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Receptor Sites for Antigen-Antibody Complexes on Cells Derived from Solid Tumors: Detection by Means of Antibody Sensitized Sheep Erythrocytes Labeled with Technetium-99m

Gary W. Wood, G. Yancey Gillespie and Rolf F. Barth
J Immunol March 1, 1975, 114 (3) 950-957;
Gary W. Wood
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G. Yancey Gillespie
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Rolf F. Barth
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Abstract

Surface receptor sites for the Fc portion of antigen-antibody complexes were demonstrated on cells derived from three methylcholanthrene-induced fibrosarcomas, one of strain C3H and two of strain BALB/c origin, two spontaneously occurring malignant melanomas (B16 in strain C57BL/6 and Harding-Passey in strain BALB/c mice), a Moloney sarcoma virus-induced tumor of strain BALB/c origin and the Walker 256 carcinosarcoma of Holtzman rats. Primary cell cultures derived from these tumors adsorbed technetium-99m labeled, antibody-sensitized sheep erythrocytes (99mTc EA) as determined either by visual scoring of adherence or radioisotopic quantitation. Depending upon the tumor tested, from 20% to greater than 95% of the target cells absorbed 99mTc EA. All cells lost their reactivity after 1 or 2 passages in vitro, but this was regained after a single passage in vivo. Indicator erythrocytes coated with F(ab′)2 fragments of the sensitizing sheep erythrocytes (SRBC) antiserum did not adhere thereby demonstrating that the hemadsorption required an intact Fc portion of the antibody molecule. Adherence of 99mTc EA was blocked by soluble immune complexes prepared with ovalbumin and rabbit antibody directed against it and Escherichia coli 055:B5 lipopolysaccharide and mouse antibody directed against it. Normal rabbit or mouse serum, immune serum, or antigen alone did not block adherence of 99mTc EA thereby demonstrating that the receptors had greater affinity for immune complexes than for either antigen or antibody alone. The existence of membrane receptors on tumorderived cells which react with the Fc portion of antigen-antibody complexes may provide an explanation for the mechanism by which immune complexes are capable of blocking cell-mediated tumor cell destruction irrespective of whether the receptors are on the tumor cells themselves or on admixed lymphocytes and macrophages.

Footnotes

  • ↵1 This investigation was supported by Public Health Service General Research Grants 5SO4 RR 06147 and 5 SO1 RR 5373, CA 13190 from the National Cancer Institute.

  • Received September 10, 1974.
  • Copyright © 1975 by The American Association of Immunologists, Inc.

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The Journal of Immunology
Vol. 114, Issue 3
1 Mar 1975
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Receptor Sites for Antigen-Antibody Complexes on Cells Derived from Solid Tumors: Detection by Means of Antibody Sensitized Sheep Erythrocytes Labeled with Technetium-99m
Gary W. Wood, G. Yancey Gillespie, Rolf F. Barth
The Journal of Immunology March 1, 1975, 114 (3) 950-957;

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Receptor Sites for Antigen-Antibody Complexes on Cells Derived from Solid Tumors: Detection by Means of Antibody Sensitized Sheep Erythrocytes Labeled with Technetium-99m
Gary W. Wood, G. Yancey Gillespie, Rolf F. Barth
The Journal of Immunology March 1, 1975, 114 (3) 950-957;
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Print ISSN 0022-1767        Online ISSN 1550-6606