Journal article
Vascular and neural dysfunction in Zucker diabetic fatty rats: a difficult condition to reverse
Diabetes, obesity & metabolism, Vol.10(1), pp.64-74
Received 21 January 2007; accepted 26 February 2007
01/2008
DOI: 10.1111/j.1463-1326.2007.00814.x
PMID: 17970755
Abstract
Aim: We had previously demonstrated that vascular and neural dysfunction in Zucker diabetic fatty (ZDF) rats is progressive. In this study, we sought to determine whether monotherapy of ZDF rats can reverse the vascular and nerve defects.
Methods: ZDF rats at 16 weeks of age were treated for 12 weeks with the angiotensin-converting enzyme inhibitor enalapril, the antioxidant alpha-lipoic acid, the HMG-CoA reductase inhibitor rosuvastatin or the PPARgamma agonist rosiglitazone. Vasodilation of epineurial arterioles was measured by videomicroscopy. Endoneurial blood flow (EBF) was measured by hydrogen clearance, and nerve conduction velocity was measured following electrical stimulation of motor or sensory nerves.
Results: Motor nerve conduction velocity (MNCV), sensory nerve conduction velocity (SNCV) (70 and 77% of control, respectively), EBF (64% of control), and vascular relaxation in response to acetylcholine (50% of control) and calcitonin gene-related peptide (CGRP; 73% of control) are impaired in ZDF rats at 28 weeks of age compared with lean littermate controls. Treatment with enalapril and alpha-lipoic acid attenuated the decrease in MNCV and SNCV. Enalapril, alpha-lipoic acid and rosiglitazone treatment of ZDF rats were partially effective in improving endothelium-dependent vascular dysfunction as measured by vascular relaxation in response to acetylcholine. The same drugs also attenuated the decrease in EBF. However, impairment in vascular relaxation in response to CGRP was improved with only alpha-lipoic acid or rosuvastatin treatment. The increase in superoxide and nitrotyrosine levels in vascular tissue was attenuated by all treatments.
Conclusions: The efficacy of monotherapy treatment of ZDF rats using different classes of drugs for vascular and neural dysfunction once complications have developed did not achieve expected levels. This could be because of the complex aetiology of vascular and neural disease in type 2 diabete
Details
- Title: Subtitle
- Vascular and neural dysfunction in Zucker diabetic fatty rats: a difficult condition to reverse
- Creators
- C. L Oltman - Veteran Affairs Medical Center, University of Iowa, Iowa City, IA, USAE. P Davidson - Veteran Affairs Medical Center, University of Iowa, Iowa City, IA, USAL. J Coppey - Veteran Affairs Medical Center, University of Iowa, Iowa City, IA, USAT. L Kleinschmidt - Veteran Affairs Medical Center, University of Iowa, Iowa City, IA, USAD. D Lund - Veteran Affairs Medical Center, University of Iowa, Iowa City, IA, USAE. T Adebara - Department of Internal Medicine, University of Iowa, Iowa City, IA, USAM. A Yorek - Veteran Affairs Medical Center, University of Iowa, Iowa City, IA, USA
- Resource Type
- Journal article
- Publication Details
- Diabetes, obesity & metabolism, Vol.10(1), pp.64-74
- Edition
- Received 21 January 2007; accepted 26 February 2007
- Publisher
- Blackwell Publishing Ltd
- DOI
- 10.1111/j.1463-1326.2007.00814.x
- PMID
- 17970755
- ISSN
- 1462-8902
- eISSN
- 1463-1326
- Number of pages
- 11
- Language
- English
- Date published
- 01/2008
- Academic Unit
- Fraternal Order of Eagles Diabetes Research Center; Endocrinology and Metabolism; Internal Medicine
- Record Identifier
- 9984094667702771
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