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American Journal of Pathology, Vol 144, 747-755, Copyright © 1994 by American Society for Investigative Pathology
REGULAR ARTICLES |
K Sonouchi, TA Hamilton, CS Tannenbaum, RR Tubbs, R Bukowski and JH Finke
Department of Immunology, Cleveland Clinic Foundation, OH 46195.
The expression of three chemoattractant cytokine (chemokine) messenger (m)RNAs in the murine renal cell carcinoma (RENCA) from mice treated with a combination of interferon-alpha (IFN-alpha) and interleukin-2 was examined and related to tumor infiltration by inflammatory leukocytes. Using a semi-quantitative reverse transcriptase polymerase chain reaction assay, mRNAs encoding the KC, JE, and IP-10 genes were all elevated in tumor tissue from mice treated systemically with IFN- alpha/interleukin-2 for 4 days. Similarly, the mRNA for tumor necrosis factor-alpha (TNF-alpha) was also increased in tumors from treated as compared to control animals. The same tumors showed a significant increase in Mac-1+ leukocytes, which correlated well with the increase in chemokine and TNF-alpha gene expression. The renal cell carcinoma tumor itself may be responsible for the expression of chemokine genes in the tumor bed following cytokine therapy. Cultures of freshly explanted RENCA cells expressed significant levels of chemokine mRNAs when stimulated in vitro with IFN alpha, IFN gamma, and/or interleukin- 2, demonstrating that this tumor cell has potential for expression of these genes in vivo. In contrast, TNF-alpha expression was not detected in cultured tumor cells. Thus TNF-alpha may be expressed by infiltrating monocytes following exposure to recombinant cytokine therapy.
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