Changes and predictive value of degree centrality in patients with narcolepsy type 1 based on resting-state functional magnetic resonance imaging / 中华神经科杂志

Objective:To investigate the abnormal changes of the nodal centrality of the whole-brain network in patients with narcolepsy type 1 (NT1) through the degree centrality (DC) technique of resting-state magnetic resonance and the predictive value for NT1.Methods:From September 2019 to November 2021, 18 NT1 patients who were first diagnosed and never accepted managements and 18 age-, sex-matched healthy controls recruited by advertisement in the Second Affiliated Hospital of Nanchang University were required for resting-state functional magnetic resonance imaging scans and clinical scale assessment, including Epworth Sleepiness Scale (ESS), Self-rating Anxiety Scale, Self-rating Depression Scale, Pittsburgh Sleep Quality Index, Insomnia Severity Scale and Multidimensional Fatigue Inventory-20 (MFI-20). The differences in DC values between the NT1 patients and healthy controls were analyzed using the DC method. Then, the correlation between DC values in differential brain regions and clinical characteristics of NT1 was explored through Pearson correlation analysis. The receiver operating characteristic (ROC) curve analysis was used to evaluate the predictive value of the DC values in the differential brain regions for NT1 patients.Results:Compared with the healthy controls, the DC value of the right superior temporal gyrus was increased, while the DC values of the bilateral middle frontal gyrus and the right precuneus were decreased in the NT1 patients (all P<0.05, Gaussian random-field correction). The DC value of the right superior temporal gyrus in the NT1 patients was positively correlated with the ESS score ( r=0.82, P<0.001) and MFI-20 score ( r=0.48, P=0.040). The DC value of the right middle frontal gyrus was positively correlated with the disease course ( r=0.51, P=0.032). The ROC curve showed that the area under the curve of NT1 predicted by the DC value of the right superior temporal gyrus was 0.95. And the areas under the curve of non-NT1 predicted by the DC values of the left middle frontal gyrus, right middle frontal gyrus, and right precuneus were 0.86, 0.84 and 0.87, respectively. Conclusions:NT1 patients have abnormal resting-state DC in the default network, executive network core brain regions, and superior temporal gyrus. And the DC value in the right superior temporal gyrus may be a potential biomarker of NT1 patients.

Anti-neurexin-3α antibody-associated encephalitis with parkinsonism as the main manifestation: a case report / 中华神经科杂志

Anti-neurexin-3α antibody-associated encephalitis is rare in clinical practice. It often has a history of pre-infection. It is characterized by abnormal mental behavior, seizures, decreased consciousness, cognitive and sleep disorders, movement disorder, central hypoventilation and autonomic nervous dysfunction. Among them, dyskinesias are mainly involuntary movements of the mouth, face and limbs, dystonia, myoclonic seizures and other manifestations of increased movement. Parkinson′s symptoms manifested as decreased movement are rarely reported. A encephalitis patient with positive anti-neurexin-3α antibody is reported, who is a young female, mainly with parkinsonism such as slow movement, unsteady walking, difficulty in starting and turning around, and inability to hold things in both upper limbs, accompanied by abnormal mental behavior and cognitive dysfunction. After treatment with methylprednisolone and intravenous immunoglobulin, the prognosis is good.

Autoimmune encephalitis with double positive anti-N-methyl-D-aspartate receptor and dipeptidyl-peptidase-like protein-6 antibodies: a case report / 中华神经科杂志

Autoimmune encephalitis is a group of inflammatory diseases related to autoantibodies that affect the central nervous system. Early diagnosis of patients with autoimmune encephalitis has certain difficulties, because the clinical manifestations caused by different types of autoantibodies can be non-specific, and the presence of multiple autoantibodies can cause variation and superposition of clinical manifestations. The article reported a case of autoimmune encephalitis patients with double positive anti-N-methyl-D-aspartate receptor and dipeptidyl-peptidase-like protein-6 antibodies, and reviewed relevant literature for clinical reference.

