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Related Concept Videos

Adrenergic Receptors: β Subtype01:26

Adrenergic Receptors: β Subtype

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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.
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Related Experiment Video

Updated: Dec 25, 2025

Optical Sectioning and Visualization of the Intervertebral Disc from Embryonic Development to Degeneration
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Adrenoceptor Expression during Intervertebral Disc Degeneration.

Johannes Kupka1, Annika Kohler1, Karima El Bagdadi1

  • 1Dr. Rolf M. Schwiete Research Unit for Osteoarthritis, Orthopedic University Hospital Friedrichsheim gGmbH, 60528 Frankfurt/Main, Germany.

International Journal of Molecular Sciences
|March 22, 2020
PubMed
Summary
This summary is machine-generated.

Adrenoceptors (ARs) are present and functional in intervertebral discs (IVDs). Their expression patterns correlate with extracellular matrix changes in degenerating IVDs, suggesting a role in disc degeneration.

Keywords:
IVD degeneration (IVDD)adrenoceptorsintervertebral disc (IVD)sympathicus

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Area of Science:

  • Biomedical research
  • Orthopedics
  • Neuroscience

Background:

  • Intervertebral discs (IVDs) are innervated by sympathetic nerves.
  • Adrenoceptor (AR) expression and function in IVDs remain largely uninvestigated.

Purpose of the Study:

  • To systematically analyze adrenoceptor (AR) gene expression and functionality in human and mouse intervertebral disc (IVD) tissues.
  • To investigate the correlation between AR expression, extracellular matrix (ECM) composition, and IVD degeneration.

Main Methods:

  • Gene expression analysis of ARs in human degenerated IVD tissue and isolated cells.
  • Immunohistochemical staining for ARs and ECM components in human and mouse IVD samples.
  • Norepinephrine stimulation assays on isolated human IVD cells to assess intracellular signaling pathways (ERK1/2, PKA).

Main Results:

  • Multiple AR genes (α1a, α1b, α2a, α2b, α2c, β1, β2) were expressed in human IVD homogenates and cells.
  • β2-AR was detected in human IVD sections, with localization correlating to ECM alterations.
  • In mice, β2-AR expression was stronger in degenerating IVDs, accompanied by specific ECM changes.

Conclusions:

  • This study provides the first evidence for the existence and functionality of adrenoceptors (ARs) in intervertebral disc (IVD) tissue.
  • The findings suggest a potential role for the sympathetic nervous system, via ARs, in the pathogenesis of IVD degeneration.
  • Further research into these cellular mechanisms could lead to novel therapeutic strategies for IVD degeneration.