Calpain is an evolutionary old family of soluble, neutral, calcium-dependent proteases, which have the unique property of using protein cleavage to modify the activity/function of their substrate proteins. There are two major calpain isoforms in the brain, calpain-1 and calpain-2. Calpain-1 and Calpain-2 exhibit opposite functions in both synaptic plasticity and neurodegeneration. Calpain-1 activation is required for the induction of long-term potentiation (LTP) and is generally neuroprotective, while calpain-2 activation lim...
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