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Age impairs soluble guanylyl cyclase function in mouse mesenteric arteries

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Item Type:Article
Title:Age impairs soluble guanylyl cyclase function in mouse mesenteric arteries
Creators Name:Zhong, C., Xu, M., Boral, S., Summer, H., Lichtenberger, F.B., Erdoğan, C., Gollasch, M., Golz, S., Persson, P.B., Schleifenbaum, J., Patzak, A. and Khedkar, P.H.
Abstract:Endothelial dysfunction (ED) comes with age, even without overt vessel damage such as that which occurs in atherosclerosis and diabetic vasculopathy. We hypothesized that aging would affect the downstream signalling of the endothelial nitric oxide (NO) system in the vascular smooth muscle (VSM). With this in mind, resistance mesenteric arteries were isolated from 13-week (juvenile) and 40-week-old (aged) mice and tested under isometric conditions using wire myography. Acetylcholine (ACh)-induced relaxation was reduced in aged as compared to juvenile vessels. Pretreatment with L-NAME, which inhibits nitrix oxide synthases (NOS), decreased ACh-mediated vasorelaxation, whereby differences in vasorelaxation between groups disappeared. Endothelium-independent vasorelaxation by the NO donor sodium nitroprusside (SNP) was similar in both groups; however, SNP bolus application (10(-6) mol L(-1)) as well as soluble guanylyl cyclase (sGC) activation by runcaciguat (10(-6) mol L(-1)) caused faster responses in juvenile vessels. This was accompanied by higher cGMP concentrations and a stronger response to the PDE5 inhibitor sildenafil in juvenile vessels. Mesenteric arteries and aortas did not reveal apparent histological differences between groups (van Gieson staining). The mRNA expression of the α1 and α2 subunits of sGC was lower in aged animals, as was PDE5 mRNA expression. In conclusion, vasorelaxation is compromised at an early age in mice even in the absence of histopathological alterations. Vascular smooth muscle sGC is a key element in aged vessel dysfunction.
Keywords:Aging, Mesenteric Artery, Nitric Oxide, Soluble Guanylyl Cyclase, Soluble Guanylyl Cyclase Activator, Animals, Mice
Source:International Journal of Molecular Sciences
ISSN:1422-0067
Publisher:MDPI
Volume:22
Number:21
Page Range:11412
Date:22 October 2021
Official Publication:https://doi.org/10.3390/ijms222111412
PubMed:View item in PubMed

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