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2018 ; 2018
(ä): 7852742
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The Kat in the HAT: The Histone Acetyl Transferase Kat6b (MYST4) Is Downregulated
in Murine Macrophages in Response to LPS
#MMPMID29977151
Shukla S
; Levine C
; Sripathi RP
; Elson G
; Lutz CS
; Leibovich SJ
Mediators Inflamm
2018[]; 2018
(ä): 7852742
PMID29977151
show ga
Epigenetic modulators, including histone methylases, demethylases, and
deacetylases, have been implicated previously in the regulation of classical and
alternative macrophage activation pathways. In this study, we show that the
histone acetyl transferase (HAT) Kat6B (MYST4) is strongly suppressed (>80%) in
macrophages by lipopolysaccharide (LPS) (M1 activation), while Kat6A, its partner
in the MOZ/MORF complex, is reciprocally upregulated. This pattern of expression
is not altered by LPS together with the adenosine receptor agonist NECA (M2d
activation). This is despite the observation that miR-487b, a putative regulator
of Kat6B expression, is mildly stimulated by LPS, but strongly suppressed by
LPS/NECA. Other members of the MYST family of HATs (Kat5, Kat7, and Kat8) are
unaffected by LPS treatment. Using the pLightswitch 3'UTR reporter plasmid, the
miR-487b binding site in the Kat6b 3'UTR was found to play a role in the
LPS-mediated suppression of Kat6B expression, but other as-yet unidentified
factors are also involved. As Kat6B is a HAT that has the potential to modulate
gene expression by its effects on chromatin accessibility, we are continuing our
studies into the potential roles of this epigenetic modulator in macrophage
activation pathways.