Abstract
Apnea is a common complication of respiratory syncytial virus (RSV) infection in young infants. The purpose of this study was to determine whether this infection affects apnea triggered by sensorineural stimulation in weanling rats. We also studied which neurotransmitters are involved in this response and whether passive prophylaxis with a specific neutralizing antibody (palivizumab) confers protection against it. Weanling rats were inoculated intranasally with RSV, adenovirus, or virus-free medium. Changes in respiratory rate and apnea in response to nerve stimulation with increasing doses of capsaicin were measured by plethysmography. Capsaicin-induced apnea was significantly longer in RSV-infected rats at postinoculation days 2 (upper airways infection) and 5 (lower airways infection), and apnea-related mortality occurred only in the RSV-infected group. Reduction in the duration of apnea was observed after selective inhibition of central γ-aminobutyric acid (GABA) type A receptors and neurokinin type 1 receptors for substance P. Prophylactic palivizumab protected against apnea and apnea-related mortality. These results suggest that sensorineural stimulation during RSV infection is associated with the development of apnea and apnea-related death in early life, whose mechanism involves the release of GABA acting on central GABA type A receptors and substance P acting on neurokinin type 1 receptors.
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Abbreviations
- CGRP:
-
calcitonin gene-related peptide
- GABA:
-
γ-aminobutyric acid
- GABAA:
-
γ-aminobutyric acid receptor type A
- NK1:
-
neurokinin 1
- RSV:
-
respiratory syncytial virus
- SID:
-
sudden infant death
- TRPV:
-
transient receptor potential channel, vanilloid subfamily
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Acknowledgements
We acknowledge the technical assistance of Dorothy Hehre and Carlos Devia. We also thank Judith McCullough, Ph.D., and James Wilkinson, M.D., M.P.H., for help with the statistical analysis.
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This research was supported in part by a grant from the National Institutes of Health (NHLBI HL-61007) and a research grant from MedImmune, Inc., to G.P.
Some of the findings reported in this paper were presented at the American Thoracic Society Conference; Seattle, WA; May 16–21, 2003.
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Sabogal, C., Auais, A., Napchan, G. et al. Effect of Respiratory Syncytial Virus on Apnea in Weanling Rats. Pediatr Res 57, 819–825 (2005). https://doi.org/10.1203/01.PDR.0000157679.67227.11
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DOI: https://doi.org/10.1203/01.PDR.0000157679.67227.11
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