Targeted drug delivery can significantly increase the concentration of the drug in treatment site, and decrease the dosage of drugs, cost of treatment and the drug's adverse effects on the body. So targeted drug delivery is the hotspot of recent studies. This paper reviews the development of targeted drug delivery research in recent years, including three areas: passive targeting, active targeting, and physical and chemical targeting.

Objective To investigate the effect of hyperbaric oxygen therapy on serum procalcitonin (PCT), white blood cells(WBC) and high-sensitivity C-reactive protein (hs-CRP) levels in children with necrotising fasciitis (NF) and its efficacy, and explore the diagnosis value of above indicators.Methods From March 2011 to June 2014,50 cases children with acute necrotic fasciitis treated in Children's Hospital of Hebei Province as study group,which were randomly divided into hyperbaric oxygen group (n =25) and routine group (n =25) .The routine group received the routine therapy of incision and drainage to clear the lesion, hyperbaric oxygen group received hyperbaric oxygen therapy on the basis of routine group,while 50 healthy children were selected as control group.The serum PCT, WBC, hs-CRP levels, efficacy, complications, death and hospitalization time were observed and compared.Results The serum PCT, WBC and hs-CRP levels pre-treatment in study group were higher than those in control group(P<0.05).The area under the ROC curve of PCT and hs-CRP was 1.000,respectively, and WBC was 0.804, there were significant difference between PCT and WBC (Z=5.250,P=0.000), between hs-CRP and WBC (Z=5.037,P=0.000).After treatment, the wounds of 23 case patients (92.00%) were cured in hyperbaric oxygen group, and 21 cases in routine group (84.00%) , there were no significant difference in cure rate between two groups.There were six cases(24.00%) of complications and one case (4.00%) of death in hyperbaric oxygen group,while nine cases (36.00%) of complications and two cases (8.00%) of death, there were no significant difference in complications rate and death rate between two groups.The hospitalization time in hyperbaric oxygen group was (39.17 ±6.73) d, which was significantly lower than (52.13 ±4.28) d in routine group(P<0.05).Conclusion PCT and hs-CRP have certain value in diagnosis of children with acute necrotizing fasciitis; incision and drainage combined with hyperbaric oxygen therapy has a better clinical effect in the treatment of children with acute necrotizing fasciitis.

Aim TostudytheeffectsofCuO,ZnOand TiO2 nanoparticles on the viability and metastatic po-tential of EC-9706 and EC-109 esophageal squamous carcinomacelllineinvitro.Methods Characteristics of CuO,ZnO and TiO2 nanoparticles were detected u-sing transmission electron microscope (TEM)and dy-namic light scattering (DLS ).EC-9706 and EC-109 cells were treated with different concentrations of CuO, ZnO and TiO2 (5 ~80 mg · L-1 ).The cell prolifera-tion was analyzed by MTT assay.The cell cycle and apoptotic rates were determined by flow cytometry (FCM).The cell invasion was assayed in Transwell chambers.The expression of Bcl-2 and caspase-3 pro-tein in cells was detected by Western blot method.Re-sults CuO,ZnOandTiO2nanoparticleswerespheri-cal with primary particle size 12,20. 6,12 nm.The particles were agglomerated in water and cell culture medium with negative charge.CuO and ZnO nanoparti-cles induced decreases in EC-9706 and EC-109 cell vi-ability dose-dependently.After exposed to increasing concentrations of CuO and ZnO nanoparticles,the cell cycle analysis revealed a decreasing proportion of cells in G2/Mand S phase,and up-regulation of the cells in G0/G1 phase.Apoptotic cells also increased along with decreased cell invasion upon CuO and ZnO treatment. Nanoparticles treatment after 48 h, the activated caspase-3 expression quantity increased significantly and the Bcl-2 expression quantity decreased obviously (P<0. 05 )compared with control group.TiO2 nanop-articles had no obvious effect on the EC-9706 and EC-109 cell proliferation,cell cycle,apoptosis and inva-sion.Conclusion ComparedwithTiO2,CuOand ZnO nanoparticles can inhibit EC-9706 and EC-109 cell viability and metastatic potential,the mechanism of action involves cell cycle arrest in G0/G1 phase and apoptosis.These findings can help the development of nanoparticles as anti-cancer therapeutics for esophageal cancer.

