Nov 14, 2014

Noradrenergic plasticity of olfactory sensory neuron inputs to the main olfactory bulb

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
Dennis Eckmeier, Stephen D Shea

Abstract

Sensory responses are modulated by internal factors including attention, experience, and brain state. This is partly due to fluctuations in neuromodulatory input from regions such as the noradrenergic locus ceruleus (LC) in the brainstem. LC activity changes with arousal and modulates sensory processing, cognition, and memory. The main olfactory bulb (MOB) is richly targeted by LC fibers and noradrenaline profoundly influences MOB circuitry and odor-guided behavior. Noradrenaline-dependent plasticity affects the output of the MOB; however. it is unclear whether noradrenergic plasticity also affects the input to the MOB from olfactory sensory neurons (OSNs) in the glomerular layer. Noradrenergic terminals are found in the glomerular layer, but noradrenaline receptors do not seem to acutely modulate OSN terminals in vitro. We investigated whether noradrenaline induces plasticity at the glomerulus. We used wide-field optical imaging to measure changes in odor responses following electrical stimulation of LC in anesthetized mice. Surprisingly, odor-evoked intrinsic optical signals at the glomerulus were persistently weakened after LC activation. Calcium imaging selectively from OSNs confirmed that this effect was due to suppression...Continue Reading

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Mentioned in this Paper

Fluctuation
Calcium [EPC]
Entire Brainstem
Structure of Olfactory Bulb
Calcium
Renal Glomerular Disease
Smell Perception
Odors
Optical Imaging
Neuronal Plasticity

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