4.5 Review

ILC1: Development, maturation, and transcriptional regulation

期刊

EUROPEAN JOURNAL OF IMMUNOLOGY
卷 53, 期 2, 页码 -

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WILEY
DOI: 10.1002/eji.202149435

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cytotoxicity; development; discovery and characterization; effector maturation; ILC1s; innate lymphoid cells; transcriptional regulation

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This review discusses the recent advances in the development, differentiation, and effector maturation of ILC1s, as well as the observed heterogeneity in ILC1 populations within different tissues. The study of transcriptional programs reveals the shared characteristics between ILC1s and other tissue-resident lymphocytes, aiding in the effective response of ILC1s to tissue-invading pathogens.
Type 1 Innate Lymphoid cells (ILC1s) are tissue-resident cells that partake in the regulation of inflammation and homeostasis. A major feature of ILC1s is their ability to rapidly respond after infections. The effector repertoire of ILC1s includes the pro-inflammatory cytokines IFN-gamma and TNF-alpha and cytotoxic mediators such as granzymes, which enable ILC1s to establish immune responses and to directly kill target cells. Recent advances in the characterization of ILC1s have considerably furthered our understanding of ILC1 development and maintenance in tissues. In particular, it has become clear how ILC1s operate independently from conventional natural killer cells, with which they share many characteristics. In this review, we discuss recent developments with regards to the differentiation, polarization, and effector maturation of ILC1s. These processes may underlie the observed heterogeneity in ILC1 populations within and between different tissues. Next, we highlight transcriptional programs that control each of the separate steps in the differentiation of ILC1s. These transcriptional programs are shared with other tissue-resident type-1 lymphocytes, such as tissue-resident memory T cells (T-RM) and invariant natural killer T cells (iNKT), highlighting that ILC1s utilize networks of transcriptional regulation that are conserved between lymphocyte lineages to respond effectively to tissue-invading pathogens.

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