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Here, we investigate the possible role of Pin1 in rheumatoid arthritis (RA). Pin1 expression was immunohistochemically analyzed in synovial tissue (ST) obtained from patients with RA and osteoarthritis (OA). To investigate Venetoclax concentration the correlation between Pin1 and motility and proliferation of synovial cells, Pin1 localization was immunohistochemically compared with matrix metalloproteinase (MMP)-1, MMP-3, and proliferating cell nuclear antigen (PCNA). Double immunofluorescent staining for Pin1 and p65 was performed to determine whether Pin1 is involved in nuclear factor ��B (NF-��B) activation in RA-ST. Results showed Pin1 expression was significantly higher in RA-ST than in OA-ST. The expression of MMP-1, MMP-3, and PCNA was also significantly elevated in RA-ST. Double immunofluorescent staining revealed colocalization of Pin1 and p65 in the nuclei of RA-ST. These results suggest that Pin1 may be involved in the pathogenesis of RA binding with p65 to Histone demethylase activate the proteins MMP-1, MMP-3, and PCNA. Therefore, Pin1 may play a pivotal role in the pathogenesis of RA. ""Homozygous deletion of 9p21, the locus harboring the p16 gene, has been reported as one of the most common genetic alterations in malignant mesotheliomas (MMs). Previous studies showed that this alteration might be useful for differentiating benign from malignant mesothelial tumors in cytology and surgical specimens. Although the diagnostic utility of 9p21 homozygous deletion by fluorescence in situ hybridization (FISH) analysis has been reported only recently, it has not been well demonstrated. The purpose of this study is to evaluate the diagnostic utility of 9p21 homozygous deletion assessed by FISH in mesothelial neoplasm and hyperplasia of Japanese patients using paraffin-embedded tissue. Simultaneously, p16 protein immunoexpression was explored as a potential diagnostic aid. FISH analysis demonstrated 9p21 deletion in 35 of 40 cases with MM (88%) (P check details in the tumor cells. Our study suggests that 9p21 homozygous deletion assessed by FISH on paraffin-embedded tissue may be very useful for differentiating MM from reactive mesothelial proliferation. ""Tendon consists of highly ordered type I collagen molecules that are grouped together to form subunits of increasing diameter. At each hierarchical level, the type I collagen is interspersed with a predominantly non-collagenous matrix (NCM) (Connect. Tissue Res., 6, 1978, 11).