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Sympathetic Signaling

Sympathetic Signaling

Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
Sympathetic preganglionic fibers release the neurotransmitter acetylcholine (ACh) onto the ganglionic neurons in the...

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In Vivo Gene Transfer to the Rabbit Common Carotid Artery Endothelium

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Sympathetic cotransmission in rabbit saphenous artery in vitro: effect of electric stimulation and potentiation by

W Zhang¹, L M Ren

¹Department of Pharmacology, School of Pharmacy, Hebei Medical University, Shijiazhuang 050017, China.

Acta Pharmacologica Sinica

|December 26, 2001

Summary

This summary is machine-generated.

Electrical stimulation of rabbit arteries reveals that ATP is the sole transmitter for vasoconstriction at 2 Hz. Higher frequencies involve both norepinephrine and ATP, with P2X1 receptor desensitization enhancing vascular responses.

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Area of Science:

Vascular pharmacology
Neurotransmission

Background:

Sympathetic nerves control vascular tone through neurotransmitters.
Purinergic signaling, involving adenosine triphosphate (ATP), also contributes to vasoconstriction.
Understanding cotransmission is crucial for cardiovascular research.

Purpose of the Study:

To investigate the roles of norepinephrine and ATP in rabbit saphenous artery vasoconstriction.
To analyze cotransmission characteristics during electric field stimulation.
To elucidate the frequency-dependent mechanisms of vascular contraction.

Main Methods:

Isometric tension recording of rabbit saphenous arterial rings.
Electric field stimulation to activate sympathetic nerves.
Pharmacological blockade using prazosin (alpha1-adrenoceptor antagonist) and alpha,beta-methylene ATP (P2X1 receptor desensitization).

Main Results:

Electric stimulation induced frequency-dependent vasoconstriction.
Prazosin partially inhibited vasoconstriction at higher frequencies (8-16 Hz).
Alpha,beta-methylene ATP abolished responses at 2 Hz and potentiated responses at 16 Hz, indicating distinct roles for ATP at different frequencies.

Conclusions:

ATP is the primary transmitter for vasoconstriction at 2 Hz via sympathetic nerve stimulation.
At higher frequencies (8-16 Hz), both norepinephrine and ATP contribute to vasoconstriction.
P2X1 receptor desensitization potentiates vascular responses through a presynaptic mechanism, highlighting complex purinergic-adrenergic interactions.