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Mitochondria increasingly attract attention as control points within the mechanisms of neuronal death. Mitochondria play a central role in swinging the balance in favor of either survival or death of brain tissue. Cell death in vertebrates proceeds mostly via the mitochondrial pathway of apoptosis. Permeability transition pore (PTP) development in mitochondria is a decisive stage of apoptosis. Therefore, regulation of the permeability of both outer and inner mitochondrial membranes helps to induce neuroprotection. Through PTP control, mitochondria can to a large degree manage the intracellular calcium homeostasis, and thus control the potent death cascade initiated by excess calcium. Here we summarize the evidence for the role of mitochondria in brain cell death. We describe the involvement of the 18-kDa translocator protein (TSPO; previously called peripheral benzodiazepine receptor), and of two new mitochondrial proteins, that is, 2′,3′-cyclic nucleotide 3′-phosphodiesterase (CNP) and p42 IP4  (also designated centaurin α1; ADAP 1), in the control of the PTP. Furthermore, ligands of TSPO, as well as substrates of CNP, are possible modulators of PTP function. This scenario of control and regulation of PTP function might provide multiple important targets, which are suitable for developing protective strategies for neurons and non-neuronal brain cells in therapies of neurodegenerative diseases.

biological chemistry

The mitochondria permeability transition pore complex in the brain with interacting proteins – promising targets for protection in neurodegenerative diseases