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Articles by L Zou
Total Records ( 2 ) for L Zou
  J Wang , L Zou , S Huang , F Lu , X Lang , L Han , Z Song and Z. Xu

To clarify the role of glutathione S-transferases (GSTs; GSTM1 and GSTT1) status in susceptibility to coronary heart disease (CHD), a meta-analysis of published studies was performed. A total of 19 studies including 8020 cases and 11 501 controls were included in this meta-analysis. In a combined analysis, the relative risks for CHD of the GSTM1 null and GSTT1 null polymorphisms were 1.47 [95% confidence interval (CI): 1.08–2.01] and 1.26 (95% CI: 0.90–1.75), respectively. Three potential sources of heterogeneity including ethnicity, source of control and sample size of study were also assessed. However, no significant association was found in stratified analyses. By pooling data from eight studies (2909 cases and 3745 controls) that considered combinations of GSTT1 and GSTM1 genotypes, a statistically significant increased risk for CHD [odds ratio (OR = 2.38, 95% CI: 1.03–5.48)] was detected for individuals with combined deletion mutations in both genes compared with positive genotypes. Results from the meta-analysis of five studies on GSTs stratified according to smoking status showed an increased risk for individuals with null genotype (OR = 2.21, 95% CI: 1.24–3.92 for GSTM1 and OR = 3.29, 95% CI: 1.49–7.26 for GSTT1) versus non-null genotypes. This meta-analysis suggests that the GSTM1 null genotype may slightly increase the risk of CHD and that interaction between unfavourable GSTs genotypes may exist.

  Y Feng , L Zou , R Si , Y Nagasaka and W. Chao

Myeloid differentiation factor 88 (MyD88), an adaptor critical for innate immune function, plays a role in neutrophil recruitment and myocardial injury after transient ischemia. However, how MyD88 signaling modulates neutrophil function and myocardial injury remains unclear. In an in vivo model of neutrophil migration and a chimeric model of MyD88 deletion, we demonstrated that Gr-1-positive (Gr-1+) neutrophil migration was significantly decreased by 68% in MyD88-deficient (Myd88–/–) mice and by 33% in knockout->wild-type (KO->WT; donor->recipient) chimeric mice, which lacked MyD88 in bone marrow cells but maintained normal MyD88 expression in the heart. This marked attenuation in neutrophil migration was associated with decreased peritoneal neutrophil CXCR2 expression and lower peritoneal KC, a neutrophil chemoattractant, in MyD88–/– mice. Moreover, in vitro, KC induces significantly more downregulation of CXCR2 expression in MyD88–/– than WT neutrophils. In an in vivo model of myocardial ischemia-reperfusion (I/R) injury, KO->WT chimeric mice had significantly smaller infarct sizes compared with the WT->WT mice. While there was a marked increase in proinflammatory cytokine/chemokine expression in the myocardium following I/R, there was no significant difference between WT->WT and KO->WT mice. In contrast, Gr-1+ neutrophil recruitment in the myocardium was markedly attenuated in MyD88–/– mice. Deletion of Toll-interleukin-1 receptor (TIR)-domain-containing adaptor protein-inducing interferon-β-mediated transcription factor (Trif), another innate immune adaptor, had no effect on the KC-mediated CXCR2 downregulation or on myocardial neutrophil recruitment after I/R. Taken together, these findings suggest that MyD88 signaling is essential for maintaining neutrophil migratory function and chemokine receptor expression. MyD88 signaling in bone marrow-derived circulating cells may play a specific and critical role in the development of myocardial I/R-induced injury.

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