NeuralCipher Research overview
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Abstract Microglial hyper-activation drives Parkinson's disease (PD) progression, yet the upstream microenvironmental cues that sustain this neurotoxic state remain elusive. While α-synuclein (α-Syn) aggregation is a primary trigger, aging and PD are also characterized by severe microvascular degradation. However, the exact crosstalk between vascular-driven hypoxia and protein toxicity in microglial fate determination remains elusive. We integrated human single-cell RNA sequencing (scRNA-seq) data, a chronic progressive transgenic mouse model (9-month-old A53T), and an in vitro "double-hit" model. Neuropathological and immunofluorescence scanning analyses were employed to map the neurovascular unit and microglial phenotypes. The scRNA-seq analysis of human PD brains revealed a specific Disease-Associated Microglia (DAM) subset characterized by a profound upregulation of hypoxia and glycolysis pathways, with HIF1A acting as a central node. In vivo, 9-month-old A53T mice exhibited severe motor deficits and dopaminergic degeneration, accompanied by a dramatic reduction in CD31 + microvascular coverage in the substantia nigra. This structural vascular collapse created a functional hypoxic microenvironment, triggering prominent HIF1A accumulation and morphological pathological hypertrophy in microglia. Crucially, utilizing a high-resolution immunofluorescence screening of an in vitro double-hit model, we demonstrated that physical hypoxia synergistically amplifies α-Syn preformed fibril (PFF)-induced microglial hyper-reactivity, leading to massive intracellular accumulation of phosphorylated α-Syn (p-αSyn) and intense inflammatory polarization. Our multi-dimensional study proposes a novel "double-hit" paradigm: microvascular failure-induced hypoxia acts as a crucial metabolic amplifier, transitioning microglia from a protective state into a hyper-reactive, neurotoxic phenotype via HIF1A stabilization. Targeting the neurovascular-immune axis may offer promising therapeutic avenues for advanced PD.
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