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C8696 Sigma-Aldrich

Cathepsin D from human liver

lyophilized powder, ≥250 units/mg protein (E1%/280)



General description

Cathepsin D is an aspartic protease, which is located in lysosomes. It is involved in protein catabolism and maintains hormone and antigen processing. Cathepsin D is implicated in neoplasia and neurodegenerative changes. It regulates lysosomal proteolysis and endogenous fibrinolysis.


Cathepsin D from human liver has been used:
• in β-secretase activity assay
• for enzymatic degradation of amyloid β 1-42
• in microinjection of human foreskin fibroblasts

Biochem/physiol Actions

Cathepsin D is an endosomal-lysosomal aspartic protease implicated in breast cancer metastasis and Alzheimer’s disease. Lysosomal release of cathepsin D has been found to precede cytochrome c release and loss of membrane potential in apoptotic human foreskin fibroblasts. Cathepsin D levels in PC12 cells increase 12 to 24 hours after apoptosis is induced.

Other Notes

Contains α, β and γ isoenzymes as observed by isoelectric-focusing.

Unit Definition

One unit will produce an increase in A280 of 1.0 in 30 min at pH 3.3 at 37 °C measured as TCA-soluble products using acid-denatured hemoglobin as substrate (1 cm light path).

Physical form

Powder containing sodium phosphate buffer salt.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles

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