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Midbrain adrenergic mechanism modulating predatory attack behaviour induced by hypothalamic stimulation

S Saha¹, S K Manchanda, S C Bhatia

¹Department of Physiology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi.

Indian Journal of Physiology and Pharmacology

|April 1, 1993

Summary

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Norepinephrine (NE) in the dorsal periaqueductal gray (dPAG) reduces the brain stimulation needed for predatory attacks in cats. Beta-blockers like propranolol (Prop) block this effect, suggesting NE

Area of Science:

Neuroscience
Behavioral Neuroscience
Neuropharmacology

Background:

Spontaneous predatory attacks in cats are rare.
Lateral hypothalamic stimulation can elicit predatory attacks.

Purpose of the Study:

To investigate the role of norepinephrine (NE) and beta-adrenergic mechanisms in the dorsal periaqueductal gray (dPAG) in hypothalamically induced predatory attacks.

Main Methods:

Predatory attacks were elicited in cats via lateral hypothalamic stimulation.
Norepinephrine (NE) and propranolol (Prop) were microinjected into the dPAG.
Current strength required for attack elicitation was measured.

Main Results:

NE microinjections significantly reduced the current strength needed for predatory attacks.

Related Experiment Videos

Propranolol (Prop) microinjections significantly blocked the predatory attack response.

Control injections of saline and propylene glycol had no effect.

Conclusions:

Beta-adrenoceptive mechanisms within the dPAG are involved in hypothalamically induced predatory aggressive responses.
Norepinephrine plays a role in modulating these aggressive behaviors via beta-adrenergic pathways.