Human Cripto-1 Biotinylated Antibody

Catalog #: BAF145 Datasheet / COA / SDS

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BAF145

All Cripto Antibodies

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Human Cripto-1 Biotinylated Antibody Summary

Species Reactivity

Human

Specificity

Detects human Cripto-1 in Western blots.

Source

Polyclonal Goat IgG

Purification

Antigen Affinity-purified

Immunogen

E. coli-derived recombinant human Cripto-1
Arg38-Tyr188
Accession # P13385

Formulation

Lyophilized from a 0.2 μm filtered solution in PBS with BSA as a carrier protein.

Label

Biotin

Applications

Recommended Concentration

Sample

Western Blot

0.1 µg/mL

Recombinant Human Cripto-1 (Catalog # 145-CR)

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

Reconstitution Calculator

Preparation and Storage

Reconstitution

Reconstitute at 0.2 mg/mL in sterile PBS.

Shipping

The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.

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: Cripto

Cripto is the founding member of the epidermal growth factor-CriptoFRL1Cryptic (EGF-CFC) family of signaling proteins that function in cancer and various developmental processes. These developmental processes include: formation of the germ layers and dorsal organizer, specification of anterior-posterior and left-right axes, and differentiation of heart muscle (1, 2). Other members of the EGF-CFC family include Cryptic, Xenopus FRL-1 and zebrafish OEP (one-eyed pinhead). Overall sequence identity between members of the family is low, but they do share several common domains: a variant EGF-like motif, a novel conserved cysteine‑rich domain (called CFC domain), and a C-terminal hydrophobic region. Most EGF-CFC members have a glycosyl-phosphatidylinositol (GPI) anchoring site at the C-terminus and exist as extracellular membrane-anchored proteins. However, naturally-occurring soluble isoforms also exist. Human Cripto shares 66% and 28% amino acid identity with mouse Cripto and zebrafish OEP, respectively (2). Despite weak conservation in amino acid identity, EGF-CFC family members appear to function similarly in assays for phenotypic rescue of zebrafish oep mutants (2). Both secreted and membrane bound forms of Cripto demonstrate biological activity (3).

Cripto, also known as CFC-2 or TDGF-1 (teratocarcinoma-derived growth factor), was originally isolated from an undifferentiated human teratocarcinoma cell line as a potential oncogene. It is overexpressed in many types of cancers and acts as a growth factor for tumors (4). Genetic evidence from mice and zebrafish points to a role for Cripto as an essential cofactor in Nodal signaling. Cripto and OEP mutants display defects in mesoderm induction and heart morphogenesis, similar to phenotypes seen in Nodal mutants (2).

Cripto acts as a cofactor for Nodal by recruiting the Activin type I Receptor, ALK-4, leading to an Act RIIB-ALK4-Cripto-Nodal complex for signaling (1, 3). Cripto also forms a complex with activin and Act RIIs to block activin signaling (5). Studies have shown that other TGF-beta superfamily members such as Vg1 and GDF-1 also require EGF-CFC cofactors (6). Cripto can also activate mitogen-activated protein kinase (MAPK) and Akt pathways independently of Nodal by directly binding to a membrane-associated heparan sulfate proteoglycan, glypican-1 (7).

References

Rosa, F.M. (2002) Science’s STKE http://stke.sciencemag.org/.
Shen, M. and A. Schier (2000) Trends Genet. 16:303.
Yan, Y-T. et al. (2002) Mol. Cell Biol. 22:4439.
Salomon, D. et al. (2000) Endocrine-Rel. Cancer 7:199.
Gray, P.C. et al. (2003) Proc. Natl. Acad. Sci. USA 100:5193.
Cheng, S. et al. (2003) Genes & Dev. 17:31.
Bianco, C. et al. (2003) Cancer Research 63:1192.

Long Name

Teratocarcinoma-derived Growth Factor/Cripto Growth Factor

Entrez Gene IDs

6997 (Human); 21667 (Mouse)

Alternate Names

CFC-2; CR; Cripto; Cripto-1 growth factor; Cripto-1; CRIPTOCRGF; Epidermal growth factor-like cripto protein CR1; TDGF1; TDGF-1; teratocarcinoma-derived growth factor 1