[Clinical significance of macrophage migration inhibitory factor in invasion of ovarian cancer].
OBJECTIVE
Macrophage migration inhibitory factor (MIF) is closely related to tumorigenesis. This study was to investigate the effects of MIF gene on migration, invasion and proliferation of ovarian cancer cells and to evaluate the significance of MIF protein expression in ovarian cancer tissues.


METHODS
Small interfering RNA was used to transiently knock down the expression of MIF gene in HO-8,910 and OVCAR-3 cells. The effect of RNAi was assessed by RT-PCR and western blot. The migration, invasion and proliferation of ovarian cancer cells were determined by transwell chamber assay, invasion assay and MTT assay, respectively. Immunohistochemistry was utilized to examine the expression status of MIF in ovarian cancer tissues.


RESULTS
MIF RNAi significantly inhibited MIF expression in HO-8910 and OVCAR-3 cells and decreased cell proliferation of the two cells (P<0.05). The numbers of migrated and invaded HO-8910 cells were significantly less in the MIF-si1 and MIF-si2 groups than in the NC group, respectively [migration: (48.0+/-7.3) and (38.0+/-3.6) vs. (78.0+/-8.5), P<0.05; invasion: (35.0+/-5.0) and (30.0+/-5.6) vs. (65.0+/-4.6), P<0.05]. The numbers of migrated and invaded OVCAR-3 cells were significantly less in the MIF siRNA groups than in the NC group, respectively [migration: (40.0+/-4.5) and (42.0+/-3.0) vs. (65+/-2.1), P<0.05; invasion: (25.0+/-3.0) and (27.0+/-3.4) vs. (48.0+/-2.4), P<0.05]. Positive expression of MIF protein was detected in 53.5% of ovarian carcinoma tissues and was positively correlated to clinical stages of patients (P<0.01).


CONCLUSIONS
MIF might play an important role in the pathogenesis and progression of ovarian cancer. Thus, MIF might be used as a potential therapeutic target in ovarian cancer.
State Key Laboratory of Oncology in South China, Guangzhou, Guangdong 510060, P. R. China.
Hong-Mei
HM
Wu
Sen-Lin
SL
Zhu
Long-Jun
LJ
He
Yan-Hui
YH
Liu
Dan
D
Xie
D045744:Cell Line, Tumor; D002465:Cell Movement; D049109:Cell Proliferation; D005260:Female; D006801:Humans; D019746:Intramolecular Oxidoreductases / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D008263:Macrophage Migration-Inhibitory Factors / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D009361:Neoplasm Invasiveness; D009367:Neoplasm Staging; D010051:Ovarian Neoplasms / Q000378:metabolism / Q000473:pathology*; D034622:RNA Interference; D012333:RNA, Messenger / Q000378:metabolism; D034741:RNA, Small Interfering
D008263:Macrophage Migration-Inhibitory Factors; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D019746:Intramolecular Oxidoreductases; C515598:MIF protein, human