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Minocycline is broadly protective in neurologic disease models featuring cell death and is being evaluated in clinical trials. We previously demonstrated that minocycline-mediated protection against caspase-dependent cell death related to its ability to prevent mitochondrial cytochrome c release. These results do not explain whether or how minocycline protects against caspase-independent cell death. Furthermore, there is no information on whether Smac/Diablo or apoptosis-inducing factor might play a role in chronic neurodegeneration. In a striatal cell model of Huntington's disease and in R6/2 mice, we demonstrate the association of cell death/disease progression with the recruitment of mitochondrial caspase-independent (apoptosis-inducing factor) and caspase-dependent (Smac/Diablo and cytochrome c) triggers. We show that minocycline is a drug that directly inhibits both caspase-independent and -dependent mitochondrial cell death pathways. Furthermore, this report demonstrates recruitment of Smac/Diablo and apoptosis-inducing factor in chronic neurodegeneration. Our results further delineate the mechanism by which minocycline mediates its remarkably broad neuroprotective effects.

Minocycline inhibits caspase-independent and -dependent mitochondrial cell death pathways in models of Huntington's disease