Neuroprotective effect of extract of Ginkgo biloba against excitotoxicty compared with ginkgolide B in neuron cell of rat / 中国中药杂志

<p><b>OBJECTIVE</b>To observe the effect of the extract of Ginkgo biloba (EGb761) and the components isolated from the extract named ginkgolide B (GB) against damage of glutamate in pretreatment modes so that determine their application value and approach.</p><p><b>METHOD</b>Based on glutamate-induced excitotoxicity to primary cultures from neonatal Sprague-Dawley (SD) rat hippocampal neuron, our experiment utilized trypan blue, TUNEL and LDH to study the effect of EGb761 and GB on neuron in different doses pretreatment modes, as well as to compare with the NMDA receptor uncompetitive antagonist-MK-801.</p><p><b>RESULT</b>EGb761 and GB can recrease cell viability, reduce apoptosis rate and decrease LDH leakage in different degree and depended on dose in certain range. The maximal protection was achieved at a concentration of 100 mg x L(-1), 100 micromol x L(-1), but inferior to MK-801 (10 micromol x L(-1)). The protective effect of GB is superior to EGb761.</p><p><b>CONCLUSION</b>Treatment with EGb761 and GB could protect the neurons against glutamate-induced injury. The maximal protection of GB was achieved by pretreatment is superior to EGb761, so its precautionanary intervention to high-risk population could have more value.</p>

p75NTR expression in cultured hippocampal neurons during glutamate-induced excitotoxicity / 重庆医科大学学报

Objective:To observe the change in expression level ofp75NTR(p75 neurotrophin receptor)in cultured hippocampal neurons during glutamate-induced excitotoxicity.Methods:Excitotoxicity was induced by glutamate in rat cultured hippocampal neurons; RT-PCR and western blot were used to detect the change in expression level of p75NTR.Results:After glutamate exposure,p75NTR mRNA(P

Anti-NR_1 monoclonal antibody inhibits the glutamate-induced intracellular free calcium increase in rat hippocampal neurons / 基础医学与临床

Objective To study the effect of mAbN1,a monoclonal antibody against N-methyl-D-aspartate receptor subunit 1(NR1)on Ca2+ influx after glutamate stimulation in cultured rat hippocampal neurons.Methods Excitotoxicity was induced by glutamate in cultured hippocampal neurons.Confocal laser scanning microscopy was used to observe the changes in intracellular free calcium concentration([Ca2+]i)at the level of cultured hippocampal neurons following pretreatment with mAbN1 and MK-801.Intracellular free calcium was imaged after loading cells with the fluorescent dye indicator fluo-3/AM.Results Our findings indicate that as compared with MK-801,mAbN1 can more significantly attenuate the glutamate-induced [Ca2+]i increase,and it has no effect on [Ca2+]i in physiological condition.Conclusion mAbN1 may alter the secondary structure of NR,consequently influence Ca2+ influx in excitotoxicity process.

Effect of BRL-37344 on ion channel in guinea pig cardiac myocytes / 第三军医大学学报

Objective To study the biological effect of ?3 adrenoceptor-activated electrophysiological activities in cardiac myocytes. Methods Changes of transient outward potassium ( Ito) and L-type calcium current ( ICa-L) in primary cultured guinea pig cardiacmyocytes were detected with the standard whole-cell patch clamp technique about 5 -10 min before and after administration of ?3 adrenoceptor agonist,4--2-hydroxy-( 3-chlorophenyl) ethyl-aminopropylphenoxyacetate ( BRL-37344; BRL). Results BRL could significantly increased the Ito in guinea pig cardiac myocytes with the I-V curve up-moved. When the membrane potential reached to + 80 mV,the density current increased from 6. 11 ? 1. 03 pA/pF to 8. 46 ? 2. 07 pA/pF ( n = 6,P =0. 013 064). BRL ( 10 -6mol/L) could significantly increase the ICa-Lin guinea pig cardiac myocytes,which was ( 2. 30 ?0. 75) -fold higher than in control group( n =5,P =0. 0063). When the membrane potential increased to + 10 mV ,the current,increased from 89. 25 ? 17. 83 pA to 205. 00 ? 72. 24 pA ( n = 5,P = 0. 006 3). Conclusion BRL-37344 can increase the transient Itoand ICa-L,thus further regulating the cardiac activities.