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Hypothalamic-Pituitary Axis

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.

Physiological Foundation of Stress

Physiological Foundation of Stress

Stress triggers a coordinated physiological response involving the sympathetic nervous system (SNS) and the hypothalamic-pituitary-adrenal (HPA) axis. This dual activation ensures that the body is prepared for both immediate and prolonged stress management. The process begins with the perception of a stressor. This initial phase activates the SNS, leading to the rapid release of adrenaline (epinephrine) from the adrenal glands.
Role of the Sympathetic Nervous System
Adrenaline triggers the...

Hormones of the Adrenal Glands

Hormones of the Adrenal Glands

Adrenal hormones play a pivotal role in maintaining the body's electrolyte balance and orchestrating responses to stress, showcasing the intricate functions of the adrenal cortex and medulla.
The adrenal cortex, a powerhouse of hormone synthesis, generates over two dozen corticosteroid hormones. The zona glomerulosa produces mineralocorticoids, exemplified by aldosterone, influencing the electrolyte composition of body fluids. The synthesis of glucocorticoids such as cortisol and corticosterone...

Regulation of Angiogenesis and Blood Supply

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...

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...

Adrenergic Receptors: β Subtype

Adrenergic Receptors: β Subtype

β-adrenoceptors have varied sensitivities towards adrenaline, noradrenaline, and isoprenaline. The order of agonist potency is as follows:
Isoprenaline > Adrenaline > Noradrenaline
Neurotransmitter binding to these receptors causes activation of adenylyl cyclase resulting in increased concentrations of cAMP and modulation of calcium ion channels within the cell. They are further classified into β1, β2, and β3 subtypes.
β1-adrenoceptors: β1-adrenoceptors have equal affinities for...

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Related Experiment Video

Updated: Jun 7, 2026

Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis

Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis

Published on: June 3, 2016

Stress and adrenergic function: HIF1α, a potential regulatory switch.

Dona Lee Wong¹, T C Tai, David C Wong-Faull

¹Department of Psychiatry, Harvard Medical School, Laboratory of Molecular and Developmental Neurobiology, McLean Hospital, 115 Mill Street, MRC Rm 116, Mail Stop 144, Belmont, MA 02478, USA. dona_wong@hms.harvard.edu

Cellular and Molecular Neurobiology

|November 4, 2010

Summary

This summary is machine-generated.

Hypoxia activates epinephrine production by stimulating transcription factors Egr-1 and Sp1, indirectly regulating the PNMT gene. This pathway, controlled by HIF1α, offers a potential therapeutic target for stress-related illnesses.

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Restraint to Induce Stress in Mice and Rats

Restraint to Induce Stress in Mice and Rats

Published on: December 6, 2024

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Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis

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Published on: June 3, 2016

Restraint to Induce Stress in Mice and Rats

Restraint to Induce Stress in Mice and Rats

Published on: December 6, 2024

Area of Science:

Neuroendocrinology
Molecular Biology
Stress Physiology

Background:

Stress triggers epinephrine and cortisol release for the
fight or flight
response.
Stress hormones like epinephrine are implicated in various diseases, including cardiovascular and immune dysfunction.
Phenylethanolamine N-methyltransferase (PNMT) regulates epinephrine biosynthesis and is influenced by stress.

Purpose of the Study:

To investigate the molecular mechanisms by which hypoxic stress regulates PNMT gene expression.
To identify the role of transcription factors and signaling pathways in hypoxia-induced PNMT activation.
To explore HIF1α as a potential therapeutic target for stress-related adrenergic dysfunction.

Main Methods:

Utilized immobilization stress in rats to study PNMT mRNA and protein expression.
Employed PC12 cells to examine PNMT promoter activity under hypoxic conditions.
Investigated signaling pathways (cAMP, PLC, MAPK) and transcription factors (HIF1α, Egr-1, Sp1) using reporter assays and siRNA knockdown.

Main Results:

Hypoxic stress increases PNMT expression via cAMP and PLC signaling pathways.
HIF1α, Egr-1, and Sp1 are crucial for hypoxia-induced PNMT activation.
Egr-1 and Sp1 binding sites are essential for HIF1α to stimulate the PNMT promoter.

Conclusions:

Hypoxia activates the PNMT gene indirectly through HIF1α-mediated stimulation of Egr-1 and Sp1.
HIF1α acts as a key regulator of adrenergic responses to stress.
HIF1α represents a potential therapeutic target for stress-induced illnesses involving adrenergic dysfunction.