Research progress on the effectiveness of smallpox vaccination against mpox virus infection / 中华流行病学杂志

With the expansion of mpox virus infection from endemic to a global epidemic in 2022, the WHO declared that the mpox event constituted a Public Health Emergency of International Concern. Due to the high degree of gene sequence similarity among orthopox viruses and cross-reactive antibodies induced by orthoviruses, smallpox vaccination may affect the immune response induced by mpox virus infection. The analysis of the protective effects of smallpox vaccination against mpox virus infection will help define the focus of prevention and control. In this review, we clarify the protection of the smallpox vaccine against mpox virus infection by analyzing the correlation between smallpox vaccination, immune response status, and clinical data and providing evidence for the prevention, control, and strategies of mpox epidemics.

Clinical analysis of 97 Cases of Children Infecting with Epstein -Barr Virus / 中国基层医药

Objective To analyze the clinical characteristics of children infecting with Epstein -Barr virus. And in purpose to improve the knowledge of children infecting with Epstein -Barr virus.Methods We analyzed retrospectively to 97 cases of children which serodiagnosis of Epstein -Barr virus infectius in the aspects of the onset season,the age,clinical characteristics.And compared with complication group and no complication group in the aspects of the white cell count,neutrophils to white cell count ratio,lymphocyte to white cell count ratio and C -reactive protein.And contrasted the presence of statistical difference.Results The peak months were spring and summer(58 cases);Pre -school age was the peak age of EBV infectious(41 cases),and the rest respectively were toddlers age(33 cases),school age and youth(20 cases)and infant period(3 cases).The most frequently clinical manifestation respectively was pharyngitis,and other such as fever,lymphadenopathy,hepatosplenomegaly.There had no statistical difference in the two groups of complication group and no complication group in the aspects of the white cell count,neutrophils to white cell count ratio,lymphocyte to white cell count ratio and C -reactive protein(P >0.05).Conclusion The infant can suffer from infectious mononucleosis infect with EBV.Infectious mononucleosis have a variety of clinical manifestation,which always have some complications.The diognosis should combinate clini-cal manifestation with laberatory test.

The comparisons on total RNA from different source-original neurons applied in LMPC / 神经科学通报·英文版

Objective To compare the quality and quantity of total RNA from different source-original neurons applied in LMPC technique. Methods (1) Aglient 2100 bioanalyzer and RT-PCR were used to check the concentration and fragmentation of total RNA from unfixed, temporal fixed and fixed 12 h hypothalamus sections; (2) Different neurons of PVN and SON were collected by LMPC, CRH, TRH, AVP, OT mRNA level were measured by RT-PCR; (3) Labeled neurons by injecting CTB into stomach and non-labeled neurons in DMV collected by LMPC were checked for house keeping genes by RT-PCR. Results (1) Unfixed section had higher concentration and better quality of total RNA compared with fixed sections applied in LMPC; relative short amplicons such as GAPDH, NSE, MCH and MC4R were successfully obtained from fixed and unfixed and long amplicon of GR can only be obtained from unfixed material; (2) In mangocellular PVN and SON the expressions of AVP and OT were more special than those in the parvocellular PVN. Oppositely, the expressions of CRH, TRH in the parvocellular were more special than the other two; (3) The expressions of house keeping genes had no significant difference between labeled and non-labeled DMV neurons. Conclusion The quality and quantity of total RNA from unfixed brain tissues were better than fixed tissues applied in LMPC and the CTB tracer which may differentiate neurons had no significant effect on physiology of the neurons applied in LMPC. The results showed that the LMPC technique is suitable for the qualitative and quantitative study on individual neurons at mRNA level.

Interaction of 5-HT2 and 5-HT3 receptor subtype in 5-HT-induced nociceptive responses in peripheral primary sensory nerve ending / 中国应用生理学杂志

<p><b>AIM</b>To study the correlation between 5-HT-induced pain response and the contribution by individual 5-HTR subtypes including 5-HT1R, 5-HT2R and 5-HT3R at the level of peripheral primary afferent.</p><p><b>METHODS</b>The experiments were done on acutely isolated trigeminal ganglion (TG) neurons using whole-cell patch clamp technique and the nociceptive effect was observed on behavior experiments by intraplantar injection of test drugs.</p><p><b>RESULTS</b>The majority of cells examined responded to 5-HT in a manner of concentration dependence (10(-6) - 10(-3) mol/) (61.4%, 54/88) and with a fast activating and rapid desensitizing inward current (I(5-HT)), which was thought to be mediated by the activation of 5-HT3R, since it could be blocked by 5-HT3R antagonist ICS 205930 and mimicked by 5-HT3R agonist 2-methyl-5-HT. It was found that I(5-HT) was potentiated by 5-HT2R agonist alpha-methyl-5-HT markedly, while 5-HT1R agonist R-(+)-UH 301 did not. In behavioral experiment performed on conscious rats, intraplantar injection of 5-HT(10(-5), 10(-4) and 10(-3) mol/L) induced an increment of cumulative lifting time first 20 min in a manner of concentration dependence. By dissociating 5-HTR subtypes using their corresponding antagonists (ICS and CYP) the potency order of hindpaw lifting time was identified as follows: 5-HT > 5-HT + ICS > 5-HT + CYP.</p><p><b>CONCLUSION</b>The results suggest that in 5-HT-induced nociceptive response at the primary sensory level 5-HT3R may play a role of initiation, but 5-HT2R mediates maintaining and modulatory effect in the processes of nociceptive information convey.</p>

