Zhu Xiaobao, Zhu Renzhong, Jian Zhiyuan, Yu Hong
Department of Gastrointestinal Surgery, Affiliated Hospital of Guilin Medical University, Guilin, China.
Second Department of General Surgery, Shengjing Hospital of China Medical University, Shenyang, China.
Cent Eur J Immunol. 2019;44(4):357-363. doi: 10.5114/ceji.2019.92784. Epub 2020 Jan 20.
The aim of the study was to investigate the effects of laminarin on natural killer (NK) cell cytotoxicity of immunosuppressive mice and its mechanism. Cyclophosphamide (cy) was used to make an immunosuppressive model of mice. The mice of two groups were given interventions by gavage with laminarin 500 mg/kg and 1000 mg/kg every day for 10 days. MACS was adopted to isolate spleen NK cells, and cytotoxicity of NK cells and IL-12, IFN-γ level in serum were detected in vivo. Cytotoxicity of NK92-MI cells, activating receptors (NKp30, NKp44, NKp46 and NKG2D) and perforin and granzyme B expression were detected in vitro. Compared to the normal control group, the cytotoxicity of NK cells, IL-12 and IFN-γ level in serum in the cy model group were all reduced significantly (p < 0.01). Compared to the cy model group, laminarin increased the cytotoxicity of NK cells, IL-12 and IFN-γ levels in serum significantly (p < 0.05). In vitro, laminarin increased the cytotoxicity, NKp30 and NKG2D, perforin and granzyme B expressions of NK92-MI cells (p < 0.01). This research showed that laminarin can promote NK cell cytotoxicity in immunosuppressive mice by increasing the levels of IL-12 and IFN-γ in serum and expressions of NKp30 and NKG2D, perforin and granzyme B.
本研究旨在探讨海带多糖对免疫抑制小鼠自然杀伤(NK)细胞细胞毒性的影响及其作用机制。采用环磷酰胺(Cy)建立小鼠免疫抑制模型。两组小鼠每天经口灌胃给予500mg/kg和1000mg/kg海带多糖,连续10天。采用磁珠分选法分离脾脏NK细胞,检测体内NK细胞细胞毒性及血清中IL-12、IFN-γ水平。体外检测NK92-MI细胞的细胞毒性、活化受体(NKp30、NKp44、NKp46和NKG2D)以及穿孔素和颗粒酶B的表达。与正常对照组相比,Cy模型组NK细胞细胞毒性、血清中IL-12和IFN-γ水平均显著降低(p<0.01)。与Cy模型组相比,海带多糖显著提高了NK细胞细胞毒性、血清中IL-12和IFN-γ水平(p<0.05)。体外实验中,海带多糖提高了NK92-MI细胞的细胞毒性、NKp30和NKG2D、穿孔素和颗粒酶B的表达(p<0.01)。本研究表明,海带多糖可通过提高血清中IL-12和IFN-γ水平以及NKp30和NKG2D、穿孔素和颗粒酶B的表达,促进免疫抑制小鼠NK细胞的细胞毒性。