| First Author | Xiao M | Year | 2021 |
| Journal | Blood | Volume | 137 |
| Issue | 25 | Pages | 3533-3547 |
| PubMed ID | 33684929 | Mgi Jnum | J:343861 |
| Mgi Id | MGI:6724760 | Doi | 10.1182/blood.2020007731 |
| Citation | Xiao M, et al. (2021) Osteocytes regulate neutrophil development through IL-19: a potent cytokine for neutropenia treatment. Blood 137(25):3533-3547 |
| abstractText | Osteocytes are the most abundant (90% to 95%) cells in bone and have emerged as an important regulator of hematopoiesis, but their role in neutrophil development and the underlying mechanisms remain unclear. Interleukin 19 (IL-19) produced predominantly by osteocytes stimulated granulopoiesis and neutrophil formation, which stimulated IL-19 receptor (IL-20Rbeta)/Stat3 signaling in neutrophil progenitors to promote their expansion and neutrophil formation. Mice with constitutive activation of mechanistic target of rapamycin complex (mTORC1) signaling in osteocytes (Dmp1-Cre) exhibited a dramatic increase in IL-19 production and promyelocyte/myelocytic expansion, whereas mTORC1 inactivation in osteocytes reduced IL-19 production and neutrophil numbers in mice. We showed that IL-19 administration stimulated neutrophil development, whereas neutralizing endogenous IL-19 or depletion of its receptor inhibited the process. Importantly, low-dose IL-19 reversed chemotherapy, irradiation, or chloramphenicol-induced neutropenia in mice more efficiently than granulocyte colony-stimulating factor. This evidence indicated that IL-19 was an essential regulator of neutrophil development and a potent cytokine for neutropenia treatment. |
