, increased cerebral amyloid angiopathy, and reduced insulin-signaling activities. Pharmacokinetics study demonstrated adipoRon (APN receptor agonist) was a blood–brain barrier penetrant. AdipoRon improved neuronal insulin-signaling activities and insulin sensitivity in vitro and in vivo. Chronic adipoRon treatment improved spatial memory functions and significantly rescued neuronal and synaptic loss in 5xFAD and 5xFAD;APN−/− mice. AdipoRon lowered plaque and Aβ levels in AD mice. AdipoRon also exerted anti-inflammatory effects by reducing microglial and astrocytes activation as well as suppressing cerebral cytokines levels. The microglial phagocytic activity toward Aβ was restored after adipoRon treatment. Our results indicated that adipoRon exerts multiple beneficial effects providing important therapeutic implications. We propose chronic adipoRon administration as a potential treatment for AD.

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Fig. 1: APN deficiency in human AD brain tissues and AD mouse model.
Fig. 2: Deficiency of adiponectin leads to more severe memory decline and neuropathology.
Fig. 3: AdipoRon crosses blood–brain barrier and enhances insulin sensitivity and ameliorates insulin resistance in AD mouse model.
Fig. 4: AdipoRon improves cognitive functions and restores neuronal and synaptic densities in AD mouse model.
Fig. 5: AdipoRon reduces amyloid pathology in the 9-month old AD mouse models.
Fig. 6: AdipoRon reduces microgliosis, astrogliosis, and neuroinflammatory responses in 9-month old AD mouse models.

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Acknowledgements

We thank Prof. Kiren Rockenstein (Salk Institute) in sharing the immortalized mouse hippocampal HT-22 neuronal cell line. We also thank the technical staffs in the Faculty Core Facility, HKU, in assisting the confocal microscopy and IMARIS software operation. We are also grateful to the Brain Bank, NIHR BRC at Imperial College and Alzheimer’s Research, to provide human paraffin sections and human CSF. This work was supported by grants to RC-LN from the Health & Medical Research Fund (ref no. 03143856) and Chan Kin Shing Charitable Trust to K-HC. This work was also partly supported by grants to ML from the Hong Kong General Research Fund (GRF/HKBU12101417, GRF/HKBU12100618) and the Health & Medical Research Fund (HMRF/15163481, HMRF14150811). This work was also partly supported by grants to S-SKD from the Hong Kong Innovation Technology Fund (ITS/253/14).

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Ng, R.CL., Jian, M., Ma, O.KF. et al. Chronic oral administration of adipoRon reverses cognitive impairments and ameliorates neuropathology in an Alzheimer’s disease mouse model. Mol Psychiatry 26, 5669–5689 (2021). https://doi.org/10.1038/s41380-020-0701-0

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