背景热疗是一种安全的辅助治疗方法,通过抑制肿瘤细胞DNA修复、促进其凋亡、提高机体免疫等作用阻碍其发生、发展。但是,对于热疗是否可以通过干预巨噬细胞间接影响肿瘤细胞的研究并不多。
目的通过体外模拟热疗产生的温热作用,探讨在热疗条件下M2型肿瘤相关巨噬细胞对肺癌细胞(LLC)的调控作用。
方法本研究于2019年6—12月实施。10 000 ng/L的干扰素γ(INF-γ)和100 000 ng/L的脂多糖(LPS)诱导RAW264.7细胞48 h成为M1型巨噬细胞,20 000 ng/L白介素(IL)-4诱导RAW264.7细胞48 h成为M2型巨噬细胞;通过流式细胞术和ELISA法分别检测M1、M2巨噬细胞表面标志抗原CD 86、CD 206的表达率和细胞因子IL-10、IL-12的分泌水平;采用CCK-8法检测不同热疗温度(41 ℃、42 ℃、43 ℃)干预对M2型巨噬细胞在24 h、48 h和72 h的增殖活性作用;采用实时荧光定量聚合酶链反应法(RT-PCR)检测M0、M2型巨噬细胞及热疗(42 ℃)后M2型巨噬细胞Arg-1、Fizz-1、Ym-1 mRNA相对表达水平;Western blotting法检测M2型巨噬细胞及热疗(42 ℃)后M2型巨噬细胞Arg-1、Fizz-1、Ym-1蛋白相对表达水平;Transwell法检测LLC+M2、LLC+M2+热疗(42 ℃)中LLC的侵袭、迁移能力。
结果IFN-γ和LPS可诱导RAW264.7细胞向M1型极化,IL-4可诱导RAW264.7细胞向M2型转化。流式细胞术检测结果显示,M2型巨噬细胞CD 86、CD 206的表达率高于M0型巨噬细胞和M1型巨噬细胞( P<0.001)。ELISA法检测结果显示,M2型巨噬细胞IL-10的分泌水平较M0、M1型巨噬细胞高( P<0.001);M1型巨噬细胞IL-12分泌水平较M0、M2型巨噬细胞高( P<0.001)。CCK-8法检测结果显示,42 ℃时热疗抑制巨噬细胞的能力高于41 ℃及43 ℃时( P<0.001)。RT-PCR检测结果显示,与M0型巨噬细胞相比,M2型巨噬细胞的Ym-1、Arg-1、Fizz-1 mRNA相对表达水平升高( P<0.001)。热疗(42 ℃)后M2型巨噬细胞的Ym-1、Arg-1 mRNA和蛋白相对表达水平降低( P<0.001)。Transwell法检测结果显示,M2型巨噬细胞与LLC共培养后LLC侵袭、迁移数量增加( P<0.001);热疗(42 ℃)后LLC侵袭、迁移数量减少( P<0.001)。
结论热疗可能通过下调M2型巨噬细胞的Arg-1、Ym-1 mRNA的表达水平从而抑制LLC的侵袭与迁移能力。
BackgroundHyperthermia is a safe adjuvant therapy that can suppress the occurrence and progression of tumor cells by inhibiting DNA repair, promoting cell apoptosis and improving immunity. However, little is known about whether hyperthermia can indirectly affect tumor cells by interfering with macrophages.
ObjectiveThis study aimed to examine the regulatory efficacy of M2 macrophages on lung cancer cells (LCCs) under in vitro hyperthermia.
MethodsThis study was implemented from June to December, 2019. RAW264.7 cells were stimulated with interferon-γ (INF-γ, 10 000 ng/L) +lipopolysaccharide (LPS, 100 000 ng/L) , and interleukin-4 (IL-4, 20 000 ng/L) for 72 h to induce M1 and M2 macrophages, respectively. The expression of surface antigens CD 86 and CD 206 in M1 and M2 macrophages were evaluated by flow cytometry. Secretion levels of IL-10 and IL-12 were measured by ELISA. Then, CCK-8 assay was used to detect the proliferation inhibition of M2 macrophages at 24, 48 and 72 h after hyperthermia at different temperatures of 41℃, 42℃ and 43℃. Real-time polymerase chain reaction (RT-PCR) and Western blotting were performed to determinethe mRNA and protein expression of Arg-1, Fizz-1 and Ym-1 in M0 macrophages, M2 macrophages and M2 macrophagesafter hyperthermia (42 ℃) , respectively. Transwell assay was utilized to measure the invasion and migration abilities of LCCsin LCCs+M2 and LCCs+M2+42℃ hyperthermia groups.
