Objective The aim of the study was to investigate the diabetic neuro-degeneration and its changes in neuroreaction to myocardial ischemia and reperfusion,by evaluation of the altera-tion of noxious thermal threshold and expression of substance P (SP),calcitonin gene related peptide (CGRP)in dorsal root ganglia in upper thoracic segments (T1-5 )in diabetic rats.Methods Thirty two male Sprague-Dawley rats,weighing 180-200g,were randomly divided into control group (group C)and diabetic group (group DM),1 6 rats in each group.rats in DM group were fed with high sug-ar-fat diet for 14 weeks and were given streptozotocin (STZ,35 mg/mg,i.p.)at the end of the 4 th week,to set up diabetes experimental model.The animals in control group were fed with standard la-boratory diet.Tail flick latency to thermal stimulation was measured weekly.At the end of 10 weeks after administration of STZ,diabetic rats (and rats in control group)were further divided into myo-cardial ischemia-reperfusion group (group IR)and sham operation group (group Sham).The left an-terior descending branch of coronary artery was occluded for 30 min followed by reperfusion for 120 min,establishing myocardial ischemia-reperfusion.The histological immunofluorescence assay and Enzyme-linked immunosorbent assay (ELISA)were carried out to evaluate the changes of the expres-sions of CGRP and SP in the dorsal root ganglia.Results The tail flick latency was significantly in-creased in group DM,compared to the group C (P < 0.01).The immunoreactive materials for CGRP and SP in the sensory neurons in dorsal root ganglia of upper thoracic segments (T1-5 )were markedly declined in group DM (P <0.01 or P < 0.05).Furthermore,levels of SP and CGRP were signifi-cantly lower in the DRG of the group IR after myocardial ischemia-reperfusion,compared to that in the group sham (P <0.01).Conclusion Diabetes causes sensory denervation and obvious reduction of expression of SP and CGRP in the sensory neuron innervating heart during myocardial ischemia-reper-fusion,indicating impairment of adaptive reactivity of neuro-endocrine function of cardiac sensory nerves.

Objective To explore the effect of vitamin D receptor (VDR) in intestinal tumor development and the relationship between VDR and β-catenin signaling pathway. Methods The interaction of vitamin D receptor and β-catenin were detected by co-immunoprecipitation assay after human colonic carcinoma cells SW480 were treated with vitamin D in vitro for 4 hours. The expression of E-cadherin protein was detected by Western blot after treated for 24 hours. To compare APCmin/+VDR-/- and APCmin/+ mice in vivo, the expression of VDR,β-catenin and BrdU proteins in intestinal tumor were determined by immunohistochemistry. The expression of β-catenin protein in tumor and adjacency intestinal was further determined by Western blot. Results After SW480 cells were treated with vitamin D, vitamin D receptor and β-catenin protein showed binding, the expression of E-cadherin protein further increased (Gray value the control group 145.57±4.21,Gray value of the experimental group 109.35±3.56,t＝32.63,P＜0.05). Immunostaining and Western blot detection（Gray value 166.47±2.36） showed a marked increase of β-catenin level(Gray value 140.51±2.57) in APCmin/+VDR-/- tumor compared to APCmin/+ tumor(145.41±3.62,182.35±3.24,t＝2.65,4.36,P＜0.05). Conclusions The role of vitamin D suppressing intestinal tumor may be achieved through VDR affectingβ-catenin signaling pathway.

ObjectiveTo explore the relationship among 25-hydroxyvitamin D,serum calcium,calcium-sensing receptor,and breast cancer. Methods The expressions of calcium-sensing receptor (CaSR) in primary breast cancer,breast benign tumors,and normal breast tissue beside tumors were determined by immunohistochemistry S-P method as well as the concentration of serum 25 (OH) D and serum calcium in breast cancer and breast benign tumors by Enzyme-linked immunosorbent assay (ELISA),Tribromoarsenazo Ⅲ method.ResultsSerum 25 (OH) D level of breast cancer was significantly lower than the breast benign tumors [ (34.13 ± 14.14) nmol/L vs (50.29 ± 25.65 ) nmol/L,t =2.870,P =0.001 ].Serum level of 25 ( OH ) D in lymph node metastasis positive patient was lower than that in negative group [ (30.8 ± 9.71 ) nmol/L vs (43.7 ± 23.59) nmol/L,t =2.467,P =0.021 ].The positive expression of CaSR in breast cancer(88.9％ )was higher than breast benign tumors(60％,x2 =6.717,P ＜ 0.01 ) and normal breast tissue beside tumors (60％,x2 =5.628,P ＜ 0.05 ).ConclusionsConcentration of serum 25 (OH)D and expression of calcium-sensing receptor in the tissues may be associated with occurrence,development and prognosis of breast cancer.

