To investigate the effect of thiopental sodium on the release of glutamate and gamma-aminobutyric acid (GABA) from synaptosomes in the prefrontal cortex, synaptosomes were made, the spontaneous release and the evoked release by 30 mmol/L KCl or 20 micromol/L veratridine of glutamate and GABA were performed under various concentrations of thiopental sodium (10-300 micromol/L), glutamate and GABA concentrations were determined by reversed-phase high-performance liquid chromatography. Our results showed that spontaneous release and evoked release of glutamate were significantly inhibited by 30 micromol/L, 100 micromol/L and 300 micromol/L thiopental sodium, IC50 of thiopental sodium was 25.8 +/- 2.3 micromol/L for the spontaneous release, 23.4 +/- 2.4 micromol/L for KCl-evoked release, and 24.3 +/- 1.8 micromol/L for veratridine-evoked release. But GABA spontaneous release and evoked release were unaffected. The study showed that thiopental sodium with clinically related concentrations could inhibit the release of glutamate, but had no effect on the release of GABA from rats prefrontal cortical synaptosomes.
Glutamic Acid/*metabolism ; Hypnotics and Sedatives/pharmacology ; Prefrontal Cortex/*metabolism ; Rats, Sprague-Dawley ; Synaptosomes/*metabolism ; Thiopental/*pharmacology ; gamma-Aminobutyric Acid/*metabolism

Aim To investigate the effect of thiopental sodium on the release of glutamate and GABA from synaptosomes of rats prefrontal cortex. Methods Synaptosomes were made from rats prefrontal cortex and incubated with artificial cerebral and spinal fluid (aCSF), then divided into five groups: group base release (Base), group thiopental sodium 10 ?mol?L -1 (THS 10), group thiopental sodium 30 ?mol?L -1 (THS 30), group thiopen tal sodium 100 ?mol?L -1 (THS 100) and group thiopental sodium 300 ?mol? L -1 (THS 300). Various concentrations of thiopental sodium were added to aC SF, the release of glutamate and GABA were performed under 37℃ and measured using reversed-phase high-performance liquid chromatography (RP-HPLC). When Ca 2+-independent release of glutamate and GABA were studied, Ca 2+ was omitted from aCSF.Results Compared with Base, thiopental sodium 30 , 100 and 300 ?mol?L -1 inhibited Ca 2+-dependent release of gluta mate evoked by KCl or veratridine significantly (P

Objective To investigate the effect of thiopental sodium (TPS) on spontaneous and KCl-evoked glutamate release from prefrontal cortical synaptosomes in rats and the effect of bicuculline on this effect ofTPS.Methods SD rats of both sexes (200-250 g) were decapitated and brains were removed. The prefrontalcortex was dissected and added to ice-cold sucrose solution and homogenized. The homogenate was centrifuged at1000 g at 0℃-4℃ for 5 min. The supernatant was again centrifuged at 12 000 g for 20 min. The sediment wascrude synaptosomes, which was added to artificial cerebro-spinal fluid (ACSF). The crude synaptosomes weredivided into 5 groups (n = 8): control group and 4 TPS groups. In control group no TPS was added while in TPSgroups different concentrations of TPS was added and the final concentration of TPS was 10, 30, 100, 300?mol?L~(-1) respectively. The synaptosomes were then placed with or without KCl in water bath at 37℃ for 15 min. Thespontaneous or KCl-evoked glutamate release was measured using high-performance liquid chromatograph (HPLC).In another set of experiment bicuculline 0. 1 mmol?L~(-1) was added to ACSF in each group before 15 min water bathto see if it could antogonize the effect of TPS on glutamate release. Results TPS 30, 100 and 300 ?mol?L~(-1)could significantly inhibit the spontaneous or KCl-evoked glutamate release compared with control group (P0.05). Bicuculline 0. 1 mmol?L~(-1) had no effect on the glutamate release in control group but could antagonize the inhibitory effect of TPS on glutamate release. Afteraddition of bicucculline the glutamate released in control group was not significantly different from that in the TPSgroups.Conclusion TPS sodium can inhibit the spontaneous or KCl-evoked glutamate release from prefrontalcortical synaptosomes in a concentration-dependent manner. The inhibitory effect is mediated by GABA_A receptors.

