Ageing of the vascular endothelium: a novel role for CaMKIIδ

Claire McCluskey, Margaret Macdonald, Susan Currie

Research output: Contribution to journalMeeting abstract

Abstract

Calcium/calmodulin–dependent protein kinase II delta (CaMKIIδ) plays a pivotal role in cardiovascular health and disease. Whether CaMKIIδ modulates impaired function in ageing cardiovasculature is unknown. This study investigates cardiac and aortic CaMKIIδ expression and activation in aged rats. Cardiovascular function was assessed in vivo by echocardiography. Reduced fractional shortening (63.2±1.3 vs 50.6±1.9 (%FS), young vs aged (n=12), p<0.01) and increased heart weight:body weight (2.7±0.2 vs 3.6±0.1, young vs aged (n=6), p<0.05) were observed in aged animals suggesting cardiac remodelling. Increased blood flow through the ascending aorta was also observed in aged rats (76.7±3.1 vs 103.4±7.4 (ml/min), young vs. aged (n=12), p<0.05). Parallel investigation of CaMKIIδ in cardiac and aortic tissue revealed increased protein expression (1.03±0.1 vs11.7±0.2, (n=7) p<0.05 (cardiac); 1.1±0.1 vs. 1.3±0.1 (aortic), young vs. aged (n=6) (CaMKIIδ/GAPDH)). Further analysis of aortic tissue showed increased activation of CaMKII with elevations in phosphorylated and oxidised CaMKII (ox-CaMKII) expression (1.2±0.1 vs 1.8±0.2 (n=5) p<0.05; 1.0±0.1 vs 1.3±0.08 (n=5) p<0.05, young vs. aged) as well as increased kinase activity (5.9±1.2 vs 8.2±1.4 (pmolPO4-inc/min/μg protein) young vs.aged, (n=3)). To explore these novel observations in the vasculature further, endothelial cells from young and aged aortae were isolated. These cells displayed striking phenotypic differences between groups with aged cells displaying clear signs of necrosis. To investigate whether ox-CaMKII may contribute to deterioration of the endothelium in ageing, initial experiments studied young endothelial cells exposed to H2O2 (10 µM). Reactive oxygen species and ox-CaMKII expression were measured in parallel and a corresponding increase in both parameters occurred following treatment (2.5 × 103 vs 4.4 × 104 (fluorescence a.u.) control vs treated, (n=3), p<0.01; 1.1±0.2 vs 1.82±0.1 (ox-CaMKII/GAPDH), control vs treated), p<0.001, (n=3)). This work provides new evidence that CaMKIIδ expression and activation are augmented in aged vasculature. Future work will examine CaMKII in aged endothelial cells to provide mechanistic insight into the deterioration of vascular function.
LanguageEnglish
Article number3
PagesA2
Number of pages1
JournalHeart
Volume103
Issue numberS2
DOIs
Publication statusPublished - 1 Apr 2017
EventScottish Cardiovascular Forum 2017 - University of Glasgow, Glasgow, United Kingdom
Duration: 4 Feb 20174 Feb 2017

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Calcium-Calmodulin-Dependent Protein Kinase Type 2
Vascular Endothelium
Endothelial Cells
Aorta
Endothelium
Blood Vessels
Echocardiography
Reactive Oxygen Species
Proteins
Necrosis
Cardiovascular Diseases
Phosphotransferases
Fluorescence
Body Weight
Weights and Measures
Health

Keywords

  • Calcium/calmodulin–dependent protein kinase II delta
  • ageing cardiovasculature
  • vascular function
  • aortic tissue

