Medizinische Universität Graz - Research portal
Selected Publication:
SHR Neuro Cancer Cardio Lipid Metab Microb
Aflaki, E; Radovic, B; Chandak, PG; Kolb, D; Eisenberg, T; Ring, J; Fertschai, I; Uellen, A; Wolinski, H; Kohlwein, SD; Zechner, R; Levak-Frank, S; Sattler, W; Graier, WF; Malli, R; Madeo, F; Kratky, D.
Triacylglycerol accumulation activates the mitochondrial apoptosis pathway in macrophages.
J Biol Chem. 2011; 286(9): 7418-7428.
Doi: 10.1074/jbc.M110.175703
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- Leading authors Med Uni Graz
- Aflaki Elma
- Kratky Dagmar
- Co-authors Med Uni Graz
- Chandak Prakash Gopal Das
- Fertschai Ismene
- Graier Wolfgang
- Kolb Dagmar
- Levak Sanja
- Malli Roland
- Radovic Branislav
- Sattler Wolfgang
- Üllen Andreas
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- Abstract:
- Programmed cell death of lipid-laden macrophages is a prominent feature of atherosclerotic lesions and mostly ascribed to accumulation of excess intracellular cholesterol. The present in vitro study investigated whether intracellular triacylglycerol (TG) accumulation could activate a similar apoptotic response in macrophages. To address this question, we utilized peritoneal macrophages isolated from mice lacking adipose triglyceride lipase (ATGL), the major enzyme responsible for TG hydrolysis in multiple tissues. In Atgl(-/-) macrophages, we observed elevated levels of cytosolic Ca(2+) and reactive oxygen species, stimulated cytochrome c release, and nuclear localization of apoptosis-inducing factor. Fragmented mitochondria prior to cell death were indicative of the mitochondrial apoptosis pathway being triggered as a consequence of defective lipolysis. Other typical markers of apoptosis, such as externalization of phosphatidylserine in the plasma membrane, caspase 3 and poly(ADP-ribose) polymerase cleavage, were increased in Atgl(-/-) macrophages. An artificial increase of cellular TG levels by incubating wild-type macrophages with very low density lipoprotein closely mimicked the apoptotic phenotype observed in Atgl(-/-) macrophages. Results obtained during the present study define a novel pathway linking intracellular TG accumulation to mitochondrial dysfunction and programmed cell death in macrophages.
- Find related publications in this database (using NLM MeSH Indexing)
- Animals -
- Apoptosis - physiology
- Apoptosis Inducing Factor - metabolism
- Atherosclerosis - metabolism
- Cells, Cultured -
- Cholesterol, VLDL - metabolism
- Female -
- Lipase - genetics
- Macrophages, Peritoneal - metabolism
- Mice -
- Mice, Inbred C57BL -
- Mice, Mutant Strains -
- Mitochondria - metabolism
- Signal Transduction - physiology
- Triglycerides - metabolism