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2017 ; 2
(3
): ä Nephropedia Template TP
gab.com Text
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English Wikipedia
Smyd1C Mediates CD8 T Cell Death via Regulation of Bcl2-Mediated Restriction of
outer Mitochondrial Membrane Integrity
#MMPMID29177249
Nie H
; Rathbun G
; Tucker H
J Cell Signal (Los Angel)
2017[Sep]; 2
(3
): ä PMID29177249
show ga
The SET and Mynd domain 1 (Smyd1) locus encodes three tissue-restricted isoforms.
Two previously characterized isoforms, Smyd1A and Smyd1B, are heart and skeletal
muscle-restricted histone methyl transferases. Here we report that a third,
non-catalytic isoform, Smyd1C, is expressed predominantly in activated CD8 T
cells. While Smyd1C- deficient CD8 T cells undergo activation-induced apoptosis,
neither of two classical mechanisms activation-induced cell death nor activated
cell autonomous death are utilized. Instead, Smyd1C accumulates within both
mitochondria and the immunological synapse where it associates with Bcl-2,
FK506-Binding Protein 8/38 (FKBP38) and Calcineurin. This complex maintains Bcl-2
phosphorylation, enhanced mitochondrial localization, and restricted apoptosis of
activated CD8 T cells. We suggest that CD8 T cell death is governed, in part, by
Smyd1C regulation of Bcl2-mediated restriction of outer mitochondrial membrane
integrity.