1.Endocytic pathways involved in the uptake of TAT-LHRH modified chitosan/DNA nanoparticles by HepG2 cells
Ruilong LAN ; Hailing ZHANG ; Lanxia LIU ; Xigang LENG
International Journal of Biomedical Engineering 2012;35(2):100-102,后插3
ObjectiveTo explore the endocytic pathway of TAT-LHRH modified chitosan/DNA nanoparticle (TLCDN) that exhibits high transfection efficiency and targeting to HepG2.MethodsPlasmid DNA was labeled with fluorescein,and the resulting fluorescent DNA was complexed with chitosan or TAT-LHRH modified chitosan to form chitosan/DNA nanoparticle (CDN) and TLCDN by the complex coacervation method.Internalization of TLCDN or CDN by HepG2 cells were measured in the presence of three kinds of inhibitors of endocytic pathway,Chlorpromazine,Filipin or Dynasore,using High-Content Analyzer to collect and analyze the data.ResultsChlorpromazine led to more decreased uptake of CDN than that of TLCDN,although not statistically significant.Filipin demonstrated significant inhibitory effect on the uptake of TLCDN while promoted the uptake of CDN.Dynasore resulted in a similar decrease in the uptake of both nanoprticles.ConclusionIt was demonstrated that CDN was taken up by HepG2 cells mainly through the clathrin-dependent endocytic pathway and TLCDN was more likely to be internalized by HepG2 cells through the caveolin-mediated endocytic pathway although the clathrin-dependent endocytic pathway was also involved.
2. Value of quantitative detection of plasma cell-free DNA in the assessment of inflammatory bowel disease activity
Wenqing LI ; Chengdang WANG ; Jing′an LIN ; Zeng WANG ; Yijuan LIU ; Jinyuan CHEN ; Xing YU ; Ruilong LAN
Chinese Journal of Digestion 2018;38(6):382-385
Objective:
To explore the value of plasma cell-free DNA (cfDNA) in the assessment of inflammatory bowel disease (IBD) activity.
Methods:
From July 2014 to June 2017, 145 IBD patients from the First Affiliated Hospital of Fujian Medical University were selected. The plasma content of cfDNA was detected by picogreen-based fluorescent quantitative method. At the same period, 37 healthy individuals were enrolled as control group. The correlation between cfDNA content and C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), and IBD activity was analyzed. The diagnostic capability of cfDNA in IBD activity was assessed by the receiver operating characteristic (ROC) curve.
3.MiR·223 protects mice from acute radiation-induced lung injury by inhibiting NLRP3
Zeng WANG ; Li SU ; Ruiqing CHEN ; Ruilong LAN ; Lengxi FU
Chinese Journal of Radiological Medicine and Protection 2019;39(3):166-171
Objective To investigate the radioprotective function and its mechanism of miR-223 in acute radiation-induced lung injury in mice.Methods Forty female C57BL/6 J mice were randomly divided into healthy control group,irradiation group,irradiation plus miR-223 group and irradiation plus NC group.Radiation groups were exposed with a single dose of 15 Gy of 6 MV X-rays delivered by a linear accelerator.The mice in drug group were administered by tail vein injection with miR-223 agomir or agomirNC every other day from 1 d before irradiation to 14 d after irradiation.The lung tissue samples of mice were taken at 14 d post-irradiation.The pathological changes were observed by HE staining.The localization and expressions of IL-1β and IL-18 were observed by immunohistochemistry (IHC).Real-time PCR was used to detect miR-223,but NLRP3 mRNA expression in lung tissue.Western blot was used to detect the protein expressions of NLRP3 and Caspase-1,and ELISA assay was used to detect the expressions of IL-1β and IL-18 in lung homogenate.Results Radiation decreased the expression of miR-223,but increased the expression of NLRP3 in lung tissue.Administration of miR-223 agomir inhibited the expression of NLRP3 and attenuated lung inflammation.HE and IHC staining showed that miR-223 reduced the acute inflammatory response and the expressions of IL-1β and IL-18 in lung tissue compared with irradiation group (t=10.16,6.00,P<0.05).The expressions of NLRP3 and Caspase-1 protein in lung tissue of irradiated plus miR-223 group was lower than that in the irradiation alone group (t =12.47,4.95,P< 0.05).ELISA assay also showed a decrease of inflammatory factors IL-1β and IL-18 in lung tissue homogenate of the irradiation plus miR-223 group (t =8.22,8.47,P<0.05).Conclusions MiR-223 effectively reduces the secretion of radiation-induced inflammatory factors IL-1β and IL-18 by inhibiting the expression of NLRP3 in lung tissue of mice,and thus has protective effect on radiation-induced lung injury.
4. Effect of ubiquitous mitochondrial creatine kinase on cisplatin sensitivity of human nasopharyngeal carcinoma cell line CNE-1
Ruilong LAN ; Fei HUANG ; Ruiqing CHEN ; Zeng WANG ; Junying CHEN ; Jing′an LIN ; Lengxi FU
Chinese Journal of Otorhinolaryngology Head and Neck Surgery 2018;53(7):524-529
Objective:
To investigate the effect of ubiquitous mitochondrial creatine kinase 1(CKMT1) on the sensitivity of human nasopharyngeal carcinoma cell line CNE-1 to DDP.
Methods:
CNE-1 cells were transiently transfected with CKMT1 overexpression (CKMT1) or empty vector (EV). The growth curve and DDP IC50 were developed by MTT assay, plate clone formation assay was performed by gradient concentration of DDP treatment, cell cycle and apoptosis were detected by flow cytometry, levels of apoptosis related protein Bax/Bcl-2/C-PARP and the transcription factor p-STAT3-Tyr705 were detected by Western Blot.
Results:
The transfection efficiencies of CKMT1 and EV were more than 90% with a higher proliferation rate in the CKMT1-transfected cells. However, the CKMT1-transfected cells had a DDP IC50 of 2.76 μmol/L, which was significantly lower than that of 4.60 μmol/L in the EV-transfected cells (