The early neutrophil-committed progenitors aberrantly differentiate into immunoregulatory monocytes during emergency myelopoiesis

Inflammatory stimuli cause a state of emergency myelopoiesis leading to neutrophil-like monocyte expansion. However, their function, the committed precursors, or growth factors remain elusive. In this study we find that Ym1+Ly6Chi monocytes, an immunoregulatory entity of neutrophil-like monocytes, a...

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Published inCell reports (Cambridge) Vol. 42; no. 3; p. 112165
Main Authors Ikeda, Naoki, Kubota, Hiroaki, Suzuki, Risa, Morita, Mitsuki, Yoshimura, Ayana, Osada, Yuya, Kishida, Keigo, Kitamura, Daiki, Iwata, Ayaka, Yotsumoto, Satoshi, Kurotaki, Daisuke, Nishimura, Koutarou, Nishiyama, Akira, Tamura, Tomohiko, Kamatani, Takashi, Tsunoda, Tatsuhiko, Murakawa, Miyako, Asahina, Yasuhiro, Hayashi, Yoshihiro, Harada, Hironori, Harada, Yuka, Yokota, Asumi, Hirai, Hideyo, Seki, Takao, Kuwahara, Makoto, Yamashita, Masakatsu, Shichino, Shigeyuki, Tanaka, Masato, Asano, Kenichi
Format Journal Article
LanguageEnglish
Published United States Elsevier Inc 28.03.2023
Elsevier
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Summary:Inflammatory stimuli cause a state of emergency myelopoiesis leading to neutrophil-like monocyte expansion. However, their function, the committed precursors, or growth factors remain elusive. In this study we find that Ym1+Ly6Chi monocytes, an immunoregulatory entity of neutrophil-like monocytes, arise from progenitors of neutrophil 1 (proNeu1). Granulocyte-colony stimulating factor (G-CSF) favors the production of neutrophil-like monocytes through previously unknown CD81+CX3CR1lo monocyte precursors. GFI1 promotes the differentiation of proNeu2 from proNeu1 at the cost of producing neutrophil-like monocytes. The human counterpart of neutrophil-like monocytes that also expands in response to G-CSF is found in CD14+CD16− monocyte fraction. The human neutrophil-like monocytes are discriminated from CD14+CD16− classical monocytes by CXCR1 expression and the capacity to suppress T cell proliferation. Collectively, our findings suggest that the aberrant expansion of neutrophil-like monocytes under inflammatory conditions is a process conserved between mouse and human, which may be beneficial for the resolution of inflammation. [Display omitted] •Mouse neutrophil-like monocytes arise from proNeu1 during emergency myelopoiesis•G-CSF favors a differentiation of proNeu1 into CD81+CX3CR1lo monocyte precursors•Human CXCR1+CD14+CD16− monocytes also expand in response to G-CSF treatment•Human neutrophil-like monocytes suppress the proliferation of T cells Ikeda et al. find that immunoregulatory monocytes expand in response to G-CSF during emergency myelopoiesis. Unlike classical monocytes that differentiate from monocyte-dendritic cell progenitors through the common monocyte progenitors, immunoregulatory monocytes differentiate from early neutrophil progenitors. These findings may be applied to the development of immunoregulatory monocyte-targeted therapy for human inflammatory diseases.
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ISSN:2211-1247
2211-1247
DOI:10.1016/j.celrep.2023.112165