发现固有免疫记忆的适应性特征。

Discovering adaptive features of innate immune memory.

机构信息

Department of Medicine, McGill University Health Centre, McGill International TB Centre, Meakins-Christie Laboratories, McGill University, Montreal, Quebec, Canada.

Department of Microbiology & Immunology, McGill University Health Centre, McGill International TB Centre, Meakins-Christie Laboratories, McGill University, Montreal, Quebec, Canada.

出版信息

Immunol Rev. 2024 May;323(1):186-196. doi: 10.1111/imr.13328. Epub 2024 Apr 2.

Abstract

Conventionally, it was thought that innate immunity operated through a simple system of nonspecific responses to an insult. However, this perspective now seems overly simplistic. It has become evident that intricate cooperation and networking among various cells, receptors, signaling pathways, and protein complexes are essential for regulating and defining the overall activation status of the immune response, where the distinction between innate and adaptive immunity becomes ambiguous. Given the evolutionary timeline of vertebrates and the success of plants and invertebrates which depend solely on innate immunity, immune memory cannot be considered an innovation of only the lymphoid lineage. Indeed, the evolutionary innate immune memory program is a conserved mechanism whereby innate immune cells can induce a heightened response to a secondary stimulus due to metabolic and epigenetic reprogramming. Importantly, the longevity of this memory phenotype can be attributed to the reprogramming of self-renewing hematopoietic stem cells (HSCs) in the bone marrow, which is subsequently transmitted to lineage-committed innate immune cells. HSCs reside within a complex regulated network of immune and stromal cells that govern their two primary functions: self-renewal and differentiation. In this review, we delve into the emerging cellular and molecular mechanisms as well as metabolic pathways of innate memory in HSCs, which harbor substantial therapeutic promise.

摘要

传统上,人们认为先天免疫通过对损伤的简单非特异性反应系统起作用。然而,这种观点现在似乎过于简单化了。现在已经很明显,各种细胞、受体、信号通路和蛋白质复合物之间的复杂合作和网络对于调节和定义免疫反应的整体激活状态是至关重要的,先天免疫和适应性免疫之间的区别变得模糊不清。鉴于脊椎动物的进化时间线以及仅依赖先天免疫的植物和无脊椎动物的成功,免疫记忆不能被认为是淋巴细胞系的创新。事实上,进化的先天免疫记忆程序是一种保守的机制,通过这种机制,先天免疫细胞可以由于代谢和表观遗传重编程而对二次刺激产生更高的反应。重要的是,这种记忆表型的持久性可以归因于骨髓中自我更新造血干细胞(HSCs)的重编程,随后将其传递给谱系定型的先天免疫细胞。HSCs 存在于一个复杂的免疫和基质细胞调控网络中,该网络控制着它们的两个主要功能:自我更新和分化。在这篇综述中,我们深入探讨了先天免疫记忆在 HSCs 中的新兴细胞和分子机制以及代谢途径,这些机制具有很大的治疗潜力。

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