Objective To investigate the expression and clinical significance of CXCR3/CXCL10in human cancer.Methods CXCR3 and CXCL10 were detected in 60 paraffinic tissues of patients with primary breast cancer,20 of mammary fibroma and 20 of mastopathy by immunohistochemistry S-P method and two stage method.Results The expression of CXCR3 (40/60,66.7％ ) and CXCL10 (45/60,75％)in breast cancer was higher than that in mastopathy [CXCR3(8/20,40％ )x2 =4.44,P =0.035 ;CXCL10( 10/20,50％ )x2 =4.36,P =0.037)].The expression of CXCR3 was related to status of axillary lymph node metastasis,clinical stage and the expression of HER-2 (x2 =4.15,P =0.042; x2 =7.74,P =0.021 ;x2 =4.27,P =0.039).The expression of CXCR3 had positive relationship to the number axillary lymph node metastasis( rs =0.375,P =0.003 ),clinical stage ( rs =0.451,P =0.000).Conclusions CXCR3 may be related to the progression and metastasis of breast cancer,and it may be used as a marker of breast cancer prognosis.

BACKGROUND:The medial patellofemoral ligament reconstruction is the most commonly used method for the treatment of lateral dislocation of patella at present.The ultimate goal is to adjust the patella to the normal anatomical position and restore the patella track.Currently,the main core problem of medial patellofemoral ligament reconstruction is the selection of its femoral end fixation point. OBJECTIVE:Finite element method was used to analyze the limiting effect of the reconstructed medial patellofemoral ligament on the patella at different flexion angles of the knee joint,and to simulate the limiting effect of medial patellofemoral ligament reconstruction at different fixation points of the femoral end on the patellofemoral end,so as to provide help for the selection of fixation points of the femoral end during the reconstruction of the medial patellofemoral ligament. METHODS:A finite element model of knee including bone and soft tissue was established according to the extracted CT and MRI data of knee joint.When the knee flexion angle of 30° and 60° was simulated,the medial patellofemoral ligament was constructed by selecting different fixation points of femur end.The contact stress and contact area between patellofemoral joints at different points were compared,as well as the transverse binding force on patella.The equilength of the medial patellofemoral ligament constructed from the same fixation point of the femoral end at different flexion angles was verified to study the effect of various reconstruction positions of the medial patellofemoral ligament. RESULTS AND CONCLUSION:(1)A three-dimensional finite element model of the knee joint at 30° and 60° flexion angles was established to construct the medial patellofemoral ligament at different fixation points of the femur end.The medial patellofemoral ligament constructed at the same position of the femur end had usable isometric length at different flexion angles.(2)After the lateral displacement of the patella,in the transverse direction,the medial patellofemoral ligament constructed at different fixed points of the femur end produced different transverse binding force on the patella,and the transverse binding force was maximum at the anterior 10 mm and minimum at the proximal 5 mm.In the longitudinal direction,the location and size of stress concentration points on the patella cartilage were roughly the same,and the contact pressure did not change much.However,the contact area between the patella cartilage and the femoral cartilage was significantly different,with the maximum contact area at 10 mm at the front end and the minimum contact area at 5 mm at the proximal end.(3)The medial patellofemoral ligament constructed at the center of the saddle region has a good lateral restriction on the patella,but does not cause excessive restriction on the patella in the longitudinal restriction,and can achieve a good restriction on the patella.

BACKGROUND:The injury of the anterior talofibular ligament is most common in joint ligament injuries.The use of the finite element method to simulate ankle joint motion has the advantages of short experimental time,complex boundary conditions that can be simulated,and mechanical properties. OBJECTIVE:To analyze the effect of the anterior talofibular ligament on the stress distribution of the talus trochlea and the stability of the ankle joint. METHODS:A finite element model of the ankle was established based on CT and MRI images of patients with anterior talofibular ligament injury who were followed up for two months after Brostr?m surgery to simulate ankle joint stress in patients with anterior talofibular ligament injury before and after surgery during normal gait cycles(ground phase,neutral phase,and off-ground phase).The stress distribution and maximum stress value of the talus bone cartilage were measured before and after surgery,and their differences were analyzed. RESULTS AND CONCLUSION:Under normal gait,the anterior talofibular ligament has a certain protective effect on the talus trochlea in any position,reducing the wear of the ankle joint on the talus trochlea during movement.In all three phases,stress concentration was observed on the surface of the talus trochlea near the inner side of the ankle joint.The influence of the anterior talofibular ligament on the stability of the talus trochlear is much greater in the off-ground phase than in the ground phase and neutral phase.Under certain circumstances,the greater the torque on the ankle joint,the more significant the effect of the anterior talofibular ligament on the stability of the talus trochlea.

