Cardio-Renal Effects of Short-Term Fructose Treatment in Hypertensive Rats: Focused on NO/ROS Balance

Area of Science:

• Cardiovascular Science
• Metabolic Research
• Renal Physiology

Background:

• Short-term fructose consumption may disrupt the nitric oxide (NO)/reactive oxygen species (ROS) balance.
• These disruptions may precede observable hemodynamic alterations.

Purpose of the Study:

• To investigate the effects of short-term fructose exposure on redox balance and lipid profiles in Wistar Kyoto (WKY) and spontaneously hypertensive rats (SHR).
• To determine if fructose intake alters blood pressure, oxidative stress markers, and nitric oxide synthase (NOS) activity.

Main Methods:

• Rats (WKY and SHR) received 10% fructose solution or tap water for 3 weeks.
• Measurements included blood pressure, plasma lipids, tissue conjugated dienes, NADPH oxidase, SOD, NF-kappaB protein expression, and NOS activity.

Main Results:

• Fructose did not alter blood pressure but increased kidney-to-body-weight ratio in SHR.
• Dyslipidemia (altered HDL, cholesterol, VLDL, triglycerides) and increased renal oxidative stress (NADPH oxidase upregulation, SOD downregulation) were observed.
• Nitric oxide synthase (NOS) activity decreased in the heart and kidneys.

Conclusions:

• Short-term, moderate fructose intake induces strain-dependent dyslipidemia and renal oxidative stress.
• Reduced NOS activity and altered redox balance occur early, even without blood pressure changes.
• The kidney is more susceptible to fructose-induced oxidative stress, especially in hypertensive rats, highlighting the NO/ROS axis as a therapeutic target.