SEBatMarseille2008
The Multifunctional Gut
Sponsored by the SEB Osmoregulation Group
Session organised by Dr Nic Bury (King's College London), Dr Richard Handy (Plymouth University), Dr Jean-Herve Lignot (Maître de Conférences à l’Université Louis Pasteur) and Dr Rod Wilson (Exeter University)
Many organisms display the capacity to adjust or transform key anatomical, morphological or physiological characters in response to their environment. Such capacity for change is often referred to as phenotypic plasticity and phenotypic flexibility when such changes are fully reversible. Organisms are therefore able to adjust morphologies and various life history traits to variable environmental challenges. This is particulaly true for the gastrointestinal tract that is a flexible system that can individually be modified to account for changes in amount and quality of food as well as changes in internal demands. This plasticity has been observed in various organs of the digestive tract that is indeed one of the most responsive and sensitive systems to environmental cues. It is a finely-tuned multifunctional system regulating within distinct compartments tissue maintenance and productive functions such as tissue turnover; tissue proliferation; ion transport; nutrient transport; secretions of digestive enzymes, mucus and immunoglobulins; production of immune cells. Animal performance is thus directly linked to gut adjustments.
The scope of this session is to analyse the modalities of gut flexibility in various marine and terrestrial organisms that have to adapt to various nutritional contraints such as food deprivation, infrequent feeding, ontogenetic and seasonal switch in diet composition, assimilation of toxic compounds, parasitism, etc… This will allow a review and analysis of the current evidence and data on gut flexibility. Evolutionary and comparative physiology could also greatly benefit from the study of gut phenotypic flexibility.
Session Programme - Sunday 6th July
08:30 Introduction
Osmoregulation
Chair: Jean Hervé Lignot and Rod Wilson
08:35 Prof. Guy Charmantier (Université Montpellier 2, France)
The role of the gut in hydromineral balance during the ontogeny of the sea bass Dicentrarchus labrax [A1.1]
09:00 Dr Martin Grosell (University of Miami)
Apical proton pump activity and CAIV act to control luminal osmotic pressure and enhance intestinal water absorption by seawater acclimated rainbow trout (RBT) [A1.2]
09:20 Mr Joana Moreira Silva (CIIMAR and ICBAS, UPorto)
Weatherloach (Misgurnus anguillicaudatus) actively excretes ammonia through NHE [A1.3]
09:40 Mr Edward Mager (University of Miami, RSMAS)
Down the path to identifying the transporter(s) responsible for intestinal anion exchange in marine teleost osmoregulation: Exploring the versatile SLC26A6 [A1.4]
10:00 Refreshment Break
Multiple Physiological Functioning
Chair: Nic Bury and Richard Handy
10:30 Dr Rod Wilson (University of Exeter)
Anatomically separated acid-base regulation and respiratory gas exchange in a vertebrate salinity-extremophile [A1.5]
10:55 Ms Josi Taylor (RSMAS, University of Miami)
Basolateral NBC is the hinge of a mechanism serving both osmoregulation and acid-base balance in the marine teleost intestine [A1.6]
11:15 Dr Chris Cooper (University of Exeter)
Breathing in through the gill and out through the gut - unusual gas exchange in fish at hypersalinities [A1.7]
11:35 Dr Gudrun De Boeck (University of Antwerp)
The role of food availability in hypoxia resistance of Amazonian Oscars [A1.8]
12:00 Lunch
Morphology
Chair: Nic Bury and Richard Handy
13:15 Dr Stephen Secor (University of Alabama)
Intestinal form dictates function; the underlying mechanisms regulating intestinal performance [A1.9]
13:40 Dr Rebecca Cramp (The University of Queensland)
Morphological and functional responses of the small intestine during aestivation in the Green-striped Burrowing Frog, Cyclorana alboguttata [A1.10]
14:00 Dr Sylvie Geiger (CNRS - Strasbourg)
Effects of prolonged fasting on intestinal cell proliferation in mallards [A1.11]
14:20 Dr Pierre Laurent ()
Why fish might stay healthy after several months of complete starvation? [A1.12]
14:40 Dr Jean-Hervé Lignot (Louis Pasteur University)
Plasticity of the intestinal wall of various Booidae [A1.13]
15:00 Refreshment Break
Nutrient Uptake and Metals
Chair: Rod Wilson and Jean Hervé Lignot
15:30 Ms SUNITA NADELLA (McMaster University)
An overview of dietary Cu absorption in rainbow trout [A1.14]
15:55 Dr Nic Bury (King's College London)
Metal uptake at the gut of teleost fish: relationship between assimilation efficiency, intestinal accumulation and expression of transport proteins and metallothionein [A1.15]
16:15 Mr Joel Klinck (McMaster University)
Cadmium uptake by across the gut of rainbow trout in vivo and in vitro: the influence of calcium [A1.16]
16:35 Dr Richard Handy (University of Plymouth)
Toxicology of dietary titanium dioxide nanoparticles to Rainbow Trout, (Oncorhynchus mykiss) [A1.17]
Session Programme - Monday 7th July
Chair: Jean Hervé Lignot and Richard Handy
10:30 Dr Chris M. Wood (McMaster University)
In one end of the shark and out the other: events and consequences of feeding in the spiny dogfish, Squalus acanthias [A1.18]
10:55 Prof. William Karasov (Univ.Wisconsin-Madison)
Digestive features of birds confer plastic responses to changing food intake and composition [A1.19]
11:20 Mr Henrik Seth (Göteborg University)
Nutrient induced hyperemia and SDA in Rainbow Trout (Oncorhynchus mykiss) – importance of proteins and lipids [A1.20]
11:40 Mr François Reichardt (Louis Pasteur University)
Effects of a kaolinite complementation on rat intestine during refeeding following prolonged fasting [A1.21]
12:00 Prof. Tobias Wang (Aarhus University)
The cardio-respiratory response to increased metabolic rate during digestion [A1.22]