AIM: To investigate the dynamic changes of ATPases and NOS activities and NO production at different anesthesia phases using thiopental and propofol andifferent anesthetic phases (induction, anesthesia, restoration, and awake), the activities of NOS and ATPase and NO production in cortex and brain stem were meagroup. RESULTS: Ca2+ -ATPase and Na+ ,K+ -ATPase activities in the cortex and brain stem were significantly decreased after administration ofthiopental and propofol,especially at induction, anesthesia, or even restoration phase of thiopental group (P＜0.05, P＜0.01) and at anesthesia phase of propofol group (P＜0.05). NOS activities and NO production decreased from induction to restoration phase with thiopental and propofol anesthesia (P＜0.01). The parameters were returned near to the normal at awaken phase. CONCLUSION: Activities of ATPases and NOS and the production of NO may mediate the anesthesia effects of thiopental and propofol in the rat cortex and brain stem.

Objective To explore the values of various surgical techniques in the treatment of secondary hepatocarcinoma.Methods One hundred thirty-four patients with secondary hepatocarcinoma were respectively divided into three groups,hepatectomy(group Ⅰ), other surgical treatments(group Ⅱ) and chemotherapy or/and interventional therapy(group Ⅲ). Retrospective analysis was performed to all patients above mentioned.The three groups were compared each other for survival rate.Results The survival rate among three groups was significantly different.There was a higher survival rate in hepatectomy group.Conclusions Hepatectomy is the most effective method to cure secondary hepatocarcinoma.

Background: The prevalence of ulcerative colitis (UC) in China has significantly increased in recent years,and Toll-like receptor 4 (TLR4) may be closely related to the development of UC.Aims: To study the effect of vitamin D3 on expression of TLR4 in the intestinal mucosa in colitis model in rats.Methods: Thirty Sprague-Dawley rats were randomly divided into normal control group,model group and vitamin D3 group.Rats in model group and vitamin D3 group were given trinitro-benzene-sulfonic acid (TNBS) to induce colitis model.Rats in vitamin D3 group were given vitamin D3.HE staining was performed,and disease activity index (DAI) and colon histopathological score were evaluated,the expression of TLR4 was measured by immunohistochemistry.Results: Compared with normal control group,DAI and histopathological score in model group were significantly increased (P＜0.05),and expression of TLR4 was significantly increased (P＜0.05).After giving vitamin D3,DAI and histopathological score were significantly decreased (P＜0.05),and expression of TLR4 was significantly decreased (P＜0.05).Conclusions: The expression of TLR4 is increased in colon tissue in colitis model in rats,which may be involved in the pathogenesis of UC.Vitamin D3 can alleviate intestinal inflammation via inhibiting expression of TLR4,thereby playing a role in the adjunctive therapy of UC.

Objective To study the expressions of SKP2 and p27 in gastric carcinoma and pericancerous tissues and to detect the relationship between their expressions and clinicopathological features. Methods Forty-nine cases of gastric carcinoma spicemen and 20 cases of tissue adjacent to the carcinoma were cut and made into paraffin-embedded slices. The expressions of SKP2 and p27 were then detected by SP immunohistochemical method. Results The positive expression rate and score of SKP2 were both significantly higher in the gastric carcinoma tissues than those in pericancerous tissues (P

In view of the characteristics of the learning curve for medical students,the ' three phases and seven steps' case-based learning model was designed and implemented by Changzheng Hospital,the Second Military Medical University.This model was carried out in the theoretical study stage,the first round of internship and the second round of internship.Cases of single diseases,multiple diseases involving variant systems and a variety of diseases involving different department were enrolled for analysis and discussion.Implementation of each case study was divided in seven procedures:determining learning objective and choosing typical case,studying case and raising questions,panel discussions and establishment of common problems,looking up for information to answer questions and preparing report slide,large group discussions,summary and evaluation.'Three phases and seven steps' case based learning model ensure the width and depth of basic medical knowledge learned by the students.With the practice of this model,the basic medical knowledge was constructed systemically and comprehensively by medical students.Students' abilities of problem-analyzing and problem-solving as well as clinical research were developed.This model was effective according to our practice and was worth spreading out.

