Regulation of Inflammatory Monocyte/macrophage Recruitment from the Bone Marrow During Murine Cytomegalovirus Infection: Role for Type I Interferons in Localized Induction of CCR2 Ligands
Overview
Affiliations
Monocytes/macrophages are critical early innate immune responders during murine CMV (MCMV) infection. It has been established that inflammatory monocyte/macrophages are released from the bone marrow and into the peripheral blood before entry into infected tissue sites. We previously reported a role for IFN-alpha/beta in promotion of CCR2-mediated recruitment of monocyte/macrophages into the liver in response to MCMV infection. However, the mechanisms that support the migration of monocyte/macrophages from the bone marrow and into the peripheral blood under conditions of MCMV infection have not been elucidated. Herein, we demonstrate an accumulation of monocyte/macrophages in the bone marrow of MCMV-infected CCR2-deficient mice, whereas circulating monocyte/macrophages are profoundly diminished. The CCR2 ligands MCP-1, MCP-3, and MCP-5 are detected in bone marrow and in serum from MCMV-infected mice. Furthermore, bone marrow leukocytes from naive mice produce high levels of MCP-1 and MCP-5, and moderate levels of MCP-3, when stimulated with recombinant IFN-alpha in culture. We identify bone marrow F4/80(+) cells as major producers of MCP-1, MCP-3, and MCP-5. Moreover, induction of CCR2 ligands is dependent on IFN-alpha/beta-mediated signals and MCMV infection. Taken together, the results reveal a critical role for inflammatory cytokines in stimulating production of CCR2-binding chemokines from F4/80(+) cells in the bone marrow, and they suggest that local production of chemokines supports monocyte/macrophage egress from the bone marrow into the blood during a virus infection.
Modulation of Monocyte Effector Functions and Gene Expression by Human Cytomegalovirus Infection.
Planchon M, Fishman J, El Khoury J Viruses. 2025; 16(12.
PMID: 39772120 PMC: 11680302. DOI: 10.3390/v16121809.
Wang X, Geng Z, Bao Y, Zhong J, Ma J, Cui X Heliyon. 2024; 10(12):e33237.
PMID: 39021925 PMC: 11252743. DOI: 10.1016/j.heliyon.2024.e33237.
Comprehensive Analysis of Soluble Mediator Profiles in Congenital CMV Infection Using an MCMV Model.
Karner D, Kvestak D, Lisnic B, Cokaric Brdovcak M, Juranic Lisnic V, Kucan Brlic P Viruses. 2024; 16(2).
PMID: 38399983 PMC: 10891658. DOI: 10.3390/v16020208.
Kandalla P, Subburayalu J, Cocita C, de Laval B, Tomasello E, Iacono J EMBO Mol Med. 2023; 15(11):e17694.
PMID: 37635627 PMC: 10630876. DOI: 10.15252/emmm.202317694.
Chen J, Chua D, Lim C, Ho W, Tan N Int J Mol Sci. 2023; 24(1).
PMID: 36613602 PMC: 9820446. DOI: 10.3390/ijms24010158.