Objective To investigate the neural basis of glucagon-like peptide-1(GLP-1)in regulating glucose homeostasis and elucidate the molecular mechanisms.Methods Male Glp1r-IRES-Cre,Glp1r-KO,and wild-type mice were used in this study.Fiber photometry was employed to record Ca2+signals of neurons in ventromedial hypothalamus(VMH)and patch-clamp was used to analyze electrophysiological properties of GLP-1 receptor-positive(GLP-1RVMH)neurons.Viral stereotaxic injections,chemogenetics,plasma hormone assays,and routine glucose metabolism assessments were combined to determine the regulatory role of GLP-1RVMH neurons in glucose homeostasis.Tissue and cell mitochondrial respiratory function assays,transmission electron microscopy,and conventional molecular biology methods were used to explore the mechanism by which GLP-1R agonists regulate glucose homeostasis.Results When the glucose concentration decreased from 5.0 mmol/L to 0.5 mmol/L,the action potential frequency of GLP-1RVMH neuron decreased significantly[(4.51±0.80)Hz vs.(1.43±0.51)Hz,P<0.01].Activation of GLP-1RVMH neuron significantly enhanced insulin secretion[(7.60±0.56)μU/mL vs.(11.34±0.93)μU/mL,P<0.01],while inhibition of these neuronal activities impaired the hypoglycemic efficiency of GLP-1 agonists[(32.03%±0.91%)vs.(25.77%±1.09%),P<0.001)].Mechanistically,GLP-1 regulated glucose homeostasis through Drp1 phosphorylation-mediated mitochondrial fission and improved mitochondrial energy metabolism.Conclusion GLP-1RVMH neurons are a class of glucose-excited neurons,and which activated directly promotes secretion of insulin.The hypoglycemic effect of GLP-1R agonists depend on the neuronal activity of GLP-1RVMH.

Objective:To explore the effect of autologous vascular graft bridging of the popliteal artery defect to reconstruct the blood supply of leg on survival of lower extremity.Methods:From May 2021 to May 2024, 10 patients with traumatic popliteal artery injury with defect were treated in the Department of Hand and Foot Surgery, Nanhua Hospital Affiliated to University of South China. A retrospective analysis was conducted on clinical data of the patients. Injury sites were: 6 in left lower extremity and 4 in right lower extremity. Causes of injury were: 4 of traffic accident, 2 of heavy object compression, 2 of electric saw, and 2 of falling from heights. Sixe patients had large vessel injury combined with fracture and (or) knee dislocation, and 4 had simple large vessel injury. Six patients had open vascular injury and 4 had closed vascular injury. There were 6 popliteal artery defect and 4 femoral artery defect, with the defects ranging from 5.0 to 10.0 cm in length. Based on the condition of the arterial defect, autologous great saphenous vein (9 patient) and small saphenous vein (1 patient) were taken and prepared to different forms of vascular bridging graft, such as "single crotch-shape" (6 patient), "double crotch-shape" (3 patient) and "triple crotch-shaped" (1 patient) vascular bridging grafts, to have the defects of popliteal artery reconstructed. Scheduled postoperative follow-up was conducted at outpatient clinic and via telephone interviews. Detailed outcomes including the peripheral blood flow, presence of necrosis or ulcer as well as patient satisfaction were recorded.Results:All of the blood vessel anastomoses in 10 patients were successful and the distal blood supply of the affected legs was restored. All of the affective legs survived. Postoperative follow-ups at 3 to 12 months showed good blood flow in the legs without necrosis nor ulcer as well as a high patient satisfaction.Conclusion:The "crotch-shaped" autologous blood vessel graft can timely and effectively reconstruct defected main artery in popliteal fossa, reduce ischemia time of the affected leg, promote extremity survival and restore its function.

Objective To investigate the neural basis of glucagon-like peptide-1(GLP-1)in regulating glucose homeostasis and elucidate the molecular mechanisms.Methods Male Glp1r-IRES-Cre,Glp1r-KO,and wild-type mice were used in this study.Fiber photometry was employed to record Ca2+signals of neurons in ventromedial hypothalamus(VMH)and patch-clamp was used to analyze electrophysiological properties of GLP-1 receptor-positive(GLP-1RVMH)neurons.Viral stereotaxic injections,chemogenetics,plasma hormone assays,and routine glucose metabolism assessments were combined to determine the regulatory role of GLP-1RVMH neurons in glucose homeostasis.Tissue and cell mitochondrial respiratory function assays,transmission electron microscopy,and conventional molecular biology methods were used to explore the mechanism by which GLP-1R agonists regulate glucose homeostasis.Results When the glucose concentration decreased from 5.0 mmol/L to 0.5 mmol/L,the action potential frequency of GLP-1RVMH neuron decreased significantly[(4.51±0.80)Hz vs.(1.43±0.51)Hz,P<0.01].Activation of GLP-1RVMH neuron significantly enhanced insulin secretion[(7.60±0.56)μU/mL vs.(11.34±0.93)μU/mL,P<0.01],while inhibition of these neuronal activities impaired the hypoglycemic efficiency of GLP-1 agonists[(32.03%±0.91%)vs.(25.77%±1.09%),P<0.001)].Mechanistically,GLP-1 regulated glucose homeostasis through Drp1 phosphorylation-mediated mitochondrial fission and improved mitochondrial energy metabolism.Conclusion GLP-1RVMH neurons are a class of glucose-excited neurons,and which activated directly promotes secretion of insulin.The hypoglycemic effect of GLP-1R agonists depend on the neuronal activity of GLP-1RVMH.

