Macrophage Adipose Triglyceride Lipase Deficiency Attenuates Atherosclerotic Lesion Development in Low-Density Lipoprotein Receptor Knockout Mice

作者：Lammers Bart^*; Chandak Prakash G; Aflaki Elma; Van Puijvelde Gijs H M; Radovic Branislav; Hildebrand Reeni B; Meurs Illiana; Out Ruud; Kuiper Johan; Van Berkel Theo J C; Kolb Dagmar; Haemmerle Guenter; Zechner Rudolf; Levak Frank Sanja; Van Eck Miranda; Kratky Dagmar

来源：Arteriosclerosis, Thrombosis, and Vascular Biology, 2011, 31(1): 67-+.

DOI：10.1161/ATVBAHA.110.215814

• apoptosis
• atherosclerosis
• leukocytes
• lipids
• macrophages

Objective-The consequences of macrophage triglyceride (TG) accumulation on atherosclerosis have not been studied in detail so far. Adipose triglyceride lipase (ATGL) is the rate-limiting enzyme for the initial step in TG hydrolysis. Because ATGL knockout (KO) mice exhibit massive TG accumulation in macrophages, we used ATGL KO mice to study the effects of macrophage TG accumulation on atherogenesis.
Methods and Results-Low-density lipoprotein receptor (LDLr) KO mice were transplanted with bone marrow from ATGL KO (ATGL KO -> LDLr KO) or wild-type (WT -> LDLr KO) mice and challenged with a Western-type diet for 9 weeks. Despite TG accumulation in ATGL KO macrophages, atherosclerosis in ATGL KO -> LDLr KO mice was 43% reduced associated with decreased plasma monocyte chemoattractant protein-1 (MCP-1) and macrophage interleukin-6 concentrations. This coincided with a reduced amount of macrophages, possibly because of a 39% increase in intraplaque apoptosis and a decreased migratory capacity of ATGL KO macrophages. The reduced number of white blood cells might be due to a 36% decreased Lin(-)Sca-1(+)cKit(+) hematopoietic stem cell population.
Conclusion-We conclude that the attenuation of atherogenesis in ATGL KO -> LDLr KO mice is due to decreased infiltration of less inflammatory macrophages into the arterial wall and increased macrophage apoptosis. (Arterioscler Thromb Vasc Biol. 2011;31:67-73.)

• 出版日期2011-1