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Interactions between orexin-immunoreactive fibers and adrenaline or noradrenaline-expressing neurons of the lower brainstem in rats and mice.

Peptides. 2010 Aug;31(8):1589-97. Epub 2010 Apr 29
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摘要


Orexins are expressed in neurons of the dorsolateral hypothalamus and their axons widely distribute throughout the central nervous system. The noradrenergic cell groups of the lower brainstem belong to the targets of these orexin projections. Double immunostainings for orexin and phenylethanolamine N-methyltransferase (PNMT), as well as orexin and tyrosine hydroxylase (TH) were applied to demonstrate the orexinergic innervation of catecholamine cell groups in the lower brainstem of the mouse and the rat. In various densities, networks of orexin-positive fibers and terminals were present on neurons of each adrenaline (C1, C2, C3) and noradrenaline (locus coeruleus, A1, A2, A4, A5 and A7) cell groups. The most dense networks of orexin fibers and terminals were detected in the locus coeruleus, the subcoeruleus area, and in the nucleus of the solitary tract. By using confocal microscope to analyze triple immunostainings we could detect that about two-third of the orexin-PNMT or orexin-TH immunopositive close contacts contained synaptophysin (a presynapse-specific protein) in the C1, C2 and C3 adrenaline, or in the A1, A2 noradrenaline cell groups, respectively. Orexin-immunopositive axons in the C1, C2, as well as A1, A2 and A6 cell groups have been examined by an electron microscope. Relatively few asymmetrical (excitatory) synaptic contacts could be demonstrated between PNMT- or TH-positive dendrites and orexin terminals, although the vast majority of orexin-positive axons was located in juxtaposition to PNMT- or TH-positive neurons.

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