1.Effects of different positions on cerebral blood flow in patients undergoing laparoscopic surgery
Shuo WANG ; Liuyang YU ; Kai CHEN ; Guangzhi SHI ; Ruquan HAN
Chinese Journal of Anesthesiology 2017;37(4):420-422
Objective To evaluate the effects of different positions on cerebral blood flow in patients undergoing laparoscopic surgery.Methods Thirty patients of both sexes,aged 23-64 yr,of American Society of Anesthesiologists physical status Ⅰ or Ⅱ,scheduled for elective laparoscopic surgery,were included.Patients' position was changed using a random number table after induction of anesthesia.Patients were placed in the supine position and tilted 15° head-up or 15° head-down,and the parameters of the middle cerebral artery were monitored using the transcranial Doppler ultrasound.After admission to the operating room (baseline),after induction of anesthesia and before pneumoperitoneum,in the supine position,at head-up tilt and at head-down tilt,the mean blood flow velocity,pulsatility index,resistance index,mean arterial blood pressure (MAP) and heart rate were recorded.Results Compared with the baseline in the supine position,the MAP and bilateral mean blood flow velocity were significantly decreased at head-up tilt,and the MAP and bilateral pulsatility and resistance indices were significantly increased at head-down tilt (P<0.05).Conclusion During laparoscopic surgery,head-up tilt can lead to a decrease in cerebral blood flow,and head-down tilt exerts no effect on cerebral blood flow.
2.Research progress of asynchronous brain-computer interfaces based on alpha control technology
Lijuan SHI ; Liuyang XU ; Xinqi HE ; Yun ZHAO ; Juntang LIN ; Yi YU
International Journal of Biomedical Engineering 2017;40(1):62-64,后插1
Brain-computerinterface(BCI) is a kind of direct channel for information communication and control established between the human brain and computer or other electronic equipment.BCI is a novel information communication system which does not depend on the conventional brain information pathways.The asynchronous brain-computer interface technology is based on alpha wave control,and can automatically switch system mode between working and idle and select the larger EEG signal associated with motion imagination.In this paper,the basic knowledge of BCI and alpha wave-based asynchronous BCI technology were introduced.The key technology and application prospect of the novel alpha wave-based asynchronous BCI technology were summarized,and the status and existing problems were analyzed.
3.Matrine suppresses the growth of human chronic myeloid leukemia K562 cells via inhibiting bcr-abl-mediated MEK-ERK pathway
Liuyang HE ; Haijun ZHOU ; Xiao SUN ; Zhichao ZHU ; Yu BAI ; Lijia JIANG ; Xuzhang LU ; Min ZHOU ; Sixuan QIAN ; Jianyong LI ; Lingdi MA
Cancer Research and Clinic 2015;(7):433-437,444
Objective To investigate the mechanism of matrine in inhibition of proliferation the proliferation of human chronic myeloid leukemia (CML) K562 cells via MEK-ERK signaling pathway. Methods Western blot was used to detect the expression of MEK1, ERK1/2, Shc and SHP2 (the signal effect molecules of MEK-ERK pathway) in K562 cells. The transcription and translation of bcr-abl and target protein (bcl-xL, Cyclin D1, c-myc and p27) were detected by RT-PCR and Western blot. Results Matrine was able to significantly inhibit the phosphorylation of MEK1, ERK1/2, Shc and SHP2 in K562 cells and suppress the protein and mRNA expression of bcr-abl. Moreover, the expressions of bcl-xL, Cyclin D1 and c-myc were down-regulated significantly, while the expression level of p27 (a negative regulator of cell cycle progression) was increased markedly after matrine treatment. Conclusions Suppression of the growth of human CML K562 cells is related to the inhibition of bcr-abl-mediated MEK-ERK pathway activity. The down-regulation of phosphorylated proteins or protein kinases activity in signaling pathways might be an important molecular mechanism in control the activity of MEK-ERK pathway.
