Related Experiment Video

Updated: Aug 8, 2026

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices
11:13

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices

Published on: April 6, 2016

Interferon-alpha and transforming growth factor-beta 1 regulate corticotropin-releasing factor release from the

J Raber1, G F Koob, F E Bloom

  • 1Department of Neuropharmacology, Scripps Research Institute, La Jolla, California, USA.

Neurochemistry International
|April 1, 1997
PubMed

Insights

Interferon-alpha stimulates stress-related factor release from the amygdala and hypothalamus. Transforming growth factor-beta 1 selectively blocks acetylcholine-induced release, suggesting a role in modulating the neuroendocrine-immune axis.

Area of Science:

  • Neuroendocrinology
  • Neuroimmunology
  • Molecular Psychiatry

Background:

  • Interferon-alpha (IFN-alpha) and transforming growth factor-beta 1 (TGF-beta 1) are cytokines found in brain regions.
  • The amygdala, rich in corticotropin-releasing factor (CRF), is central to stress responses.
  • IFN-alpha releases arginine vasopressin (AVP) from the amygdala and hypothalamus, indicating neuroimmune roles.

Purpose of the Study:

  • To compare the effects of IFN-alpha and TGF-beta 1 on in vitro CRF release from the amygdala and hypothalamus.
  • To investigate the involvement of guanylate cyclase-mediated signaling in cytokine-induced CRF release.

Main Methods:

  • In vitro study of CRF release from rat amygdala and hypothalamus.
  • Treatment with IFN-alpha, TGF-beta 1, Interleukin-2 (IL-2), and acetylcholine.
  • Assessment of guanylate cyclase inhibitors and cGMP accumulation.

Main Results:

  • IFN-alpha stimulated CRF release from both amygdala and hypothalamus.
  • CRF release induced by IFN-alpha, IL-2, and acetylcholine was blocked by guanylate cyclase inhibitors.
  • TGF-beta 1 did not affect basal or IL-2-induced CRF release but blocked acetylcholine-induced CRF release.

Conclusions:

  • IFN-alpha promotes CRF release via guanylate cyclase-mediated signaling.
  • TGF-beta 1 antagonizes acetylcholine-evoked CRF and AVP release, potentially modulating HPA axis activation.
  • The amygdala plays a key role in bidirectional communication within the neuroendocrine-immune system.

More Related Videos

Simultaneous Detection of c-Fos Activation from Mesolimbic and Mesocortical Dopamine Reward Sites Following Naive Sugar and Fat Ingestion in Rats08:07

Simultaneous Detection of c-Fos Activation from Mesolimbic and Mesocortical Dopamine Reward Sites Following Naive Sugar and Fat Ingestion in Rats

Published on: August 24, 2016

Primary Culture of Rat Adrenocortical Cells and Assays of Steroidogenic Functions04:33

Primary Culture of Rat Adrenocortical Cells and Assays of Steroidogenic Functions

Published on: March 12, 2019

Related Concept Videos

Feedback Loops01:01

Feedback Loops

In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a particular substance, like a hormone, to maintain a certain level before triggering a signal that results in a decrease in further release of the hormone.
Hypothalamic-Pituitary Axis01:37

Hypothalamic-Pituitary Axis

The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.
TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
Regulation of Hormone Secretion01:19

Regulation of Hormone Secretion

Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
Humoral stimuli,...
Regulation of Food Intake01:30

Regulation of Food Intake

Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
Cushing Syndrome II: Pathophysiology01:19

Cushing Syndrome II: Pathophysiology

Cortisol production is normally governed by the hypothalamic–pituitary–adrenal (HPA) axis, which maintains hormonal balance through tightly regulated feedback mechanisms. Disruption of this regulatory system is central to the development of Cushing syndrome, whether the excess cortisol originates from external medications or internal pathology. Persistent cortisol elevation alters metabolism, immune function, and endocrine signaling, producing the characteristic clinical features of the...