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. 1986 Jun;22(2):139–143. doi: 10.1007/BF00199128

Autoradiographic analysis of monoclonal antibody distribution in human colon and breast tumor xenografts

Peter L Jones 1,✉, Brian M Gallagher 1, Howard Sands 1
PMCID: PMC11038496  PMID: 3719593

Abstract

The targeting of monoclonal antibodies to human tumor xenografts in nude mice was investigated by analysis of the cellular distribution of two radioiodinated monoclonal antibodies, B6.2 and B72.3, which recognize different tumor-associated antigens. The time course of distribution of each antibody within Clouser human mammary carcinoma (B6.2 positive, B72.3 negative) and LS174T human colorectal carcinoma (B6.2 positive, B72.3 positive) following i. v. injections was compared using autoradiographic techniques, which were also used to determine the pattern of binding after in vitro incubation with radiolabeled antibody. Both in vivo and in vitro localization of 125I-B72.3 in LS174T were characterized by the binding of antibody to antigen-rich mucin globules. In contrast, in vivo localization of B6.2 was restricted to groups of cells in well vascularized regions. Thus, the in vivo accumulations of B6.2 and B72.3 although quantitatively similar showed very different spatial distributions within LS174T tumors. The in vivo binding of B6.2 in Clouser tumors was restricted to small clusters of cells scattered fairly evenly throughout the tumor. There was no evidence for the presence of such antigen-rich foci after in vitro incubation of tumor sections with B6.2 suggesting that heterogeneity of regional uptake may be due to differences in antibody delivery. This type of information may provide a rational basis for the selection of appropriate therapeutic isotopes for radioimmunotherapy studies using these and other tumor models.

Keywords: Nude Mouse, Colorectal Carcinoma, Human Colon, Tumor Xenograft, Mammary Carcinoma

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