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The peptide hormone cholecystokinin modulates the tonus and compliance of the bulbus arteriosus and pre-branchial vessels of the rainbow trout (Oncorhynchus mykiss)

Artikel i vetenskaplig tidskrift
Författare Henrik Seth
Michael Axelsson
Albin Gräns
Publicerad i Comparative Biochemistry and Physiology a-Molecular & Integrative Physiology
Volym 178
Sidor 18-23
ISSN 1095-6433
Publiceringsår 2014
Publicerad vid Institutionen för neurovetenskap och fysiologi
Institutionen för biologi och miljövetenskap
Sidor 18-23
Språk en
Länkar dx.doi.org/10.1016/j.cbpa.2014.07.0...
Ämnesord Ventricle, Atrium, Postprandial, Gastrointestinal blood flow, Hyperemia, ELASTIC PROPERTIES, VENTRAL AORTAS, GADUS-MORHUA, BLOOD-FLOW, HEART, FISH, INNERVATION, RECEPTORS, TUNA, COD
Ämneskategorier Zoofysiologi

Sammanfattning

The bulbus arteriosus is a compliant structure between the ventricle and ventral aorta of teleost fish. It serves as a "wind-kessel" that dampens pressure variations during the cardiac cycle allowing a continuous flow of blood into the gills. The bulbus arteriosus receives sympathetic innervation and is affected by several circulating substances, indicating neurohumoral control. We have previously shown that the peptide hormone, cholecystokinin (CCK), affects the hemodynamics of the cardiovascular system in rainbow trout (Oncorhynchus mykiss) by increasing flow pulse amplitude without affecting cardiac output. We hypothesized that this could be explained by an altered tonus or compliance/distensibility of the bulbus arteriosus. Our results show that there is a substantial effect of CCK on the bulbus arteriosus. Concentrations of CCK that altered the cardiac function of in situ perfused hearts also contracted the bulbus arteriosus in vitro. Pressure-volume curves revealed a change in both the tonus and the compliance/distensibility of this structure. Furthermore, the stimulatory (constricting) effect of CCK was also evident in the ventricle and vasculature leading to the gills, but absent in the atrium, efferent branchial arteries and dorsal aorta. In conclusion, CCK alters the mechanical properties of the ventricle, bulbus arteriosus, ventral aorta and afferent gill vasculature, thus maintaining adequate branchial and systemic blood flow and pressure when cardiorespiratory demands change, such as after feeding. (C) 2014 Elsevier Inc All rights reserved.

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