Projects per year
Abstract
Increased stiffness of large arteries in chronic kidney disease (CKD) has significant clinical implications. This study investigates the temporal development of thoracic aortic dysfunction in a rodent model of CKD, the Lewis polycystic kidney (LPK) rat. Animals aged 12 and 18 weeks were studied alongside age-matched Lewis controls (total n = 94). LPK rodents had elevated systolic blood pressure, left ventricular hypertrophy and progressively higher plasma creatinine and urea. Relative to Lewis controls, LPK exhibited reduced maximum aortic vasoconstriction (Rmax) to noradrenaline at 12 and 18 weeks, and to K+ (12 weeks). Sensitivity to noradrenaline was greater in 18-week-old LPK vs. age matched Lewis (effective concentration 50%: 24 × 10-9 ± 78 × 10-10 vs. 19 × 10-8 ± 49 × 10-9, P < 0.05). Endothelium-dependent (acetylcholine) and -independent (sodium nitroprusside) relaxation was diminished in LPK, declining with age (12 vs. 18 weeks Rmax: 80 ± 8% vs. 57 ± 9% and 92 ± 6% vs. 70 ± 9%, P < 0.05, respectively) in parallel with the decline in renal function. L-Arginine restored endothelial function in LPK, and L-NAME blunted acetylcholine relaxation in all groups. Impaired nitric oxide synthase (NOS) activity was recovered with L-Arginine plus L-NAME in 12, but not 18-week-old LPK. Aortic calcification was increased in LPK rats, as was collagen I/III, fibronectin and NADPH-oxidase subunit p47 (phox) mRNAs. Overall, our observations indicate that the vascular abnormalities associated with CKD are progressive in nature, being characterized by impaired vascular contraction and relaxation responses, concurrent with the development of endothelial dysfunction, which is likely driven by evolving deficits in NO signaling.
Original language | English |
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Article number | 150 |
Pages (from-to) | 1-13 |
Number of pages | 13 |
Journal | Frontiers in Physiology |
Volume | 6 |
DOIs | |
Publication status | Published - 2015 |
Bibliographical note
Copyright the Author(s) 2015. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.Fingerprint
Dive into the research topics of 'Abnormalities associated with progressive aortic vascular dysfunction in chronic kidney disease'. Together they form a unique fingerprint.Projects
- 1 Finished
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Vascular and neurogenic determinants of hypertension in chronic kidney disease
Phillips, J. K., Avolio, A., Pilowsky, P., Murphy, T. & MQRES, M.
1/01/12 → 31/12/15
Project: Research