TY - JOUR
T1 - Regulation of the expression of soluble guanylyl cyclase by reactive oxygen species
AU - Gerassimou, C.
AU - Kotanidou, A.
AU - Zhou, Z.
AU - Simoes, D. C. M.
AU - Roussos, C.
AU - Papapetropoulos, A.
PY - 2007/4
Y1 - 2007/4
N2 - Background and purpose: Superoxide anions produced during vascular disease scavenge nitric oxide (NO), thereby reducing its biological activity. The aim of the present study was to investigate whether reactive oxygen species (ROS) have a direct effect on soluble guanylyl cyclase (sGC) subunit levels and function and to ascertain the mechanism(s) involved. Experimental approach: Rat aortic smooth muscle cells (RASM) or freshly isolated vessels were exposed to reactive oxygen species (ROS)-generating agents and sGC subunit expression was determined at the mRNA and/or protein level. cGMP accumulation was also determined in RASM exposed to ROS. Key results: Incubation of smooth muscle cells with H 2O 2, xanthine/xanthine oxidase (X/XO) or menadione sodium bisulphite (MSB) significantly decreased protein levels of α1 and β1 subunits of sGC and reduced SNP-induced cGMP formation. Similarly, sGC expression was reduced in freshly isolated vessels exposed to ROS-generating agents. The ROS-triggered inhibition of α1 and β1 levels was not blocked by proteasome inhibitors, suggesting that decreased sGC protein was not due to protein degradation through this pathway. Real time RT-PCR analysis demonstrated a 68% reduction in steady state mRNA levels for the α1 subunit following exposure to H 2O 2. In addition, α1 promoter-driven luciferase activity in RASM decreased by 60% after H 2O 2 treatment. Conclusion and implications: We conclude that oxidative stress triggers a decrease in sGC expression and activity that results from reduced sGC steady state mRNA levels. Altered sGC expression is expected to contribute to the changes in vascular tone and remodeling observed in diseases associated with ROS overproduction.
AB - Background and purpose: Superoxide anions produced during vascular disease scavenge nitric oxide (NO), thereby reducing its biological activity. The aim of the present study was to investigate whether reactive oxygen species (ROS) have a direct effect on soluble guanylyl cyclase (sGC) subunit levels and function and to ascertain the mechanism(s) involved. Experimental approach: Rat aortic smooth muscle cells (RASM) or freshly isolated vessels were exposed to reactive oxygen species (ROS)-generating agents and sGC subunit expression was determined at the mRNA and/or protein level. cGMP accumulation was also determined in RASM exposed to ROS. Key results: Incubation of smooth muscle cells with H 2O 2, xanthine/xanthine oxidase (X/XO) or menadione sodium bisulphite (MSB) significantly decreased protein levels of α1 and β1 subunits of sGC and reduced SNP-induced cGMP formation. Similarly, sGC expression was reduced in freshly isolated vessels exposed to ROS-generating agents. The ROS-triggered inhibition of α1 and β1 levels was not blocked by proteasome inhibitors, suggesting that decreased sGC protein was not due to protein degradation through this pathway. Real time RT-PCR analysis demonstrated a 68% reduction in steady state mRNA levels for the α1 subunit following exposure to H 2O 2. In addition, α1 promoter-driven luciferase activity in RASM decreased by 60% after H 2O 2 treatment. Conclusion and implications: We conclude that oxidative stress triggers a decrease in sGC expression and activity that results from reduced sGC steady state mRNA levels. Altered sGC expression is expected to contribute to the changes in vascular tone and remodeling observed in diseases associated with ROS overproduction.
KW - cGMP
KW - Nitric oxide
KW - Reactive oxygen species
KW - Soluble guanylyl cyclase
UR - https://doi.org/10.1038/sj.bjp.0707256
U2 - 10.1038/sj.bjp.0707179
DO - 10.1038/sj.bjp.0707179
M3 - Article
C2 - 17339839
AN - SCOPUS:34247249901
VL - 150
SP - 1084
EP - 1091
JO - British Journal of Pharmacology
JF - British Journal of Pharmacology
SN - 0007-1188
IS - 8
ER -