A significant feature of redox and Ca2þ signalling is the reciprocal
interaction that occurs between these two systems (Fig. 4). For
example, H2O2 can enhance the sensitivity of Ca2þ release by
inositol 1,4,5-trisphosphate receptors (InsP3Rs) [92e96] and ryanodine
receptors (RYRs) [97,98] to increase the release of Ca2þ from
the endoplasmic reticulum (ER). In addition, oxidation can induce
an elevation in cytosolic Ca2þ by inhibiting the PMCA pumps [99].
In contrast, ROS acts to inhibit Ca2þ entry through voltage-operated
Ca2þ channels such as the T-type channels
A significant feature of redox and Ca2þ signalling is the reciprocalinteraction that occurs between these two systems (Fig. 4). Forexample, H2O2 can enhance the sensitivity of Ca2þ release byinositol 1,4,5-trisphosphate receptors (InsP3Rs) [92e96] and ryanodinereceptors (RYRs) [97,98] to increase the release of Ca2þ fromthe endoplasmic reticulum (ER). In addition, oxidation can inducean elevation in cytosolic Ca2þ by inhibiting the PMCA pumps [99].In contrast, ROS acts to inhibit Ca2þ entry through voltage-operatedCa2þ channels such as the T-type channels
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