Inhibition of Src and forkhead box O1 signaling by induced pluripotent stem-cell therapy attenuates hyperoxia-augmented ventilator-induced diaphragm dysfunction

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• 作者：Li-Fu Li^a ; ^b ; Yuh-Lih Chang^c ; ^d ; Ning-Hung Chen^a ; ^b ; Chien-Ying Wang^c ; ^d ; Gwo-Jyh Chang^e ; Meng-Chih Lin^f ; Chih-Hao Chang^a ; Chung-Chi Huang^a ; ^b ; Jen-Hua Chuang^c ; ^d ; Yi-Pin Yang^c ; ^g ; Shih-Hwa Chiou^c ; ^d ; ^g ; Yung-Yang Liu^g ; ^h ; ^{yyliu1103@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：ALI ; acute lung injury ; FoxO1 ; class O of forkhead box 1 ; iPSCs ; induced pluripotent stem cells ; iPSC-CM ; induced pluripotent stem-cell&ndash ; derived conditioned medium ; LC3 ; light chain 3 ; MDA ; malondialdehyde ; MuRF-1 ; muscle ring finger-1 ; MV ; mechanical ventilation ; Parp1 ; Poly (ADP-ribose) polymerase 1 ; ROS ; reactive oxygen species ; UPP ; ubiquitin-proteasome pathway ; VIDD ; ventilator-induced diaphragm dysfunction ; VILI ; ventilator-induced lung injury
• 刊名：Translational Research
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：173
• 期：Complete
• 页码：131-147.e1
• 全文大小：3010 K

文摘

Mechanical ventilation (MV) with hyperoxia is required for providing life support to patients with acute lung injury (ALI). However, MV may cause diaphragm weakness through muscle injury and atrophy, an effect termed ventilator-induced diaphragm dysfunction (VIDD). Src protein tyrosine kinase and class O of forkhead box 1 (FoxO1) mediate acute inflammatory responses and muscle protein degradation induced by oxidative stress. Induced pluripotent stem cells (iPSCs) have been reported to improve hyperoxia-augmented ALI; however, the mechanisms regulating the interactions among VIDD, hyperoxia, and iPSCs are unclear. In this study, we hypothesized that iPSC therapy can ameliorate hyperoxia-augmented VIDD by suppressing the Src-FoxO1 pathway. Male C57BL/6 mice, either wild-type or Src-deficient, aged between 6 and 8 weeks were exposed to MV (6 or 10 mL/kg) with or without hyperoxia for 2–8 h after the administration of 5 × 10⁷ cells/kg Oct4/Sox2/Parp1 mouse iPSCs or iPSC-derived conditioned medium (iPSC-CM). Nonventilated mice were used as controls. MV during hyperoxia aggravated VIDD, as demonstrated by the increases in Src activation, FoxO1 dephosphorylation, malondialdehyde, caspase-3, atrogin-1 and muscle ring finger-1 production, microtubule-associated protein light chain 3-II, disorganized myofibrils, disrupted mitochondria, autophagy, and myonuclear apoptosis; however, MV with hyperoxia reduced mitochondrial cytochrome C, diaphragm muscle fiber size, and contractility (P < 0.05). Hyperoxia-exacerbated VIDD was attenuated in Src-deficient mice and by iPSCs and iPSC-CM (P < 0.05). Our data indicate that iPSC therapy attenuates MV-induced diaphragmatic injury that occurs during hyperoxia-augmented VIDD by inhibiting the Src-FoxO1 signaling pathway.