Target intelligence / Profile preview

Calpain

Molecular classification
Enzyme, Cysteine protease
01

Overview

Calpains are a family of intracellular, calcium-dependent, non-lysosomal cysteine proteases. They are ubiquitously expressed in mammals and many other organisms, playing key roles in various cellular processes by mediating limited proteolysis of specific substrates. The calpain system includes the calpain proteases themselves, a small regulatory subunit (CAPNS1/CAPN4), and an endogenous inhibitor called calpastatin. Dysregulation or overactivation has been implicated as an aggravating factor in various diseases including neurodegeneration after trauma/stroke/myocardial infarction due to excessive substrate cleavage following abnormal increases in intracellular Ca²⁺ levels.

Other names
Calcium-activated neutral proteaseCANPμ-Calpainm-CalpainCalpain ICalpain II
02

Mechanism of action

Calpain inhibitors (being developed) aim to reduce excessive proteolysis following calcium dysregulation.

03

Biological functions

Cytoskeleton remodelingSignal transductionApoptosisCell cycle control
04

Disease associations

Neurodegenerative diseaseCardiovascular diseaseStrokeIschemiaMyocardial infarction
05

Safety considerations

Potential for off-target effects due to broad substrate specificity.Inhibition of calpain activity may have unintended consequences on normal cellular function.

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