Cite this

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title = "Ageing of the vascular endothelium: a novel role for CaMKIIδ",
abstract = "Calcium/calmodulin–dependent protein kinase II delta (CaMKIIδ) plays a pivotal role in cardiovascular health and disease. Whether CaMKIIδ modulates impaired function in ageing cardiovasculature is unknown. This study investigates cardiac and aortic CaMKIIδ expression and activation in aged rats. Cardiovascular function was assessed in vivo by echocardiography. Reduced fractional shortening (63.2±1.3 vs 50.6±1.9 ({\%}FS), young vs aged (n=12), p<0.01) and increased heart weight:body weight (2.7±0.2 vs 3.6±0.1, young vs aged (n=6), p<0.05) were observed in aged animals suggesting cardiac remodelling. Increased blood flow through the ascending aorta was also observed in aged rats (76.7±3.1 vs 103.4±7.4 (ml/min), young vs. aged (n=12), p<0.05). Parallel investigation of CaMKIIδ in cardiac and aortic tissue revealed increased protein expression (1.03±0.1 vs11.7±0.2, (n=7) p<0.05 (cardiac); 1.1±0.1 vs. 1.3±0.1 (aortic), young vs. aged (n=6) (CaMKIIδ/GAPDH)). Further analysis of aortic tissue showed increased activation of CaMKII with elevations in phosphorylated and oxidised CaMKII (ox-CaMKII) expression (1.2±0.1 vs 1.8±0.2 (n=5) p<0.05; 1.0±0.1 vs 1.3±0.08 (n=5) p<0.05, young vs. aged) as well as increased kinase activity (5.9±1.2 vs 8.2±1.4 (pmolPO4-inc/min/μg protein) young vs.aged, (n=3)). To explore these novel observations in the vasculature further, endothelial cells from young and aged aortae were isolated. These cells displayed striking phenotypic differences between groups with aged cells displaying clear signs of necrosis. To investigate whether ox-CaMKII may contribute to deterioration of the endothelium in ageing, initial experiments studied young endothelial cells exposed to H2O2 (10 µM). Reactive oxygen species and ox-CaMKII expression were measured in parallel and a corresponding increase in both parameters occurred following treatment (2.5 × 103 vs 4.4 × 104 (fluorescence a.u.) control vs treated, (n=3), p<0.01; 1.1±0.2 vs 1.82±0.1 (ox-CaMKII/GAPDH), control vs treated), p<0.001, (n=3)). This work provides new evidence that CaMKIIδ expression and activation are augmented in aged vasculature. Future work will examine CaMKII in aged endothelial cells to provide mechanistic insight into the deterioration of vascular function.",
keywords = "Calcium/calmodulin–dependent protein kinase II delta , ageing cardiovasculature, vascular function, aortic tissue",
author = "Claire McCluskey and Margaret Macdonald and Susan Currie",
year = "2017",
month = "4",
day = "1",
doi = "10.1136/heartjnl-2017-311433.3",
language = "English",
volume = "103",
pages = "A2",
journal = "Heart",
issn = "1355-6037",
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}

Ageing of the vascular endothelium : a novel role for CaMKIIδ. / McCluskey, Claire; Macdonald, Margaret; Currie, Susan.

In: Heart , Vol. 103, No. S2, 3, 01.04.2017, p. A2.

Research output: Contribution to journalMeeting abstract

TY - JOUR

T1 - Ageing of the vascular endothelium

T2 - Heart

AU - McCluskey, Claire

AU - Macdonald, Margaret

AU - Currie, Susan

PY - 2017/4/1

Y1 - 2017/4/1

N2 - Calcium/calmodulin–dependent protein kinase II delta (CaMKIIδ) plays a pivotal role in cardiovascular health and disease. Whether CaMKIIδ modulates impaired function in ageing cardiovasculature is unknown. This study investigates cardiac and aortic CaMKIIδ expression and activation in aged rats. Cardiovascular function was assessed in vivo by echocardiography. Reduced fractional shortening (63.2±1.3 vs 50.6±1.9 (%FS), young vs aged (n=12), p<0.01) and increased heart weight:body weight (2.7±0.2 vs 3.6±0.1, young vs aged (n=6), p<0.05) were observed in aged animals suggesting cardiac remodelling. Increased blood flow through the ascending aorta was also observed in aged rats (76.7±3.1 vs 103.4±7.4 (ml/min), young vs. aged (n=12), p<0.05). Parallel investigation of CaMKIIδ in cardiac and aortic tissue revealed increased protein expression (1.03±0.1 vs11.7±0.2, (n=7) p<0.05 (cardiac); 1.1±0.1 vs. 1.3±0.1 (aortic), young vs. aged (n=6) (CaMKIIδ/GAPDH)). Further analysis of aortic tissue showed increased activation of CaMKII with elevations in phosphorylated and oxidised CaMKII (ox-CaMKII) expression (1.2±0.1 vs 1.8±0.2 (n=5) p<0.05; 1.0±0.1 vs 1.3±0.08 (n=5) p<0.05, young vs. aged) as well as increased kinase activity (5.9±1.2 vs 8.2±1.4 (pmolPO4-inc/min/μg protein) young vs.aged, (n=3)). To explore these novel observations in the vasculature further, endothelial cells from young and aged aortae were isolated. These cells displayed striking phenotypic differences between groups with aged cells displaying clear signs of necrosis. To investigate whether ox-CaMKII may contribute to deterioration of the endothelium in ageing, initial experiments studied young endothelial cells exposed to H2O2 (10 µM). Reactive oxygen species and ox-CaMKII expression were measured in parallel and a corresponding increase in both parameters occurred following treatment (2.5 × 103 vs 4.4 × 104 (fluorescence a.u.) control vs treated, (n=3), p<0.01; 1.1±0.2 vs 1.82±0.1 (ox-CaMKII/GAPDH), control vs treated), p<0.001, (n=3)). This work provides new evidence that CaMKIIδ expression and activation are augmented in aged vasculature. Future work will examine CaMKII in aged endothelial cells to provide mechanistic insight into the deterioration of vascular function.

