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  • C266 - Monoclonal Anti-μ-Calpain (Domain III) antibody produced in mouse

C266 Sigma

Monoclonal Anti-μ-Calpain (Domain III) antibody produced in mouse

clone 9A4H8D3, ascites fluid, buffered aqueous solution


Related Categories Alphabetical Index, Antibodies, Antibodies for Cell Biology, Antibodies for Intracellular Calcium Signaling, Antibodies to Calcium-Associated Proteins,
species reactivity   bovine, rat, human, pig
application(s)   indirect immunofluorescence: 1:100
  western blot: 1:2,000
clone   9A4H8D3, monoclonal
antibody form   ascites fluid
form   buffered aqueous solution
isotype   IgG1
mol wt   antigen mol wt 80 kDa
shipped in   dry ice
storage temp.   −20°C
Gene Information   human ... CAPN1(823)
rat ... Capn1(29153)
biological source   mouse
conjugate   unconjugated



μ-calpain from bovine skeletal muscle.

General description

Calpain-1 catalytic subunit is a protein encoded by the CAPN1 gene in humans. Calpains are calcium dependent proteases constituting a family of proteins. They share a homologous cysteine-protease domain and an E-F hand Ca2+-binding domain. The calpain system consists of two ubiquitous forms of calpain (m-calpain and μ-calpain), a tissue specific calpain (n-calpain) and a calpain inhibitory protein (calpastatin).

Physical form

Solution in phosphate buffered saline and contains 0.05% sodium azide.


Epitope mapping studies indicate the epitope is between amino acids 465-520 (domain III) of human μ-calpain. The antibody reacts specifically with μ-calpain. It does not cross-react with m-calpain, n-calpain, calmodulin or calpastatin. It is not recommended for immunoprecipitation. By immunoblotting, reactivity is observed with human platelets and erythrocytes, bovine platelets, heart and skeletal muscle and with rat myoblasts, kidney, liver and spleen. By immunofluorescence on pig LLC-PK1 cells, diffuse cytoplasmic staining is observed.


Monoclonal Anti-μ-Calpain (Domain III) antibody produced in mouse is suitable for indirect immunofluorescence at a dilution of 1:100 and western blotting at a dilution of 1:2,000.

Biochem/physiol Actions

Calpain is involved in calmodulin-independent pathway for the activation of calcineurin. Endogenous calpain I forms active calcineurin in the human heart by proteolysis of calcineurin A, which may lead to pathogenesis of myocardial disease. μ-calpain, on overexpression, may have relationship with intractable epilepsy as well as the clinicopathological characteristics. The activity of this protein is elevated in skeletal muscle from gastric cancer patients.

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