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Related Experiment Videos

Regulated expression of alpha2B adrenoceptor during development.

Guey-Shin Wang1, Nan-Chi Chang, Shinn-Chih Wu

  • 1Institute of Neuroscience, National Yang-Ming University, Taipei, Taiwan, Republic of China.

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|September 21, 2002
PubMed
Summary

This study maps the expression of the alpha2B adrenoceptor gene (Adra2b) in the developing mouse central nervous system using transgenic mice. Findings reveal specific patterns of Adra2b expression correlating with noradrenergic innervation during development.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Alpha2 adrenoceptors (alpha2A, alpha2B, alpha2C) mediate epinephrine and norepinephrine effects via G protein-coupled pathways.
  • Understanding alpha2B adrenoceptor subtype gene (Adra2b) regulation in the central nervous system (CNS) is crucial.

Purpose of the Study:

  • To delineate the regulatory mechanism of alpha2B adrenoceptor subtype expression in the CNS.
  • To establish transgenic mouse lines for tracing Adra2b expression patterns during development.

Main Methods:

  • Generation of transgenic (Tg) mice carrying an Adra2b promoter-reporter gene (NN-lacZ) construct.
  • In situ analysis of beta-galactosidase activity (X-gal staining) to visualize Adra2b expression.
  • Examination of expression patterns from embryonic day 9.5 (E9.5) to postnatal day 28 (P28).

Related Experiment Videos

  • Colocalization studies using tyrosine hydroxylase or dopamine-beta-hydroxylase immunocytochemistry.

    • Main Results:

    • Significant Adra2b expression detected in dorsal root ganglion and cranial nerves V and VII by E12.5.
    • Expression observed in cerebral cortex, olfactory nucleus, hypothalamus, brainstem, and cerebellar Purkinje cells by E18.5, persisting postnatally.
    • Adra2b expression initiated in the hippocampal dentate gyrus at P4, aligning with granule neuron development.
    • Transgene expression expanded to the septum and thalamus from P7 onwards.
    • Expression patterns correlated with noradrenergic innervation sites.

    Conclusions:

    • The Adra2b promoter directs selective reporter gene expression in the developing CNS.
    • The study provides a detailed spatiotemporal map of Adra2b expression during mouse development.
    • Findings suggest a role for alpha2B adrenoceptors in specific neuronal populations and developmental processes.