کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2023330 | 1542440 | 2008 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synaptic interaction between ghrelin- and ghrelin-containing neurons in the rat hypothalamus Synaptic interaction between ghrelin- and ghrelin-containing neurons in the rat hypothalamus](/preview/png/2023330.png)
Synaptic relationships between ghrelin-like immunoreactive axon terminals and other neurons in the hypothalamic arcuate nucleus (ARC) were studied using immunostaining methods at the light and electron microscope levels. Many ghrelin-like immunoreactive axon terminals were found to be in apposition to ghrelin-like immunoreactive neurons at the light microscopic level. At the electron microscopic level, ghrelin-like immunoreactive axon terminals were found to make synapses on ghrelin-like immunoreactive cell bodies and dendrites in the ARC. While the axo-dendritic synapses between ghrelin- and ghrelin-like immunoreactive neurons were mostly the asymmetric type, the axo-somatic synapses were both asymmetric and symmetric type of synapses. Ghrelin at 10− 10 M increased cytosolic Ca2+ concentration ([Ca2+]i) in the neurons isolated from the ARC, some of which were immunocytochemically identified as ghrelin-positive. Ghrelin at 10− 10 M also increased [Ca2+]i in 12% of ghrelin-like immunoreactive neurons in the ARC. These findings suggest that ghrelin serves as a transmitter and/or modulator that stimulates [Ca2+]i signaling in ghrelin neurons of the ARC, which may participate in the orexigenic action of ghrelin. Our data suggests a possibility of existing a novel circuit implicating regulation of feeding and/or energy metabolism.
Journal: Regulatory Peptides - Volume 145, Issues 1–3, 10 January 2008, Pages 122–127