Objective To analyze the infiltration abundance of macrophage M2 in breast cancer tissues and explore the correlation between VSIG4 and macrophage M2 and the potential mechanism of regulating the invasion and migration of breast cancer patients. Methods We downloaded the RNA-seq data of TCGA-BRCA and assessed the infiltration abundance of immune cells in the samples by CIBERSORT, and established a prognostic risk prediction model. Then, we analyzed the effect of macrophage M2 and VSIG4 on the prognosis of breast cancer patients. In addition, we analyzed the signaling pathway associated with VSIG4 by gene set enrichment analysis and predicted its upstream regulation of miRNA. Results The infiltration abundance of macrophage M2, age, PR status and pathological stage were involved in the establishment of risk prediction model, and the model had a good prediction performance (AUC=0.816). High infiltration of macrophage M2 (HR=1.35, P < 0.05) and high expression of VSIG4 (HR=1.4, P=0.039) suggested poor prognosis of breast cancer patients. VSIG4 could be regulated by upstream miR-29a-3p and significantly correlated with Toll-like receptor, cell adhesion, production and release of cytokine. Conclusion VSIG4 is significantly associated with breast cancer patients' prognosis and infiltration of macrophage M2, regulated by the upstream miR-29a-3p and promotes the invasion and migration of breast cancer cells. It can be used as a potential prognostic marker for breast cancer.

Objective:To explore the effect of esophageal squamous cell carcinoma-related long non-coding RNA (lncRNA) ESCCAL-1 on the polarization of THP-1 cells-derived macrophages.Methods:The esophageal cancer cell line KYSE450 was divided into 5 groups: KYSE450 group (normal KYSE450 cells), shRNA-ESCCAL-1 group (infected with knockout ESCCAL-1 lentivirus), shRNA-NC group (infected with interference control lentivirus), OE-ESCCAL-1 group (infected with overexpressing ESCCAL-1 lentivirus) and OE-NC group (infected with overexpressed control lentivirus). The expression of ESCCAL-1 was detected by real-time quantitative polymerase chain reaction (qRT-PCR). After co-culture of cells in each group with THP-1 cells-derived macrophages, flow cytometry was used to detect the expressions of THP-1 cells-derived macrophages M1 polarization markers HLA-DR, iNOS, CD86 and M2 polarization markers Arg-1, CD163, CD206, and inflammatory cytokines.Results:After THP-1 cells were stimulated with 100 ng/ml phorbol ester for 48 hours, the cells grew adherently, and the expression levels of CD11b and CD36 increased, indicating that THP-1 cells were successfully differentiated into macrophages. After THP-1 cells-derived macrophages were co-cultured with esophageal cancer KYSE450 cell line treated differently for 24 hours, there were no significant differences in the expressions of M1 polarization markers HLA-DR, iNOS and CD86 between shRNA-ESCCAL-1 group and shRNA-NC group or between OE-ESCCAL-1 group and OE-NC group (all P > 0.05). Compared with shRNA-NC group, the expressions of M2 polarization markers Arg-1, CD163 and CD206 in shRNA-ESCCAL-1 group decreased [8.54±0.29 vs. 11.83±0.69, 12.0±0.3 vs. 24.5±0.8, 2.05±0.23 vs. 14.54±1.10], and the differences were statistically significant ( t values were 7.636, 27.38 and 19.31, all P < 0.01); compared with the OE-NC group, the expressions of M2 polarization marker Arg-1, CD163 and CD206 in OE-ESCCAL-1 group increased [32.60±1.14 vs. 14.20±0.20, 43.7±1.5 vs. 25.1±1.2, 35.8±0.7 vs. 13.6±0.6], and the differences were statistically significant ( t values were -27.58, -17.24 and -43.98, all P < 0.01). Compared with shRNA-NC group, the expression level of interferon-γ in shRNA-ESCCAL-1 group decreased [(6.3±1.5) pg/ml vs. (20.0±2.6) pg/ml, t = 7.75, P = 0.001]; compared with OE-NC group, the expression level of interleukin-1RA in OE-ESCCAL-1 group increased [(3 167±306) pg/ml vs. (467±176) pg/ml, t = -13.27, P < 0.01]. Conclusions:Esophageal squamous cell carcinoma-related lncRNA ESCCAL-1 can promote the M2 polarization of macrophages.