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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 FEBS+J
2014 ; 281
(20
): 4557-67
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Signal transducer and activator of transcription 3 and the phosphatidylinositol
3-kinase regulatory subunits p55? and p50? regulate autophagy in vivo
#MMPMID25205393
Pensa S
; Lloyd-Lewis B
; Sargeant TJ
; Resemann HK
; Kahn CR
; Watson CJ
FEBS J
2014[Oct]; 281
(20
): 4557-67
PMID25205393
show ga
Mammary gland involution involves a process that includes one of the most
dramatic examples of cell death in an adult mammalian organism. We have
previously shown that signal transducer and activator of transcription 3 (Stat3)
regulates a lysosomal pathway of cell death in the first 48 h of involution and
induces lysosome leakiness in mammary epithelial cells. Interestingly, Stat3 is
associated also with the striking induction of autophagy that occurs
concomitantly with cell death, presumably as a transient survival mechanism. The
phosphatidylinositol 3-kinase regulatory subunits p55? and p50? are dramatically
and specifically upregulated at the transcriptional level by Stat3 at the onset
of involution. We show here that ablation of either Stat3 or p55?/p50? in vivo
affects autophagy during involution. We used two different cell culture models
(normal mammary epithelial cells and mouse embryonic fibroblasts) to further
investigate the role of p55?/p50? in autophagy regulation. Our results
demonstrate a direct role for p55?/p50? as inhibitors of autophagy mediated by
p85?. Thus, Stat3 and its downstream targets p55?/p50? are key regulators of the
balance between autophagy and cell death in vivo.
|*Autophagy
[MESH]
|Animals
[MESH]
|Blotting, Western
[MESH]
|Cells, Cultured
[MESH]
|Class Ia Phosphatidylinositol 3-Kinase/*physiology
[MESH]