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• W3206367025 abstract "Abstract Systemic and intracellular metabolic states are critical factors affecting immune cell functions. The metabolic regulator AMP‐activated protein kinase (AMPK) senses AMP levels and mediates cellular responses to energy‐restrained conditions. The ubiquitously expressed AMPK participates in various biological functions in numerous cell types, including innate immune cell macrophages and osteoclasts, which are their specialized derivatives in bone tissues. Previous studies have demonstrated that the activation of AMPK promotes macrophage polarization toward anti‐inflammatory M2 status. Additionally, AMPK acts as a negative regulator of osteoclastogenesis, and upregulation of AMPK disrupts the differentiation of osteoclasts. However, the regulation and roles of AMPK in differentiated osteoclasts have not been characterized. Here, we report that inflammatory stimuli‐regulated‐AMPK activation of differentiated and undifferentiated osteoclasts in opposite ways. Lipopolysaccharide (LPS) inhibited the phosphorylation of AMPK in macrophages and undifferentiated osteoclasts, but it activated AMPK in differentiated osteoclasts. Inactivating AMPK decreased cellular responses against the activation of toll‐like receptor signaling, including the transcriptional activation of proinflammatory cytokines and the bone resorption genes TRAP , and MMP9 . The elevation of bone resorption by LPS stimulation was disrupted by AMPK inhibitor, indicating the pivotal roles of AMPK in inflammation‐induced activities in differentiated osteoclasts. The AMPK activator metformin did not increase proinflammatory responses, possibly because other factors are also required for this regulation. Notably, changing the activation status of AMPK did not alter the expression levels of bone resorption genes in unstimulated osteoclasts, indicating the essential roles of AMPK in cellular responses to inflammatory stimuli but not in the maintenance of basal levels. Unlike its M2‐polarizing roles in macrophages, AMPK was not responsive to the M2 stimulus of interleukin‐4. Our observations revealed differences in the cellular properties of macrophages and osteoclasts as well as the complexity of regulatory mechanisms for osteoclast functions." @default.
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• W3206367025 date "2021-10-19" @default.
• W3206367025 modified "2023-10-17" @default.
• W3206367025 title "AMP‐activated protein kinase mediates lipopolysaccharide‐induced proinflammatory responses and elevated bone resorption in differentiated osteoclasts" @default.
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• W3206367025 doi "https://doi.org/10.1002/jcb.30165" @default.
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