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Quantification of Mg2+, Ca2+ and H+ Transport by the Gastrointestinal Tract of the Goldfish, Carassius Auratus, Using the Scanning Ion-selective Electrode Technique (SIET)

Quantification of Mg2+, Ca2+ and H+ Transport by the Gastrointestinal Tract of the Goldfish, Carassius Auratus, Using the Scanning Ion-selective Electrode Technique (SIET)

Vladimir Kodzhahinchev, Andrew Biancolin, Carol Bucking

PLoS One. 2018 Dec 4;13(12):e0207782.

PMID: 30513099

Abstract:

An in vitro gut-sac technique and the scanning ion-selective electrode technique (SIET) were used to characterize Mg2+, Ca2+, and H+ transport at both the mucosal and serosal surfaces of non-everted and everted gastrointestinal tissues obtained from Carassius auratus. As part of the study, two magnesium ionophores were compared (II vs. VI). Unfed animals displayed uniform transport of all ions along the intestine. Feeding resulted in elevated Mg2+ and Ca2+ transport when the gut lumen contained chyme however, under symmetrical conditions this increased transport rate was absent. Furthermore, zonation of divalent cation transport was present for both Ca2+ and Mg2+ under non-symmetrical conditions while the zonation remained for Ca2+ alone under symmetrical conditions. High dietary Mg2+ decreased absorption and induced secretion of Mg2+ in the posterior intestine. Uptake kinetics in the esophagus suggest large diffusive and/or convective components based on a linear relationship between Mg2+ transport and concentration and lack of inhibition by ouabain, an inhibitor of Na+-K+-ATPase. In contrast, kinetics in the rectum were suggestive of a low affinity, saturable carrier-mediated pathway. A decrease in Mg2+ and Ca2+ transport was observed in the posterior intestine (both at the mucosal and serosal surfaces) in response to ouabain. This impact was greatest for Ca2+ transport and when applied to the mucosal fluid and measured in everted preparations. In contrast a putative Mg2+ transport inhibitor, cobalt(III)hexamine-chloride, did not affect Mg2+ transport. This is the first study to use SIET approaches to study ion transport in the gut of teleost fish. This is also the first study to provide characterization of Mg2+ transport in the gut of C. auratus. Due to the limited selectivity of Magnesium ionophore II, subsequent studies of tissues bathed in physiological saline should be made using Magnesium Ionophore VI.

Chemicals Related in the Paper:

Catalog Number	Product Name	CAS Number	Price
AP119110371	Magnesium ionophore II	119110-37-1	Price
AP151058387	Magnesium ionophore VI	151058-38-7	Price
AP178959289	Chloride ionophore III	178959-28-9	Price
AP4088226-A	Hydrogen ionophore III	4088-22-6	Price
AP70268369	Hydrogen ionophore II	70268-36-9	Price
AP74267279	Calcium ionophore II	74267-27-9	Price

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