Study On The Role Of IL33 In The Regulation Of Oxidative Stress In High Sugar Skin Fibroblasts By PDT

[Background]Diabetic chronic skin trauma is one of the common complications of diabetes with low healing rate and high disability.At the same time,the prevalence rate is increasing,and it is urgent to seek more effective and feasible treatment.Studies have shown that low-dose phototherapy including intensive pulsed light(IPL)and photodynamic therapy(PDT)can promote wound healing,and some studies suggest that the effect of PDT is related to oxidative stress.However,its mechanism of action is complex,and there is no related literature to fully elaborate it.As a member of the IL1 family.IL33 is an important inflammatory and immune regulatory factor in the body,which is highly expressed in skin fibroblasts.Some studies have shown that IL33 can promote skin wound healing,but the specific mechanism is unknown.IL33 is a bidirectional effector,and oxidative stress may be related to its effect.Some drugs have the effect of regulating IL33,but can phototherapy regulate the expression of IL33?Does IL33 play an effect in promoting wound healing by PDT?No studies have been reported.Therefore,this study will conduct a preliminary discussion on it.[Objective]This research by the high sugar skin fibroblasts(Human dermal fibroblast,HFbs)simulation under the condition of diabetes skin fibroblast cells,cell scratch experiment preparation of diabetic skin trauma model.Try to joint IPL640 and ALA,PDT will be applied to high sugar HFbs,explore the conditions of PDT promote cell vitality and migration ability,and then observe the changes of IL33 expression.To preliminarily explore the relationship between the expression of IL33 and oxidative stress under the action of PDT and the role of IL33 in the effect of PDT,so as to provide a new clinical reference for the clinical treatment of chronic skin trauma in diabetes mellitus.[Methods]1.HFbs was cultured into three groups:PDT(IPL+PDT)group,IPL group and control group.ALA pretreatment time,concentration,IPL dose and observation time after laser were investigated,and appropriate parameters were selected for subsequent experiments.2.After the determination of relevant parameters,cell migration ability was observed,and CCK8,ROS,NO and IL33 were detected;And the changes of the above expressions after the addition of antioxidants and NOS inhibitors.3.Add exogenous IL33 to test CCK8,ROS and NO.[Results](1)under the conditions of 0.1 mM/L ALA pretreatment for 3h,IPL 640nm(pulse width 30ms)and 6J/cm2,the expression of ROS,NO and IL33 was significantly increased after 48h of PDT treatment,and the cell survival rate and migration capacity were increased.(2)antioxidants and NOS inhibitors can significantly reduce the effect of PDT on IL33 expression.(3)5ng/ml,lng/ml exogenous IL33 can significantly promote the expression of ROS and NO,but has NO significant effect on cell activity;0.2ng/ml IL33 has NO significant effect on the expression of ROS and NO,but can effectively promote the increase of cell activity.