Cellular processing in the SW1222 cell line of mAb A33 directly and indirectly radiohalogenated.

Abstract:

:Investigations into the cellular processing of radiolabeled monoclonal antibodies (mAbs) for their further use in radioimmunodiagnosis and cancer therapy are needed in order to understand the fate of internalized and catabolized mAbs. The anti-colorectal cancer mAb, A33, was labelled with 76Br and 125I using the direct Chloramine-T method, or by labelling N-succinimidyl para-(tri-methylstannyl) benzoate and its further conjugation to the mAb. The cellular processing of the four conjugates was investigated in SW1222 cells in vitro. Uptake of mAb was rapid, peaking after 14-16 h. Intracellular degradation was slow and the early loss of radioactivity was due to dissociation of cell-surface bound mAb. The indirect labelling resulted in stronger binding of the mAb as well as prolonged intracellular retention of the radiolabel. Direct and indirect halogen radiolabelling results in different cell-processing patterns of radiolabels, and radioactive catabolic products follow different routes of cellular excretion. The results of this cellular study indicate that indirect labelling is preferable to the direct Chloramine-T method.

journal_name

Oncol Rep

journal_title

Oncology reports

authors

Höglund J,Orlova A,Sundin A,Lundqvist H,Tolmachev V

subject

Has Abstract

pub_date

2006-07-01 00:00:00

pages

159-63

issue

1

eissn

1021-335X

issn

1791-2431

journal_volume

16

pub_type

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