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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
2016 ; 291
(20
): 10659-76
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Inactivation of Tm6sf2, a Gene Defective in Fatty Liver Disease, Impairs
Lipidation but Not Secretion of Very Low Density Lipoproteins
#MMPMID27013658
Smagris E
; Gilyard S
; BasuRay S
; Cohen JC
; Hobbs HH
J Biol Chem
2016[May]; 291
(20
): 10659-76
PMID27013658
show ga
A missense mutation (E167K) in TM6SF2 (transmembrane 6 superfamily member 2), a
polytopic protein of unknown function, is associated with the full spectrum of
fatty liver disease. To investigate the role of TM6SF2 in hepatic triglyceride
(TG) metabolism, we inactivated the gene in mice. Chronic inactivation of Tm6sf2
in mice is associated with hepatic steatosis, hypocholesterolemia, and
transaminitis, thus recapitulating the phenotype observed in humans. No dietary
challenge was required to elicit the phenotype. Immunocytochemical and cell
fractionation studies revealed that TM6SF2 was present in the endoplasmic
reticulum and Golgi complex, whereas the excess neutral lipids in the Tm6sf2(-/-)
mice were located in lipid droplets. Plasma VLDL-TG levels were reduced in the KO
animals due to a 3-fold decrease in VLDL-TG secretion rate without any associated
reduction in hepatic apoB secretion. Both VLDL particle size and plasma
cholesterol levels were significantly reduced in KO mice. Despite levels of
TM6SF2 protein being 10-fold higher in the small intestine than in the liver,
dietary lipid absorption was only modestly reduced in the KO mice. Our data,
taken together, reveal that TM6SF2 is required to mobilize neutral lipids for
VLDL assembly but is not required for secretion of apoB-containing lipoproteins.
Despite TM6SF2 being located in the endoplasmic reticulum and Golgi complex, the
lipids that accumulate in its absence reside in lipid droplets.