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http://dx.doi.org/10.5483/BMBRep.2017.50.10.106

Caspase-2 mediates triglyceride (TG)-induced macrophage cell death  

Lim, Jaewon (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University)
Kim, Hyun-Kyung (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University)
Kim, Sung Hoon (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University)
Rhee, Ki-Jong (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University)
Kim, Yoon Suk (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University)
Publication Information
BMB Reports / v.50, no.10, 2017 , pp. 510-515 More about this Journal
Abstract
Triglyceride (TG) accumulation causes macrophage cell death, which affects the development of atherosclerosis. Here, we examined whether caspase-2 is implicated in TG-induced macrophage cell death. We found that caspase-2 activity is increased in TG-treated THP-1 macrophages, and that inhibition of caspase-2 activity drastically inhibits TG-induced cell death. We previously reported that TG-induced macrophage cell death is triggered by caspase-1, and thus investigated the relationship between caspase-2 and caspase-1 in TG-induced macrophage cell death. Inhibition of caspase-2 activity decreased caspase-1 activity in TG-treated macrophages. However, caspase-1 inhibition did not affect caspase-2 activity, suggesting that caspase-2 is upstream of caspase-1. Furthermore, we found that TG induces activation of caspase-3, -7, -8, and -9, as well as cleavage of PARP. Inhibition of caspase-2 and -1 decreased TG-induced caspase-3, -7, -8, and -9 activation and PARP cleavage. Taken together, these results suggest that TG-induced macrophage cell death is mediated via the caspase-2/caspase-1/apoptotic caspases/PARP pathways.
Keywords
Apoptotic caspases; Caspase-1; Caspase-2; THP-1 macrophages; Triglyceride (TG);
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