To obtain large quantity of human leukocyte antigen F (HLA-F) and cluster of differentiation 8alpha homodimers (CD8alphaalpha) proteins and to study their relationship, HLA-F and CD8alpha genes with rare codon in Escherichia coli were cloned using an N-terminal synonymous mutation method. High-efficiency expression protein inclusion bodies were acquired. The proteins were refolded using the dilution method and purified with gel-filtration and anion exchange chromatography. The results of gel-filtration and native-PAGE indicate that HLA-F interacts with CD8alphaalpha. This interaction may affect the binding between CD8alphaalpha and other MHC molecules to regulate immune responses. These results provide a basis for further research of HLA-F.
CD8 Antigens ; biosynthesis ; genetics ; Escherichia coli ; genetics ; metabolism ; Histocompatibility Antigens Class I ; biosynthesis ; genetics ; Humans ; Mutation ; Protein Interaction Domains and Motifs ; Protein Multimerization ; Recombinant Proteins ; biosynthesis ; genetics ; isolation & purification

Objective To investigate the effects of ketamine on neuronal nitric oxide synthase (nNOS) activity and carboxy-terminal PDZ ligand of nNOS (CAPON) expression in the prefrontal lobe of mentally depressed rats.Methods Adult male Sprague-Dawley rats,aged 2.5-3.0 months,weighing 210-260 g,were used in the study.Menial depression was induced by exposing the rats to chronic unpredictable mild stress.Twenty-four animals in which mental depression was successfully induced were randomly divided into 2 groups (n =12 each):mental depression group (group D) and ketamine group (group K).Another 12 rats were chosen and served as control group (group C).Group K received intraperitoneal ketamine 10 mg/kg once a day for 7 consecutive days,while groups C and D received intraperitoneal normal saline 10 ml/kg instead of ketamine.Sucrose preference test and open field test were performed before administration and at 1 day after the end of administration.The total distance,number of rearing and sucrose preference percentage (SPP) were recorded.The rats were sacrificed 1 day after the last test for determination of the expression of nNOS and CAPON protein (using immuno-histochemistry)and mRNA (by RT-PCR) in the prefrontal lobe.Results Compared with group C,the total distance was shortened,the number of rearing and SPP were significantly decreased,the expression of nNOS protein and mRNA was up-regulated and the expression of CAPON protein and mRNA was down-regulated in groups D and K (P ＜ 0.05).Compared with group D,the total distance was prolonged,the number of rearing and SPP were significantly increased,the expression of nNOS and mRNA was down-regulated and the expression of CAPON protein and mRNA was up-regulated in group K (P ＜ 0.05).Conclusion Ketamine can improve the depressive state through promoting the expression of CAPON and inhibiting nNOS activity in the prefrontal lobe of mentally depressed rats.

Aim To investigate the effect of ketamine plus fluoxetine on depressed behavior and the expres-sion of neuronal nitric oxide synthase (nNOS)and CA-PON in prefrontal lobe of mentally depressed rats at different time points,so as to study the possible mecha-nism of ketamine plus fluoxetine inducing antidepres-sant behavior.Methods Healthy adult male Sprague-Dawley rats,aged 2.5 ~3 months,weighing 220 ~270 g,were induced as the rodent model of depression by chronic unpredictable mild stress (CUMS).After the models of depression were established,96 of CUMS modeling successfully depressed rats were selected. Then they were randomly divided into four groups (n =24 each):the depressed group (group D,untreated group),ketamine group (group K,treated with intrap-eritoneal injection of ketamine 1 0 mg·kg -1 once a day for 3 days or 7 days),fluoxetine group (group F,trea-ted with gavage of fluoxetine 1 .8 mg·kg -1 once a day for 3 days or 7 days),or ketamine plus fluoxetine group (group KF,treated with intraperitoneal injection of ketamine 1 0 mg·kg -1 plus gavage of fluoxetine 1 .8 mg·kg -1 once a day for 3 days or 7 days).Open field test and sucrose preference test were performed 1 day before depression model was established,and 1 day before and after treatment.The rats were sacrificed 1 day after the last test for determination of the expres-sion of nNOS and CAPON protein (using immuno-his-tochemisity)and mRNA (by RT-PCR)in the prefron-tal lobe.Results After the models of depression were established,the total distance,rearing number and the sucrose preference percentage (SPP)were decreased significantly compared with those before (P <0.05). There was no significant difference among all groups in the total distance,rearing number and the SPP before treatment (P >0.05 ).Compared with groups D and F,the total distance was prolonged,the number of rea-ring and SPP were significantly increased,the expres-sion of nNOS protein and mRNA was down-regulated and the expression of CAPON protein and mRNA was up-regulated in groups K and KF,with 3 days’treat-ment (P <0.05).Compared with group D,the total distance was prolonged,the number of rearing and SPP were significantly increased,the expression of nNOS protein and mRNA was down-regulated and the expres-sion of CAPON protein and mRNA was up-regulated in groups K,F and KF with 7 days’treatment (P <0.05).Compared with group F,the total distance was prolonged,the number of rearing and SPP were signifi-cantly increased,the expression of nNOS protein and mRNA was down-regulated and the expression of CA-PON protein and mRNA was up-regulated in group KF with 7 days’treatment (P <0.05).Conclusion Co-administration of antidepressant fluoxetine with ket-amine may induce a more pronounced antidepressant activity than treatment with each antidepressant alone and it can shorten the time to improve the depressive state through promoting the expression of CAPON and inhibiting nNOS activity in the prefrontal lobe of men-tally depressed rats.

