Evolutionary aspects of intestinal bicarbonate secretion in fish

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
Josi R Taylor, Martin Grosell

Abstract

Experiments compared intestinal HCO3- secretion in the intestine of marine teleost Gulf toadfish, Opsanus beta, to representatives of early chondrostean and chondrichthyan fishes, the Siberian sturgeon, Acipenser baerii, and white-spotted bamboo shark, Chiloscyllium plagiosum, respectively. As seen in marine teleosts, luminal HCO3- concentrations were 10-fold plasma levels in all species when exposed to hyperosmotic conditions. While intestinal water absorption left Mg2+ and SO4(2-) concentrated in intestinal fluids up to four-fold ambient seawater concentrations, HCO3- was concentrated up to 50 times ambient levels as a result of intestinal HCO3- secretion. Reduced luminal Cl- concentrations in the intestine of all species suggest that HCO3- secretion also occurs via Cl-/HCO3- exchange in chondrostean and chondrichthyan fishes. Sturgeon began precipitating carbonates from the gut after only 3 days at 14 per thousand, a mechanism utilized by marine teleosts to reduce intestinal fluid osmolality and maintain calcium homeostasis. Analysis of published intestinal fluid composition in the cyclostome Lampetra fluviatilis reveals that this species likely also utilize intestinal HCO3- secretion for osmoregulation. Analysis of existing...Continue Reading

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Citations

Jun 12, 2009·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Peter J AllenDietmar Kültz
Jul 1, 2009·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Ray C BartoloA Grant Butt
Jul 8, 2011·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Jonathan M Whittamore
Feb 5, 2010·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Christopher A CooperRod W Wilson
Dec 3, 2013·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Alexander M CliffordGreg G Goss
May 22, 2007·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Martin TresguerresGreg G Goss
Dec 5, 2006·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Martin Grosell, Josi R Taylor
Oct 6, 2006·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·W Gary AndersonMartin Grosell
Mar 29, 2007·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Josi R TaylorMartin Grosell
May 20, 2006·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·M Grosell, J Genz
Jan 25, 2008·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Yukihiro KuritaShigehisa Hirose
Dec 26, 2008·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Soichi WatanabeToyoji Kaneko
Oct 25, 2011·Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology·Meredith V EverettDouglas L Crawford
Oct 23, 2009·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Martin Grosell
Apr 13, 2017·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Peter J AllenSteve E Lochmann
Feb 17, 2009·The Journal of Experimental Biology·Chris M WoodPatrick J Walsh
Jul 22, 2006·The Journal of Experimental Biology·Martin Grosell
Jul 22, 2006·The Journal of Experimental Biology·Josi R Taylor, Martin Grosell
Oct 8, 2021·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Daniel MorgenrothErik Sandblom

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