Sleep disturbance among spontaneously hypertensive rats is mediated by an α1-adrenergic mechanism

Terry B J Kuo, Chun Yu Chen, Chun Ting Lai, Tsai Yu Chuan, Wen Yi Wu, Shih Chih Tsai, Cheryl C H Yang

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Background Inadequate sleep may aggravate hypertension, but the pathophysiology of sleep disturbance in hypertension remains unknown. Among spontaneously hypertensive rats (SHR), sleep disturbance co-occurred with sympathetic hyperactivity; therefore, we hypothesized that the sleep disturbance can be alleviated by antagonizing the adrenergic overdrive. MethodsPolysomnographic recording was performed in SHR by telemetry. The animals were first injected with saline, and 2 days later with a hypotensive agent. Cardiac and vascular sympathetic activity were assessed using the normalized low-frequency power (LF%) of heart rate variability and the low-frequency power of arterial pressure variability (BLF), respectively.ResultsA comparison was made between the saline and hypotensive drug treatments. During quiet sleep (QS), the α1-blocker prazosin induced a significant decrease in BLF, but had no effect on LF%. The total time and bout duration of QS were lengthened and QS interruption was reduced (P 0.05 for all). When both α1-and α2-adrenoceptors were blocked by phentolamine, both BLF and LF% were lower (P 0.05 for both), but no modification to sleep structure could be observed. To antagonize Β-adrenergic activity, atenolol and propranolol were injected. The LF% after either antagonist treatment was significantly decreased; however, sleep structure was not significantly changed. The QS-promoting effect of prazosin is specific to SHR, because prazosin is ineffective when administered to Wistar-Kyoto rats.Conclusionsα1-adrenergic antagonism may reverse, at least partially, the poor sleep quality of SHR, suggesting a vicious cycle can be established between adrenergic overdrive and sleep disturbance.

Original languageEnglish
Pages (from-to)1110-1117
Number of pages8
JournalAmerican Journal of Hypertension
Volume25
Issue number10
DOIs
Publication statusPublished - Oct 2012
Externally publishedYes

Keywords

  • β-adrenergic antagonist
  • â-adrenergic antagonist
  • blood pressure
  • hypertension
  • sleep
  • spontaneously hypertensive rat
  • sympathetic activity
  • telemetry

ASJC Scopus subject areas

  • Internal Medicine

Fingerprint Dive into the research topics of 'Sleep disturbance among spontaneously hypertensive rats is mediated by an α1-adrenergic mechanism'. Together they form a unique fingerprint.

Cite this