Scintigraphic detection in mice of inflammatory lesions and tumours by an indium-labelled monoclonal antibody directed against Mac-1 antigen
Identifieur interne : 000A02 ( Main/Corpus ); précédent : 000A01; suivant : 000A03Scintigraphic detection in mice of inflammatory lesions and tumours by an indium-labelled monoclonal antibody directed against Mac-1 antigen
Auteurs : RBID : ISTEX:262_1988_Article_BF00199935.pdfAbstract
The monoclonal antibody, 3A33, directed against Mac-1 antigen which is expressed essentially on macrophages and polymorphonuclear cells, was injected i.v. into mice, as part of an attempt to visualize inflammatory lesions and tumours by external scintigraphy. The monoclonal antibody, a rat IgG2a, was conjugated with a bifunctional chelating agent, diethylenetriaminepentaacetic acid at a 1:1 molecular ratio and complexed with 111-indium, a procedure which apparently did not alter its binding to peritoneal macrophages and provided relatively stable cell labelling. An unrelated rat IgG2a of unknown specificity radiolabelled in the same manner as 3A33 served as a control. The uptake of i.v. injected 3A33 by peritoneal macrophages was up to 50 times that of unrelated IgG2a. After i.v. inoculation, the antibody accumulated in the liver, spleen, lung, in foot-pad inflammatory reactions induced by injection of Freund's adjuvant and in experimentally grafted tumours. The 3A33: non-specific IgG2a uptake ratio in inflammatory lesions and tumours, however, was much lower than for peritoneal macrophages and was generally close to 2. This was sufficient to obtain scintigraphic images of inflammations and tumours. The images obtained after injection of 3A33 were clearly of better quality than those given by the non-specific immunoglobulin. They could be improved by subtraction of the vascular images obtained after injection of 99m-technetium serum albumin. The labelling of Mac-1-positive blood mononuclear cells by in vitro incubation with radioactive 3A33 was not intense enough to allow scintigraphic imaging after in vivo re-infusion but seemed more selective than the injection of whole antibody in detecting inflammatory reactions. These results seem interesting in view of the potential human application to the detection inflammatory lesions and the appreciation of tumour inflammatory components. Possible improvements in the technique are discussed.
DOI: 10.1007/BF00199935
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ISTEX:262_1988_Article_BF00199935.pdfLe document en format XML
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<author><name>Brigitte Collet</name>
<affiliation><mods:affiliation>Centre Régional de Lutte contre le Cancer Pontchaillou, F-35033, Rennes-Cedex, France</mods:affiliation>
</affiliation>
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<author><name>Pascal Pellen</name>
<affiliation><mods:affiliation>Centre Régional de Lutte contre le Cancer Pontchaillou, F-35033, Rennes-Cedex, France</mods:affiliation>
</affiliation>
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<author><name>Anne Martin</name>
<affiliation><mods:affiliation>Centre Régional de Lutte contre le Cancer Pontchaillou, F-35033, Rennes-Cedex, France</mods:affiliation>
</affiliation>
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<author><name>Annick Moisan</name>
<affiliation><mods:affiliation>Centre Régional de Lutte contre le Cancer Pontchaillou, F-35033, Rennes-Cedex, France</mods:affiliation>
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<author><name>Dominique Bourel</name>
<affiliation><mods:affiliation>Centre Régional de Transfusion Sanguine de Rennes, F-35033, Rennes, France</mods:affiliation>
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<author><name>Louis Toujas</name>
<affiliation><mods:affiliation>Centre Régional de Lutte contre le Cancer Pontchaillou, F-35033, Rennes-Cedex, France</mods:affiliation>
