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1
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Respiratory effects of serotonin challenge to pulmonary and laryngeal circulation in anaesthetized cats

100%
Szereda-Przestaszewska M., Wypych B.
Acta Neurobiologiae Experimentalis
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1996
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vol. 56
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issue 4
889-896
EN
Administration of serotonin (5-HT) to pulmonary circulation elicits prompt apnoea, followed by subsequent tachypnoea. The present study was designed to ascertain whether 5-HT challenge into the laryngeal artery will evoke the full constellation of this chemoreflex and to examine the role of laryngeal sensory input and importance of vagal afferents in the respiratory sequelae.The experiments were done on 10 anaesthetized, spontaneously breathing cats.Laryngeal artery injections of 5-HT, similarly to intravenous challenge, caused apnoeas, which were significantly diminished by the section of cervical vagal trunks. Breathing frequency increased in all condtions on intravenous injection but only prior to vagotomy, when administered into laryngeal artery. With resumed breathing,the peak inspiratory airflows were significantly increased in the neurally intact, those treated by bilateral section of the superior laryngeal nerves (SLNs-cut) and vagotomized cats, with no difference between them and independent of the route of injection. The results show that serotonin chemoreflex could evolve from the laryngeal vascular bed and that laryngeal afferents do not contribute to the respiratory arrest.
2
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Respiratory effects of capsaicin occur beyond the lung vagi in anaesthetized rats

88%
Kaczynska K., Szereda-Przestaszewska M.
Acta Neurobiologiae Experimentalis
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2000
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vol. 60
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issue 2
159-165
EN
The effects of an intravenous capsaicin challenge on the respiratory pattern and ventilation were studied in 15 urethane/chloralose-anaesthetized, spontanously breathing rats. Bolus injection of capsaicin at a dose of 5 mug/kg into the right femoral vein evoked respiratory arrest in all animals (both prior to and after bilateral midcervical vagotomy), which effect was abolished by ruthenium red pretreatment. Breathing that followed the apnoea was of enlarged tidal volume and initially increased respiratory rate, which resulted in an augmented ventilation. The capsaicin-induced respiratory changes were independent of vagal integrity and may depend on stimulation of vanilloid receptors within the nodose ganglia.
3
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Horseradish peroxidase localization of the mylohyoid motoneurones in the rabbit

75%
Gromysz H., Karczewski W., Kosmal A., Kukwa A.
Acta Neurobiologiae Experimentalis
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1993
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vol. 53
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issue 1
421-424
EN
Experiments were performed with anaesthetized (urethan and chloralose) spontaneously breathing rabbits. Horseradish peroxidase (HRP) was injected (1 mg) with a Hamilton syringe into the end of the sectioned mylohyoid nerve. The HRP-labelled neurones could be localized in the motor nucleus of the trigeminal nerve (N.V.mt.). It was found that the labelled neurones are present in the caudal and intermediate part of the nucleus. However, their largest agglomerations were noted in the , where they occupied the entire frontal section of the nucleus. It is assumed that the N.V.mt. directing their axons to the muscles of the upper
4
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Action of serotonin on the laryngeal airway in anaesthetized cats

75%
Szereda-Przestaszewska M., Kopczynska B.
Acta Neurobiologiae Experimentalis
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1997
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vol. 57
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issue 3
209-216
EN
The pulmonary chemoreflex induced by an intravenous injection of serotonin (5-hydroxytryptamine) in cats consists of prompt apnoea, bradycardia and hypotension, followed by rapid, shallow breathing. The present study had two purposes (1) to compare the effect of 5HT on ventilation and laryngeal resistance in cats and (2) to assess the role of laryngeal afferents in these responses. The effects of an intravenous injection of serotonin at a dose of 0.05 mg per kg of body weight were studied in eighteen anaesthetized cats, breathing spontaneously via a tracheal cannula. In eleven cats the larynx was isolated in situ to measure laryngeal resistance. In post-serotonin apnoea, the expiratory laryngeal resistance rose four-fold. This coincided with the increased afferent activity of the superior laryngeal nerve. In the initial phase of resumed shallow breathing, the increase in the expiratory laryngeal resistance was coupled with reduced tidal volume. Bilateral section of the superior laryngeal nerve failed to affect laryngeal constriction and the ventilatory response to serotonin. Thus laryngeal afferents running within the superior laryngeal nerve are not essential for the respiratory phenomena induced by serotonin.
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