Selective mitochondrial KATP channel opening controls human myocardial preconditioning: Too much of a good thing?

Surgery ◽  
2000 ◽  
Vol 128 (2) ◽  
pp. 368-373 ◽  
Author(s):  
Benjamin J. Pomerantz ◽  
Thomas N. Robinson ◽  
Julie K. Heimbach ◽  
Casey M. Calkins ◽  
Stephanie A. Miller ◽  
...  
Keyword(s):  
Katp Channel ◽  
Good Thing ◽  
Mitochondrial Katp Channel ◽  
Myocardial Preconditioning ◽  
Channel Opening

The timing and duration of mitochondrial KATP channel opening determines human myocardial preconditioning

2000 ◽  
Vol 191 (4) ◽  
pp. S35
Author(s):  
Benjamin J Pomerantz ◽  
Anirban Banerjee ◽  
Casey M Calkins ◽  
Julie K Heimbach ◽  
Xianzhong Meng ◽  
...  
Keyword(s):  
Katp Channel ◽  
Mitochondrial Katp Channel ◽  
Myocardial Preconditioning ◽  
Channel Opening

scholarly journals The Opening of ATP-Sensitive K+ Channels Protects H9c2 Cardiac Cells Against the High Glucose-Induced Injury and Inflammation by Inhibiting the ROS-TLR4-Necroptosis Pathway

2017 ◽  
Vol 41 (3) ◽  
pp. 1020-1034 ◽  
Author(s):  
Weijie Liang ◽  
Meiji Chen ◽  
Dongdan Zheng ◽  
Jianhao Li ◽  
Mingcai Song ◽  
...  
Keyword(s):  
Cell Viability ◽  
Inflammatory Cytokines ◽  
High Glucose ◽  
Katp Channel ◽  
Channel Blocker ◽  
Cardiac Injury ◽  
Cardiac Cells ◽  
Mitochondrial Katp Channel ◽  
Channel Opening ◽  
Pre Treatment

Background/Aims: Hyperglycemia activates multiple signaling molecules, including reactive oxygen species (ROS), toll-like receptor 4 (TLR4), receptor-interacting protein 3 (RIP3, a kinase promoting necroptosis), which mediate hyperglycemia-induced cardiac injury. This study explored whether inhibition of ROS-TLR4-necroptosis pathway contributed to the protection of ATP-sensitive K+ (KATP) channel opening against high glucose-induced cardiac injury and inflammation. Methods: H9c2 cardiac cells were treated with 35 mM glucose (HG) to establish a model of HG-induced insults. The expression of RIP3 and TLR4 were tested by western blot. Generation of ROS, cell viability, mitochondrial membrane potential (MMP) and secretion of inflammatory cytokines were measured as injury indexes. Results: HG increased the expression of TLR4 and RIP3. Necrostatin-1 (Nec-1, an inhibitor of necroptosis) or TAK-242 (an inhibitor of TLR4) co-treatment attenuated HG-induced up-regulation of RIP3. Diazoxide (DZ, a mitochondrial KATP channel opener) or pinacidil (Pin, a non-selective KATP channel opener) or N-acetyl-L-cysteine (NAC, a ROS scavenger) pre-treatment blocked the up-regulation of TLR4 and RIP3. Furthermore, pre-treatment with DZ or Pin or NAC, or co-treatment with TAK-242 or Nec-1 attenuated HG-induced a decrease in cell viability, and increases in ROS generation, MMP loss and inflammatory cytokines secretion. However, 5-hydroxy decanoic acid (5-HD, a mitochondrial KATP channel blocker) or glibenclamide (Gli, a non-selective KATP channel blocker) pre-treatment did not aggravate HG-induced injury and inflammation. Conclusion: KATP channel opening protects H9c2 cells against HG-induced injury and inflammation by inhibiting ROS-TLR4-necroptosis pathway.

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