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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2014 ; 289
(28
): 19279-93
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Hypoxia-inducible lipid droplet-associated (HILPDA) is a novel peroxisome
proliferator-activated receptor (PPAR) target involved in hepatic triglyceride
secretion
#MMPMID24876382
Mattijssen F
; Georgiadi A
; Andasarie T
; Szalowska E
; Zota A
; Krones-Herzig A
; Heier C
; Ratman D
; De Bosscher K
; Qi L
; Zechner R
; Herzig S
; Kersten S
J Biol Chem
2014[Jul]; 289
(28
): 19279-93
PMID24876382
show ga
Peroxisome proliferator-activated receptors (PPARs) play major roles in the
regulation of hepatic lipid metabolism through the control of numerous genes
involved in processes such as lipid uptake and fatty acid oxidation. Here we
identify hypoxia-inducible lipid droplet-associated (Hilpda/Hig2) as a novel PPAR
target gene and demonstrate its involvement in hepatic lipid metabolism.
Microarray analysis revealed that Hilpda is one of the most highly induced genes
by the PPAR? agonist Wy14643 in mouse precision cut liver slices. Induction of
Hilpda mRNA by Wy14643 was confirmed in mouse and human hepatocytes. Oral dosing
with Wy14643 similarly induced Hilpda mRNA levels in livers of wild-type mice but
not Ppara(-/-) mice. Transactivation studies and chromatin immunoprecipitation
showed that Hilpda is a direct PPAR? target gene via a conserved PPAR response
element located 1200 base pairs upstream of the transcription start site. Hepatic
overexpression of HILPDA in mice via adeno-associated virus led to a 4-fold
increase in liver triglyceride storage, without any changes in key genes involved
in de novo lipogenesis, ?-oxidation, or lipolysis. Moreover, intracellular lipase
activity was not affected by HILPDA overexpression. Strikingly, HILPDA
overexpression significantly impaired hepatic triglyceride secretion. Taken
together, our data uncover HILPDA as a novel PPAR target that raises hepatic
triglyceride storage via regulation of triglyceride secretion.