Epitope blocking

Positive and negative effects on the biodistribution of 125I-Labeled anti-tac disulfide-stabilized Fv fragment of two antibodies against different epitopes of the circulating antigen

Hisataka Kobayashi, Bao Fu Sun, Eui Sik Han, Meyoung-Kon Kim, Nhat Le, Qing Cheng Wang, David L. Nelson, Ira Pastan, Thomas A. Waldmann, Chang H. Paik, Jorge A. Carrasquillo

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Prior in vivo studies using the 125I-labeled anti-Tac disulfide-stabilized variable region fragment (125I-anti-Tac dsFv) of monoclonal antibody in the presence of the circulating soluble alpha subunit of the interleukin-2 receptor (sIL-2Rα) have shown formation of complexes which interfere with biodistribution. In this study we evaluated the effects of preinjecting HuTac and 7G7/B6, two immunoglobulin Gs (IgGs) that recognize different epitopes of sIL-2Rα, on the biodistribution of 125I-anti-Tac dsFv in mice bearing SP2/Tac tumor xenografts, which produce sIL-2Rα, or on nude mice injected with 500 ng of sIL-2Rα. We also evaluated the biodistribution in mice of 125I-labelcd sIL-2Rα injected alone or with HuTac and 7G7/B6. Injection of either HuTac or 7G7/B6 resulted in complexes with the sIL-2Rα in serum. Injection of HuTac before 125I-anti-Tac dsFv, in SP2/Tac tumor-bearing mice, resulted in faster clearance of the dsFv from the blood (7.6% ID/g at 30 min), compared to 23.2% ID/g for the no-antibody control; preinjection of 7G7/B6 prolonged the retention of 125I-anti-Tac dsFv to 35.3%ID/g, with more complexes in serum. In mice pre-injected with 7G7/B6 the concentration of 125I-anti-Tac dsFv in tumor was lower (5.2 ± 0.3% ID/g) than in mice preinjected with HuTac (7.9 ± 1.2% ID/g) or in the control group (5.6 ± 0.7% ID/g). In conclusion, while both IgGs formed complexes with sIL-2Rα and prolonged its retention, preinjection of 7G7/B6 was detrimental, because the increased circulating sIL-2Rα still had the epitope recognized by the dsFv available for binding and neutralized the anti-Tac dsFv upon injection, whereas preinjection of HuTac blocked the epitope.

Original languageEnglish
Pages (from-to)436-444
Number of pages9
JournalJapanese Journal of Cancer Research
Volume89
Issue number4
DOIs
Publication statusPublished - 1998 Jan 1
Externally publishedYes

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Immunoglobulin Variable Region
Interleukin-2 Receptors
Disulfides
Epitopes
Antigens
Injections
Immunoglobulins
Interleukin-2 Receptor alpha Subunit
Neoplasms
Serum
Heterografts
Nude Mice
Monoclonal Antibodies
Control Groups
Antibodies

Keywords

  • Epitope
  • Fv fragment
  • Iodine-125
  • Monoclonal antibody
  • Radioimmunodetection

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

Cite this

Epitope blocking : Positive and negative effects on the biodistribution of 125I-Labeled anti-tac disulfide-stabilized Fv fragment of two antibodies against different epitopes of the circulating antigen. / Kobayashi, Hisataka; Sun, Bao Fu; Han, Eui Sik; Kim, Meyoung-Kon; Le, Nhat; Wang, Qing Cheng; Nelson, David L.; Pastan, Ira; Waldmann, Thomas A.; Paik, Chang H.; Carrasquillo, Jorge A.

In: Japanese Journal of Cancer Research, Vol. 89, No. 4, 01.01.1998, p. 436-444.

