Page 7 - 南京医科大学学报自然科学版
P. 7
第43卷第10期 南京医科大学学报(自然科学版)
2023年10月 Journal of Nanjing Medical University(Natural Sciences) ·1333 ·
·基础研究·
A1 类清道夫受体通过促进 M2 型巨噬细胞极化增加脂肪组织
产热能力
张天天,李金杰,柏雪雅,柏 惠,陈 琪,朱旭冬 *
江苏省心血管病靶向干预研究重点实验室,南京医科大学基础医学院病理生理学系,江苏 南京 211166
[摘 要] 目的:探讨A1类清道夫受体(macrophage scavenger receptor 1,MSR1)在低温刺激诱导白色脂肪产热进程中的作用
+/+
-/-
及其机制。方法:正常饮食(common diet,CD)的野生型小鼠(MSR1 )和MSR1缺失表达小鼠(MSR1 )分别给予低温刺激1 d
或者 14 d 后,通过 qRT⁃PCR、Western blot 和免疫组织化学染色检测皮下白色脂肪组织(subcutaneous white adipose tissue,
scWAT)和棕色脂肪组织(brown adipose tissue,BAT)中脂肪产热能力标志物(UCP1、Cidea和Cox8b)的表达。qRT⁃PCR 和流式
-/-
+/+
细胞术检测正常饮食的MSR1 和MSR1 小鼠给予低温刺激14 d后,小鼠scWAT 中巨噬细胞极化情况。建立高脂饮食(high
fat diet,HFD)诱导的小鼠肥胖模型,监测CD和HFD 12周的MSR1 和MSR1 小鼠体重变化,并使用代谢笼监测小鼠耗氧量和
+/+
-/-
产热量变化;qRT⁃PCR和免疫组织化学染色检测HFD 12周的小鼠给予低温刺激7 d后,小鼠scWAT和BAT中产热基因表达。
体外实验应用巨噬细胞条件培养基刺激小鼠前脂肪细胞分化,待分化成熟后应用qRT⁃PCR检测产热基因表达。结果:慢性低
温刺激下,与MSR1 小鼠相比,MSR1 小鼠脂肪组织产热基因表达明显降低。进一步,MSR1 小鼠scWAT中M2型巨噬细胞
-/-
+/+
-/-
-/- +/+
数量明显减少。HFD 喂养 12 周后,MSR1 小鼠体重增加更为明显,并且耗氧量和产热量明显降低。低温刺激下,与 MSR1
HFD小鼠相比,MSR1 HFD小鼠脂肪产热能力明显降低。体外细胞研究发现,与MSR1 小鼠腹腔巨噬细胞条件培养基诱导
+/+
-/-
的成熟脂肪细胞相比,MSR1 小鼠腹腔巨噬细胞条件培养基诱导的成熟脂肪细胞产热基因表达明显降低。结论:低温刺激
-/-
下,MSR1通过增加M2型巨噬细胞极化促进小鼠脂肪组织产热。
[关键词] A1类清道夫受体;低温刺激;脂肪产热;巨噬细胞M2型极化
[中图分类号] R329.2 [文献标志码] A [文章编号] 1007⁃4368(2023)10⁃1333⁃09
doi:10.7655/NYDXBNS20231001
MSR1 increases the thermogenic capacity of adipose tissue by promoting the polarization
of M2 macrophages
*
ZHANG Tiantian,LI Jingjie,BAI Xueya,BAI Hui,CHEN Qi,ZHU Xudong
Key Laboratory of Targeted Intervention of Cardiovascular Disease,Department of Pathophysiology,School of Basic
Medicine,Nanjing Medical University,Nanjing 211166,China
[Abstract] Objective:This study aims to investigate the role and mechanism of macrophage scavenger receptor 1(MSR1)in the
process of white adipose thermogenesis induced by cold exposure. Methods:The expression of MSR1 and markers of the thermogenic
capacity of adipose(UCP1,Cidea,Cox8b)in subcutaneous white adipose tissue(scWAT)and brown adipose tissue(BAT)of wild type
-/-
+/+
mice(MSR1 )and MSR1 knockout mice(MSR1 )fed with common diet(CD)were detected by qRT ⁃ PCR,Western blot and
-/-
+/+
immunohistochemistry after 1 or 14 days of cold exposure. The polarization of macrophages in scWAT of MSR1 and MSR1 mice fed
with CD after 30 days of cold exposure were detected by qRT⁃PCR and flow cytometry. Obese mouse model was established by high fat
+/+ -/-
diet(HFD),the weight changes were monitored in MSR1 and MSR1 mice fed with CD or HFD for 12 weeks,and the metabolic cage
method was used to monitor the changes of O 2 consumption and heat production. The expression of thermogenic genes in scWAT and
BAT of mice fed with HFD for 12 weeks were detected by qRT⁃PCR and immunohistochemistry after 7 days of cold exposure. In vitro,
macrophage conditioned medium was used to stimulate the differentiation of mouse preadipocytes,and the expression of thermogenic
[基金项目] 国家自然科学基金(82170444);江苏省高等学校自然科学研究重大项目(20KJA310007)
∗
通信作者(Corresponding author),E⁃mail:zhuxudong@njmu.edu.cn