Expression of minichromosome maintenance-2 in human malignant fibrous histiocytomas: Correlations with Ki-67 and P53 expression, and apoptosis.
This study examined the clinicopathological significance of minichromosome maintenance-2 (MCM2) expression in 38 human malignant fibrous histiocytomas (MFHs) and 36 benign fibrohistiocytic tumors (BFHTs) immunohistochemically, and in 9 human sarcoma or carcinoma cell lines, as well as 7 surgical specimens by Western blotting. MCM2 was detected in all the cell lines and surgical specimens as a single band at 120 kDa, while P53 expression was variable. Nuclear expression of MCM2 was noted in tumor but not mitotic cells of all the MFHs and 26 (72.2%) of the BFHTs, the labeling indices (LIs) being 62.0% in the 28 ordinary types, 38.5% in the 10 myxoid types, and 11.2% in the BFHTs with significant difference. Moreover, the LI was significantly higher for MCM2 than that for Ki-67 in the MFHs of both types (p<0.05). No correlation was noted between the MCM2-LI and P53 expression or apoptotic indices, which were significantly higher in the MFHs than BFHTs (p<0.01). These results indicate that MCM2 would correlate with cell proliferation rather than apoptosis in MFHs, and the expression is ubiquitous in proliferating cells, regardless of the expression of P53. Thus, MCM2 might be a reliable marker of proliferating cells in human MFH.
Osaki
Mari
M
Division of Organ Pathology, Department of Microbiology and Pathology, School of Health Science, Faculty of Medicine, Tottori University, Tottori, Japan.
Osaki
Mitsuhiko
M
Yamashita
Hideki
H
Shomori
Kohei
K
Yoshida
Haruhiko
H
Ito
Hisao
H
D017209:Apoptosis / Q000235:genetics; D015415:Biomarkers; D015153:Blotting, Western; D002455:Cell Division / Q000235:genetics; D018572:Disease-Free Survival; D015972:Gene Expression Regulation, Neoplastic; D016158:Genes, p53; D006367:HeLa Cells / Q000378:metabolism; D018219:Histiocytoma, Benign Fibrous / Q000235:genetics / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D006801:Humans; D019394:Ki-67 Antigen / Q000096:biosynthesis* / Q000235:genetics; D015993:Life Tables; D064111:Minichromosome Maintenance Complex Component 2; D009363:Neoplasm Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000502:physiology; D009687:Nuclear Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000502:physiology; D011379:Prognosis; D012509:Sarcoma / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D016019:Survival Analysis; D014407:Tumor Cells, Cultured / Q000378:metabolism; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis*
D015415:Biomarkers; D019394:Ki-67 Antigen; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D016159:Tumor Suppressor Protein p53; D064111:Minichromosome Maintenance Complex Component 2