Objective To study the changes of cytokines in aqueous humor of patients with proliferative diabetic retinopathy (PDR)after intravitreal bevacizumab (IVB) and the correlation of these cytokines.Methods Fifty-six patients(63 eyes) with severe PDR underwent pars piana vitrectomy (PPV) with IVB pretreatment in our hospital from April,2014 to February,2015 were collected.All the patients received IVB therapy from 3 days to 7 days before PPV.Aqueous humor samples were collected at the time of IVB and PPV treatment.The concentrations of vascular endothelial growth factor (VEGF),interleukin-6 (IL-6),interleukin-8 (IL-8) and monocyte chemotactic protein-1 (MCP-1) were measured by cytoinetric bead array (CBA).The changes of these cyto-kines after IVB were analyzed by using Wilcoxon rank sum test for paired data.The correlation between these cytokines was analyzed by using Spearman rank test.Results From 3 days to 7 days after IVB,the concentration of VEGF in aqueous humor was (6.57 ± 12.29)pg · mL-1,lower than the pre-operation of (278.71 ±340.20)pg · mL-1,the difference was statistically significant (P ＜ 0.05).The concentration of IL-8 was (385.60 ± 1099.47) pg · mL-1,higher than pre-operation of(298.87 ± 1005.79) pg ·mL-1,the difference was statistically significant (P ＜ 0.05).IL-6 and MCP-1 were increased after IVB,but the difference was not statistically significant (all P ＞ 0.05).VEGF,IL-6,IL-8 and MCP-1 had an obviously relationship between each two factors(all P ＜ 0.05).Conclusion Angiogenesis in patients with PDR are regulated by a variety of cytokines,and targeted reduction of VEGF may compensatory increase the concentration of other inflammatory cytokines.%目的 研究增生型糖尿病视网膜病变(proliferative diabetic retinopathy,PDR)患者玻璃体内注射贝伐单抗(intravitreal bevacizumab,IVB)后房水中细胞因子的变化情况及其相关性.方法 收集2014年4月至2015年2月在我院行玻璃体切割(pars plana vitrectomy,PPV)术联合术前3～7d给予IVB辅助治疗的严重PDR患者56例(63眼),分别于IVB及PPV术时收集两次房水,采用Cytometric Bead Array (CBA)方法测量房水中血管内皮生长因子(vascular endothelial growth factor,VEGF)、白细胞介素6(interleukin-6,IL-6)、白细胞介素8(interleukin-8,IL-8)及单核细胞趋化因子-1(monocyte chemotactic protein-1,MCP-1)的浓度;分析IVB后房水中细胞因子浓度变化及各细胞因子的相关性.结果 IVB后3～7d,房水中VEGF浓度为(6.57±12.29)pg·mL-1,较术前(278.71±340.20)pg·mL-降低,差异具有统计学意义(P ＜0.05);IL-8浓度为(385.60±1099.47) pg·mL-1,较术前(298.87±1005.79)pg·mL-1升高,差异具有统计学意义(P ＜0.05);IL-6及MCP-1浓度均高于术前,但差异均无统计学意义(均为P＞0.05).VEGF、IL-6、IL-8及MCP-1各细胞因子两两之间均存在明显的相关性(均为P＜0.05).结论 PDR患者新生血管的生成过程可能是由多种细胞因子调节,针对性降低VEGF浓度可以代偿性引起其他细胞因子浓度的升高.
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