Serotonin (5-HT) has been described for several years and is widely present in several classes of animals. In mammals, the active expiration has been focus of intense research in respiratory control field. It has been demonstrated that the recruitment of expiratory activity (expiratory muscles, ex: abdominal) originates from an expiratory oscillator (RTN / pFRG), distinct from the inspiratory one (pre-Bötzinger), being recruited in high respiratory demand conditions, such as during hypercapnia. Despite advances in knowledge about breathing control, there are few studies on the motor and respiratory control related to the activity of the abdominal muscles (expiration). There are no studies in the literature addressing neural mechanisms involved in this activity, especially 5-HT neurons of the bulbar raphe, which are strongly involved in the respiratory control network, especially in respiratory adjustment during hypercapnia. Therefore, the objective of the present project is to assess the effect of chemical inhibition (muscimol) of the medullary raphe during hypercapnia, as well as the inhibition of 5-HT neurons (8-OH-DPAT) in the medullary raphe during active expiration in hypercapnic conditions during wakefulness and sleep.
News published in Agência FAPESP Newsletter about the scholarship: