体外光动力学反应调节角质形成细胞分泌细胞因子的研究

目的探讨不同强度光动力学反应对角质形成细胞（HaCat）分泌某些细胞因子的影响。方法将0．O～12．8mol／L的5-氨基酮戊酸（AI。A）与HaCat细胞共同培养，检测胞内原卟啉IX（PpIX）含量；经632．8nrfl激光照射后测定细胞死亡率。依据细胞死亡率（0％～10％）确定ALA浓度区间（0．0～1．6mmol／L），继而检测该区间内细胞（包括照射组与非照射组）上清液中白介素-1α（IL-1α）、IL-6、碱性成纤维细胞生长因子（bFGF）、内皮素一1（ET-1）和a肿瘤坏死因子（TNF—α）的水平。结果ALA浓度可调控胞内PpIX含量和光动力反应强度，在0．O～1．6mmol／L：区间与细胞死亡率（≤10％）呈线性正相关（rs=0．451，r2=0．606，P〈0．05），且IL—1α、bFGF和TNF-α水平随着ALA浓度增加而逐渐升高（皆P〈0．05），IL-6和ET-1水平则无显著变化（皆P〉0．05）。结论通过增强光动力反应可促进HaCat细胞分泌某些细胞因子，以提高对某些皮肤病的疗效。

Photodynamic reaction affects the production of certain cytokines derived from keratinocytes in vitro

Objective To investigate the effects of photodynamic reaction on cytokines production of HaCat keratinocytes treated with 5-aminolevulinic acid (ALA). Methods The HaCat cells were cocultured in vitro with different concentrations of ALA. Three hours later PpIX levels in HaCat cells were detected, and phtotodynamic reaction was induced by 632.8 nm laser radiation on cells. The cell death was analyzed using a flow cytometer to evaluate reactive intensity. The cytokines contents in supernatant were determined, including interleukin (IL)- lα, IL-6, basic fibroblast growth factor (bFGF), endothelin (ET)-1 and tumor necrosis factor (TNF)-α. Results Different cellular PpIX levels and cell death rates were seen according to ALA concentrations. The cell death rate did not exceed 10% and showed a positive linear relationship with ALA concentration (P＜0.05), when the later was at 0.0-1.6 mmol/L interval. The levels of IL-1α, bFGF and TNF-α increased as ALA concentration ascended at this interval (P＜0.05). No significant correlation was found between ALA concentration and IL-6 or ET-1 level (P＞0.05). Conclusion The photodynamic reactive intensity could be enhanced by increasing ALA concentration. And at certain scope, higher reactive grade might induce higher levels of keratinocyte-derived cytokines.