کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2848474 | 1167424 | 2007 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Is ATP a suitable co-transmitter in carotid body arterial chemoreceptors? Is ATP a suitable co-transmitter in carotid body arterial chemoreceptors?](/preview/png/2848474.png)
A review is presented on carotid body ATP content, effects and release, receptors involved and results of their block by purinergic antagonists, and the possibility of cholinergic–purinergic co-transmission in the carotid body. Glomus cells release ACh and ATP upon physiological stimulation. Both agents and their agonists have chemo-excitatory actions and their combined effects disappear upon blocking n-ACh and P2X receptors. Both ACh and ATP also are capable of exciting the somata of chemosensory neurons of petrosal ganglia. Although a combined cholinergic–purinergic block suppresses the chemosensory activity in neurons co-cultured with glomus cells and some carotid body preparations in vitro, basal chemosensory activity and chemosensory responses to hypoxic stimuli persist in cat carotid body preparations in situ and in vitro. Therefore, ATP is an effective excitatory agent for carotid body chemosensory activity, although less potent than ACh; their joint participation may contribute to – but does not entirely explain – the transfer of chemoreceptor excitation from glomus cells to sensory endings in carotid body.
Journal: Respiratory Physiology & Neurobiology - Volume 157, Issue 1, 1 July 2007, Pages 106–115