晚期糖基化终产物对大鼠血管平滑肌细胞分泌炎症性趋化因子的影响及机制

目的 观察晚期糖基化终产物(AGE)对血管平滑肌细胞(VSMC)分泌单核细胞趋化蛋白1(MCP-1)和白细胞介素8(IL-8)的影响并初步探讨可能的细胞内信号转导机制.方法 分离、培养原代大鼠VSMC并进行鉴定.采用糖基化血清白蛋白(GSA)模拟AGE,观察不同浓度GSA(10、100和500 μg/ml)对VSMC分泌MCP-1和IL-8的影响和时间曲线;并对其进行细胞增殖率校正以消除VSMC数量增加对测定的影响;p38MAPK抑制剂(SB203580)、ERK1/2抑制剂(PD98059)及NF-κB抑制剂(PDTC)、Proteasome抑制剂(MG132)预处理后观察GSA刺激VSMC分泌MCP-1和IL-8水平的改变.结果 与空白对照组相比,100 μg/ml GSA作用24 h VSMC分泌MCP-1(13.01ng/ml±0.12ng/ml比7.02 ng/ml±0.26 ng/ml,P＜0.05)和IL-8(12.6ng/ml±0.86 ng/ml比3.07 ng/ml±0.35ng/ml,P＜0.05)水平最高.经过细胞增殖校正后,GSA仍然能够促进VSMC表达MCP-1和IL-8.MAPK抑制剂和NF-κB抑制剂预处理后发现PDTC(10 μmol/L)、SB203580(5 μmol/L)以及MG132(10 μmol/L)可以抑制GSA刺激VSMC表达MCP-1和IL-8.结论 GSA可以促进VSMC分泌致炎性趋化因子MCP-1和IL-8,这种作用独立于细胞增殖,可能是通过激活细胞内p38MAPK信号转导通路,促进核因子NF-κB的活化而实现.

Abstract：

Objective To investigate the effects of advanced glycation end products (AGEs) on the secretion of monocyte chemoattractant protein-1 (MCP-1) and interleukin-8 (IL-8) in vascular smooth muscle cells (VSMCs) and explore its possible intracellular signaling mechanism. Methods Primary rat VSMCs were isolated and identified. VSMCs were treated with glycation serum albumin (GSA), an important component of AGEs, in series of concentrations and time. The role of MAPK and NF-κB inhibitors was confirmed. The levels of MCP-1 and IL-8 were determined by enzyme-linked immunosorbent assay (ELISA). Results VSMCs were treated with GSA at the doses of 10 μg/ml, 100 μg/ml and 500 μg/ml respectively. In comparison with the control group, the levels of MCP-1 ( 13.01 ng/ml ± 0.12 ng/ml vs 7. 02 ng/ml ±0. 26 ng/ml, P＜0.05) and IL-8 (12. 6 ng/ml ±0. 86 ng/ml vs 3. 07 ng/ml ±0.35 ng/ml,P＜0.05) increased in the GSA-treated group, especially at the concentration of 100 μg/ml. After adjustment for cells proliferation, the levels of MCP-1 and IL-8 were still higher in the GSA-treated group.After a pretreatment of PDTC ( 10 μmol/L), SB203580 (5 μmol/L) and MG132 ( 10 μmol/L), the levels of MCP-1 and IL-8 decreased. However, it had no change when pretreated with PD98059 (20 μmol/L).Conclusion GSA promotes the secretion of MCP-1 and IL-8 in VSMCs. Such an effect is not dependent on cellular proliferation. It may be realized through an activation of NF-κB by p38MAPK-sensitive intracellular signaling pathway.

Effects of advanced glycation end products on the secretion of proinflammatory chemokines in vascular smooth muscle cells

Objective To investigate the effects of advanced glycation end products (AGEs) on the secretion of monocyte chemoattractant protein-1 (MCP-1) and interleukin-8 (IL-8) in vascular smooth muscle cells (VSMCs) and explore its possible intracellular signaling mechanism. Methods Primary rat VSMCs were isolated and identified. VSMCs were treated with glycation serum albumin (GSA), an important component of AGEs, in series of concentrations and time. The role of MAPK and NF-κB inhibitors was confirmed. The levels of MCP-1 and IL-8 were determined by enzyme-linked immunosorbent assay (ELISA). Results VSMCs were treated with GSA at the doses of 10 μg/ml, 100 μg/ml and 500 μg/ml respectively. In comparison with the control group, the levels of MCP-1 ( 13.01 ng/ml ± 0.12 ng/ml vs 7. 02 ng/ml ±0. 26 ng/ml, P＜0.05) and IL-8 (12. 6 ng/ml ±0. 86 ng/ml vs 3. 07 ng/ml ±0.35 ng/ml,P＜0.05) increased in the GSA-treated group, especially at the concentration of 100 μg/ml. After adjustment for cells proliferation, the levels of MCP-1 and IL-8 were still higher in the GSA-treated group.After a pretreatment of PDTC ( 10 μmol/L), SB203580 (5 μmol/L) and MG132 ( 10 μmol/L), the levels of MCP-1 and IL-8 decreased. However, it had no change when pretreated with PD98059 (20 μmol/L).Conclusion GSA promotes the secretion of MCP-1 and IL-8 in VSMCs. Such an effect is not dependent on cellular proliferation. It may be realized through an activation of NF-κB by p38MAPK-sensitive intracellular signaling pathway.