Advancing age decreases pressure-sensitive modulation of calcium signaling in the endothelium of intact and pressurized arteries

Calum Wilson, Christopher D. Saunter, John M. Girkin, John G. McCarron

Research output: Contribution to journalArticle

7 Citations (Scopus)
75 Downloads (Pure)

Abstract

Aging is the summation of many subtle changes which result in altered cardiovascular function. Impaired endothelial function underlies several of these changes and precipitates plaque development in larger arteries. The endothelium transduces chemical and mechanical signals to changes in cytoplasmic calcium concentration to control vascular function. However, studying endothelial calcium signaling in larger arteries in a physiological configuration is challenging because of the requirement to focus through the artery wall. Here, pressure- and agonist-sensitive endothelial calcium signaling was studied in pressurized-carotid arteries from Young (3 months) and Aged (18 months) rats by imaging from within the artery using GRIN fluorescence microendoscopy. Endothelial sensitivity to acetylcholine increased with age. The number of cells exhibiting oscillatory calcium signals, and the frequency of oscillations, were unchanged with age. However,the latency of calcium responses was significantly increased by age. Acetylcholine-evoked endothelial calcium signals were suppressed by increased intraluminal pressure. However, pressure-dependent inhibition of calcium signaling was substantially reduced by age. While each of these changes will increase endothelial calcium signaling in age, decreases in endothelial pressure sensitivity may manifest as a loss of functionality and responsiveness in aging.
Original languageEnglish
Pages (from-to)358–369
Number of pages12
JournalJournal of Vascular Research
Volume53
Issue number5-6
Early online date19 Jan 2017
DOIs
Publication statusPublished - 30 Jan 2017

Keywords

  • endothelial function
  • calcium signaling
  • imaging
  • aging
  • vascular function
  • arteries

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