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. 1991 Jan;102(1):267–271. doi: 10.1111/j.1476-5381.1991.tb12164.x

Parainfluenza virus infection damages inhibitory M2 muscarinic receptors on pulmonary parasympathetic nerves in the guinea-pig.

A D Fryer 1, D B Jacoby 1
PMCID: PMC1917879  PMID: 1646059

Abstract

1. The effect of viral infection on the function of neuronal M2 muscarinic autoreceptors in the lungs was studied in anaesthetized guinea-pigs. 2. Guinea-pigs were inoculated intranasally with either parainfluenza type 3 or with a vehicle control. Four days later the animals were anaesthetized, paralysed and artificially ventilated. Pulmonary inflation pressure, tidal volume, blood pressure, and heart rate were recorded. Both vagus nerves were cut and electrical stimulation of the distal portions caused bronchoconstriction (measured as an increase in pulmonary inflation pressure) and bradycardia. 3. In control animals, pilocarpine (1-100 micrograms kg-1, i.v.) attenuated vagally-induced bronchoconstriction by stimulating inhibitory M2 muscarinic receptors on parasympathetic nerves in the lungs. Conversely, blockade of these receptors with the antagonist gallamine (0.1-10 mg kg-1, i.v.) produced a marked potentiation of vagally-induced bronchoconstriction. These results confirm previous findings. 4. In guinea-pigs infected with parainfluenza virus, pilocarpine did not inhibit vagally-induced bronchoconstriction. Furthermore, gallamine did not potentiate vagally-induced bronchoconstriction to the same degree as in uninfected controls. 5. There was no increase in baseline pulmonary inflation pressure in the infected animals over the controls. Receptors on airway smooth muscle were unchanged by viral infection since large doses of pilocarpine caused equivalent bronchoconstriction in both groups of animals. Gallamine inhibited the vagally-induced fall in heart rate equally in both groups of animals indicating that virus-induced changes in M2 receptor function on pulmonary parasympathetic nerves are not part of a generalized decrease in M2 receptor function.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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