Research output: Contribution to journalArticle

Kobayashi, Hisataka ; Sun, Bao Fu ; Han, Eui Sik ; Kim, Meyoung-Kon ; Le, Nhat ; Wang, Qing Cheng ; Nelson, David L. ; Pastan, Ira ; Waldmann, Thomas A. ; Paik, Chang H. ; Carrasquillo, Jorge A. / Epitope blocking : Positive and negative effects on the biodistribution of 125I-Labeled anti-tac disulfide-stabilized Fv fragment of two antibodies against different epitopes of the circulating antigen. In: Japanese Journal of Cancer Research. 1998 ; Vol. 89, No. 4. pp. 436-444.
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abstract = "Prior in vivo studies using the 125I-labeled anti-Tac disulfide-stabilized variable region fragment (125I-anti-Tac dsFv) of monoclonal antibody in the presence of the circulating soluble alpha subunit of the interleukin-2 receptor (sIL-2Rα) have shown formation of complexes which interfere with biodistribution. In this study we evaluated the effects of preinjecting HuTac and 7G7/B6, two immunoglobulin Gs (IgGs) that recognize different epitopes of sIL-2Rα, on the biodistribution of 125I-anti-Tac dsFv in mice bearing SP2/Tac tumor xenografts, which produce sIL-2Rα, or on nude mice injected with 500 ng of sIL-2Rα. We also evaluated the biodistribution in mice of 125I-labelcd sIL-2Rα injected alone or with HuTac and 7G7/B6. Injection of either HuTac or 7G7/B6 resulted in complexes with the sIL-2Rα in serum. Injection of HuTac before 125I-anti-Tac dsFv, in SP2/Tac tumor-bearing mice, resulted in faster clearance of the dsFv from the blood (7.6{\%} ID/g at 30 min), compared to 23.2{\%} ID/g for the no-antibody control; preinjection of 7G7/B6 prolonged the retention of 125I-anti-Tac dsFv to 35.3{\%}ID/g, with more complexes in serum. In mice pre-injected with 7G7/B6 the concentration of 125I-anti-Tac dsFv in tumor was lower (5.2 ± 0.3{\%} ID/g) than in mice preinjected with HuTac (7.9 ± 1.2{\%} ID/g) or in the control group (5.6 ± 0.7{\%} ID/g). In conclusion, while both IgGs formed complexes with sIL-2Rα and prolonged its retention, preinjection of 7G7/B6 was detrimental, because the increased circulating sIL-2Rα still had the epitope recognized by the dsFv available for binding and neutralized the anti-Tac dsFv upon injection, whereas preinjection of HuTac blocked the epitope.",
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T2 - Positive and negative effects on the biodistribution of 125I-Labeled anti-tac disulfide-stabilized Fv fragment of two antibodies against different epitopes of the circulating antigen

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AU - Sun, Bao Fu

AU - Han, Eui Sik

AU - Kim, Meyoung-Kon

AU - Le, Nhat

AU - Wang, Qing Cheng

AU - Nelson, David L.

AU - Pastan, Ira

AU - Waldmann, Thomas A.

AU - Paik, Chang H.

AU - Carrasquillo, Jorge A.

PY - 1998/1/1

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N2 - Prior in vivo studies using the 125I-labeled anti-Tac disulfide-stabilized variable region fragment (125I-anti-Tac dsFv) of monoclonal antibody in the presence of the circulating soluble alpha subunit of the interleukin-2 receptor (sIL-2Rα) have shown formation of complexes which interfere with biodistribution. In this study we evaluated the effects of preinjecting HuTac and 7G7/B6, two immunoglobulin Gs (IgGs) that recognize different epitopes of sIL-2Rα, on the biodistribution of 125I-anti-Tac dsFv in mice bearing SP2/Tac tumor xenografts, which produce sIL-2Rα, or on nude mice injected with 500 ng of sIL-2Rα. We also evaluated the biodistribution in mice of 125I-labelcd sIL-2Rα injected alone or with HuTac and 7G7/B6. Injection of either HuTac or 7G7/B6 resulted in complexes with the sIL-2Rα in serum. Injection of HuTac before 125I-anti-Tac dsFv, in SP2/Tac tumor-bearing mice, resulted in faster clearance of the dsFv from the blood (7.6% ID/g at 30 min), compared to 23.2% ID/g for the no-antibody control; preinjection of 7G7/B6 prolonged the retention of 125I-anti-Tac dsFv to 35.3%ID/g, with more complexes in serum. In mice pre-injected with 7G7/B6 the concentration of 125I-anti-Tac dsFv in tumor was lower (5.2 ± 0.3% ID/g) than in mice preinjected with HuTac (7.9 ± 1.2% ID/g) or in the control group (5.6 ± 0.7% ID/g). In conclusion, while both IgGs formed complexes with sIL-2Rα and prolonged its retention, preinjection of 7G7/B6 was detrimental, because the increased circulating sIL-2Rα still had the epitope recognized by the dsFv available for binding and neutralized the anti-Tac dsFv upon injection, whereas preinjection of HuTac blocked the epitope.

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KW - Monoclonal antibody

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