[Inhibitory effects of RNA interference on expression of matrix metalloproteinase-9 gene and invasiveness and adhesion in ovarian cancer cells].
OBJECTIVE
To investigate the inhibitory effects of RNA interference (RNAi) on the expression of matrix metalloproteinase-9 (MMP-9) gene and invasiveness and adhesion of ovarian cancer cells.


METHODS
Four groups of different specific target sequence in coding region of MMP-9 and one non-specific sequence were chosen, which were Site1, Site2, Site3, Site4 and Site5. Small interference RNA (siRNA) expression cassettes (SEC) were constructed by PCR and transfected into ovarian cancer HO-8910PM cells. RT-PCR and western blot were used to detect mRNA and protein expression of MMP-9 gene; the abilities of invasion and adhesion were detected by Matrigel invasion assay and cell adhesion assay.


RESULTS
The expression of MMP-9 was inhibited and the inhibitory effects of different sequence were varied. The mRNA expression was 0.64 +/- 0.06, 0.47 +/- 0.07, 0.55 +/- 0.10 in Site1, Site2, Site3 group, and protein expression was 0.30 +/- 0.09, 0.27 +/- 0.08, 0.37 +/- 0.12, respectively. Site2 group had the most efficient inhibitory effect, followed by Site1 and Site3 groups. Cell growth curve revealed that cell growth was significantly inhibited in Site2 group. Invasiveness and adhesion were significantly reduced, the inhibitory rate on invasion in Site1, Site2, Site3 groups were 50.0%, 50.0% and 37.5%, respectively; the inhibitory rate on adhesion in Site1, Site2, Site3, Site4 groups were 43.8%, 48.8%, 33.9%, 24.2% at 60 min and 41.6%, 40.2%, 35.1%, 16.0% at 90 min, respectively.


CONCLUSIONS
RNAi exists in ovarian HO-8910PM cells. MMP-9 siRNA can specifically down-regulate MMP-9 expression and lead to the inhibition of invasiveness and adhesion in ovarian cancer cells.
Hu
Xiao-xia
XX
Department of Gynecology Oncology, Affiliated Tumor Hospital of Guangxi Medical University, Nanning 530021, China.
Li
Li
L
Li
Dan-rong
DR
Zhang
Wei
W
Tang
Bu-jian
BJ
D015153:Blotting, Western; D002448:Cell Adhesion / Q000187:drug effects; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D015536:Down-Regulation; D005260:Female; D015971:Gene Expression Regulation, Enzymologic; D006801:Humans; D020780:Matrix Metalloproteinase 9 / Q000096:biosynthesis / Q000235:genetics*; D009361:Neoplasm Invasiveness; D010051:Ovarian Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D034622:RNA Interference; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D034741:RNA, Small Interfering / Q000235:genetics / Q000494:pharmacology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014162:Transfection
D012333:RNA, Messenger; D034741:RNA, Small Interfering; D020780:Matrix Metalloproteinase 9