ZFP36-mediated ZBP1 degradation inhibits microglia pro-inflammatory and NLRP3 inflammasome activation in Alzheimer's disease.

Alzheimer's disease (AD) is a heterogeneous disease with limited treatment efficacy. Identifying novel molecular targets and mechanisms is therefore crucial for developing therapeutic strategies. Zinc finger protein 36 (ZFP36) has not been reported in AD. This study found that the hippocampus of APP/PS1 mice showed ZFP36 upregulation. Using recombinant adeno-associated virus to overexpress ZFP36 improved the cognitive function of APP/PS1 mice, as assessed by Morris maze and Y maze tests. Furthermore, ZFP36 overexpression reduced Aβ deposition, expression of pro-inflammatory markers, and inhibited NLRP3 inflammasome activation in the hippocampus. These inhibitory effects of ZFP36 overexpression on the aforementioned proteins were also observed in Aβ₁₋₄₂-treated BV-2 cells. mRNA sequencing identified Z-DNA Binding Protein 1 (ZBP1) as a target of ZFP36. After ZFP36 overexpression, ZBP1 was downregulated in the hippocampus and Aβ1-42-treated BV-2 cells. The interaction between ZFP36 and ZBP1 RNA was verified by RIP-PCR, and ZFP36 was shown to promote the degradation of ZBP1 mRNA. The inhibitory effects of ZFP36 on the NLRP3 inflammasome activation and microglial pro-inflammatory activation was reversed by ZBP1 overexpression. In summary, ZFP36 inhibits microglia pro-inflammatory and NLRP3 inflammasome activation through promoting the degradation of ZBP1 mRNA, thereby ameliorating cognitive deficits of APP/PS1 mice.