|Budget Amount *help
¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Fiscal Year 2009: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2008: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2007: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Among 20 paired samples, 18 cancer tissues overexpressed miR-21 compared with matched normal epitheliums. Especially, patients with lymph node metastasis or venous invasion showed high expression of miR-21 significantly. All 7 ESCC cell lines also overexpressed miR-21 and anti-miR-21 transfected ESCC cells showed significant reduction in cellular proliferation and invasion. The PDCD4 protein in ESCC cells have inverse correlation with miR-21 expression significantly. Anti-miR-21 transfected ESCC cells increased PDCD4 protein without differences of PDCD4-mRNA and increased a luciferase-reporter activity containing the PDCD4-3'-UTR region. Among 120 ESCC samples, immunohistchmeistry study revealed that patients expressed PDCD4 protein prolonged survival compared with negative. Our results suggest miR-21 plays a pivotal role in progression of ESCC, and it might serve as a novel therapeutic target.