ResultsIFN-γ+LPS-and IL-4-induced RAW264.7 cells were successfully transformed into M1 and M2 macrophages, respectively. Flow cytometry results showed that the expressions of CD 86 and CD 206 in M2 macrophages were higher than those in M0 and M1 macrophages ( P<0.001) . ELISA results revealed that the secretion level of IL-10 in M2 macrophages was higher than that of M0 and M1 macrophages ( P<0.001) . The secretion level of IL-12 in M1 macrophages was higher than that of M0 and M2 macrophages ( P<0.001) . Besides, we also found that the inhibition level of macrophages by hyperthermia at 42℃ was higher than that at 41℃ and 43℃ ( P<0.001) . RT-PCR results showed that M0 macrophages, the mRNA expressions of Ym-1, Arg-1 and Fizz-1 in M2 macrophages were increased ( P<0.001) . But the mRNA and protein expressions of Ym-1 and Arg-1 in M2 macrophages were decreased after hyperthermia (42 ℃, P<0.001) . In addition, compared with LCCs+M2 group, hyperthermia (42 ℃) significantly decreased the invasion and migration abilities of LCCs ( P<0.001) .
ConclusionIn summary, hyperthermia may inhibit the invasion and migration of LCCs by downregulating the mRNA expression of Arg-1 and Ym-1 in M2 macrophages.
RAO Z Q, LIU J, CHEN B L, et al. Effect of hyperthermia on M2 polarization of macrophages and invasion and migration of lung cancer cells: an in vitro experimental study [J] . Chinese General Practice, 2021, 24 (17) : 2207-2213.
饶紫琦,刘菁,陈炳林,等. 热疗对巨噬细胞M2极化作用及其对肺癌细胞侵袭、迁移影响的体外实验研究[J]. 中国全科医学,2021,24(17):2207-2213.
DOI:10.12114/j.issn.1007-9572.2021.00.518本刊2021年版权归中国全科医学杂志社所有
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基因 | 引物方向(5' → 3') | 引物长度(bp) |
---|---|---|
GAPDH | 5'-GACTTCAACAGCAACTCCCACTC-3' | 107 |
5'-TAGCCGTATTCATTGTCATACCAG-3' | ||
Arg-1 | 5'-GCATATCTGCCAAAGACATCGT-3' | 123 |
5'-CAATCCCCAGCTTGTCTACTTCA-3' | ||
Fizz-1 | 5'-CCTGCTGGGATGACTGCTA-3' | 146 |
5'-TGGGTTCTCACCTCTTCAT-3'' | ||
Ym-1 | 5'-GGCAAAGGTCATGGAGATGT-3' | 179 |
5'-CTGCAGTCTCCATCACGAAA-3' |
注:A为M0型巨噬细胞,B为M1型巨噬细胞,C为M2型巨噬细胞
Macrophages morphology in different activation states
注:A为M0型巨噬细胞,B为M1型巨噬细胞,C为M2型巨噬细胞
CD 86 expression of different activated macrophages
注:A为M0型巨噬细胞,B为M1型巨噬细胞,C为M2型巨噬细胞
CD 206 expression of different activated macrophages
注:IL=白介素;与M0型巨噬细胞比较, a P<0.05;与M1型巨噬细胞比较, b P<0.05
The secretion levels of IL-10 and IL-12 in macrophages under different activation states
注:热疗为42 ℃;与M0型巨噬细胞比较, a P<0.05;与M2型巨噬细胞比较, b P<0.05
Relative expression of M0 macrophages,M2 macrophages and M2 macrophages after hyperthermia related factors
注:A为蛋白表达条带,B为蛋白的相对表达量,热疗为42 ℃;与M2型巨噬细胞比较, a P<0.05
M2 macrophages and M2 macrophages after hyperthermia related proteins
注:A为细胞侵袭结果(结晶紫染色,×200),B为侵袭结果的柱状图;LLC=肺癌细胞;与LLC比较, a P<0.05
The effect of M2 macrophages on invasion ability of LCCs
注:A为细胞侵袭结果(结晶紫染色,×200),B为侵袭结果的柱状图,热疗为42 ℃;与LLC+M2比较, a P<0.05
The effect of hyperthermia on invasion ability of LCCs
注:A为细胞迁移结果(结晶紫染色,×200),B为迁移结果的柱状图;与LLC比较, a P<0.05;
The effect of M2 macrophages on migration ability of LCCs
注:A为细胞迁移结果(结晶紫染色,×200),B为迁移结果的柱状图;与LLC+M2比较, a P<0.05;热疗为42 ℃
The effect of hyperthermia on migration ability of LCCs饶紫琦,刘菁,陈炳林,等.热疗对巨噬细胞M2极化作用及其对肺癌细胞侵袭、迁移影响的体外实验研究[J].中国全科医学,2021,24(17):2207-2213.[www.chinagp.net]
饶紫琦进行文章的构思与设计,数据收集,统计学处理,结果的分析与解释,撰写论文;刘菁进行研究的实施与可行性分析;陈炳林进行数据整理;邓永然进行论文的修订;刘文其负责文章的质量控制及审校,对文章整体负责,监督管理。

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