β2-Adrenergic receptor supports prolonged theta tetanus-induced LTP

J Neurophysiol. 2012 May;107(10):2703-12. doi: 10.1152/jn.00374.2011. Epub 2012 Feb 15.

Abstract

The widespread noradrenergic innervation in the brain promotes arousal and learning by molecular mechanisms that remain largely undefined. Recent work shows that the β(2)-adrenergic receptor (β(2)AR) is linked to the AMPA-type glutamate receptor subunit GluA1 via stargazin and PSD-95 (Joiner ML, Lise MF, Yuen EY, Kam AY, Zhang M, Hall DD, Malik ZA, Qian H, Chen Y, Ulrich JD, Burette AC, Weinberg RJ, Law PY, El-Husseini A, Yan Z, Hell JW. EMBO J 29: 482-495, 2010). We now demonstrate that the β(2)AR plays a prominent role in long-term potentiation (LTP) induced by a train of 900 stimuli at 5 Hz (prolonged theta-tetanus-LTP, or PTT-LTP) in the hippocampal CA1 region in mice, which requires simultaneous β-adrenergic stimulation. Although PTT-LTP was impaired in hippocampal slices from β(1)AR and β(2)AR knockout (KO) mice, only β(2)AR-selective stimulation with salbutamol supported this PTT-LTP in wild-type (WT) slices, whereas β(1)AR-selective stimulation with dobutamine (+ prazosin) did not. Furthermore, only the β(2)AR-selective antagonist ICI-118551 and not the β(1)AR-selective antagonist CGP-20712 inhibited PTT-LTP and phosphorylation of GluA1 on its PKA site S845 in WT slices. Our analysis of S845A knockin (KI) mice indicates that this phosphorylation is relevant for PTT-LTP. These results identify the β(2)AR-S845 signaling pathway as a prominent regulator of synaptic plasticity.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adrenergic beta-1 Receptor Agonists / pharmacology
  • Adrenergic beta-Antagonists / pharmacology
  • Animals
  • CA1 Region, Hippocampal / drug effects
  • CA1 Region, Hippocampal / physiology*
  • Dobutamine / pharmacology
  • Electric Stimulation
  • Imidazoles / pharmacology
  • Long-Term Potentiation / drug effects
  • Long-Term Potentiation / physiology*
  • Mice
  • Mice, Knockout
  • Phosphorylation / drug effects
  • Phosphorylation / physiology
  • Propanolamines / pharmacology
  • Rabbits
  • Receptors, Adrenergic, beta / metabolism*
  • Synapses / drug effects
  • Synapses / physiology
  • Synaptic Transmission / drug effects
  • Synaptic Transmission / physiology

Substances

  • Adrenergic beta-1 Receptor Agonists
  • Adrenergic beta-Antagonists
  • Imidazoles
  • Propanolamines
  • Receptors, Adrenergic, beta
  • Dobutamine
  • ICI 118551
  • CGP 20712A