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The high mobility group box 1 (HMGB1) protein is an abundant non-histone component of chromatin well known for its two DNA binding domains, HMG box A and HMG box B. The main characteristics of the HMGB1 protein as an 'architectural' factor are its ability to recognize and bind with high affinity to distorted DNA and its ability to induce kinks in linear DNA fragments. The HMGB1 protein has been correlated to cancer progression. An elevated expression of HMGB1 occurred in certain types of primary tumor, including melanoma and colon, prostate, pancreatic and breast cancers, and in the majority of cases HMGB1 is associated with invasion and metastasis. The main signaling pathway is activated through the interaction of HMGB1 with its Receptor for Advanced Glycation End products (RAGE). Certain data indicate that an elevated expression of RAGE and HMGB1 is not always a prerequisite of poor prognosis of tumor development. The cellular localization of the ligand/receptor pair also requires consideration. The data concerning the expression of HMGB1 protein and its receptor RAGE in various tissues and tumor cells reflect the overall production of the proteins. However, they do not refer to their cellular localization and there is no direct evidence for the formation of a stable complex between them. In the present study, we investigated the subcellular distribution of HMGB1 and its receptor RAGE in various rat organs compared to Guerin ascites tumor cells. In the normal tissues the proteins exist in their soluble form, whereas in the tumor cells they are insoluble and membrane-bound. HMGB1 forms a stable complex with RAGE only in the protein extract derived from the cancer cells predominantly in the membrane fraction.

High mobility group B1 protein interacts with its receptor RAGE in tumor cells but not in normal tissues