It has been demonstrated in mammals that the airway hyper-responsiveness, which accompanies viral infections, is the result of increased reflex bronchoconstriction due to inhibition of muscarinic prejunctional receptors, which belong to M2 subtypes. Multiple mechanisms account for virus-induced M2 receptor dysfunction. Viral neuraminidase may deglycosylate the M2 receptor, decreasing acetylcholine affinity. Equine influenza remains a common viral respiratory disease of horses worldwide, which results in loss to the equine industry, by decreasing performance, convalescence time and loss of peak performance due to chronic sequelae, such as airway hyper-responsiveness. The purpose of this study was to evaluate the effect of neuraminidase on equine isolated bronchi, assessed in equine bronchial smooth muscle rings, derived from five healthy equine male lungs. A pretreatment with vehicle did not modify contraction induced by electrical field stimulation (EFS) studies at each frequency tested. A pretreatment with pilocarpine (1-100 mu M) significantly reduced, while methoctramine (1-100 mu M) significantly increased contraction induced by EFS. Finally, neuraminidase (0.5 UI) significantly increased contraction induced by EFS. These results suggest that airway hyper-responsiveness that follows a viral influenza infection might be related to a dysfunction of muscarinic prejunctional receptors. (C) 2008 Published by Elsevier Ltd.

Matera, M., Calzetta, L., Sanduzzi, A., Page, C., & Cazzola, M. (2008). Effects of neuraminidase on equine isolated bronchi. PULMONARY PHARMACOLOGY & THERAPEUTICS, 21(4), 624-629 [10.1016/j.pupt.2008.02.003].

Effects of neuraminidase on equine isolated bronchi

CAZZOLA, MARIO
2008

Abstract

It has been demonstrated in mammals that the airway hyper-responsiveness, which accompanies viral infections, is the result of increased reflex bronchoconstriction due to inhibition of muscarinic prejunctional receptors, which belong to M2 subtypes. Multiple mechanisms account for virus-induced M2 receptor dysfunction. Viral neuraminidase may deglycosylate the M2 receptor, decreasing acetylcholine affinity. Equine influenza remains a common viral respiratory disease of horses worldwide, which results in loss to the equine industry, by decreasing performance, convalescence time and loss of peak performance due to chronic sequelae, such as airway hyper-responsiveness. The purpose of this study was to evaluate the effect of neuraminidase on equine isolated bronchi, assessed in equine bronchial smooth muscle rings, derived from five healthy equine male lungs. A pretreatment with vehicle did not modify contraction induced by electrical field stimulation (EFS) studies at each frequency tested. A pretreatment with pilocarpine (1-100 mu M) significantly reduced, while methoctramine (1-100 mu M) significantly increased contraction induced by EFS. Finally, neuraminidase (0.5 UI) significantly increased contraction induced by EFS. These results suggest that airway hyper-responsiveness that follows a viral influenza infection might be related to a dysfunction of muscarinic prejunctional receptors. (C) 2008 Published by Elsevier Ltd.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore MED/10 - Malattie dell'Apparato Respiratorio
English
Con Impact Factor ISI
equine bronchi; muscarinic autoreceptors; neuraminidase
Matera, M., Calzetta, L., Sanduzzi, A., Page, C., & Cazzola, M. (2008). Effects of neuraminidase on equine isolated bronchi. PULMONARY PHARMACOLOGY & THERAPEUTICS, 21(4), 624-629 [10.1016/j.pupt.2008.02.003].
Matera, M; Calzetta, L; Sanduzzi, A; Page, C; Cazzola, M
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/42148
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