Pressor recovery after acute stress is impaired in high fructose-fed Lean Zucker rats

Jennifer A. Thompson, Gerard D'Angelo, James D. Mintz, David J. Fulton, David W. Stepp

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Insulin resistance is a powerful predictor of cardiovascular disease; however, the mechanistic link remains unclear. This study aims to determine if early cardiovascular changes associated with short-term fructose feeding in the absence of obesity manifest as abnormal blood pressure control. Metabolic dysfunction was induced in Lean Zucker rats by short-term high-fructose feeding. Rats were implanted with telemetry devices for the measurement of mean arterial blood pressure (MAP) and subjected to air jet stress at 5 and 8 weeks after feeding. Additional animals were catheterized under anesthesia for the determination of MAP and blood flow responses in the hind limb and mesenteric vascular beds to intravenous injection of isoproterenol (0.001–0.5 μm), a β-adrenergic agonist. Metabolic dysfunction in high-fructose rats was not accompanied by changes in 24-h MAP. Yet, animals fed a high-fructose diet for 8 weeks exhibited a marked impairment in blood pressure recovery after air-jet stress. Dose-dependent decreases in MAP and peripheral blood flow in response to isoproterenol treatment were significantly attenuated in high-fructose rats. These data suggest that impaired blood pressure recovery to acute mental stress precedes the onset of hypertension in the early stages of insulin resistance. Further, blunted responses to isoproterenol implicate β2-adrenergic sensitivity as a possible mechanism responsible for altered blood pressure control after short-term high-fructose feeding.

Original languageEnglish (US)
Article numbere12758
JournalPhysiological reports
Volume4
Issue number12
DOIs
StatePublished - Jun 1 2016

Fingerprint

Zucker Rats
Fructose
Arterial Pressure
Isoproterenol
Blood Pressure
Insulin Resistance
Air
Telemetry
Adrenergic Agonists
Intravenous Injections
Adrenergic Agents
Blood Vessels
Cardiovascular Diseases
Extremities
Anesthesia
Obesity
Diet
Hypertension
Equipment and Supplies

Keywords

  • Fructose
  • insulin resistance
  • pressor responses
  • stress
  • β-adrenergic

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Cite this

Pressor recovery after acute stress is impaired in high fructose-fed Lean Zucker rats. / Thompson, Jennifer A.; D'Angelo, Gerard; Mintz, James D.; Fulton, David J.; Stepp, David W.

In: Physiological reports, Vol. 4, No. 12, e12758, 01.06.2016.

Research output: Contribution to journalArticle

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