To investigate the effect of propofol on the release of glutamate and gamma-aminobutyric acid (GABA) from rat hippocampal synatosomes, synaptosomes was made from hippocampus and incubated with artificial cerebrospinal fluid (aCSF). With the experiment of Ca(2+)-dependent release of glutamate and GABA, dihydrokainic acid (DHK) and nipectic acid were added into aCSF. For the observation of Ca(2+)-independent release of glutamate and GABA, no DHK, nipectic acid and Ca2+ were added from aCSF. The release of glutamate and GABA were evoked by 20 micromol/L veratridine or 30 mmol/L KCI. The concentration of glutamate and GABA in aCSF was measured by using high-performance liquid chromatography (HPLC). 30, 100 and 300 micromol/L propofol significantly inhibited veratridine-evoked Ca(2+)-dependent release of glutamate and GABA (P < 0.01 or P < 0. 05). However, propofol showed no effect on elevated KCl-evoked Ca(2+)-dependent release of glutamate and GABA (P > 0.05). Veratridine or elevated KCI evoked Ca(2+)-independent release of glutamate and GABA was not affected significantly by propofol (P > 0.05). Propofol could inhibit Ca(2+)-dependent release of glutamate and GABA. However, it has no effect on the Ca(2+)-independent release of glutamate and GABA.
Anesthetics, Intravenous/pharmacology ; Calcium/metabolism ; Glutamic Acid/*biosynthesis ; Hippocampus/*metabolism ; Propofol/*pharmacology ; Rats, Sprague-Dawley ; Synaptosomes/*metabolism ; gamma-Aminobutyric Acid/*biosynthesis

Objective To explore the clinical efficacy of transanal specimen extraction in modified Da Vinci robot-assisted anterior resection of rectosigmoid tumor.Methods The retrospective cross-sectional study was conducted.The clinicopathological data of 47 patients who underwent Da Vinci robot-assisted anterior resection of rectosigmoid tumor using transanal specimen extraction in the Second Xiangya Hospital of Central South University from March to October 2016 were collected.Excisional intestinal canal was intraoperatively taken out from the anus instead of abdominal minor incision.Observation indicators:(1) operation and postoperative recovery;(2)postoperative pathological examination situations;(3) follow-up.Follow-up using outpatient examination and telephone interview was performed to detect postoperative survival of patients and tumor recurrence or metastasis up to June 2017.Measurement data with normal distribution were represented as (x)±s.Results (1) Operation and postoperative recovery:47 patients underwent successful operations,without conversion to open surgery.Of 47patients,8 underwent coloanal ultralow anastomosis,3 underwent prophylactic terminal ilenm stoma fistulization and 1 underwent intersphincteric resection after turning inside out resectable specimen.Operation time,volume of intraoperative blood loss,time for out-of-bed activity,time to anal exsufflation and time of postoperative drainagetube removal were (222±73)minutes,(21±9)mL,(1.7-±0.8)days,(2.3±l.0)days and (6±5)days,respectively.Among 3 patients with postoperative complications,2 with anastomotic fistula were cured by conservative treatment,and 1 with urinary retention removed urethra catheter at 4 weeks postoperatively.All the 47 patients had good recovery,and duration of hospital stay was (10±4)days.(2) Postoperative pathological examination situations:number of lymph node dissected was 15-± 7,with R0 resection.Tumor pathological diagnosis:rectosigmoid adenocarcinoma was detected in 38 patients (1 with high-differentiated tumor,32 with moderate-differentiated tumor and 5 with low-differentiated tumor),mixed carcinoma in 4 patients,tubulovillous adenoma in 2 patients,mucinous adenocarcinoma in 1 patient,neuroendocrine carcinoma in 1 patient and focal cacinoma in 1 patient.The maximum diameter of tumor was (3.5± 1.5) cm.Postoperative pathological T stage:4,9,18 and 14 patients were detected in stage T1,T2,T3 and T4a.Postoperative pathological N stage:30,8 and 7 patients were detected in stage N0,N1 and N2.Postoperative pathological TNM stage:stage Ⅰ,Ⅱ and Ⅲ were respectively in 11,19 and 15 patients.There was no clinical stage in 2 patients with tubulovillous adenoma.(3) Follow-up:of 47 patients,42 were followed up for 7-15 months,with a median time of 11 months.During the follow-up,38 patients had tumor-free survival,3 had tumor recurrence or metastases and 1 died.Conclusion Transanal specimen extraction is safe and feasible in modified Da Vinci robot-assisted anterior resection of rectosigmoid tumor,with minimal invasion and satisfactory short-term outcomes.