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. 1994 Oct;145(4):856–867.

Tumor-derived monocyte chemoattractant protein-1 induces intratumoral infiltration of monocyte-derived macrophage subpopulation in transplanted rat tumors.

S Yamashiro 1, M Takeya 1, T Nishi 1, J Kuratsu 1, T Yoshimura 1, Y Ushio 1, K Takahashi 1
PMCID: PMC1887319  PMID: 7943176

Abstract

By immunohistochemistry using anti-rat macrophage monoclonal antibodies RM-1, ED1, ED2, ED3, TRPM-3, and Ki-M2R, we studied transplanted rat tumors of 9L (rat gliosarcoma), Ad-2 (rat mammary carcinoma), and MT-P (rat malignant fibrous histiocytoma) cell lines to examine the distribution pattern of macrophages within and around the tumors. Most tumor-associated macrophages expressed RM-1, ED1, and Ia antigens, indicating activated macrophages. Based on differences in their immunophenotypical expression, these macrophages were distinguished into two major subpopulations. One expressed TRPM-3 and/or ED3, and the other was positive for ED2 and Ki-M2R. The former was considered to be monocyte-derived macrophages, whereas the latter showed the immunophenotype of tissue-fixed, resident macrophages. Infiltration and distribution patterns in the two macrophage subpopulations differed in the three different tumors. Monocyte-derived, activated macrophages infiltrated into 9L- and Ad-2-transplanted tumors, which markedly produced monocyte chemoattractant protein-1 (MCP-1). Additionally, numerous ED2- and Ki-M2R-positive macrophages were observed within the Ad-2-transplanted tumors, and some of them expressed TRPM-3. However, there were few macrophages in the MT-P-transplanted tumors that showed no MCP-1 production. In transplanted tumors of four MT-P/MCP-1 cell lines established by transfecting a rat MCP-1 gene expression vector (pCEP4/MCP-1) into the MT-P cell line, different levels of MCP-1 production were detected, which correlated well with the numbers of intratumorally infiltrated TRPM-3-positive macrophages. In contrast, ED2- and Ki-M2R-positive macrophages were not detected in any MT-P/MCP-1-transplanted tumors. MT-P/MCP-1-transplanted tumors exhibited lower growth rate than parental MT-P-transplanted tumors. These results indicate that tumor-derived MCP-1 induces intratumoral infiltration of monocyte-derived macrophages, but not macrophages with the immunophenotype of tissue-fixed, resident type. The former population of macrophages seems to have a suppressive effect on the growth of tumors.

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Selected References

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