• Species Reactivity

  Human

• Specificity

  Detects human Cathepsin D in direct ELISAs and Western blots. It recognizes both the pro and mature forms of recombinant human (rh) Cathepsin D. In direct ELISAs, no cross-reactivity with rhCathepsin A, rhCathepsin B, rhCathepsin C, rhCathepsin L, rhCathepsin O, rhCathepsin S, rhCathepsin Z, or recombinant mouse Cathepsin D is observed. In Western blots, 100% cross-reactivity with rhCathepsin E and rmCathepsin D is observed and no cross-reactivity with rhBACE-1 is observed.

• Source

  Monoclonal Mouse IgG    ₁ Clone # 185111

• Purification

  Protein A or G purified from hybridoma culture supernatant

• Immunogen

  Mouse myeloma cell line NS0-derived recombinant human Cathepsin D    
  Leu21-Leu412    
  Accession # P07339

• Formulation

  Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied as a 0.2 µm filtered solution in PBS.

• Label

  Unconjugated

Applications

• Recommended    
  Concentration

  Sample

• Western Blot

  0.2 µg/mL

  See below

• 
  

• Simple Western

  2 µg/mL

  See below

• 
  

• Immunohistochemistry

  5-25 µg/mL

  See below

• 
  

Please Note: Optimal dilutions should be determined by each laboratory for each application.  are available in the Technical Information section on our website.

Data Examples

Preparation and Storage

• Reconstitution

  Reconstitute at 0.5 mg/mL in sterile PBS.

• Shipping

  The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C

• Stability & Storage

  Use a manual defrost freezer and avoid repeated freeze-thaw cycles.    

• 12 months from date of receipt, -20 to -70 °C as supplied.

• 1 month, 2 to 8 °C under sterile conditions after reconstitution.

• 6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: Cathepsin D

Cathepsin D is a lysosomal aspartic protease of the pepsin family (1). Human cathepsin D is synthesized as a precursor protein, consisting of a signal peptide (aa 1‑18), a propeptide (aa 19-64), and a mature chain (aa 65‑412) (2‑4). The mature chain can be processed further to the light (aa 65‑161) and heavy (aa 169‑412) chains. It is expressed in most cells and overexpressed in breast cancer cells (5). It is a major enzyme in protein degradation in lysosomes, and also involved in the presentation of antigenic peptides. Mice deficient in this enzyme showed a progressive atrophy of the intestinal mucosa, a massive destruction of lymphoid organs, and a profound neuronal ceroid lipofucinosis, indicating that cathepsin D is essential for proteolysis of proteins regulating cell growth and tissue homeostasis (6). Cathepsin D secreted from human prostate carcinoma cells are responsible for the generation of angiostatin, a potent endogeneous inhibitor of angiogenesis (6).

• References:

1. Conner et al. in Handbook of Proteolytic Enzymes Barrett (1998) Academic Press, San Diego, p. 828.

2. Faust, et al. (1985) Proc. Natl. Acad. Sci. USA 82:4910.

3. Westley and May (1987) Nucl. Acid Res. 15:3773.

4. Redecker, et al. (1991) DNA Cell Biol. 10:423.

5. Rochefort, et al. (2000) Clin. Chim. Acta. 291:157.

6. Tsukuba, et al. (2000) Mol. Cells 10:601.

• Entrez Gene IDs:

  1509 (Human); 13033 (Mouse)

• Alternate Names:

  cathepsin D (lysosomal aspartyl protease); Cathepsin D; CPSD; CTSD; EC 3.4.23; EC 3.4.23.5; lysosomal aspartyl peptidase; lysosomal aspartyl protease; MGC2311; neuronal 10