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Background  Loss of ovarian function is highly associated with an elevated risk of metabolic disease. Monocyte chemoattractant protein-1 (MCP-1, C-C chemokine ligand 2) plays critical roles in the development of inflammation, but its role in ovariectomy (OVX)-induced metabolic disturbance has not been known.    Methodology and Principal Findings  We investigated the role of MCP-1 in OVX-induced metabolic perturbation using MCP-1-knockout mice. OVX increased fat mass, serum levels of MCP-1, macrophage-colony stimulating factor (M-CSF), and reactive oxygen species (ROS), whereas MCP-1 deficiency attenuated these. OVX-induced increases of visceral fat resulted in elevated levels of highly inflammatory CD11c-expressing cells as well as other immune cells in adipose tissue, whereas a lack of MCP-1 significantly reduced all of these levels. MCP-1 deficiency attenuated activation of phospholipase Cγ2, transforming oncogene from Ak strain, and extracellular signal-regulated kinase as well as generation of ROS, which is required for up-regulating CD11c expression upon M-CSF stimulation in bone marrow-derived macrophages.    Conclusions/Significance  Our data suggested that MCP-1 plays a key role in developing metabolic perturbation caused by a loss of ovarian functions through elevating CD11c expression via ROS generation.

Monocyte Chemoattractant Protein-1 Deficiency Attenuates Oxidative Stress and Protects against Ovariectomy-Induced Chronic Inflammation in Mice