Cripto-1 Human Active Protein

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
Recent work has shown that other TGF- 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

Small volumes of Cripto-1 active protein vial(s) may occasionally become entrapped in the seal of the product vial during shipment and storage. If necessary, briefly centrifuge the vial on a tabletop centrifuge to dislodge any liquid in the container`s cap. Certain products may require to ship with dry ice and additional dry ice fee may apply.

MBS650477 is an active protein targeting Cripto-1. Also known as Cripto-1, Recombinant, Human (Epidermal Growth Factor-Like Cripto Protein CR1, TDGF-1, Teratocarcinoma-Derived Growth Factor 1, CFC-2). Reactive in Human.