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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
2018 ; 293
(18
): 6958-6968
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Patatin-like phospholipase domain?containing protein 3 promotes transfer of
essential fatty acids from triglycerides to phospholipids in hepatic lipid
droplets
#MMPMID29555681
Mitsche MA
; Hobbs HH
; Cohen JC
J Biol Chem
2018[May]; 293
(18
): 6958-6968
PMID29555681
show ga
Fatty liver disease (FLD) is a burgeoning health problem. A missense variant
(I148M) in patatin-like phospholipase domain-containing protein 3 (PNPLA3)
confers susceptibility to FLD, although the mechanism is not known. To glean
first insights into the physiological function of PNPLA3, we performed detailed
lipidomic profiling of liver lysates and lipid droplets (LDs) from WT and
Pnpla3(-/-) (KO) mice and from knock-in (ki) mice expressing either the 148M
variant (IM-ki mice) or a variant (S47A) that renders the protein catalytically
inactive (SA-ki mice). The four strains differed in composition of
very-long-chain polyunsaturated fatty acids (vLCPUFA) in hepatic LDs. In the LDs
of IM-ki mice, vLCPUFAs were depleted from triglycerides and enriched in
phospholipids. Conversely, vLCPUFAs were enriched in triglycerides and depleted
from phospholipids in SA-ki and Pnpla3(-/-) mice. Release of vLCPUFAs from
hepatic LDs incubated ex vivo was increased in droplets from IM-ki mice and
decreased from droplets isolated from Pnpla3(-/-) and SA-ki mice relative to
those of WT mice. Thus, the physiological role of PNPLA3 appears to be to remodel
triglycerides and phospholipids in LDs, perhaps to accommodate changes in LD size
in response to feeding. Because SA-ki and IM-ki both cause FLD and yet have
opposite effects on the lipidomic profile of LDs, we conclude that the FLD
associated with genetic variation in PNPLA3 is not related to the enzyme's role
in remodeling LD lipids.