HCN1 ion channel immunoreactivity in spinal cord and medulla oblongata

Brain Research
Carol J MilliganJim Deuchars

Abstract

Hyperpolarization-activated cyclic nucleotide-gated (HCN) non-selective cation channels in neurons carry currents proposed to perform diverse functions, including the hyperpolarization activated Ih current. The 4 HCN subunits have unique but overlapping patterns of expression in the CNS. Here, we examined the distribution of HCN1 channel subunits in the brainstem and spinal cord using immunohistochemistry. At all levels of the spinal cord dorsal horn, HCN1 immunoreactivity (HCN1-IR) was predominantly absent from laminae I and II, while a dense band of punctate labeling was visible in lamina III. Labeled neurons were identified in close vicinity to the central canal, in the lateral spinal nucleus, in the ventral horn and occasionally in lamina II and III. Those in the ventral horn were identified as alpha motor neurons using retrograde tracing and/or double or triple immunostaining with neuronal markers neurofilament 200 (NF200) and choline acetyltransferase. HCN1-IR neurons in the brainstem included neurons in sensory pathways such as the dorsal column nuclei, the area postrema, the spinal trigeminal nucleus as well as identified motor neurons in motor nuclei. In the nucleus ambiguus, a mixed visceral/motor nucleus, HCN1-IR was...Continue Reading

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