TY - JOUR
T1 - Effect of endoplasmic reticulum stress on endothelial ischemia-reperfusion injury in humans
AU - Hemingway, Holden W.
AU - Moore, Amy M.
AU - Olivencia-Yurvati, Albert H.
AU - Romero, Steven A.
N1 - Funding Information:
Funding was provided by the National Institute on Aging Grants R01-AG-059314 and T32-AG-020494 and laboratory startup funds from the University of North Texas Health Science Center.
Publisher Copyright:
Copyright © 2020 the American Physiological Society
PY - 2020/12/4
Y1 - 2020/12/4
N2 - Endoplasmic reticulum stress contributes to ischemia-reperfusion (I/R) injury in rodent and cell models. However, the contribution of endoplasmic reticulum stress in the pathogenesis of endothelial I/R injury in humans is unknown. We tested the hypothesis that compared with placebo, inhibition of endoplasmic reticulum stress via ingestion of tauroursodeoxycholic acid would prevent the attenuation of endothelium-dependent vasodilation following I/R injury. Twelve young adults (6 women) were studied following ingestion of a placebo or 1,500 mg tauroursodeoxycholic acid (TUDCA). Endothelium-dependent vasodilation was assessed via brachial artery flow-mediated dilation (duplex ultrasonography) before and after I/R injury, which was induced by 20 min of arm ischemia followed by 20 min of reperfusion. Endothelium-independent vasodilation (glyceryl trinitrate-mediated vasodilation) was also assessed after I/R injury. Compared with placebo, TUDCA ingestion increased circulating plasma concentrations by 145±90 ng/ml and increased concentrations of the taurine unconjugated form, ursodeoxycholic acid, by 560±156 ng/ml (both P < 0.01). Ischemia-reperfusion injury attenuated endothelium-dependent vasodilation, an effect that did not differ between placebo (pre-I/R, 5.0±2.1% vs. post-I/R, 3.5±2.2%) and TUDCA (pre-I/R, 5.6 ± 2.1% vs. post-I/R, 3.9±2.1%; P = 0.8) conditions. Similarly, endothelium-independent vasodilation did not differ between conditions (placebo, 19.6±4.8% vs. TUDCA, 19.7±6.1%; P = 0.9). Taken together, endoplasmic reticulum stress does not appear to contribute to endothelial I/R injury in healthy young adults.
AB - Endoplasmic reticulum stress contributes to ischemia-reperfusion (I/R) injury in rodent and cell models. However, the contribution of endoplasmic reticulum stress in the pathogenesis of endothelial I/R injury in humans is unknown. We tested the hypothesis that compared with placebo, inhibition of endoplasmic reticulum stress via ingestion of tauroursodeoxycholic acid would prevent the attenuation of endothelium-dependent vasodilation following I/R injury. Twelve young adults (6 women) were studied following ingestion of a placebo or 1,500 mg tauroursodeoxycholic acid (TUDCA). Endothelium-dependent vasodilation was assessed via brachial artery flow-mediated dilation (duplex ultrasonography) before and after I/R injury, which was induced by 20 min of arm ischemia followed by 20 min of reperfusion. Endothelium-independent vasodilation (glyceryl trinitrate-mediated vasodilation) was also assessed after I/R injury. Compared with placebo, TUDCA ingestion increased circulating plasma concentrations by 145±90 ng/ml and increased concentrations of the taurine unconjugated form, ursodeoxycholic acid, by 560±156 ng/ml (both P < 0.01). Ischemia-reperfusion injury attenuated endothelium-dependent vasodilation, an effect that did not differ between placebo (pre-I/R, 5.0±2.1% vs. post-I/R, 3.5±2.2%) and TUDCA (pre-I/R, 5.6 ± 2.1% vs. post-I/R, 3.9±2.1%; P = 0.8) conditions. Similarly, endothelium-independent vasodilation did not differ between conditions (placebo, 19.6±4.8% vs. TUDCA, 19.7±6.1%; P = 0.9). Taken together, endoplasmic reticulum stress does not appear to contribute to endothelial I/R injury in healthy young adults.
KW - Endoplasmic reticulum stress
KW - Flow-mediated dilation
KW - Ischemia-reperfusion
KW - Tauroursodeoxycholic acid
UR - http://www.scopus.com/inward/record.url?scp=85097571311&partnerID=8YFLogxK
U2 - 10.1152/AJPREGU.00257.2020
DO - 10.1152/AJPREGU.00257.2020
M3 - Article
C2 - 33074709
AN - SCOPUS:85097571311
SN - 0363-6119
VL - 319
SP - R666-R672
JO - American Journal of Physiology - Regulatory Integrative and Comparative Physiology
JF - American Journal of Physiology - Regulatory Integrative and Comparative Physiology
IS - 6
ER -