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beta-Adrenergic response in mouse CNS reaggregate cultures
Brain Research
|February 1, 1982
Summary
Mouse embryonic brain cells in culture show a beta-adrenergic response, with receptors and signaling appearing around the time of birth. This study characterizes these receptors in developing brain tissue.
Area of Science:
- Neuroscience
- Pharmacology
- Developmental Biology
Background:
- Primary reaggregate cultures from embryonic mouse brains are used to study neuronal development.
- Beta-adrenergic receptors play crucial roles in neuronal function and development.
Purpose of the Study:
- To investigate the presence and characteristics of beta-adrenergic receptors and responses in cultured embryonic mouse brain reaggregates.
- To determine the developmental timing of beta-adrenergic signaling in the embryonic brain.
Main Methods:
- Preparation of primary reaggregate cultures from 17-day embryonic mouse brains.
- Measurement of cyclic adenosine monophosphate (cAMP) production in response to isoproterenol.
- Characterization of beta-adrenergic receptors using [125I]iodohydroxybenzylpindolol (IHYP) binding assays.
Main Results:
- Isoproterenol stimulated cAMP production 3-4 fold over basal levels after 10 days in culture.
- The beta-adrenergic response was rapid and blocked by propranolol.
- Beta-adrenergic receptors exhibited a dissociation constant (Kd) of 100-300 pM and a maximum density of 80-110 fmol/mg protein.
- Both receptor presence and functional response emerged around the time equivalent to birth.
Conclusions:
- Cultured embryonic mouse brain reaggregates develop functional beta-adrenergic receptors and signaling pathways.
- These systems mature and become responsive around the perinatal period, mirroring in vivo development.