目的:探索人树突状细胞(DCs)在不同分化阶段的生物力学特性。方法:收集人外周血单个核细胞来源的CD14+单核细胞,利用重组人白介素-4(rh IL-4)和重组人粒细胞巨噬细胞集落刺激因子(rh GM-CSF)共同诱导分化为未成熟DCs(im DCs),再利用重组人干扰素-γ(rh IFN-γ)和脂多糖(LPS)诱导im DCs分化成熟为DCs(m DCs);利用原子力显微镜(AFM)检测DCs的杨氏模量,采用细胞渗透脆性实验检测DCs的未破碎细胞百分率。结果:在55 m Osm/kg溶液中,m DCs抗低渗溶液的能力较im DCs差,差异有统计学意义(P〈0.05);m DCs的杨氏模量高于im DCs,差异有统计学意义(P〈0.001)。结论:在DCs不同分化阶段,im DCs的可塑性高于m DCs,形变能力更强,抗低渗溶液的能力更强。
Objective: To study the biomechanical characteristics of human dendritic cells (DCs) in different differentiation stages. Methods: CD14 + peripheral blood mononuclear cells were induced to imDCs by recombinant human interleukin-4 (rhIL-4) and recombinant human granuloeyte-maerophage colony-stimulating factor (rhGM-CSF) , and then induced to mDCs by recombinant human interferon γ (rhIFN-γ) and lipopolysaccharide (LPS) . The Young' s modulus of DCs were measured by atomic force microscope (AFM) ; the percentage of non-breaking cells was determined by osmotic fragility test under different osmotic pressure to test osmotic fragility of DCs. Results: In 55 mOsm/kg solution, the ability of mDCs to resist hypotonic solution was lower than that of imDCs ( P 〈 0.05 ) ; The Young' s modulus of mDCs were higher than that of imDCs (P 〈 0. 001 ). Conclusions: In different differentia- tion stages of DCs, the plasticity of imDCs is higher than that of mDCs, imDCs have a stronger deform- ation capability and hypotonic resistance capability.