Effects of kappa and delta opioid agonists on activity and thermosensitivity of rat hypothalamic neurons

Brain Research
K S YakimovaF K Pierau

Abstract

Extracellular recordings were made from 161 warm-sensitive, six cold-sensitive and 153 temperature-insensitive neurons in slices of the preoptic area/anterior hypothalamus (PO/AH) of rats, to investigate the effects of the kappa-receptor opioid agonist dynorphin A1-17 and the delta-receptor opioid agonist DPDPE on neuronal response characteristics. While 61% of the neurons exhibited kappa-receptors, delta-receptors were only present in 37% of the neurons. No co-localization was observed between kappa- and delta-receptors, whereas mu-receptors could be co-localized with kappa- as well as delta-receptors. Antagonistic effects on tonic activity were induced by different concentrations of the kappa-agonist dynorphin A1-17. At 0.5 nM, the excitatory effect was predominant, while 50% of the neurons were already inhibited at 5 nM and inhibition was the major effect at 100 nM. A significant increase in temperature sensitivity was observed in warm-sensitive neurons during administration of 0.5 nM dynorphin A1-17; in contrast, the temperature sensitivity was significantly decreased at the high dose of 100 nM. In most of the neurons responding to the delta-receptor agonist DPDPE (0.5-100 nM) the firing rate was decreased. The temperature ...Continue Reading

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Citations

Jun 24, 2009·Brain Research·Carolina da Silveira ScarpelliniKênia C Bícego
Mar 4, 2000·Peptides·A L VaccarinoA J Kastin
Jun 7, 2005·Brain Research·Scott Manning RawlsAlan Cowan
Jan 31, 2002·Anesthesiology·Jan De Witte, Daniel I Sessler
Jan 28, 2018·Pflügers Archiv : European journal of physiology·Jan Siemens, Gretel B Kamm
Apr 3, 2001·The Journal of Comparative Neurology·M HallbeckA Blomqvist
Apr 15, 2006·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Eckhart Simon
Jun 19, 2021·Neuroscience and Biobehavioral Reviews·Matteo CerriRoberto Amici

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