Abstract:
:Clinical and experimental scintigraphic studies have found that radiolabelled antibodies are not only taken up by tumour(s) but also by normal liver. The accumulation of radionuclides in this organ poses a major problem to the use of radiolabelled antibodies as diagnostic and therapeutic tools. In an attempt to understand the mechanism of hepatic uptake and clearance of radiolabelled antibodies, the intrahepatic biodistribution of an 111In-labelled MAb (HMFG1), was determined following i.v. administration to normal male rats. Two hours after administration the liver contained 15% of the injected dose, with most of the remaining radioactivity in the blood. The hepatic burden of the 111In MAb remained constant over the next 72 hr in the face of decreasing blood levels of radioactivity as well as its urinary and faecal excretion. At 2 and 72 hr after injection, 50% and 10% respectively of the hepatic radiolabel was due to blood borne antibody. Following a collagenase-cell isolation procedure, only 23% of the amount remaining in the liver at 2 hr was found to be cell-associated; 66% was lost during the cell isolation and purification procedure. Cellular uptake increased with time so that, by 72 hr after administration, 58% was cell-associated and 29% freely removable. At all timepoints, the parenchymal cells contained more activity than non-parenchymal cells. No evidence of antibody-receptor interactions could be obtained either in vivo or in cultures of hepatic parenchymal and non-parenchymal cells. Our data suggest that the bulk of the hepatic burden of 111In MAb results from extravascular pooling of the antibody.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Boyle CC,Paine AJ,Mather SJdoi
10.1002/ijc.2910500616keywords:
subject
Has Abstractpub_date
1992-04-01 00:00:00pages
912-7issue
6eissn
0020-7136issn
1097-0215journal_volume
50pub_type
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