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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 Am+J+Transl+Res
2017 ; 9
(2
): 664-673
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English Wikipedia
Hypoxic preconditioning of human cardiosphere-derived cell sheets enhances
cellular functions via activation of the PI3K/Akt/mTOR/HIF-1? pathway
#MMPMID28337294
Tanaka Y
; Hosoyama T
; Mikamo A
; Kurazumi H
; Nishimoto A
; Ueno K
; Shirasawa B
; Hamano K
Am J Transl Res
2017[]; 9
(2
): 664-673
PMID28337294
show ga
Cell sheet technology is a promising therapeutic strategy for the treatment of
ischemic diseases such as myocardial infarction. We recently developed a novel
protocol, termed "hypoxic preconditioning," capable of augmenting the therapeutic
efficacy of cell sheets. Following this protocol, the pro-angiogenic and
anti-fibrotic activity of cell sheets were enhanced by brief incubation of cell
sheets under hypoxic culture conditions. However, the precise molecular mechanism
underlying the hypoxic preconditioning of cell sheets is unclear. In the present
study, we examined signal transducers in cell sheets to identify those responsive
to hypoxic preconditioning, using cardiosphere-derived cell (CDC) sheets. We
initially tested whether sheet-like structures were suitable for hypoxic
preconditioning by comparing them with individual cells. Hypoxic preconditioning
was more effective in sheeted cells than in individual cells. Expression of
hypoxia inducible factor-1? (HIF-1?) and mammalian target of rapamycin (mTOR)
were induced upon hypoxic preconditioning of cell sheets, as was the
phosphoinositide 3-kinase (PI3K)/Akt pathway. In addition, hypoxic
preconditioning increased phosphorylation of epidermal growth factor receptor
(EGFR) and heat shock protein 60 (HSP60) in CDC sheets. Our findings provide
novel insights into the utility of hypoxic preconditioning in cell sheet-based
technologies for the treatment of ischemic diseases.