- Lysosome-mediated degradation of a distinct pool of lipid droplets during hepatic stellate cell activation.
Lysosome-mediated degradation of a distinct pool of lipid droplets during hepatic stellate cell activation.
The Journal of biological chemistry (2017-06-16)
Maidina Tuohetahuntila, Martijn R Molenaar, Bart Spee, Jos F Brouwers, Richard Wubbolts, Martin Houweling, Cong Yan, Hong Du, Brian C VanderVen, Arie B Vaandrager, J Bernd Helms
PMID28615446
ABSTRACT
Activation of hepatic stellate cells (HSCs) is a critical step in the development of liver fibrosis. During activation, HSCs lose their lipid droplets (LDs) containing triacylglycerols (TAGs), cholesteryl esters, and retinyl esters (REs). We previously provided evidence for the presence of two distinct LD pools, a preexisting and a dynamic LD pool. Here we investigate the mechanisms of neutral lipid metabolism in the preexisting LD pool. To investigate the involvement of lysosomal degradation of neutral lipids, we studied the effect of lalistat, a specific lysosomal acid lipase (LAL/Lipa) inhibitor on LD degradation in HSCs during activation