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Ascending Aortic Constriction in Rats for Creation of Pressure Overload Cardiac Hypertrophy Model
Published on: June 29, 2014
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Aortic remodelling in chronic nicotine-administered rat.
Satirah Zainalabidin1, Siti Balkis Budin1, Anand Ramalingam1
1Programme of Biomedical Science, School of Diagnostic and Applied Health Sciences, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur 50300, Malaysia.
Summary
Chronic nicotine exposure in rats led to vascular remodelling and hypertension. This impaired aortic function and increased oxidative stress, highlighting nicotine
Area of Science:
- Cardiovascular Biology
- Pharmacology
- Toxicology
Background:
- Vascular remodelling is a key adaptation to circulatory pressure changes.
- Cigarette nicotine use is linked to hypertension, but its direct effects on vascular remodelling are unclear.
Purpose of the Study:
- To investigate the impact of a light smoker's nicotine dosage on rat aortic reactivity, oxidative stress, and vascular structure.
- To elucidate the mechanisms by which nicotine may induce hypertension and alter vascular function.
Main Methods:
- Male Sprague-Dawley rats received daily intraperitoneal injections of either normal saline (control) or 0.6 mg/kg nicotine for 28 days.
- Thoracic aortas were analyzed for histomorphological changes, contractile and relaxation responses, and oxidative stress markers (malondialdehyde, superoxide dismutase, glutathione).
Main Results:
- Nicotine administration significantly increased mean arterial pressure and pulse pressure.
- Vascular remodelling was observed, evidenced by increased tunica media thickness and decreased lumen diameter.
- Nicotine impaired endothelium-dependent relaxation to acetylcholine while enhancing phenylephrine-induced contraction, alongside increased oxidative stress markers and reduced antioxidant capacity.
Conclusions:
- Chronic nicotine exposure at a clinically relevant dose induces vascular remodelling and hypertension in rats.
- Nicotine impairs aortic reactivity and promotes oxidative imbalance, contributing to altered vascular function and increased cardiovascular risk.
