Potential Role of Membrane Contact Sites in the Dysregulation of the Crosstalk Between Mitochondria and Lysosomes in Alzheimer's Disease.

Alzheimer's disease (AD) is a neurodegenerative disorder characterized by a gradual decline in cognitive abilities and a progressive loss of the neuronal system resulting from neuronal damage and death. The maintenance of neuronal homeostasis is intricately connected to the crosstalk and balance among organelles. Indeed, intracellular organelles are not just isolated compartments in the cell; instead, they are interdependent structures that can communicate through membrane contact sites (MCSs), forming physical connection points represented by proteinaceous tethers. Mitochondria and lysosomes have fundamental physiological functions within neurons, and accumulating evidence highlights their dysfunctions as AD features, strongly associated with the neurodegenerative process underlying the development and progression of AD. This review explores mitochondria-lysosome communication through MCSs, the tethering proteins and their functions in the cell, discussing the methodological challenges in measuring the structure and dynamics of contacts, and the potential role of altered mitochondria-lysosome communication in the context of organelle dysfunction related to neuron impairment in AD pathogenesis. The different abundance of the tethering proteins was considered in healthy physiological and in AD-related conditions to assess the possible organelle communication dysregulation and the subsequent cellular function alterations, and to evaluate the role of mitochondria-lysosome MCSs in the pathogenesis of this disorder.