Type B aortic dissection is a life-threatening aortic disease.With the development of clinical classification and diagnostic method,the mortality of type B aortic dissection has been greatly decreased.In respect of treatment,endovascular repair due to minimally invasive advantages become the first choice for the treatment of complicated type B aortic dissection.For non-complicated type B aortic dissection,endovascular repair also gradually replace drug treatment,and showed good efficacy.Open surgery is only available for patients who ate not suitable for endovascular repair or repair failure or patients with connective tissue disease.

Objective:To analyze the research hotspot of advance care planning (ACP) at home and abroad, understand the research status and development trend of this field, and provide reference for the development of ACP in China.Methods:The recently literature of ACP through PubMed and Wan Fang database was searched, then bibliographic information data mining system and graph clustering tool kit cluster analysis were used.Results:A total of 2 717 articles were retrieved, extracted high frequency keywords that account for more than 50% of the total, including 35 domestic subject words and 89 foreign "main subject words+ sub-subject words" . Domestic research hotspots included: culture and value of ACP and advance directives, implementation and implementation status of ACP, research progress of ACP, research of ACP acceptance, attitudes and status of medical staff about ACP and advance directives. Foreign research hotspots included: the role of advance directives in ACP and its evaluation and application, influencing factors of ACP selection preference in terminal patients, status and methods of agency decision making, ACP and hospice care, the impact of end-of-life choices on care and quality of life, auxiliary decision-making mode of ACP.Conclusions:Although relevant research on ACP in China has been in the exploratory stage, there is still a gap in the breadth and depth of research at home and abroad. Research forms, objects and contents of ACP need to be deepened. In the future, the research should actively explore the new mode of ACP development in combination with China′s policy and cultural background.

Objective To investigate the efficacy and clinical value of balloon-assisted clipping for the treatment of giant unruptured intracranial aneurysms of internal carotid artery. Methods Patients with giant unruptured intracranial aneurysm of intracranial segment of internal carotid artery treated with balloon-assisted clipping in the Department of Neurosurgery, Xiangya Hospital, Central South University from September 2017 to May 2018 were enrolled retrospectively. The proximal internal carotid artery or the aneurysm neck were temporarily blocked by balloon, and then the aneurysm was clipped in the hybrid operating room. Demographic data, preoperative symptoms, aneurysm characteristics, position of balloon placement, intraoperative angiography, complications, and follow-up results were collected. Results A total of 12 patients with giant (diameter >2 cm) unruptured intracranial aneurysm of intracranial segment of internal carotid artery were enrolled. They were all successfully clipped using balloon-assisted clipping in the hybrid operating room. Among them, 1 was located in the ophthalmic segment, 3 in the supraclinoid segment, 4 in the posterior communicating segment, 2 in the anterior choroidal artery segment, and 2 in the bifurcation of the internal carotid artery. The balloons were placed in the proximal end of internal carotid artery in 9 cases and in the neck of aneurysm in 3 cases. Intraoperative angiography showed that 12 aneurysms were completely occluded; 1 had severe stenosis of parent artery, and 1 had mild stenosis. Postoperative complications included cerebral infarction in 1 case, temporary diabetes insipidus in 1 case (returned to normal 1 week after operation), hemiplegia in 1 case, and epilepsy in 1 case. Glasgow Outcome Scale score at discharge showed 5 in 9 cases, 4 in 2 cases, and 3 in 1 case. The patients were followed up for 2.3 to 12 months after operation (median 7.5 months). Reexamination of CT angiography showed no recurrence of aneurysm. Glasgow Outcome Scale score was 5 in 11 cases and 4 in 1 case. Conclusions The use of balloon-assisted clipping technique in the hybrid operating room for the treatment of giant intracranial segmental aneurysms of the internal carotid artery is safe and effective, and has a good long-term outcome.

