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2016 ; 7
(41
): 66444-66454
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?-Hydroxybutyrate suppresses inflammasome formation by ameliorating endoplasmic
reticulum stress via AMPK activation
#MMPMID27661104
Bae HR
; Kim DH
; Park MH
; Lee B
; Kim MJ
; Lee EK
; Chung KW
; Kim SM
; Im DS
; Chung HY
Oncotarget
2016[Oct]; 7
(41
): 66444-66454
PMID27661104
show ga
?-Hydroxybutyrate, a ketone body that is used as an energy source in organs such
as the brain, muscle, and heart when blood glucose is low, is produced by fatty
acid oxidation in the liver under the fasting state. Endoplasmic reticulum (ER)
stress is linked with the generation of intracellular reactive oxygen species and
the accumulation of misfolded protein in the ER. ER stress is known to induce the
NOD-like receptor protein 3 inflammasome, which mediates activation of the
proinflammatory cytokine interleukin-1?, whose maturation is caspase-1-dependent.
We investigated whether ?-hydroxybutyrate modulates ER stress, inflammasome
formation, and insulin signaling. Sprague Dawley rats (6 and 24 months of age)
that were starved for 3 d and rats treated with ?-hydroxybutyrate (200
mg·kg-1·d-1 i.p., for 5 d) were used for in vivo investigations, whereas human
hepatoma HepG2 cells were used for in vitro studies. Overexpression of AMPK in
cultured cells was performed to elucidate the molecular mechanism. The starvation
resulted in increased serum ?-hydroxybutyrate levels with decreased ER stress
(PERK, IRE1, and ATF6?) and inflammasome (ASC, caspase-1, and NLRP3) formation
compared with non-fasted 24-month-old rats. In addition, ?-hydroxybutyrate
suppressed the increase of ER stress- and inflammasome-related marker proteins.
Furthermore, ?-hydroxybutyrate treatment increased the expression of manganese
superoxide dismutase and catalase via the AMP-activated protein kinase-forkhead
box protein O3? transcription factor pathway both in vivo and in vitro. The
significance of the current study was the discovery of the potential therapeutic
role of ?-hydroxybutyrate in suppressing ER-stress-induced inflammasome
formation.