Objective:To investigate the emergency surgical strategies for patients with acute abdomen during the Corona Virus Disease 2019 (COVID-19) outbreak.Methods:The retrospective and descriptive study was conducted. The clinical data of 20 patients with acute abdomen who were admitted to the Union Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology between January 18, 2020 and February 10, 2020 were collected. There were 13 males and 7 females, aged from 25 to 82 years, with an average age of 57 years. All the patients with emergency surgeries received pulmonary computed tomography (CT) examination before surgery, and completed nucleic acid detection in throat swab if necessary. Patients excluded from COVID-19 underwent regular anesthesia, suspected and confirmed cases were selected a proper anesthesia based on their medical condition and surgical procedure. Patients excluded from COVID-19 underwent emergency surgeries following the regular procedure, suspected and confirmed cases underwent emergency surgeries following the three-grade protection.Observation indicators: (1) surgical situations; (2) postoperative situations. Measurement data with normal distribution were represented as average (range). Count data were described as absolute numbers.Results:(1) Surgical situations: of the 20 patients with acute abdomen, 16 patients were excluded from COVID-19, and 4 were not excluded. All the 20 patients underwent emergency abdominal surgeries successfully, of whom 2 received surgeries under epidural anesthesia (including 1 with open appendectomy, 1 with open repair of duodenal bulbar perforation), 18 received surgeries under general anesthesia (including 9 with laparoscopic repair of duodenal bulbar perforation, 3 with open partial enterectomy, 3 with laparoscopic appendectomy, 1 with laparoscopic left hemicolectomy, 1 with laparoscopic right hemicolectomy, 1 with cholecystostomy). The operation time of patients was 32-194 minutes, with an average time of 85 minutes. The volume of intraoperative blood loss was 50-400 mL, with an average volume of 68 mL. (2) Postoperative situations: 16 patients excluded from COVID-19 preopratively were treated in the private general ward postoperatively. One of the 16 patients had fever at the postoperative 5th day and was highly suspected of COVID-19 after an emergency follow-up of pulmonary CT showing multiple ground-glass changes in the lungs. The patient was promptly transferred to the isolation ward for treatment, and results of nucleic acid detection in throat swab showed double positive. Medical history described by the patient showed that the patient and family members were residents of Wuhan who were not isolated at home during the epidemic. There was no way to confirm whether they had a history of exposure to patients with COVID-19. Medical staffs involved in this case did not show COVID-19 related symptoms during 14 days of medical observation. The other 15 patients recovered well postoperatively. The 4 patients who were not excluded from COVID-19 preoperatively based on medical history and results of pulmonary CT examination were directly transferred to the isolation ward for treatment postoperatively. They were excluded from COVID-19 for two consecutive negative results of nucleic acid detection in the throat swab and recovered well. Two of the 20 patients with acute abdomen had postoperative complications. One had surgical incision infection and recovered after secondary closure following opening incision, sterilizing and dressing, the other one had intestinal leakage and was improved after conservative treatment by abdominal drainage. There was no death in the 20 patients with acute abdomen.Conclusions:Patients with acute abdomen need to be screened through emergency forward. Patients excluded from COVID-19 undergo emergency surgeries following the regular procedure, and patients not excluded from COVID-19 undergo emergency surgeries following the three-grade protection. The temperature, blood routine test and other laboratory examinations are performed to monitor patients after operation, and the pulmonary CT and throat nucleic acid tests should be conducted if necessary. Patients excluded from COVID-19 preopratively are treated in the private general ward postoperatively, and they should be promptly transferred to the isolation ward for treatment after being confirmed. Patients who are not excluded from COVID-19 preoperatively based on medical history should be directly transferred to the isolation ward for treatment postoperatively.

Objective:To investigate the kinetic metrics of 68Ga-fibroblast activation protein inhibitor (FAPI)-04 in pancreatic cancers and normal organs by using total-body PET dynamic imaging. Methods:From December 2020 to December 2021, 68Ga-FAPI-04 total-body PET/CT dynamic imaging were performed on 6 pancreatic cancer patients (3 males, 3 females, median age 55.5 years) in Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University. Images were respectively analyzed. Manual delineations of volume of interests (VOIs) on multiple normal organs and pathological lesions were performed and time-to-activity curves (TACs) were generated. A reversible two-tissue compartment model (2TCM) was fitted for each tissue TAC. Rate constants including K1, k2, k3 and k4, and the total volume of distribution ( Vt) were obtained and compared by tissue types. Wilcoxon rank sum test and Spearman correlation analysis were used for data analysis. Results:Kinetic metrics varied significantly among normal organs and pancreatic cancer lesions ( z values: 2.00-1 240.00, all P<0.05). The highest K1 among lesions was observed in primary tumor (0.30 min -1), which was observed in the spleen (1.42 min -1) among normal organs. The highest k2 among lesions was observed in peritoneal metastases (0.24 min -1), which was observed in the spleen (2.59 min -1) among normal organs. Primary tumor showed the highest k3 of 0.17 min -1 among lesions, and the pancreas had the highest k3 of 0.16 min -1 among normal organs. Primary tumor had the highest k4 of 0.03 min -1 among lesions, and the heart, lungs, parotid glands had high k4(0.06 min -1) among normal organs. Vt were higher in pathological lesions compared to normal organs, with the highest in primary tumor (13.78 ml/cm 3). There were correlations between Vt in lesions and SUV mean( rs=0.86, P<0.001) or SUV max ( rs=0.77, P<0.001). Conclusion:The rate constants including K1, k2, k3 and k4, and Vt of 68Ga-FAPI-04 vary among normal organs and lesions.