Warning: file_get_contents(https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=29632530
&cmd=llinks): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests
in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 215
Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 265.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 265.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\29632530
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Front+Immunol
2018 ; 9
(ä): 549
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Ezh2 Regulates Activation-Induced CD8(+) T Cell Cycle Progression via Repressing
Cdkn2a and Cdkn1c Expression
#MMPMID29632530
Chen G
; Subedi K
; Chakraborty S
; Sharov A
; Lu J
; Kim J
; Mi X
; Wersto R
; Sung MH
; Weng NP
Front Immunol
2018[]; 9
(ä): 549
PMID29632530
show ga
Transition from resting to cell cycle in response to antigenic stimulation is an
essential step for naïve CD8(+) T cells to differentiate to effector and memory
cells. Leaving the resting state requires dramatic changes of chromatin status in
the key cell cycle inhibitors but the details of these concerted events are not
fully elucidated. Here, we showed that Ezh2, an enzymatic component of polycomb
repressive complex 2 (PRC2) catalyzing the trimethylation of lysine 27 on histone
3 (H3K27me3), regulates activation induced naïve CD8(+) T cells proliferation and
apoptosis. Upon deletion of Ezh2 during thymocyte development
(Ezh2(fl/fl)Cd4Cre(+) mice), naive CD8(+) T cells displayed impaired
proliferation and increased apoptosis in response to antigen stimulation.
However, naive CD8(+) T cells only had impaired proliferation but no increase in
apoptosis when Ezh2 was deleted after activation (Ezh2(fl/fl)GzmBCre(+) mice),
suggesting cell cycle and apoptosis are temporally separable events controlled by
Ezh2. We then showed that deletion of Ezh2 resulted in the increase in expression
of cyclin-dependent kinase inhibitors Cdkn2a (p16 and Arf) and Cdkn1c (p57) in
activated naïve CD8(+) T cells as the consequence of reduced levels of H3K27me3
at these two gene loci. Finally, with real time imaging, we observed prolonged
cell division times of naïve CD8(+) T cells in the absence of Ezh2 post in vitro
stimulation. Together, these findings reveal that repression of Cdkn1c and Cdkn2a
by Ezh2 plays a critical role in execution of activation-induced CD8(+) T cell
proliferation.