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

Caspase-2 mediates triglyceride (TG)-induced macrophage cell death.
BMB Rep. 2017 Aug 03;:
Authors: Lim J, Kim SH, Kim HK, Rhee KJ, Kim YS
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 death is triggered by caspase-1, and thus investigated the relationship between casapse-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.
PMID: 28768565 [PubMed - as supplied by publisher]

Source: BMB Reports - August 3, 2017 Category: Biochemistry Authors: Lim J, Kim SH, Kim HK, Rhee KJ, Kim YS Tags: BMB Rep Source Type: research