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1 School of Mathematics & Statistics, University of Sydney, Sydney, Australia
2 Department of Physiology & Cell Biology, Ohio State University, Columbus, Ohio, United States
3 Department of Neuroscience, Ohio State University, Columbus, Ohio, United States
* To whom correspondence should be addressed. E-mail: boulant.1{at}osu.edu.
Thermoregulatory responses are partially controlled by the preoptic area and anterior hypothalamus (PO/AH), which contains a mixed population of temperature sensitive and insensitive neurons. Immunohistochemical procedures identified the extent of various ionic channels in rat PO/AH neurons. These included pacemaker current channels (i.e., HCN or hyperpolarization-activated cyclic nucleotide-gated channels), background potassium leak channels (TASK-1 and TRAAK), and transient receptor potential channel TRPV4. PO/AH neurons showed dense TASK-1 and HCN-2 immunoreactivity and moderate TRAAK and HCN-4 immunoreactivity. In contrast, the neuronal cell bodies did not label for TRPV4, but instead, punctate labeling was observed in traversing axons or their terminal endings. Based on these results and previous electrophysiological studies, Hodgkin-Huxley-like models were constructed. These models suggest that most PO/AH neurons have the same types of ionic channels, but different levels of channel expression can explain the inherent properties of the various types of temperature sensitive and insensitive neurons.
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