Journal article
Localized Suppression of Cortical Growth Hormone-Releasing Hormone Receptors State-Specifically Attenuates Electroencephalographic Delta Waves
The Journal of neuroscience, Vol.30(11), pp.4151-4159
03/17/2010
Handle:
https://hdl.handle.net/2376/115606
PMID: 20237285
Abstract
Growth hormone-releasing hormone (GHRH) promotes non-rapid eye movement sleep (NREMS), in part via a well characterized hypothalamic sleep-promoting site. However, GHRH may also act in the cortex to influence sleep. Application of GHRH to the surface of the cortex changes electroencephalographic (EEG) delta power. GHRH and the GHRH receptor (GHRHR) mRNAs are detectable in the rat cortex, and the expression of cortical GHRHR is activity dependent. Here, we microinjected a GHRH antagonist or GHRHR small interfering RNA (siGHRHR) onto the somatosensory cortex surface in rats. The unilateral application of the GHRH antagonist ipsilaterally decreased EEG delta wave power during NREMS, but not wakefulness, during the initial 40 min after injection. Similarly, the injection of siGHRHR reduced cortical expression of GHRHR and suppressed NREMS EEG delta wave power during 20–24 h after injection. Using the fura-2 calcium imaging technique, cultured cortical cells responded to GHRH by increasing intracellular calcium. Approximately 18% of the GHRH-responsive cells were GABAergic as illustrated by glutamic acid decarboxylase-67 (GAD67) immunostaining. Double labeling for GAD67 and GHRHR
in vitro
and
in vivo
indicated that only a minority of cortical GHRHR-containing cells were GABAergic. Our data suggest that endogenous cortical GHRH activates local cortical cells to affect EEG delta wave power state-specifically. Results are also consistent with the hypothesis that GHRH contributes to local network state regulation.
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Details
- Title
- Localized Suppression of Cortical Growth Hormone-Releasing Hormone Receptors State-Specifically Attenuates Electroencephalographic Delta Waves
- Creators
- Fan Liao - Sleep and Performance Research Center, Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, College of Veterinary Medicine, Washington State University, Pullman, Washington 99164-6520Ping Taishi - Sleep and Performance Research Center, Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, College of Veterinary Medicine, Washington State University, Pullman, Washington 99164-6520Lynn Churchill - Sleep and Performance Research Center, Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, College of Veterinary Medicine, Washington State University, Pullman, Washington 99164-6520Marcus J Urza - Sleep and Performance Research Center, Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, College of Veterinary Medicine, Washington State University, Pullman, Washington 99164-6520James M Krueger - Sleep and Performance Research Center, Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, College of Veterinary Medicine, Washington State University, Pullman, Washington 99164-6520
- Publication Details
- The Journal of neuroscience, Vol.30(11), pp.4151-4159
- Academic Unit
- Integrative Physiology and Neuroscience, Department of
- Publisher
- Society for Neuroscience
- Identifiers
- 99900547584501842
- Language
- English
- Resource Type
- Journal article