Objective To investigate the effect of recombinant plasmid pshRNA-DNMT3b on expression of DNMT3b mRNA and protein and on the proliferation of bladder cancer T24 cells,and research the function of DNMT3b in the process of bladder tumor formation.Methods There were three groups in this study,which are blank controller,HK and pshRNA-DNMT3b(24h,48h,72h),respectively.T24 cells were cultured routinely and transfected by the recombinant plasmids with lipfectamine 2000.The cells were detected by methods of RT-PCR,western blot and MTT.The varying level of DNMT3b mRNA and expression protein,and the conditions of cellular survival rate were observed.Results The recombinant plasmids were successfully transfected into T24 cell lines.The grey valHe of RT-PCR elctrophoretogram was analyzed by the software of Gel-pro analyzer,the rate of blank controller,HK and pshRNA-DNMT3b(24h,48h,72h),was (99.56±1.24)%,(99.12±1.35)%,(75.77±1.42)%,(44.69±1.05)%and(20.52±0.89)%,respectively.The analytical resuit of western blot image was(99.43±1.28)%,(98.90±1.31)%,(67.83±1.02)%,(43.43±1.05)%and(21.92±0.89)%.There was no statistically difference in survival between blank control and HK(P＞0.05).The group of pshRNA-DNMT3b and other two groups had statistical difference only at the 72th hour and the cell inhibitory growth rate only increase 0.45%.Conclusions The recombinant ptasmid pshRNA-DNMT3b can inhibit the expression of mRNA and protein of DNMT3b effectively.However,it has slight function on inhibiting cell proliferation.

OBJECTIVE: The current study was designed to examine the expression of Skp2 gene in laryngeal squamous cell carcinoma (LSCC) and to investigate the role of Skp2 gene in tumorigenesis and progression of LSCC. METHOD: FQ-PCR method was used to examined the expression of Skp2 gene in 40 LSCC and 10 normal laryngeal mucosa tissues, and relationship between its expression and clinical biological factors of patients with LSCC was analyzed. RESULT: The median copy number of Skp2 mRNA expression in LSCC was 6622.54 copy/microg RNA, the median copy number of Skp2 mRNA expression in normal laryngeal mucosa tissues was 0 copy/microg RNA, there was a very significant difference between them (P < 0.01); The positive rate of Skp2 mRNA expression in LSCC and adjacent normal laryngeal tissue were 50%, 0, respectively (P < 0.01). The median copy number of Skp2 RNA expression in LSCC with cervical lymph node metastasis was 617138.4 copy/microg RNA, the median copy number of Skp2 mRNA expression in LSCC without cervical lymph node metastasis was 0 copy/microg RNA, there was a very significant difference between them (P < 0.05); The positive rate of Skp2 mRNA expression in LSCC with and without cervical lymph node metastasis were 100.00%, 35.48%, respectively (P < 0.01). CONCLUSION Skp2 gene might have relation with the cervical lymph node metastasis of LSCC. FQ-PCR is an accurate assay to detecting expression of Skp2 mRNA in patient with LSCC. The level of Skp2 mRNA expression might be a new and more accurate marker, and it can be used to predict cervical lymph node metastasis of LSCC.
Adult ; Aged ; Aged, 80 and over ; Carcinoma, Squamous Cell ; genetics ; Female ; Gene Expression ; Humans ; Laryngeal Neoplasms ; genetics ; Lymphatic Metastasis ; Male ; Middle Aged ; Polymerase Chain Reaction ; methods ; RNA, Messenger ; genetics ; S-Phase Kinase-Associated Proteins ; genetics ; metabolism

In this study,RNA interference technique was employed to silence the expression of DNMT1 and/or DNMT3b in human bladder cancer T24 cells.The expression levels of their mRNA and protein were greatly decreased by up to 75% and 65% respectively after T24 cells were transfected with lipofectamine2000 for 72 h,indicating RNA interference is an effective tool in gene knockdown.Proliferation and apoptosis of T24 cells were detected by MTT,and annexin-V-FITC and propidium iodide staining flow cytometry,respectively.It was found that loss of the DNMT1 or DNMT3b expression could inhibit the cell growth and promote the cell apoptosis to some extent.However,combined treatment with shRNA targeting both DNMT1 and DNMT3b mRNA could ob-viously enhance the above effects.It was concluded that simultaneously silencing both genes could result in strong suppressing effect on tumor proliferation and promoting ceil apoptosis than separate use,suggesting combined use of DNMT1 and DNMT3b can achieve a synergistic effect in the CpG island methylation in human bladder tumorigenesis.

Objective: To investigate the expression and clinical significance of exosomal miR-1231 in plasma of pancreatic cancer (PC) patients and pancreatic cancer cells. Methods: A total of 16 patients who were diagnosed with pancreatic cancer in Hunan Cancer Hospital were collected from April 2016 to August 2017. Meanwhile, 16 healthy volunteers were recruited as the healthy control group at the same period. The plasma exosomes were extracted, and the levels of miR-1231 were detected by qRT-PCR in PC and healthy control groups. Moreover, the clinicopathological significance of exosomal miR-1231 expression was analyzed. Furthermore, the expression of exosomal miR-1231 was detected in several pancreatic cancer cells (MIA PaCa-2, PANC-1, SW1990, AsPC-1 and BxPc-3) and two normal pancreatic epithelial cells (HPDE and human primary pancreatic epithelial cell). Results: qRT-PCR results showed that the expression level of miR-1231 in plasma exosomes of pancreatic cancer patients (1.06±0.46) was significantly lower than that in healthy controls (2.30±0.99; P<0.05). The levels of exosomal miR-1231 in patients with stage Ⅰ-Ⅱ (1.515±0.531), no distant metastasis (1.236±0.461) and no lymph node metastasis (1.337±0.522) were significantly higher than those with stage Ⅲ-Ⅳ (0.848±0.224), distant metastasis (0.757±0.278) and lymph node metastasis (0.838±0.261), respectively (P<0.05 for all). In addition, there were no correlation between exosomal miR-1231 expression and age, sex, smoking history, CA19-9 levels and tumor sites (P>0.05). Furthermore, the expression level of exosomal miR-1231 in pancreatic cancer cell lines (0.142±0.135) was significantly lower than that in normal epithelial cells (1.127±0.179; P<0.05). Conclusions The downregulation of exosomal miR-1231 in plasma of pancreatic cancer patients and pancreatic cancer cells suggests that it is related to the initiation and development of PC. It may be a new diagnostic and prognostic marker for PC.