Effects of the calcium-regulating glycoprotein hormone stanniocalcin-1 within the nucleus of the solitary tract on arterial pressure and the baroreceptor reflex

Neuroscience
John CirielloG F Wagner

Abstract

Receptors for the calcium-regulating glycoprotein hormone stanniocalcin-1 (STC-1) have been found within the CNS and whether these receptors exist within the nucleus of the solitary tract (NTS), and their possible role in the regulation of arterial pressure (AP) is unknown. Experiments were done in the rat to: (1) map the distribution of STC-1 receptors throughout NTS using in situ ligand binding that uses a stanniocalcin-alkaline phosphatase (STC-AP) fusion protein; (2) determine whether protein and gene expression for STC-1 exists within NTS using immunohistochemistry, Western blot and real time qPCR; (3) determine the effect of microinjection of STC-1 into NTS on AP and the baroreflex. Cells exhibiting STC-1 binding sites were found mainly within the caudal medial (Sm), gelantinous and commissural subnuclei of NTS. Cells containing STC-1 immunoreactivity were found to overlap those regions of NTS that contained STC-1 receptors. STC-1 protein and gene expression were also found within caudal NTS. In chloralose-urethane-anesthetized rats, microinjections of STC-1 (1.76-176 nM; 20 nl) into the caudal Sm elicited a dose-related decrease in AP. In contrast, injections of a nonbioactive form of STC-1 (STC-1+guanosine 5'-triphospha...Continue Reading

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Citations

Jul 24, 2013·Molecular and Cellular Endocrinology·Alice Y LawGraham F Wagner
Aug 31, 2012·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Jason M MoreauJohn Ciriello

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