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• W4385199020 abstract "Abstract Mayaro virus (MAYV) is an emerging arbovirus member of the Togaviridae family and Alphavirus genus. MAYV infection causes an acute febrile illness accompanied by persistent polyarthralgia and myalgia. Understanding the mechanisms involved in arthritis caused by alphaviruses is necessary to develop specific therapies. In this work, we investigated the role of the CCL2/CCR2 axis in the pathogenesis of MAYV-induced disease. For this, WT C57BL/6J and CCR2 -/- mice were infected with MAYV subcutaneously and evaluated for disease development. MAYV infection induced an acute inflammatory disease in WT mice. The immune response profile was characterized by an increase in the production of inflammatory mediators, such as IL-6, TNF and CCL2. Higher levels of CCL2 at the local and systemic levels, was followed by significant recruitment of CCR2 + macrophages and a cellular response orchestrated by these cells. CCR2 -/- mice showed an increase in CXCL-1 levels, followed by a replacement of the macrophage inflammatory infiltrate by neutrophils. Additionally, absence of the CCR2 receptor protected mice from bone loss induced by MAYV. Accordingly, the silencing of CCL2 chemokine expression in vivo and the pharmacological blockade of CCR2 promoted a partial improvement in disease. Cell culture data support the mechanism underlying MAYV’s bone pathology in which: i) MAYV infection promoted a pro-osteoclastogenic microenvironment mediated by IL-6, TNF and CCL2 and ii) migration of osteoclast precursors was dependent on the CCR2/CCL2 axis. Overall, these data contribute to the understanding of the pathophysiology of MAYV infection and to the identification future of specific therapeutic targets in MAYV-induced disease. Importance This work demonstrates the role of the CCL2/CCR2 axis in MAYV-induced disease. Infection of WT C57BL/6J and CCR2 -/- mice was associated with high levels of CCL2, an important chemoattractant involved in the recruitment of macrophages, the main precursor of osteoclasts. In the absence of the CCR2 receptor there is a mitigation of macrophage migration to the target organs of infection and protection of these mice against bone loss induced by MAYV infection. Much evidence has shown that host immune response factors contribute significantly to the tissue damage associated to alfavirus infections. Thus, this work highlights molecular and cellular targets involved in the pathogenesis of arthritis triggered by MAYV, and identifies novel therapeutic possibilities directed to the host inflammatory response unleashed by MAYV." @default.
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• W4385199020 date "2023-07-24" @default.
• W4385199020 modified "2023-10-14" @default.
• W4385199020 title "Essential role of the CCL2-CCR2 axis in Mayaro virus-induced disease" @default.
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• W4385199020 doi "https://doi.org/10.1101/2023.07.21.550077" @default.
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