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Young bone marrows transplantation rejuvenates immune cells, attenuate cerebral Aβ accumulation and related pathologies in Alzheimer’s disease model mouse

ABSTRACT: Immunesenescence contributes to systematic aging and participates in the pathogenesis of Alzheimer’s disease (AD). To define the potential of immune rejuvenation in AD therapy, we reconstituted the immune systems of aged APP/PS1 mice through bone marrow transplantation (BMT). Single cell RNA sequencing (ScRNA-seq) of peripheral blood mononuclear cells (PBMCs) indicated that young BMT reverse the expression of aging- and AD-related genes in multiple cell types of PBMCs. Plasma proteome profiling also indicated the reduction of the plasma level of senescence-associated secretory phenotype (SASP) proteins after young BMT. Young BMT significantly reduced central and peripheral Aβ levels, alleviated brain Aβ plaque burden, neuronal degeneration, neuroinflammation, and behavioral deficits in the aged APP/PS1 mice. These effects occurred with the improved Aβ capacity of peripheral monocytes. Collectively, our study demonstrated that rejuvenation of immune system could decrease brain Aβ deposition and other AD-type pathologies, representing a potential therapeutic approach for AD.

ORGANISM(S): Mus musculus

PROVIDER: GSE235527 | GEO | 2023/06/27

REPOSITORIES: GEO

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Project description:Astrocytes, one of the most resilient cells in the brain, transform into reactive astrocytes in response to toxic proteins such as amyloid beta (Aβ) in Alzheimer’s disease (AD). However, reactive astrocyte-mediated non-cell autonomous neuropathological mechanism is not fully understood yet. We aimed our study to find out whether Aβ-induced proteotoxic stress affects the expression of autophagy genes and the modulation of autophagic flux in astrocytes, and if yes, how Aβ-induced autophagy-associated genes are involved Aβ clearance in astrocytes of animal model of AD. Whole RNA sequencing (RNA-seq) was performed to detect gene expression patterns in Aβ-treated human astrocytes in a time-dependent manner. To verify the role of astrocytic autophagy in an AD mouse model, we developed AAVs expressing shRNAs for MAP1LC3B/LC3B (LC3B) and Sequestosome1 (SQSTM1) based on AAV-R-CREon vector, which is a Cre recombinase-dependent gene-silencing system. Also, the effect of astrocyte-specific overexpression of LC3B on the neuropathology in AD (APP/PS1) mice was determined. Neuropathological alterations of AD mice with astrocytic autophagy dysfunction were observed by confocal microscopy and transmission electron microscope (TEM). Behavioral changes of mice were examined through novel object recognition test (NOR) and novel object place recognition test (NOPR). Here, we show that astrocytes, unlike neurons, undergo plastic changes in autophagic processes to remove Aβ. Aβ transiently induces expression of LC3B gene and turns on a prolonged transcription of SQSTM1 gene. The Aβ-induced astrocytic autophagy accelerates urea cycle and putrescine degradation pathway. Pharmacological inhibition of autophagy exacerbates mitochondrial dysfunction and oxidative stress in astrocytes. Astrocyte-specific knockdown of LC3B and SQSTM1 significantly increases Aβ plaque formation and hypertrophic reactive astrocytes in APP/PS1 mice, along with a significant reduction of neuronal marker and cognitive function. In contrast, astrocyte-specific overexpression of LC3B reduced Ab aggregates in the brain of APP/PS1 mice An increase of LC3B and SQSTM1 protein is found in astrocytes of the hippocampus in AD patients. Taken together, our data indicates that Aβ-induced astrocytic autophagic plasticity is an important cellular event to modulate Aβ clearance and maintain cognitive function in AD mice.

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Young bone marrows transplantation rejuvenates immune cells, attenuate cerebral Aβ accumulation and related pathologies in Alzheimer’s disease model mouse

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