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HMGB1 and HMGB2 Expression Patterns in Human Papillary Renal Cancers

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DOI: 10.4236/oju.2013.31005    3,409 Downloads   5,327 Views  


High mobility group box (HMGB) proteins are nuclear nonhistone chromosomal proteins that bend DNA, bind preferentially to distorted DNA structures, and promote the assembly of site-specific DNA binding proteins. Recent reports indicate that HMGB1 has a dual function, a cytokine in addition to a nuclear protein. The increased expression of HMGB1 has been reported for several different tumors. Here, we assessed HMGB1 and HMGB2 expressions in two cases of papillary renal cell carcinoma. One case with pT1a, Grade 2 showed HMGB1 expression in the nucleus and cytosol and HMGB2 expression in the nucleus, but not in the cytosol. In the other case, there were three renal tumors, one of which was clear cell renal cell carcinoma with pT1a, Grade 3 and two were papillary renal cell carcinomas, Grade 2 (5 mmand2 mmin the diameter). Both HMGB1 and HMGB2 were expressed in the nucleus and cytosol of papillary carcinoma. In the clear cell carcinoma of this case, HMGB1 expression was stained both in the nucleus and cytosol, while HMGB2 was observed in the nucleus, but not in the cytosol. More samples need to be further investigated in order to draw conclusions concerning HMGB expressions in papillary renal cell carcinomas.

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The authors declare no conflicts of interest.

Cite this paper

T. Takeuchi, K. Sakazume, A. Tonooka, M. Hattori, M. Zaitsu, Y. Takeshima, K. Mikami and T. Uekusa, "HMGB1 and HMGB2 Expression Patterns in Human Papillary Renal Cancers," Open Journal of Urology, Vol. 3 No. 1, 2013, pp. 28-31. doi: 10.4236/oju.2013.31005.


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