The organ system-integrated curriculum system overcomes the limitations of single teaching methods and the drawbacks of neglecting holism and interconnectedness, effectively transforming knowledge into competency. Tianjin Medical University has pioneered the "double-track integrated teaching reform" to align with the objective of training undergraduate clinical medical talents. This system is centered on the eight major human body systems, breaking traditional disciplinary boundaries and achieving systematic integration of basic medical and clinical courses. First implemented in 2019 in the "5+3" clinical and pediatric programs, the system has undergone three rounds of teaching practice since 2021, forming a distinctive integrated curriculum system. Using the circulatory system as a model, the reform reorganized teaching content, developed specialized textbooks, and assembled interdisciplinary teaching teams, fostering a shared instructional approach through cross-disciplinary training. The teaching model integrates theoretical and practical learning with curriculum-based ideological and political education, employing problem-based learning to encourage self-directed study and leveraging an online-offline mixed approach to enhance teaching effectiveness. An innovative closed-loop assessment system incorporating formative evaluation has been established, integrating multidimensional feedback from exam analysis, student and faculty questionnaire surveys, and teaching supervision to continuously optimize curriculum development. The reform has significantly enhanced medical students' professional competencies and overall capabilities, providing an innovative paradigm for training high-level medical professionals in the new era.

The organ system-integrated curriculum system overcomes the limitations of single teaching methods and the drawbacks of neglecting holism and interconnectedness, effectively transforming knowledge into competency. Tianjin Medical University has pioneered the "double-track integrated teaching reform" to align with the objective of training undergraduate clinical medical talents. This system is centered on the eight major human body systems, breaking traditional disciplinary boundaries and achieving systematic integration of basic medical and clinical courses. First implemented in 2019 in the "5+3" clinical and pediatric programs, the system has undergone three rounds of teaching practice since 2021, forming a distinctive integrated curriculum system. Using the circulatory system as a model, the reform reorganized teaching content, developed specialized textbooks, and assembled interdisciplinary teaching teams, fostering a shared instructional approach through cross-disciplinary training. The teaching model integrates theoretical and practical learning with curriculum-based ideological and political education, employing problem-based learning to encourage self-directed study and leveraging an online-offline mixed approach to enhance teaching effectiveness. An innovative closed-loop assessment system incorporating formative evaluation has been established, integrating multidimensional feedback from exam analysis, student and faculty questionnaire surveys, and teaching supervision to continuously optimize curriculum development. The reform has significantly enhanced medical students' professional competencies and overall capabilities, providing an innovative paradigm for training high-level medical professionals in the new era.

Aim To construct a lentiviral low expres-sion of miR-139-5 p vector and validate its expression efficiency in H9c2 cells. Method Target sequence was designed according to the sequence of rat miR-139-5p. Oligonucleotide duplex was synthesized and cloned into the lentiviral vector pGC-LV. The recombi-nant lentiviral vector, pHelper 1. 0, and pHelper 2. 0 were co-transfected into 293T cells, packaging virus. Then H9 c2 cells were infected with the supernatant containing lentiviral particles, and its infection effi-ciency and miR-139-5 p expression were determined by fluorescent microscope and real-time quantitative PCR, respectively. Results A lentiviral low expression of miR-139-5p vector was successfully constructed. The infection efficiency in H9c2 cells reached over 95%, and the relative expression of miR-139-5p was significantly down-regulated. Conclusion The lentiviral low expression of miR-139-5p vector is successfully constructed, and the expression of miR-139-5p in infected H9c2 cells is inhibited effectively.

Aims To investigate the protective effects of noninvasive limb ischemic preconditioning (LIPC) on myocardial ischemia-reperfusion (I /R)injury,and to explore the mechanism.Methods Healthy male Wistar rats were divided randomly into I /R,I /R +LIPC,I /R +5-Hydroxydecanoate (5-HD)and I /R +LIPC +5-HD groups.The I /R +LIPC and I /R +LIPC-5-HD groups of rats were subjected to three cy-cles of LIPC induction per day with 5 min of reperfu-sion after occlusion for 5 min at the left hind limb for 3 days.All rats were subjected to myocardial I /R injury on the fourth day.The I /R +5-HD and I /R +LIPC-5-HD groups of rats were given the inhibitor of ATP-sen-sitive potassium channel 5-HD before and during myo-cardial I /R injury. Results Compared with I /R group,LIPC reduced myocardial infarct size (P <0.05),lowered cardiocyte apoptosis index and Fas, FasL positive cell number (P <0.01 ),increased the reduced nitric oxide (NO)/endothelin (ET)-1 ratio (P <0.05)in serum in I /R +LIPC group.5-HD a-bolished the protective effects induced by LIPC in I /R+LIPC-5-HD group.Compared with normal myocardi-al tissue,expression of mir-30a-3p was increased in I /R group (P <0.01 )and was decreased in LIPC group (P <0.01 ).Conclusion LIPC alleviates myocardial I /R injury and improves endothelial function. The mechanism may be related with the opening of ATP-sensitive potassium channel,regulating the balance be-tween NO and ET-1 and decreasing the expression of myocardial mir-30a-3p.

Objective To evaluate the clinical value of multi-tomographic imaging mode of three-dimensional ultrasound combined with surface imaging in diagnosing and staging bladder tumors.Methods Seventy-five patients were examined with three-dimensional ultrasound and two-dimensional ultrasound.In addition,54 cases were undergone preoperative multislice spiral CT.All cases were proved by pathology after operation.Results The qualitation accuracy in the diagnosis of bladder tumor with two-dimensional ultrasound was 93.3%(70/75) and that of three-dimensional ultrasound was 98.7%(74/75).The staging accuracy rates with two-dimensional ultrasound and three-dimensional ultrasound were 83.5%(106/127) and 93.2%(123/132) respectively.The difference of bladder tumor staging between three-dimensional ultrasound and two-dimensional ultrasound was significant (P＜0.05).The qualitation accuracy in the diagnosis of bladder tumor with CT was 90.7%(49/54).The preoperative staging rate of CT was 79.7%(59/74),compared with that of three-dimensional ultrasound,the difference was significant(P＜0.05).Conclusions Multi-tomographic imaging mode of three-dimensional ultrasound combined with surface imaging can provide useful information and makes an improvement in detecting and staging bladder tumors.

30% was considered sensitive and the rate ≤30% was considered resistant;and the 6 specimens were divided into 2 group according to the above standard.cDNA microassay combined with clustering analysis was used to screen for resistance-related genes.Semi-quantitative RT-PCR was used for verification of HDAC1 gene expression.Results:Three of the 6 glioma specimens belonged to the drug resistance group and the other 3 to the drug sensitive group.cDNA microarray analysis combined with cluster analysis screened out 21 genes,with 6 up-regulated and 15 down-regulated.High expression of gene HDAC1 was noticed in all the 6 specimens by semi-quantitative RT-PCR,and the trend was similar to that by microassay.Conclusion:The primary drug resistance of glioma may be associated with the 21 genes screened by cDNA microarray;the detailed mechanisms for drug controlling still need to discussed in the future.