[ABSTRACT]AIM:Toinvestigatetheinteractionandthemechanismofsphingosine-1-phosphate(S1P)and phospholipid transfer protein (PLTP) in lipoprotein.METHODS:The S1P content in the plasma and lipoprotein from 10-week-old PLTP transgenic (PLTP-Tg) mice and wild-type (WT) mice (n=8 each) was assayed.The transport of S1P by PLTP was determined by S1P transfer assay.The content of specific S1P carrier, apolipoprotein M, was detected by West-ern blotting.RESULTS:Plasma S1P contents were decreased by 21.1%in PLTP-Tg mice compared with WT mice.S1P content in high-density lipoprotein ( HDL) fraction ( HDL-S1P) from PLTP-Tg mice was decreased by 35.1% compared with WT mice, whereas the S1P in low-density lipoprotein (LDL) fraction (LDL-S1P) was increased by 127.4%.The re-sults of S1P transfer assay indicated that PLTP facilitated S 1P transport from erythrocyte to recombinant liposome at 37℃in D-Hanks buffer solution .The plasma content of apolipoprotein M was not changed in PLTP-Tg mice compared with WT mice.CONCLUSION:PLTP is a key factor to maintain plasma HDL-S1P under physical condition .Overexpression of PLTP decreases the HDL-S1P but increases LDL-S1P.The mechanism might be related to the capability of PLTP on trans-ferring S1P from erythrocyte to lipoprotein.

Objective:To evaluate the efficacy and safety of physician-modified fenestration TEVAR for treating type B aortic dissection with unhealthy or short anchoring zone.Methods:Clinical data of patients with type B aortic dissection who received TEVAR for left subclavian artery fenesration from May 2016 to Dec 2018 were analyzed prospectively.Results:The technical success rate was 93.2%. One case was converted into chimney stenting. One case suffered type Ⅰendoleak. One case had type Ⅲ endoleak. There were no deaths or neurological complications during the perioperative period, and the mean hospital stay was 9.2 (5-26) days. The median follow-up time was 30 (12-42) months. One case developed type Ⅰ endoleak during follow-up. No retrograde dissection occurred and all LSA stents remained patent.Conclusion:Physician-modified fenestration TEVAR is safe and effective for the treatment of type B aortic dissection with unhealthy or short anchoring zone.

Objective To evaluate the diagnostic value of combined detection of serum autoantibodies against against p53 and Bmi-1 in lung cancer (LC).Methods Serum levels of autoantibodies against p53 and Bmi-1 were measured by enzyme-linked immunosorbent assay (ELISA) in 92 patients with LC and 80 normal controls.The combined diagnostic value was evaluated with the receiver operating characteristic (ROC) curve.Results The serum levels of autoantibodies against p53 and Bmi-1 were significantly higher in LC than in normal controls (0.438 ±0.705 vs 0.045 ±0.035,Z =-7.667,P ＜0.01;0.117±0.061 vs 0.068 ±0.031,Z =-7.179,P ＜0.01).The levels of autoantibodies against p53 and Bmi-1 were not related to age,gender,pathological classification,lymph node status or tumor-node-metastasis (TNM) stage (P ＞ 0.05).The combined detection of two autoantibodies provided an enhanced sensitivity of 63.0％,a specificity of 91.2％ and an area under curve (AUC) of 0.881,which showed better diagnostic efficiency compared to individual autoantibodies.Conclusions Combined detection of autoantibodies against p53 and Bmi-1 shows good diagnostic value,which may aid diagnosis of LC.