Expression of a novel inhibitor of apoptosis protein livin in malignant tumor cells and tissues and its clinical significance / 肿瘤

ABSTRACT

Objective: To examine and analyze the expression of two isoforms of livin (livin α/livin β), a novel inhibitor of apoptosis protein (IAP) family member, in tumor cell lines and malignant tumor tissues and analyze the relationship between livin expression and clinical pathological features of different tumors. Methods: Livin mBNA expression was detected by reverse transcription polymerase chain reaction (BT-PCR) in 12 malignant tumor cell lines, 50 different malignant tumor tissues, and 20 cases of normal tissues. Results: Livin mBNA was highly expressed in seven cell lines (Hela, SPEA-1, SBE-2, PC14, MKN45, LOVO, and HHCC) and poor expressed in A549 cells, It had negative expression in other four kinds of cell lines ( HL-7702, Hep-2, 7721 and K562). Livin mRNA was positively expressed in 32 of 50 malignant tumor cases (64.0%). The expression of livin mRNA was at low level in paracancerous tumors tissues (2%). Livin expression had no significant association with differentiation degree, lymph node metastasis and TNM staging of tumor patients. Conclusion: Livin expression in tumor cell lines and malignant tumor tissues provides stronger evidence for further investigating the relationship between livin and tumor initiation and development. It may serve as a new target for malignant tumor diagnosis and therapy.