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Raphe gene expression changes implicate immune-related functions in ventilatory plasticity following carotid body denervation in rats. Exp Neurol 2017 Jan;287(Pt 2):102-112 PMID: 27132994 PMCID: PMC5086315

Abstract

The regulation of blood gases in mammals requires precise feedback mechanisms including chemoreceptor feedback from the carotid bodies. Carotid body denervation (CBD) leads to immediate hypoventilation (increased PaCO2) in adult rats, but over a period of days and weeks ventilation normalizes due in part to central (brain) mechanisms. Here, we tested the hypothesis that functional ventilatory recovery following CBD correlated with significant shifts in medullary raphe gene expression of molecules/pathways associated with known or novel forms of neuroplasticity. Tissue punches were obtained from snap frozen brainstems collected from rats 1-2days or 14-15days post-sham or post-bilateral CBD surgery (verified by physiologic measurements), and subjected to mRNA sequencing to identify, quantify, and statistically compare gene expression level differences among these groups of rats. We found the greatest number of gene expression changes acutely after CBD (154 genes), with fewer changes in the weeks after CBD (69-80 genes) and the fewest changes in expression among the time control groups (39 genes). Little or no changes were observed for multiple genes associated with serotonin- or glutamate receptor-dependent forms of neuroplasticity. However, an unbiased assessment of gene expression changes using a bioinformatics pathway analysis highlighted multiple changes in gene expression in signaling pathways associated with immune function. These included several growth factors and cytokines associated with peripheral and innate immune systems. Thus, these medullary raphe gene expression data support a role for immune-related signaling pathways in the functional restoration of blood gas control after CBD, but little or no role for serotonin- or glutamate receptor-mediated plasticity.

Author List

Mouradian GC Jr, Liu P, Hodges MR

Author

Matthew R. Hodges PhD Associate Professor in the Physiology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Animals
Carotid Body
Denervation
Disease Models, Animal
Gene Expression Regulation
Male
Neuronal Plasticity
RNA, Messenger
Raphe Nuclei
Rats
Rats, Sprague-Dawley
Receptors, Glutamate
Receptors, Serotonin
Recovery of Function
Respiration
Serotonin
Serotonin Plasma Membrane Transport Proteins
Time Factors



View this publication's entry at the Pubmed website PMID: 27132994
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