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Table 1 Enzymes and mediators involved in helium mediated cardioprotection

From: Gaseous mediators: an updated review on the effects of helium beyond blowing up balloons

RISK pathway

 Phosphatidylinositol-3-kinase (PI3K)

 Mitogen/extracellular signal-related kinase 1 (MEK-1)

 70-kDa ribosomal protein s6 kinase (p70s6kinase)

 Inhibited glycogen synthase kinase-3beta (GSK-3β) activity

 Activated apoptotic protein p53 degradation

 Protein kinase A (PKA)

Opioid receptors

Endothelial nitric oxide synthase (NOS)

Increased microparticle production in endothelial cells

Reactive oxygen species (ROS)

Maintaining intracellular acidosis during early reperfusion

Cyclooxygenase 2 (COX2)

Changes in ceramide

Mitochondria

 Mitochondrial permeability transition pore (mPTP)

 Mitochondrial adenosine triphosphate-regulated potassium channel (mitoKATP)

 Uncoupling of mitochondrial respiration

 Mitochondrial calcium-sensitive potassium (mKCa) channel

Caveolins

 Increased levels of circulating caveolin-3 in plasma

 Decreased levels of caveolin-1 and caveolin-3 in membrane fractions of myocardial cells

 Increased levels of caveolin-1 and caveolin-3 in ischaemic myocardium