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Related Experiment Video

Updated: Dec 7, 2025

Optogenetic Manipulation of Neuronal Activity to Modulate Behavior in Freely Moving Mice

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Published on: October 27, 2020

Modulation of anxiety behavior in gonadectomized animals.

Roghaieh Khakpay¹, Fatemeh Khakpai²

¹Department of Animal Biology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran, khakpai@iautmu.ac.ir.

Acta Neurobiologiae Experimentalis

|September 29, 2020

Summary

Opioids and androgens reduce anxiety-like behaviors. Gonadectomy increases anxiety, but testosterone and opioid antagonists can reverse these effects, suggesting hormonal roles in anxiety modulation.

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Area of Science:

Neuroscience
Behavioral Endocrinology
Psychopharmacology

Background:

Anxiety is a complex emotional state influenced by stress, neurotransmitters, and brain activity.
Opioids and androgens are known to modulate anxiety-like behaviors in humans and animals.
Gonadectomy (testes removal) in males leads to increased anxiety-like behaviors.

Purpose of the Study:

To review the effects of morphine (an opioid) and androgens on anxiety behavior in gonadectomized animals.
To highlight the role of opioid drugs and androgens in modulating anxiety.
To discuss the functional consequences of gonadectomy on anxiety behavior and the potential adaptive roles of opioids and androgens.

Main Methods:

Literature review focusing on studies involving gonadectomized animals.
Analysis of research on the effects of opioid administration (e.g., morphine) on anxiety.
Examination of studies investigating androgen administration (e.g., testosterone) and opioid antagonist effects.

Main Results:

Opioids and androgens generally decrease anxiety-like behaviors.
Gonadectomy significantly increases anxiety-like behaviors in animal models.
Administration of testosterone or opioid antagonists can partially reverse anxiety behaviors induced by gonadectomy.

Conclusions:

Opioid and androgen systems play a crucial role in regulating anxiety-like behaviors.
Hormonal changes, particularly androgen deficiency post-gonadectomy, contribute to heightened anxiety.
These neurochemical and hormonal pathways may be involved in adaptive responses to stressful situations.