Cathepsin D (Tumor Marker) [CTSD/3276]



Cathepsin D is a ubiquitously expressed lysosomal aspartyl protease involved in the normal degradation of proteins. It is synthesized as an inactive 52kDa preprocathepsin D that is cleaved and glycosylated to form a 48kDa procathepsin D and then further cleaved to produce 34kDa and 14kDa subunits (heavy and light chains, respectively). Cathepsin D exhibits pepsin-like activity and plays a role in protein turnover and in the proteolytic activation of hormones and growth factors. Mutations in this gene play a causal role in neuronal ceroid lipofuscinosis-10 and may be involved in the pathogenesis of several other diseases, including breast cancer and possibly Alzheimer's disease.

Product Properties & Targets

Species Reactivity
Cellular Localization
Extracellular space, Lysosome, Melanosome, Secreted
Light Chain
Gene Name
Positive Control
K-562 or SK-BR3 cells. Human kidney, Liver, lung or breast tissue., MCF-7
Recombinant fragment of human Cathepsin D protein (around aa 104-250) (exact sequence is proprietary)
Alternate Names
Cathepsin D, CatD; Cathepsin D; Ceroid lipofuscinosis neuronal 10; CLN10; CPSD; Epididymis secretory sperm binding protein Li 130P; Lysosomal aspartyl peptidase; Lysosomal aspartyl protease

Database Links

Entrez Gene ID

Additional Information

Human Gene Symbol
Chromosome Location
Mol. Weight of Antigen
48kDa (Procathepsin D); 34kDa (Cathepsin D); 14kDa (Cathepsin D)


  • Acid protease active in intracellular protein breakdown. Plays a role in APP processing following cleavage and activation by ADAM30 which leads to APP degradation (PubMed:27333034). Involved in the pathogenesis of several diseases such as breast cancer and possibly Alzheimer disease.

Known Applications & Suggested Dilutions

  • Immunofluorescence (1-2ug/ml)
  • Western Blot (1-2ug/ml)
  • Immunohistochemistry (Formalin-fixed) (1-2ug/ml for 30 minutes at RT) (Staining of formalin-fixed tissues requires heating tissue sections in 10mM Tris with 1mM EDTA, pH 9.0, for 45 min at 95&degC followed by cooling at RT for 20 minutes)
  • Optimal dilution for a specific application should be determined.

Key References

  • Nomura T, et al. J Med Invest. 2005 Feb;52(1-2):1-9.

Storage & Stability

Antibody with azide - store at 2 to 8°C. Antibody without azide - store at -20 to -80°C. Antibody is stable for 24 months. Non-hazardous. No MSDS required.


This antibody is available for research use only and is not approved for use in diagnosis.

Supplied as

200ug/ml of Ab Purified from Bioreactor Concentrate by Protein A/G. Prepared in 10mM PBS with 0.05% BSA & 0.05% azide. Also available WITHOUT BSA & azide at 1.0mg/ml.


There are no warranties, expressed or implied, which extend beyond this description. Company is not liable for any personal injury or economic loss resulting from this product.


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