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Effects of feeding on in vivo motility patterns in the proximal intestine of shorthorn sculpin (Myoxocephalus scorpius)

Artikel i vetenskaplig tidskrift
Författare Jeroen Brijs
G. W. Hennig
Michael Axelsson
Catharina Olsson
Publicerad i Journal of Experimental Biology
Volym 217
Nummer/häfte 17
Sidor 3015-3027
ISSN 0022-0949
Publiceringsår 2014
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 3015-3027
Språk en
Länkar dx.doi.org/10.1242/jeb.101741
Ämnesord Gastrointestinal, Migrating motor complexes, Ripples, Peristalsis, Propagating, Standing contractions, MIGRATING MYOELECTRIC COMPLEX, CANINE SMALL-INTESTINE, SMALL-BOWEL, MOTILITY, DANIO-RERIO EMBRYOS, PIG SMALL-INTESTINE, INTERSTITIAL-CELLS, MOTOR PATTERNS, GASTROINTESTINAL MOTILITY, QUANTITATIVE-ANALYSIS, SPATIOTEMPORAL MAPS, Biology, X JET, 1983, LIFE SCIENCES, V33, P817, EUNG DW, 1980, JOURNAL OF PHYSIOLOGY-LONDON, V309, P13
Ämneskategorier Biologiska vetenskaper

Sammanfattning

This is the first study to catalogue the diverse array of in vivo motility patterns in a teleost fish and how they are affected by feeding. Video recordings of exteriorised proximal intestine from fasted and fed shorthorn sculpin (Myoxocephalus scorpius) were used to generate spatio-temporal maps to portray and quantify motility patterns. Propagating and non-propagating contractions were observed to occur at different frequencies and durations. The most apparent difference between the feeding states was that bands of relatively high amplitude contractions propagating slowly in the anal direction were observed in all fasted fish (N=10) but in only 35% of fed fish (N=11). Additionally, fed fish displayed a reduced frequency (0.21 +/- 0.03 versus 0.32 +/- 0.06 contractions min(-1)) and rhythmicity of these contractions compared with fasted fish. Although the underlying mechanisms of these slow anally propagating contractions differ from those of mammalian migrating motor complexes, we believe that they may play a similar role in shorthorn sculpin during the interdigestive period, to potentially remove food remnants and prevent the establishment of pathogens. 'Ripples' were the most prevalent contraction type in shorthorn sculpin and may be important during mixing and absorption. The persistence of shallow ripples and pendular movements of longitudinal muscle after tetrodotoxin (1 mu mol l(-1)) treatment suggests these contractions were myogenic in origin. The present study highlights both similarities and differences in motility patterns between shorthorn sculpin and other vertebrates, as well as providing a platform to examine other aspects of gastrointestinal functions in fish, including the impact of environmental changes.

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