4.Inhibitory effect of PARP inhibitor olaparib on acute myeloid leukemia HL-60 cells
Zhichao ZHU ; Yu BAI ; Xuzhang LU ; Xiao SUN ; Liuyang HE ; Chunjian QI
Practical Oncology Journal 2019;33(6):481-485
Objective The inhibitory effect of the PARP inhibitor olaparib on human acute myeloid leukemia HL-60 cells was studied. Methods The HL-60 cells in logarithmic growth phase were treated with different concentrations(1. 25,2. 5,5 and 10 μmol/L) of olaparib for different time. The CCK-8 assay was used to detect the inhibitory effect of olaparib on HL-60 cells. The apoptotic level of HL-60 cells was detected by Annexin-V/PI double staining method,and the expression of related signal proteins ( PARP-1 and caspase-3)in HL-60 cells was detected by Western blot. Results HL-60 cells were inhibited by olaparib at dif-ferent concentrations(1. 25,2. 5,5 and 10 μmol/L) for 48 h,and the inhibition rate gradually increased with the prolongation of the action time;at the same time,the apoptotic rate was increased in HL-60 cells after olaparib treatment for 48 h,showing a dose-de-pendent manner;the PARP activity was inhibited and caspase-3 was activated in HL-60 cells treated with olaparib. Conclusion The PARP inhibitor olaparib not only inhibits proliferation of HL-60 cells,but it also promotes apoptosis of HL-60 cells by inhibi-ting PARP activity and activating caspase-3.
5.Long-term Helicobacter pylori Infection Does Not Induce Tauopathy and Memory Impairment in SD Rats
ZHOU HUAN ; GUO YING ; LI XING ; LIUYANG ZHENG-YU ; SHENTU YANG-PING ; JING XIAO-PENG ; LIANG JIA-WEI ; ZHOU XIN-WEN ; WANG XIAO-CHUAN ; WANG JIAN-ZHI ; ZENG JI ; LIU RONG
Journal of Huazhong University of Science and Technology (Medical Sciences) 2017;37(6):823-827
Helicobacter pylori (H.pylori) infection is a recognized risk factor of dementia,while its role and mechanism in Alzheimer disease (AD) remained unclarified.Our previous study has identified that injection of soluble H.pylori filtrate could induce AD-like pathologic changes and cognitive impairment in SD rats.In the present study,we further explored the effect of long-term stomach colonization of H.pylori bacteria on the brains of SD rats.The results showed that H.pylori bacteria gavage induced an efficient colonization of H.pylori in the stomach after four weeks.However,there was no significant change of tau phosphorylation at Thr205 (pT205),Thr231 (pT231),Ser396 (pS396) and Ser404 (pS404) sites in the hippocampus and cerebral cortex.The H.pylori-infected rats also showed no cognitive impairment.These observations may result from inefficient release of bacterial pathogenic factors or the overall lack of host inflammatory responses.We conclude that SD rat with long-term H.pylori colonization in the stomach is not a suitable animal model for exploring the effects of H.pylori infection on brain function in human beings;administration of bacterial filtrates may better reveal the systemic pathologic changes induced by bacterial infection in animals which show a negative host response to bacterial colonization.
6.Protective Effect of Total Ginsenoside Ginseng Root on Learning and Memory Impairment and Anxiety in Rats Induced by Hindlimb Suspension
Yu BAO ; Ying CHEN ; Gui-rong ZENG ; Zi-yu YANG ; Rui-le PAN ; Zhe SHI ; Qin HU ; Jing-wei LYU ; Cong LU ; Yang HE ; Ning JIANG ; Bo PENG ; Xin-min LIU ; Lian-kui WEN
Chinese Journal of Experimental Traditional Medical Formulae 2021;27(7):49-56
Objective:To investigate the effect of total ginsenoside ginseng root on the learning and memory impairment and anxiety of hindlimb suspension rats by detecting the performance of rats in the water maze, elevated plus maze, and the expression of hypothalamic-pituitary-adrenal (HPA) axis, inflammatory factors and tryptophan pathway related factors through the intervention of ginsenosides in hindlimb suspension rats. Method:The Wistar male rats were divided into normal group, hindlimb suspension model group, Huperzine A group (0.1 mg·kg-1), and total ginsenoside ginseng root low and high dose groups (100, 200 mg·kg-1), with 8 rats in each group. Except for the normal group, the rats in the other groups maintained a -30° hindlimb suspension state for 24 h. The normal group and the model group received intragastric administration of 10 mL·kg-1 pure water . After 28 days of continuous administration, the water maze and elevated plus maze behavioral tests were performed. After the tests, blood was taken from the abdominal aorta, and the rat brain cortex was peeled off on ice, quenched with liquid nitrogen, and stored at -80 ℃ for later use. LC-MS/MS was used to detect neurotransmitter levels of dopamine, acetylcholine, glutamate,