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Inadequate remnant volume and regenerative ability of the liver pose life-threatening risks to patients after partial liver transplantation (PLT) or partial hepatectomy (PHx), while few clinical treatments focus on safely accelerating regeneration. Recently, we discovered that supplementing 5-aminolevulinate (5-ALA) improves liver cold adaptation and functional recovery, leading us to uncover a correlation between 5-ALA metabolic activities and post-PLT recovery. In a mouse 2/3 PHx model, 5-ALA supplements enhanced liver regeneration, promoting infiltration and polarization of anti-inflammatory macrophages via P53 signaling. Intriguingly, chemokine receptor CX3CR1 functions to counterbalance these effects. Genetic ablation or pharmacological inhibition of CX3CR1 (AZD8797; phase II trial candidate) augmented the macrophagic production of insulin-like growth factor 1 (IGF-1) and subsequent hepatocyte growth factor (HGF) production by hepatic stellate cells. Thus, short-term treatments with both 5-ALA and AZD8797 demonstrated pro-regeneration outcomes superior to 5-ALA-only treatments in mice after PHx. Overall, our findings may inspire safe and effective strategies to better treat PLT and PHx patients.
Necrotic death of macrophages has long been known to be present in atherosclerotic lesions but has not been studied. We examined the role of receptor interacting protein (RIP) 3, a mediator of necrotic cell death, in atherosclerosis and found that RIP3(-/-);Ldlr(-/-) mice were no different from RIP3(+/+);Ldlr(-/-) mice in early atherosclerosis but had significant reduction in advanced atherosclerotic lesions. Similar results were observed in Apoe(-/-) background mice. Bone marrow transplantation revealed that loss of RIP3 expression from bone-marrow-derived cells is responsible for the reduced disease progression. While no difference was found in apoptosis between RIP3(-/-);Ldlr(-/-) and RIP3(+/+);Ldlr(-/-) mice, electron microscopy revealed a significant reduction of macrophage primary necrosis in the advanced lesions of RIP3(-/-) mice. In vitro cellular studies showed that RIP3 deletion had no effect on oxidized low-density lipoprotein (LDL)-induced macrophage apoptosis, but prevented macrophage primary necrosis occurring in response to oxidized LDL under caspase inhibition or RIP3 overexpression conditions. RIP3-dependent necrosis is not postapoptotic, and the increased primary necrosis in advanced atherosclerotic lesions most likely resulted from the increase of RIP3 expression. Our data demonstrate that primary necrosis of macrophages is proatherogenic during advanced atherosclerosis development.
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