Human high molecular weight-melanoma associated antigen mimicry by an anti-idiotypic antibody: characterization of the immunogenicity and the immune response to the mouse monoclonal antibody IMel-1.
The mouse anti-idiotype (anti-id) monoclonal antibody (mAb) IMel-1 recognizes an idiotope in the antigen combining site of the immunizing anti-human high molecular weight melanoma-associated antigen (HMW-MAA) mAb 225.28. The mAb IMel-1 is able to induce an immune response against self cross-reacting HMW-MAA in rabbits that express HMW-MAA in normal tissues. Most of the rabbit anti-anti-id antibodies recognize a spatially distant determinant(s) from that defined by anti-HMW-MAA mAb 225.28. The immunogenicity of mAb IMel-1 is enhanced by its administration with the muramyl dipeptide-derived adjuvant. Anti-HMW-MAA antibodies were not detected in sera from rabbits immunized with HMW-MAA bearing cultured human melanoma cells. The differential immunogenicity of mAb IMel-1 and cell membrane bound HMW-MAA may account for the ability of anti-id mAb to induce anti-HMW-MAA immunity in patients who have not mounted such a response to HMW-MAA present in their lesions. Rabbit anti-HMW-MAA antibodies induced by anti-id mAb IMel-1 inhibited interactions of melanoma cells with elements of extracellular matrix. This may represent an additional mechanism by which anti-HMW-MAA immunity may affect the biology of melanoma cells in patients with melanoma immunized with anti-id mAb IMel-1.
Chattopadhyay
P
P
IDEC Pharmaceuticals Corp., La Jolla, California 92037.
Kaveri
S V
SV
Byars
N
N
Starkey
J
J
Ferrone
S
S
Raychaudhuri
S
S
D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000276:immunology*; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000951:Antigens, Neoplasm / Q000276:immunology*; D006801:Humans; D007114:Immunization; D008545:Melanoma / Q000276:immunology*; D058950:Melanoma-Specific Antigens; D008970:Molecular Weight; D009363:Neoplasm Proteins / Q000276:immunology*; D011817:Rabbits
D000888:Antibodies, Anti-Idiotypic; D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D058950:Melanoma-Specific Antigens; D009363:Neoplasm Proteins