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Spectral Confocal Imaging of Fluorescently tagged Nicotinic Receptors in Knock-in Mice with Chronic Nicotine Administration
Published on: February 10, 2012
Two week nicotine treatment selectively increases bone vascular constriction in response to norepinephrine
J B A Feitelson1, P P Rowell, C S Roberts
1Department of Physiology and Biophysics, 1115A, Health Sciences Center, University of Louisville, KY 40292, USA.
Summary
Nicotine treatment amplifies norepinephrine-induced bone vasoconstriction, potentially reducing bone blood flow. This effect is not linked to nitric oxide pathways, suggesting altered alpha-adrenergic receptor signaling.
Area of Science:
- Vascular Physiology
- Pharmacology
- Bone Biology
Background:
- Nicotine is a major component of tobacco smoke.
- Tobacco use is associated with adverse bone health outcomes.
- The impact of nicotine on bone vasculature requires elucidation.
Purpose of the Study:
- To investigate nicotine's effect on bone blood vessel function.
- To determine if nicotine alters vasoconstrictor and vasodilator responses in bone vasculature.
- To explore the mechanisms underlying nicotine's impact on bone blood flow regulation.
Main Methods:
- Subcutaneous nicotine administration to male rats for two weeks.
- In vivo assessment of arterial blood pressure and tibial perfusion using laser Doppler flowmetry.
- Evaluation of responses to norepinephrine, arginine vasopressin, acetylcholine, and sodium nitroprusside.
- Western blot analysis of endothelial nitric oxide synthase protein expression.
Main Results:
- Nicotine significantly enhanced bone vascular constriction in response to norepinephrine (NE), but not arginine vasopressin (AVP).
- Nicotine did not alter vasodilation induced by acetylcholine (ACh) or sodium nitroprusside (SNP).
- Enhanced NE-induced constriction was independent of nitric oxide pathways.
Conclusions:
- Nicotine selectively accentuates the constrictor response to NE in the bone vasculature.
- The mechanism likely involves alterations in NE-specific signaling, potentially alpha-adrenergic receptors.
- Nicotine's augmentation of NE-induced constriction may lead to chronic reduction in bone blood flow.
