Monoclonal antibody to an intracellular antigen images human melanoma transplants in nu/nu mice.

AUTOR(ES)

Welt, S

RESUMO

Mouse monoclonal antibody TA99 detects a 70-kDa pigmentation-associated glycoprotein in human melanoma cell lines. The antigen cannot be detected on the cell surface by sensitive rosetting techniques or absorption studies, nor can it be detected as a secreted product in culture fluids. Contrary to expectation, 125I-labeled TA99 specifically localized to pigmented human melanoma transplants in nu/nu mice; no localization to nonpigmented melanoma or control tumors was found. Tumor imaging was initially obscured by circulating 125I-labeled TA99 during the first 6 days after antibody injection. With clearance of 125I-labeled TA99 from the blood (half-life, 4-7 days), specific tumor images could be clearly defined by day 13. Due to the persistence of 125I-labeled TA99 at the tumor site (8.9% of the injected dose at 1 week and 4.6% at 8-10 weeks), images were obtainable for up to 10 weeks. At 8-10 weeks, the tumor/blood ratio was 10(4)-10(5), and the tumor/normal tissue ratio ranged from 10(2) to 10(5). In view of these findings, antibodies detecting intracellular antigens may have a role in tumor imaging and therapy.

Documentos Relacionados

• Coxsackievirus B 1-induced polymyositis. Lack of disease expression in nu/nu mice.
• Pattern of polyomavirus replication from infection until tumor formation in the organs of athymic nu/nu mice.
• Mycobacterium lepraemurium infection of nude athymic (nu/nu) mice.
• Interleukin 2 is mitogenic for nu/nu and nu/+ murine spleen cells.
• Thymus differentiation and T-cell specificity in nu/nu +/+ mouse aggregation chimaeras.