RESUMO
Objective To study the clinicopathological significance and biological behavior of human colorectal cancer (CRC) with the expression of angiopoietin-like protein 1 (ANGPTL1).Methods The expression of ANGPTL1 protein in 98 paraffin embedded CRC specimens and paired adjacent non cancerous tissues were detected by immunohistochemistry.The relationship between the protein expression and clinicopathological features was analyzed.Western blot and qRT-PCR were used to examine the expression of ANGPTL1 protein and mRNA levels in 24 paired fresh CRC and adjuvant non-cancerous tissues.Finally,ANGPTL1 expression in CRC cell lines with different metastatic capabilities was detected by WB.Cell invasion and migration were detected using ANGPTL1 siRNA.Results ANGPTL1 expression in CRC tissues was much lower than that in non-cancerous tissues (44％ vs.76％,P ＜ 0.01).ANGPTL1 expression was negatively associated with T stage (x2 =5.766,P =0.016),lymph node metastasis (x2 =5.571,P =0.018) and TNM stage (x2 =7.773,P =0.005).Moreover,CRC patients with ANGPTL1 positive expression had a better prognosis.ANGPTL1 protein and mRNA levels in CRC tissues were higher than in non-cancerous tissues (t =3.126,P =0.005;t =2.523,P =0.019).ANGPTL1 interference promoted cell invasion and migration of HCT116 cells.Conclusion ANGPTL1 expression is closely associated with tumor T stage,lymph node metastasis,TNM stage and worse prognosis of CRC patients.ANGPTL1 inhibits cell invasion and migration of CRC cells.