Objective To investigate the expression of chemokine ligand 2 (CCL2)in chronic uric acid nephropathy(CUAN)and its diagnostic values in kidney damage.Methods 29 patients with CUAN[male 23,female 6,age (44.4 ±8.8)years old ]and 35 health individuals[male 27,female 8,age (40.6 ±7.8 )years old ]were involved in this study.Serum and peripheral blood mononuclear cells were isolated from peripheral blood.CCL2 was assayed by ELISA,and CD +45 /CD +14 monocytes were analyzed by flow cytometry.Liver &kidney functions,lipids and glucose were detected by automatic biochemistry analyzer.Results Serum CCL2 in group of CUAN and health con-trols were 456.2(202.6 -594.9)pg/mL and 245.0(132.2 -544.5)pg/mL,respectively(F =4.915,P =0.030). Percentages of monocytes in each group were 7.4%(5.6% -8.7%)and 6.1%(4.7% -7.9%),(F =8.891,P =0.004).Pearson analysis found that levels of CCL2 positively correlated with percentages of monocytes,serum uric acid and creatinine in CUAN group(r values were 0.535,0.584 and 0.012;P values were 0.003,0.001 and 0.012, respectively),but there was no correlation with urea and retinol binding protein(r value were 0.145 and 0.746,P val-ues were 0.453 and 0.453).Conclusion Hyperuricaemia may directly contribute to elevate levels of CCL2 and facilitate monocytes release into inflammation part to induce kidney damage.

Objective To investigate the correlation between immune inflammation and overactivity of T helper cells in childhood asthma by cell proliferation assay and activation induced cell death in vitro.Methods Th1/Th2/Th17 cytokines were determined by cytometric bead array.Cell proliferation and activation induced cell death were detected when CD4+ T cells were purified by magnetic beads and stimulated by PHA and antiCD3.At last,mRNA of Fas,FasL and Bcl-2 were mesured by real-time PCR.Results Cytokines of IL-4(2.451± 1.052ng/L vs 1.796 ±0.615 ng/L,P =0.018),IL-10( 1.920 ±0.813ng/L vs 1.390 ±0.162ng/L,P =0.006)and TNF(5.112 ±5.842 ng/L vs 1.506 ±0.551 ng/L,P =0.009) in sera of asthma group were higher than those in control group.Compared to control group,proliferation ability of CD4 + T cells in asthma group was greater ( OD450:0.498 ± 0.052 vs 0.274 ± 0.032,P ＜ 0.001 ) and apoptosis rate was lower( 35.62 ± 0.05 ％ vs 65.28±3.85％,P ＜0.001 ).mRNA expression of Fas in asthma group was lower but Bcl-2 was higher than those in control group.Conclusion It is implicated that defective expression of Fas and over expression of Bcl-2 in CD4+ T cells may contribute to apoptosis inhibition and cell proliferation,which could explain overeactivity of CD4 + T cells and lvmphocvte infiltration in childhood asthma.

Objective:Based on an investigation of an outbreak of COVID-19 in Nanchang, to understand the transmission process, analyze the infectivity of the cases in incubation period and asymptomatic carrier, and evaluate the transmission risks in different exposures.Methods:Case investigation was based on the traditional epidemiological survey, combined with analysis based on big data about population movement trajectories. Transmission chain was identified to indicate transmission relationship.Results:A total of 27 cases were found in this cluster epidemic, including 25 confirmed cases, 1 suspected case (index case) and 1 asymptomatic carrier. A total of 347 close contacts were found. The secondary attack rate was 7.2% (25/347). The infection rates in close contacts of the first, second, third and fourth generation cases were 52.6% (10/19), 6.1% (13/213), 2.3% (2/88) and 0.0% (0/27), respectively. Asymptomatic carrier caused household transmission. The infection rates in close contacts after having meals, sharing rooms/beds, having work contacts, having neighbor contacts, having same time medical services or sharing wards and sharing vehicles with the patients were 10.6%(17/160), 10.0%(20/201), 5.3%(5/94), 0.0%(0/30), 0.0%(0/18) and 0.0%(0/17), respectively.Conclusions:The infection source of this cluster epidemic was a suspected case from Wuhan. Analysis based on big data about population movement trajectories can help to search the cases and close contacts accurately. The proposed epidemic prevention and control measures based on this investigation were effective.