Receptor-Specific ER-Phagy in Neurodegenerative Diseases: Molecular Mechanisms and Emerging Therapeutic Opportunities.

Neurodegenerative diseases (NDs) constitute a major global health burden driven by rising life expectancy and the lack of disease-modifying therapies. Central to these progressive pathologies is the accumulation and aggregation of conformationally altered proteins, categorizing them as 'proteinopathies'. These aberrant aggregates disrupt cellular homeostasis and trigger chronic stress responses that drive progressive neuronal dysfunction and loss. The endoplasmic reticulum (ER) is a dynamic organelle defined by remarkable structural diversity and functional plasticity, that preserves cellular homeostasis by orchestrating protein folding and quality control, lipid biosynthesis, calcium sequestration and metabolic detoxification. However, sustained ER stress and functional dysregulation are increasingly implicated in neurodegenerative cascades. In this context, ER-selective autophagy (ER-phagy) has emerged as an indispensable quality-control pathway. Mediated by dedicated ER-phagy receptors that target distinct subdomains for lysosomal clearance, this pathway preserves organellar integrity and mitigates proteotoxic burden in post-mitotic neurons. Nonetheless, the full mechanistic landscape of ER-phagy remains poorly defined, with receptor-specific functions, regulatory signalling networks and CNS expression profiles only beginning to be resolved. This review synthesizes current insights into ER-phagy in neurodegeneration, dissects receptor-specific mechanisms, and highlights emerging pharmacological interventions. Ultimately, the therapeutic potential of modulating receptor-specific ER-phagy as an untapped strategy to resolve ER stress, re-establish neuronal proteostasis and to combat neurodegenerative conditions is highlighted.