摘要
目的:探讨IL-17D调控CD93^(+)CTL在肺脏肿瘤微环境(TME)中的杀伤功能及桔梗(PG)的促进作用。方法:采用PG或IL-17D处理小鼠肺脏B16黑色素瘤模型和对照小鼠,观察肺脏肿瘤克隆形成;应用单细胞测序、免疫荧光染色、流式细胞术等方法检测肿瘤小鼠肺脏IL-17D表达变化;采用单细胞测序、流式细胞术等方法分别检测各组小鼠肺脏CD93^(+)CTL含量、细胞表型和功能因子改变(包括CD107a、穿孔素、颗粒酶B、趋化因子CCL2、CXCL9及趋化因子受体CCR2、CXCR3等);利用EL4细胞系,采用Western blot、RT-PCR检测桔梗皂苷D对IL-17D及其转录调控因子NRF2表达的作用。结果:小鼠肺脏CD93^(+)CTL较CD93−CTL高表达穿孔素、CD107a等细胞毒性效应因子和趋化因子受体CXCR3、CCR2等,而颗粒酶B分泌能力无显著差异;小鼠肺脏肿瘤模型中,肺脏IL-17D表达及其CD93^(+)CTL含量明显下降(P<0.001);肿瘤小鼠经IL-17D回补实验,或经PG处理10 d后,肺脏IL-17D和CD93^(+)CTL比例和数量明显增多(P<0.05),肿瘤克隆明显减少。同时,肿瘤局部CD93^(+)CTL募集和功能相关细胞因子CCL2、CXCL9、IL-17D等表达明显上调。PG对IL-17D的上调作用在EL4细胞系体外实验中也得到了验证,桔梗皂苷D可显著上调EL4细胞IL-17D及其转录调控因子NRF2表达。结论:中药PG及其提取物可上调肺脏IL-17D表达,增强肺脏CD93^(+)CTL浸润和杀伤功能,拮抗肿瘤在肺脏的恶性进展,是PG改善肺脏TME的重要药理机制。
Objective:To investigate mechanisms of IL-17D on cytotoxic function of CD93^(+)CTL in lung tumor microenvironment(TME)and promotion of Platycodon grandiflorum(PG).Methods:Lung of B16 melanoma model mice and control mice were treated with PG or IL-17D,and lung tumor clone formation was observed.IL-17D expression change in lung was detected by single cell sequencing,immunofluorescence staining and flow cytometry.Single cell sequencing and flow cytometry were used to detect CD93^(+)CTL content,cytotoxic phenotype and functional factors changes,including CD107a,perforin,granzyme B,chemokine CCL2,CXCL9 and their ligand CCR2 and CXCR3.Western blot and RT-PCR were used to detect effect of Platycodonopsis saponin D on IL-17D and its transcriptional regulator NRF2 expressions in EL4 cells.Results:Pulmonary CD93^(+)CTL highly expressed cytotoxic effectors such as perforin and CD107a and chemokine receptors CXCR3 and CCR2 than CD93−CTL,while there was no significant difference in secretion of granzyme B.In mouse lung tumor model,pulmonary IL-17D and CD93^(+)CTL were significantly decreased(P<0.001);in tumor-bearing mice after IL-17D backfill assay,or after 10 days of treatment with PG,proportion and absolute number of IL-17D and CD93^(+)CTL in lungs were significantly increased(P<0.05),and tumor clones were significantly reduced;meanwhile,tumor-local expressions of cytokines CCL2,CXCL9,which are related to recruitment and function of CD93^(+)CTL,and IL-17D were significantly upregulated.Up-regulation of IL-17D and its transcriptional regulator NRF2 by PG was verified in vitro experiments on EL4 cell line by PD.Conclusion:Traditional Chinese medicine PG and its extracts can up-regulate expression of IL-17D in lungs,improve infiltration and cytotoxic function of CD93^(+)CTL and antagonize malignant progression of lung tumors,this is an important pharmacological mechanism of PG in improving immune TME of tumors in lung.
作者
杨雯越
张庆国
张珊
王悦
王丽
姚成芳
YANG Wenyue;ZHANG Qingguo;ZHANG Shan;WANG Yue;WANG Li;YAO Chengfang(School of Clinical and Basic Medicine,Shandong First Medical University(Shandong Academy of Medical Sciences),Jinan 250117,China)
出处
《中国免疫学杂志》
CAS
CSCD
北大核心
2024年第5期925-930,938,共7页
Chinese Journal of Immunology
基金
国家自然科学基金面上项目(82074088)
山东省重点研发计划重大科技创新工程项目(2022CXGC020514)。