Basic fibroblast growth factor increases nitric oxide and endothelin production in rat aorta

Area of Science:

• Cardiovascular Physiology
• Endocrinology
• Molecular Biology

Background:

• Hypertension is associated with altered vascular function, including nitric oxide (NO) and endothelin production.
• Basic fibroblast growth factor (bFGF) plays a role in vascular health and disease.
• The specific effects of bFGF on NO and endothelin in the context of hypertension require further investigation.

Purpose of the Study:

• To investigate the effect of basic fibroblast growth factor (bFGF) on aortic nitric oxide (NO) and endothelin production.
• To compare these effects in spontaneously hypertensive rats (SHR) and normotensive WKY rats.

Main Methods:

• Rat aortic slices from SHR and WKY rats were incubated with varying concentrations of bFGF (10 or 100 ng/ml) for 6 hours.
• Nitric oxide synthase (NOS) activity in aortic slices was measured.
• Concentrations of NO and endothelin in the incubation medium were determined.

Main Results:

• SHR aortas exhibited lower NOS activity and reduced NO production but higher endothelin levels compared to WKY rats.
• bFGF treatment significantly increased NOS activity and NO production in both SHR and WKY rat aortas.
• bFGF also increased endothelin production in both rat models, with more pronounced effects in WKY rats at higher doses.

Conclusions:

• Basic fibroblast growth factor (bFGF) demonstrates a modulatory effect on both nitric oxide (NO) and endothelin production in rat aortas.
• These findings suggest bFGF could be a potential therapeutic target for managing vascular dysfunction in hypertension.
• Further research is warranted to elucidate the precise mechanisms underlying bFGF's actions in different hypertensive models.