小鼠不同脂肪组织对冷应激的适应性反应
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南京医科大学附属逸夫医院

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江苏省自然科学基金;江苏省高校自然科学研究项目-面上项目


The adaptive responses of different adipose tissues to acute cold stress in mice
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    摘要:

    目的:明确C57BL/6J小鼠不同脂肪组织对于冷刺激的适应性应答的相似点与差异。方法:建立冷刺激组及对照组小鼠模型,测量体重、进食量等;HE染色观察各脂肪组织切片形态;荧光定量PCR法检测棕色化、线粒体功能等相关基因表达变化;Western Blot检测产热等相关蛋白表达情况;IHC染色检测脂肪组织交感神经支配;流式细胞术分析脂肪组织中巨噬细胞的分型。结果:与皮下及附睾白色脂肪相比,棕色脂肪组织的产热相关基因解偶联蛋白1表达量最高,但冷刺激不能进一步促进其表达;而冷刺激能够显著诱导皮下脂肪组织中产热基因和蛋白的表达。冷刺激能够促进棕色脂肪和皮下脂肪中交感神经支配和巨噬细胞M2型极化。结论:冷刺激能够诱导皮下脂肪组织棕色化,同时促进交感神经支配和巨噬细胞的M2型极化;冷刺激能够促进棕色脂肪组织中交感神经支配和巨噬细胞M2型极化;冷刺激对内脏白色脂肪组织的影响在三种脂肪组织中最小。

    Abstract:

    Objective: To clarify the similarities and differences of adaptive responses of different adipose tissue in C57BL/6J mice to cold stress. Methods: Mice were divided into two groups, the control group which were housed under room temperature individually and the cold stress group were housed under 6℃. Body weight, food intake and adipose tissue weight were measured. Adipose tissue morphology were observed by HE staining. The genes related to browing, mitochondrial function were quantified by qRT-PCR. The proteins related to thermogenesis were detected by western blot.Adipose tissue sympathetic innervation was shown by IHC staining. And macrophages polarization were tested by flow cytometry. Results: Thermogenic gene Ucp-1 expression were most abundant in brown adipose tissues but could not be promoted by cold. By contrast, thermogenic gene expression could be stimulated by cold stress in subcutaneous white adipose tissue in both mRNA and protein levels. Simultaneously, sympathetic innervation and macrophages M2 polarization could be induced in both brown and subcutaneous white adipose tissue but not in epididymal white adipose tissue. Conclusion: Cold stress could promote sympathetic innervation and macrophage M2 polarization in subcutaneous white adipose tissue which could induced browning. The responses to cold in brown adipose tissue were mild. And cold stimulation has minimal role in regulating visceral white adipose tissues regarding themogenic gene expression and macrophage polarization.

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  • 收稿日期:2022-02-11
  • 最后修改日期:2022-03-24
  • 录用日期:2022-05-31
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