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Microbial sensing by haematopoietic stem and progenitor cells: Vigilance against infections and immune education of myeloid cells
Author(s) -
Sioud Mouldy
Publication year - 2020
Publication title -
scandinavian journal of immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.934
H-Index - 88
eISSN - 1365-3083
pISSN - 0300-9475
DOI - 10.1111/sji.12957
Subject(s) - haematopoiesis , innate immune system , stem cell , progenitor cell , biology , immunology , myeloid , immune system , bone marrow , autocrine signalling , paracrine signalling , microbiology and biotechnology , cytokine , toll like receptor , receptor , biochemistry
Bone marrow haematopoietic stem and progenitor cells (HSPCs) express pattern recognition receptors such as Toll‐like receptors (TLRs) to sense microbial products and activation of these innate immune receptors induces cytokine expression and redirects bone marrow haematopoiesis towards the increased production of myeloid cells. Secreted cytokines by HSPCs in response to TLR ligands can act in an autocrine or paracrine manner to regulate haematopoiesis. Moreover, tonic activation of HSPCs by microbiota‐derived compounds might educate HSPCs to produce superior myeloid cells equipped with innate memory responses to combat pathogens. While haematopoietic stem cell activation through TLRs meets the increased demand for blood leucocytes to protect the host against infection, persistent exposure to inflammatory cytokines or microbial products might impair their function and even induce malignant transformation. This review highlights the potential outcomes of HSPCs in response to TLR ligands.