Mitogen-activated protein kinases modulate H2O2-induced apoptosis in primary rat alveolar epithelial cells

2004 ◽  
Vol 92 (3) ◽  
pp. 502-513 ◽  
Author(s):  
Helotonio Carvalho ◽  
Pablo Evelson ◽  
Samuel Sigaud ◽  
Beatriz González-Flecha
Keyword(s):  
Epithelial Cells ◽  
Protein Kinases ◽  
Alveolar Epithelial Cells ◽  
Mitogen Activated Protein Kinases ◽  
Alveolar Epithelial ◽  
Mitogen Activated Protein ◽  
Induced Apoptosis

JNK and ERK mitogen-activated protein kinases mediate THDA-induced apoptosis in K562 cells

2007 ◽  
Vol 24 (4) ◽  
pp. 291-302 ◽  
Author(s):  
Sheng-Huei Yang ◽  
Zchong-Zcho Wu ◽  
Ching-Ming Chien ◽  
Yu-Hsiang Lo ◽  
Ming-Jung Wu ◽  
...  
Keyword(s):  
Protein Kinases ◽  
K562 Cells ◽  
Mitogen Activated Protein Kinases ◽  
Mitogen Activated Protein ◽  
Induced Apoptosis

scholarly journals Abrogation of ER stress-induced apoptosis of alveolar epithelial cells by angiotensin 1–7

2013 ◽  
Vol 305 (1) ◽  
pp. L33-L41 ◽  
Author(s):  
Bruce D. Uhal ◽  
Hang Nguyen ◽  
MyTrang Dang ◽  
Indiwari Gopallawa ◽  
Jing Jiang ◽  
...  
Keyword(s):  
Epithelial Cells ◽  
Er Stress ◽  
Cathepsin D ◽  
Primary Cultures ◽  
A549 Cells ◽  
Surfactant Protein ◽  
Alveolar Epithelial Cells ◽  
Alveolar Epithelial ◽  
Induced Apoptosis ◽  
Jnk Activation

Earlier work showed that apoptosis of alveolar epithelial cells (AECs) in response to endogenous or xenobiotic factors is regulated by autocrine generation of angiotensin (ANG) II and its counterregulatory peptide ANG1–7. Mutations in surfactant protein C (SP-C) induce endoplasmic reticulum (ER) stress and apoptosis in AECs and cause lung fibrosis. This study tested the hypothesis that ER stress-induced apoptosis of AECs might also be regulated by the autocrine ANGII/ANG1–7 system of AECs. ER stress was induced in A549 cells or primary cultures of human AECs with the proteasome inhibitor MG132 or the SP-C BRICHOS domain mutant G100S. ER stress activated the ANGII-generating enzyme cathepsin D and simultaneously decreased the ANGII-degrading enzyme ACE-2, which normally generates the antiapoptotic peptide ANG1–7. TAPI-2, an inhibitor of ADAM17/TACE, significantly reduced both the activation of cathepsin D and the loss of ACE-2. Apoptosis of AECs induced by ER stress was measured by assays of mitochondrial function, JNK activation, caspase activation, and nuclear fragmentation. Apoptosis induced by either MG132 or the SP-C BRICHOS mutant G100S was significantly inhibited by the ANG receptor blocker saralasin and was completely abrogated by ANG1–7. Inhibition by ANG1–7 was blocked by the specific mas antagonist A779. These data show that ER stress-induced apoptosis is mediated by the autocrine ANGII/ANG1–7 system in human AECs and demonstrate effective blockade of SP-C mutation-induced apoptosis by ANG1–7. They also suggest that therapeutic strategies aimed at administering ANG1–7 or stimulating ACE-2 may hold potential for the management of ER stress-induced fibrotic lung disorders.

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