Objective:To explore the role of autophagy in the effects of titanium(Ti)nanotopography on macrophage polarization and inflammatory cytokine secretion under inflammatory microenvironment.Methods:4 groups were set as negative control(NC,on tissue culture plate),polished pure Ti surface(P),30 nm diameter nanotube(NT-30),and NT-30 with 3-Methyladenine(3-MA)treatment.Macrophage cell line RAW264.7 was cultured on different surfaces for 3 d and treated by LPS for 24 h.The autophagy was examined by transmission electron microscopy and Western blot while the cell morphology was observed by scanning electron mi-croscopy.The secretion of inflammatory cytokines was measured by Cytokine Array.Results:Under LPS stimulation,the autophagic degradation activity was significantly enhanced on Ti samples.On NT-30 surface,the autophagosomes formation was significantly in-creased,which was decreased after 3-MA treatment.Meanwhile,cells were obviously elongated on NT-30 surface and returned to spherical shape after 3-MA treatment.In addition,the pro-inflammatory cytokines and anti-inflammatory cytokines were significantly decreased and increased respectively on Ti surfaces,in which the NT-30 surface was the most obvious.After 3-MA treatment,the anti-inflammatory effect of NT-30 surface was inhibited.Conclusion:In inflammatory microenvironment,titania nanotubes surface could enhance autophagy activity to realize anti-inflammatory effect.

Objective:To explore the role of autophagy in the effects of titanium(Ti)nanotopography on macrophage polarization and inflammatory cytokine secretion under inflammatory microenvironment.Methods:4 groups were set as negative control(NC,on tissue culture plate),polished pure Ti surface(P),30 nm diameter nanotube(NT-30),and NT-30 with 3-Methyladenine(3-MA)treatment.Macrophage cell line RAW264.7 was cultured on different surfaces for 3 d and treated by LPS for 24 h.The autophagy was examined by transmission electron microscopy and Western blot while the cell morphology was observed by scanning electron mi-croscopy.The secretion of inflammatory cytokines was measured by Cytokine Array.Results:Under LPS stimulation,the autophagic degradation activity was significantly enhanced on Ti samples.On NT-30 surface,the autophagosomes formation was significantly in-creased,which was decreased after 3-MA treatment.Meanwhile,cells were obviously elongated on NT-30 surface and returned to spherical shape after 3-MA treatment.In addition,the pro-inflammatory cytokines and anti-inflammatory cytokines were significantly decreased and increased respectively on Ti surfaces,in which the NT-30 surface was the most obvious.After 3-MA treatment,the anti-inflammatory effect of NT-30 surface was inhibited.Conclusion:In inflammatory microenvironment,titania nanotubes surface could enhance autophagy activity to realize anti-inflammatory effect.

Objective:To explore the calvarial critical size defect (CSD)in rats with type 2 diabetes mellitus(T2DM).Methods:T2DM model of SD rats(weighted 300-320 g)was induced by high fat and high sugar diet and low dose intraperitoneal streptozotocin (STZ)injection.The rats with T2DMand the normal controls were divided into 4 groups(n=3)respectively.Defects with the diame-ter(mm)of 2,3,4 and 5 were made on the central calvaria of each rat.General observation,X-ray examination and histological study were performed 8 weeks postoperatively.Results:In the T2DM group,only the defects of 2 mm diameter were healed completely,X-ray resistance and new bone formation were observed;the defects of 3,4 and 5 mm diameter were unhealed,X-ray transmission was observed and newly formed bone was insufficient.In the control group,the defects of 2,3 and 4 mm diameter were healed completely, X-ray resistance and new bone formation were observed;the defects of 5 mm diameter were unhealed,X-ray transmission was ob-served,newly formed bone was insufficient.Conclusion:The calvarial CSD of T2DM rat model can be defined as the defect with the diameter of 3 mm.

Objective:To investigate the effect of recombinant Elafin on A549 apoptosis induced by paraquat and the underlying mechanism.Methods:pEGFP-C1-Elafin was transformed into A549 competent cells by electroporation.Transformed A549 was cultured for additional 24 h before Elafin mRNA was detected by RT-PCR and cocultured with or without various concentration of paraquat( PQ ) for different duration.A549 apoptosis percentage and reactive oxygen species ( ROS ) content were tested by flow cytometry .Nuclear factor erythroid like-2(Nrf2) heme oxygenase-1(HO-1) were examed by Western blot .Results:Elafin expressed successfully in A549 after transformation.PQ caused A549 apoptosis in a concentration dependent manner and leaded to ROS content increasing and Nrf2 and HO-1 decreasing.However,elafin could inhibit ROS production and A549 apoptosis,upregulate Nrf2 and HO-1.Conclusion:Elafin could restrict A549 apoptosis to some extent and the possible mechanism lied in its ability to upregulate Nrf2 ex-pression.