AB - Calcium/calmodulin–dependent protein kinase II delta (CaMKIIδ) plays a pivotal role in cardiovascular health and disease. Whether CaMKIIδ modulates impaired function in ageing cardiovasculature is unknown. This study investigates cardiac and aortic CaMKIIδ expression and activation in aged rats. Cardiovascular function was assessed in vivo by echocardiography. Reduced fractional shortening (63.2±1.3 vs 50.6±1.9 (%FS), young vs aged (n=12), p<0.01) and increased heart weight:body weight (2.7±0.2 vs 3.6±0.1, young vs aged (n=6), p<0.05) were observed in aged animals suggesting cardiac remodelling. Increased blood flow through the ascending aorta was also observed in aged rats (76.7±3.1 vs 103.4±7.4 (ml/min), young vs. aged (n=12), p<0.05). Parallel investigation of CaMKIIδ in cardiac and aortic tissue revealed increased protein expression (1.03±0.1 vs11.7±0.2, (n=7) p<0.05 (cardiac); 1.1±0.1 vs. 1.3±0.1 (aortic), young vs. aged (n=6) (CaMKIIδ/GAPDH)). Further analysis of aortic tissue showed increased activation of CaMKII with elevations in phosphorylated and oxidised CaMKII (ox-CaMKII) expression (1.2±0.1 vs 1.8±0.2 (n=5) p<0.05; 1.0±0.1 vs 1.3±0.08 (n=5) p<0.05, young vs. aged) as well as increased kinase activity (5.9±1.2 vs 8.2±1.4 (pmolPO4-inc/min/μg protein) young vs.aged, (n=3)). To explore these novel observations in the vasculature further, endothelial cells from young and aged aortae were isolated. These cells displayed striking phenotypic differences between groups with aged cells displaying clear signs of necrosis. To investigate whether ox-CaMKII may contribute to deterioration of the endothelium in ageing, initial experiments studied young endothelial cells exposed to H2O2 (10 µM). Reactive oxygen species and ox-CaMKII expression were measured in parallel and a corresponding increase in both parameters occurred following treatment (2.5 × 103 vs 4.4 × 104 (fluorescence a.u.) control vs treated, (n=3), p<0.01; 1.1±0.2 vs 1.82±0.1 (ox-CaMKII/GAPDH), control vs treated), p<0.001, (n=3)). This work provides new evidence that CaMKIIδ expression and activation are augmented in aged vasculature. Future work will examine CaMKII in aged endothelial cells to provide mechanistic insight into the deterioration of vascular function.

KW - Calcium/calmodulin–dependent protein kinase II delta

KW - ageing cardiovasculature

KW - vascular function

KW - aortic tissue

UR - http://heart.bmj.com/content/103/Suppl_2/A2.1

UR - https://www.scf.strath.ac.uk/

U2 - 10.1136/heartjnl-2017-311433.3

DO - 10.1136/heartjnl-2017-311433.3

M3 - Meeting abstract

VL - 103

SP - A2

JO - Heart

JF - Heart

SN - 1355-6037

IS - S2

M1 - 3

ER -