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Adrenergic Receptors: ɑ Subtype01:31

Adrenergic Receptors: ɑ Subtype

Adrenoceptors are classified into α and ꞵ classes based on their potencies to catecholamine agonists. α-adrenoceptors show the following order of catecholamine potency:
Adrenaline ≥ Noradrenaline >> Isoprenaline
α-adrenoceptors are further divided into α1 and α2-adrenoceptors.
α1-Adrenoceptors: These receptors are located postsynaptically on the effector organs and cause constriction of smooth muscle mediated by activation of phospholipase C—inositol-1,4,5-trisphosphate...
Diversity of Archaea II01:24

Diversity of Archaea II

Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
Anatomy of the Adrenal Glands01:17

Anatomy of the Adrenal Glands

The adrenal or supra-renal glands, situated above the kidneys and aligned with the twelfth rib, are paired pyramid-shaped structures crucial for the body's stress response. During stress, these glands secrete hormones vital for adaptive physiological reactions.
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Adrenergic Receptors: β Subtype01:26

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...
Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

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Hormones of the Adrenal Glands

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Updated: Jun 6, 2026

Primary Culture of Rat Adrenocortical Cells and Assays of Steroidogenic Functions
04:33

Primary Culture of Rat Adrenocortical Cells and Assays of Steroidogenic Functions

Published on: March 12, 2019

Adrenarche in comparative perspective.

Benjamin Campbell1

  • 1Department of Anthropology, University of Wisconsin-Milwaukee, 53211, USA. campbelb@uwm.edu

American Journal of Human Biology : the Official Journal of the Human Biology Council
|December 9, 2010
PubMed
Summary
This summary is machine-generated.

Human adrenarche, or adrenal androgen production, coincides with prolonged juvenile brain development, unlike in rats and macaques. This suggests adrenal androgens support extended prefrontal cortex development in humans.

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Using a Comparative Species Approach to Investigate the Neurobiology of Paternal Responses
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Last Updated: Jun 6, 2026

Primary Culture of Rat Adrenocortical Cells and Assays of Steroidogenic Functions
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Published on: March 12, 2019

Using a Comparative Species Approach to Investigate the Neurobiology of Paternal Responses
07:59

Using a Comparative Species Approach to Investigate the Neurobiology of Paternal Responses

Published on: September 19, 2011

Area of Science:

  • Comparative Mammalian Development
  • Neuroendocrinology
  • Evolutionary Biology

Background:

  • Adrenarche, the rise in adrenal androgens, is a key developmental stage.
  • Human brain development, particularly the prefrontal cortex, extends into adolescence.
  • The relationship between adrenarche, brain development, and lactation timing across mammals is not fully understood.

Purpose of the Study:

  • To test the hypothesis that human adrenarche is linked to extended juvenile brain development.
  • To compare the timing of adrenal androgen production, brain development, and lactation in humans, rats, and rhesus macaques.

Main Methods:

  • Literature review comparing developmental timelines.
  • Analysis of adrenal androgen production (androstenedione, DHEAS), brain glucose utilization, and lactation timing.
  • Comparative study across rats, rhesus macaques, and humans.

Main Results:

  • In rats and macaques, adrenal hormone production aligns with weaning and influences synaptic development around that period.
  • Human peak brain glucose utilization occurs post-weaning, with rising adrenal androgens coinciding with declining glucose utilization.
  • Adrenarche in humans is dissociated from lactation timing, unlike in the other species studied.

Conclusions:

  • Human adrenarche and prolonged brain development are associated, but decoupled from lactation timing.
  • Dehydroepiandrosterandrosterone sulfate (DHEAS) may offer neuroprotection for synaptic plasticity in the developing human brain.
  • This supports extended prefrontal cortex development starting around age seven.