Idiotype of anti-high-molecular-weight melanoma-associated antigen (HMW-MAA) monoclonal antibody 763.74 (Idiotype of mAb 763.74)

The idiotype of the anti-high-molecular-weight melanoma-associated antigen (HMW-MAA) monoclonal antibody 763.74 refers to the unique set of antigenic determinants (idiotopes) located in the variable region of the mouse monoclonal antibody 763.74, which specifically binds to HMW-MAA, also known as CSPG4 (Kusama et al., Cancer Res, 1989). In the context of cancer immunotherapy, this idiotype serves as a structural template for the development of anti-idiotypic antibodies (Ab2), such as MK2-120, which function as "internal images" of the original HMW-MAA tumor antigen (Mittelman et al., J Clin Invest, 1990). When administered as a vaccine, the anti-idiotypic antibody induces a host immune response (Ab3) that cross-reacts with HMW-MAA on melanoma cells (Ferrone et al., Immunol Today, 1995). This strategy is designed to overcome immunological tolerance to the native HMW-MAA protein, which is highly expressed in malignant melanoma and plays a significant role in tumor cell proliferation, migration, and metastasis. Clinical trials have utilized this idiotype-based approach to induce active specific immunity and improve clinical outcomes in patients with advanced melanoma (Mittelman et al., PNAS, 1992).

Other names

HMW-MAA idiotypemAb 763.74 idiotypeCSPG4-related idiotypeAnti-HMW-MAA 763.74 idiotype

Anti-idiotypic vaccination (Ab2 induction of Ab3 response)