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<front><div type="abstract" xml:lang="eng">The monoclonal antibody, 3A33, directed against Mac-1 antigen which is expressed essentially on macrophages and polymorphonuclear cells, was injected i.v. into mice, as part of an attempt to visualize inflammatory lesions and tumours by external scintigraphy. The monoclonal antibody, a rat IgG2a, was conjugated with a bifunctional chelating agent, diethylenetriaminepentaacetic acid at a 1:1 molecular ratio and complexed with 111-indium, a procedure which apparently did not alter its binding to peritoneal macrophages and provided relatively stable cell labelling. An unrelated rat IgG2a of unknown specificity radiolabelled in the same manner as 3A33 served as a control. The uptake of i.v. injected 3A33 by peritoneal macrophages was up to 50 times that of unrelated IgG2a. After i.v. inoculation, the antibody accumulated in the liver, spleen, lung, in foot-pad inflammatory reactions induced by injection of Freund's adjuvant and in experimentally grafted tumours. The 3A33: non-specific IgG2a uptake ratio in inflammatory lesions and tumours, however, was much lower than for peritoneal macrophages and was generally close to 2. This was sufficient to obtain scintigraphic images of inflammations and tumours. The images obtained after injection of 3A33 were clearly of better quality than those given by the non-specific immunoglobulin. They could be improved by subtraction of the vascular images obtained after injection of 99m-technetium serum albumin. The labelling of Mac-1-positive blood mononuclear cells by in vitro incubation with radioactive 3A33 was not intense enough to allow scintigraphic imaging after in vivo re-infusion but seemed more selective than the injection of whole antibody in detecting inflammatory reactions. These results seem interesting in view of the potential human application to the detection inflammatory lesions and the appreciation of tumour inflammatory components. Possible improvements in the technique are discussed.</div>
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<abstract lang="eng">The monoclonal antibody, 3A33, directed against Mac-1 antigen which is expressed essentially on macrophages and polymorphonuclear cells, was injected i.v. into mice, as part of an attempt to visualize inflammatory lesions and tumours by external scintigraphy. The monoclonal antibody, a rat IgG2a, was conjugated with a bifunctional chelating agent, diethylenetriaminepentaacetic acid at a 1:1 molecular ratio and complexed with 111-indium, a procedure which apparently did not alter its binding to peritoneal macrophages and provided relatively stable cell labelling. An unrelated rat IgG2a of unknown specificity radiolabelled in the same manner as 3A33 served as a control. The uptake of i.v. injected 3A33 by peritoneal macrophages was up to 50 times that of unrelated IgG2a. After i.v. inoculation, the antibody accumulated in the liver, spleen, lung, in foot-pad inflammatory reactions induced by injection of Freund's adjuvant and in experimentally grafted tumours. The 3A33: non-specific IgG2a uptake ratio in inflammatory lesions and tumours, however, was much lower than for peritoneal macrophages and was generally close to 2. This was sufficient to obtain scintigraphic images of inflammations and tumours. The images obtained after injection of 3A33 were clearly of better quality than those given by the non-specific immunoglobulin. They could be improved by subtraction of the vascular images obtained after injection of 99m-technetium serum albumin. The labelling of Mac-1-positive blood mononuclear cells by in vitro incubation with radioactive 3A33 was not intense enough to allow scintigraphic imaging after in vivo re-infusion but seemed more selective than the injection of whole antibody in detecting inflammatory reactions. These results seem interesting in view of the potential human application to the detection inflammatory lesions and the appreciation of tumour inflammatory components. Possible improvements in the technique are discussed.</abstract>
<relatedItem type="series"><titleInfo type="abbreviated"><title>Cancer Immunol Immunother</title>
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<titleInfo><title>Cancer Immunology, Immunotherapy</title>
<partNumber>Year: 1988</partNumber>
<partNumber>Volume: 26</partNumber>
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<originInfo><dateIssued encoding="w3cdtf">1988-06-01</dateIssued>
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<subject usage="primary"><topic>Biomedicine</topic>
<topic>Cancer Research</topic>
<topic>Immunology</topic>
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<identifier type="issn">Electronic: 1432-0851</identifier>
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