RGD Reference Report - A high-potassium diet reduces infarct size and improves vascular structure in hypertensive rats. - Rat Genome Database
Submit Data |  Help |  Video Tutorials |  News |  Publications |  FTP Download |  REST API |  Citing RGD |  Contact   

A high-potassium diet reduces infarct size and improves vascular structure in hypertensive rats.

Authors: Dorrance, AM  Pollock, DM  Romanko, OP  Stepp, DW 
Citation: Dorrance AM, etal., Am J Physiol Regul Integr Comp Physiol. 2007 Jan;292(1):R415-22. Epub 2006 Aug 17.
RGD ID: 11084934
Pubmed: (View Article at PubMed) PMID:16917016
DOI: Full-text: DOI:10.1152/ajpregu.00438.2005

High-potassium diets can improve vascular function, yet the effects of potassium supplementation on ischemic stroke have not been studied. We hypothesized that dietary potassium supplementation would reduce ischemic cerebral infarct size by reversing cerebral artery hypertrophy. Six-week-old male stroke-prone spontaneously hypertensive rats (SHRSP) were fed diets containing 0.79% potassium (LK) or 2.11% potassium (HK) for 6 wk; Wistar-Kyoto (WKY) rats were fed the LK diet. The HK diet did not reduce blood pressure, as measured by telemetry, in the SHRSP. Cerebral ischemia was induced by middle cerebral artery (MCA) occlusion. The resultant infarct was smaller in the HK-SHRSP than in the LK-SHRSP: 55.1 +/- 6.3 vs. 71.4 +/- 2.4% of the hemisphere infarcted (P < 0.05). Infarcts were smaller in WKY rats (33.5 +/- 4.8%) than in LK-SHRSP or HK-SHRSP. The vessel wall of MCAs from LK-SHRSP was hypertrophied compared with WKY rats; this was reversed in HK-SHRSP. RT-PCR analysis of the cerebral vessels showed that expression of platelet-derived growth factor receptors-alpha and -beta, epidermal growth factor receptor, and collagen I and III was increased in the vessels from LK-SHRSP compared with WKY rats and reduced in HK-SHRSP. These results suggest that potassium supplementation provides neuroprotection in a model of ischemic stroke independent of blood pressure and possibly through changes in vascular structure.

Annotation

Disease Annotations    

Objects Annotated

Genes (Rattus norvegicus)
Pdgfra  (platelet derived growth factor receptor alpha)
Pdgfrb  (platelet derived growth factor receptor beta)

Genes (Mus musculus)
Pdgfra  (platelet derived growth factor receptor, alpha polypeptide)
Pdgfrb  (platelet derived growth factor receptor, beta polypeptide)

Genes (Homo sapiens)
PDGFRA  (platelet derived growth factor receptor alpha)
PDGFRB  (platelet derived growth factor receptor beta)


Additional Information