Objective:To explore the effect of autologous vascular graft bridging of the popliteal artery defect to reconstruct the blood supply of leg on survival of lower extremity.Methods:From May 2021 to May 2024, 10 patients with traumatic popliteal artery injury with defect were treated in the Department of Hand and Foot Surgery, Nanhua Hospital Affiliated to University of South China. A retrospective analysis was conducted on clinical data of the patients. Injury sites were: 6 in left lower extremity and 4 in right lower extremity. Causes of injury were: 4 of traffic accident, 2 of heavy object compression, 2 of electric saw, and 2 of falling from heights. Sixe patients had large vessel injury combined with fracture and (or) knee dislocation, and 4 had simple large vessel injury. Six patients had open vascular injury and 4 had closed vascular injury. There were 6 popliteal artery defect and 4 femoral artery defect, with the defects ranging from 5.0 to 10.0 cm in length. Based on the condition of the arterial defect, autologous great saphenous vein (9 patient) and small saphenous vein (1 patient) were taken and prepared to different forms of vascular bridging graft, such as "single crotch-shape" (6 patient), "double crotch-shape" (3 patient) and "triple crotch-shaped" (1 patient) vascular bridging grafts, to have the defects of popliteal artery reconstructed. Scheduled postoperative follow-up was conducted at outpatient clinic and via telephone interviews. Detailed outcomes including the peripheral blood flow, presence of necrosis or ulcer as well as patient satisfaction were recorded.Results:All of the blood vessel anastomoses in 10 patients were successful and the distal blood supply of the affected legs was restored. All of the affective legs survived. Postoperative follow-ups at 3 to 12 months showed good blood flow in the legs without necrosis nor ulcer as well as a high patient satisfaction.Conclusion:The "crotch-shaped" autologous blood vessel graft can timely and effectively reconstruct defected main artery in popliteal fossa, reduce ischemia time of the affected leg, promote extremity survival and restore its function.

Objective:To investigate the clinical effect of free deep femoral artery third perforating flap repaired soft tissue loss after Pilon fracture surgery in I stage.Methods:Fifteen patients were treated from April, 2013 to January, 2020. Miller AO classification: 8 cases 43-C1, 4 cases 43-C2 and 3 cases 43-C3. All cases were accompanied with severe soft tissue contusion and skin necrosis. After fracture reduction, soft tissue defects, internal fixation exposure and tendon exposure around the wound. Free deep femoral artery third perforating flap (3.5 cm ×15.5 cm to 5.5 cm×12.5 cm) for the repair of soft tissue defects around ankle in the I stage, the blood vessels of the flap were end-to-side anastomosed with vessels of the posterior tibial or anterior tibial. Regular follow-up after surgery.Results:One case of venous crisis occurred, other 14 cases survived, were followed-up from 5 to 18 months, the ankle joint function was good, did not affect the foot shoes, with excellent color and texture, the flap restored protective sensation, and leaving only linear scar, no muscle adhesion.Conclusion:Free deep femoral artery third perforating flap repaired soft tissue loss of surgical incision after fracture operated than significantly reduce the postoperative fracture infection and protect the blood supply around the fracture. It is an effective method of repair.

Objective To discuss the effect of triple therapy plus traditional Chinese medicine in the treatment of peptic ulcer (PU) caused by Helicobacter pylori ( Hp) .Methods 148 cases with PU were randomly divided into study group and control group of 74 cases in each group.The control group were treated with triple therapy (omeprazole +clarithromycin +amoxicillin), and the study group were given liver-discharging and heat-clearing and invigorating spleen and removing blood stasis decoction, additionally.Both groups received treatment for one course of 4 weeks.The changes of clinical symptoms, negative conversion ratio of Hp and adverse reaction were compared.Results The scores of clinical symptoms were all significantly decreased in both two groups after treatment (P<0.05), but the study group changed more than control group (P<0.05).The total effective rate was 95.95%, rather higher than 79.73% in control group (P<0.05).The negative conversion ratio of Hp was 82.43%, obviously higher than 64.86% in control group (P<0.05).The incidence of adverse reaction was 12.16% in study group, similar to 9.46% in control group.Conclusion Triple therapy plus traditional Chinese medicine can significantly improve the clinical symptoms, clinical effect and negative conversion ratio of Hp, and has a good safety and tolerability.

Objective To evaluate the cilincial value of Min-probe sonngraphy(MPS)for submucosal protrusion lesion in gastric.Methods 82 cases with submucosal protrusion lesion in gastric were detected by Min-probe sonography(MPS)and treated according to the diagnosis.Results 82 cases were fibroid,38 stromal tumor,among which 12 cases from muscularis mucosa,26 case from the proper muscle layer,4 malignant stromal tumor,6 lipoma,3 angioma,3 gastric cysts,11 gastric polypi,8 heterotopic pancreas,9 pressures from outside organ.29 cases were accepted EMR and 18 cases accepted surgical operation.Conclusion MPS is more valuable in the diagnosis and the differential diagnosis of submucosal protrusion lesion in gastric and can guide the further therapy.

Objective To evaluate the diagnosis and treatment of primary retroperitoneal tumor. Methods The clinical data of 75 patients with primary retroperitoneal tumor confirmed by operation and pathology in recent 20 years in our hospital were analyzed retrospectively. Results About 57.3% of the patients were diagnosed accurately before the operation. Correct diagnostic rates of ultrasound and CT were 60.0% and 84.0% ,respectively.Of them 57cases(76.0%) were malignant and18 (24.0%) benign tumor. Tumor size was not related to the pathological characteristics.Radical resection was done in 42 patients(56.0%),partial resection in 23 patients (30.7%),and biopsy in 10 patients(13.3%).Conclusions Ultrasonic and CT are the major diagnostic methods. Early operation is recommended after necessary preparation. Surgical resection is a major procedure for the management of primary retroperitoneal tumor and might provide long surrival time.