Effect of electroacupuncture at "Neiguan" (PC 6) on expression of c-fos gene in myocardium of the rat with acute myocardial ischemia / 中国针灸

<p><b>OBJECTIVE</b>To explore the mechanism of electroacupuncture at "Neiguan" (PC 6) improving acute myocardial ischemia.</p><p><b>METHODS</b>The rats were randomly divided into a sham operation group, a myocardial ischemia model group and a myocardial ischemia model plus electroacupuncture group. The acute myocardial ischemia model was developed byligation of the descending anterior branch of the coronary artery, and electroacupuncture was given at bilateral "Neiguan" (PC 6). Serum myocardial enzymes was determined by biochemical method and the expression of c-fos mRNA in myocardium was detected by using reverse transcription polymerase chain reaction (RT-PCR).</p><p><b>RESULTS</b>The activities of serum myocardial enzymes and the expression of c-fos mRNA in ischemic myocardium were significantly increased as compared with those in the sham operation group (P < 0.05), and after electroacupuncture they were significantly decreased (P < 0.05).</p><p><b>CONCLUSION</b>The mechanism of electroacupuncture at "Neiguan" (PC 6) improving acute myochadial ischemia is possibly related with down-regulation of expression of c-fos mRNA in myocardium.</p>

Opposite modulatory effects of substance P on GABA-and 5-HT-activated currents in the same sensory neurons / 生理学报

The modulation by substance P of gamma-aminobutyric acid (GABA)- and 5-hydroxytryptamine (5-HT)-activated currents (I(GABA) and I(5-HT)) was studied by using patch-clamp technique in rat trigeminal ganglion (TG) neurons. The majority of neurons examined responded to GABA and 5-HT with inward currents in the same cells (63.8%, 30/47). In 22 out of 30 neurons sensitive to both GABA and 5-HT, pretreatment with substance P (SP, 0.01 micromol/L) suppressed I(GABA) by (35.7 +/-6.1)% and enhanced I(5-HT) by (65.2 +/- 8.7)%. GR 82334, a potent and specific antagonist of NK1 tachykinin receptor, reversibly blocked the modulatory effects of SP. The SP modulation on I(GABA) and I(5-HT) was also abolished by intracellular dialysis of GDP-beta-S, a non-hydrolyzable GDP analog, or GF 109203X, a selective protein kinase C inhibitor. These results suggest that SP exerts opposite modulatory actions on GABA(A) receptor and 5-HT3 receptor activity of the same primary sensory neuron via the same intracellular signal transduction pathway.

The Influence of Fibrin on the Reaction of Plasminogen Activation by Mut ant of Pro-Urokinase / 生物化学与生物物理进展

Because the influence of fibrin on the reaction of plasm inogen activation by various plasminogen activators is different, the kinetic co nstant of the reaction of plasminogen activation catalyzed by InB with and witho ut fibrin were detected. The result is: Kfibrinm＝4.2 μmol*L -1，greater than the normal Km=0.379 μmol*L-1; kfib rincat＝0.107 s-1，greater than the normal kcat=0.0165 s-1. The results suggest that existence of fibrin in the reaction system of plasminogen activation depress the affinity between InB and plasminog en, but accelerates the hydrolysis of plasminogen by InB. The count up effect is inhibition.

Characterization of Bifunctional Chimeric Molecule of PRGDWR Containing Pro-Urokinase / 生物化学与生物物理进展

In order to obtain the bifunctional chimeric molecule of single-chain urokinase-type plasminogen activator (scu-PA) which can inhibit platelet aggregation, PRGDWR peptide was inserted into the site between Gly 118 and Leu119 (called insertion mutant B, InB). The recombinant gene of InB was expressed by Pichia pastoris. The secreted protein was purified by metal chelate affinity and strong cation exchange chromatography. The amidolytic ability of mutant InB is 5 900 IU/mg, the kinetic constants is: KInB m,plg=56.8 μmol*L-1，kInBcat,plg=0.33 s- 1. The kinetic constants of plasminogen activation reaction is: KInB m,plg=0.397 μmol*L-1，kInBcat,plg=0.0164 s-1. Fibrin inhibit the catalytiv ability of InB during plasminogen activatio n, the influence factor is 0.463(means InB remain 46.3% of the catalytic abili ty when fibrin was involved in the reaction system). The mutant not only has alm ost the same catalytic ability as wild type scu-PA, but also has strong ability of anti-platelet aggregation(compared with scu-PA), IC50 of InB is 12.7 μmol*L-1.