N. Eigendorf

University of Veterinary Medicine Hannover, Foundation

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Mirja R. Wilkens

University of Veterinary Medicine Hannover, Foundation

Bernd Schröder

Umeå University

Alexandra S. Muscher‐Banse

University of Veterinary Medicine Hannover, Foundation

L. Marholt

University of Veterinary Medicine Hannover, Foundation

G. Breves

University of Veterinary Medicine Hannover, Foundation

A. Cehak

University of Veterinary Medicine Hannover, Foundation

Karsten Feige

University of Veterinary Medicine Hannover, Foundation

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University of Veterinary Medicine Hannover, Foundation

University of Veterinary Medicine Vienna

University of Veterinary Medicine

Martin Luther University Halle-Wittenberg

Klinik und Poliklinik für Psychosomatik und Psychotherapie

University Hospital Münster

Freie Universität Berlin

Ontario Veterinary College

University of Guelph

Médecins Sans Frontières

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Segmental diversity of phosphate transport along the intestinal axis in horses1

Journal of Animal Science (2017)

Alexandra S. Muscher‐Banse L. Marholt N. Eigendorf Mirja R. Wilkens Bernd Schröder

For horses, distinct differences in intestinal phosphate transport have been postulated to account for the unique features of hind gut fermentation compared to other monogastric animals and ruminants. So far published data on mechanisms and underlying transport proteins involved in intestinal phosphate transport in the horse are still missing. Therefore we investigated intestinal phosphate transport in horses at both functional and molecular levels. Segmental diversity of intestinal phosphate transport along the intestinal axis was documented using the Ussing chamber technique. A transcellular phosphate secretion in the jejunum was confirmed. Furthermore, 2 sodium-dependent phosphate cotransporters, NaPiIIb and PiT1, were first detected in the equine intestine at mRNA level with PiT1 being expressed in both the small and large intestine, and NaPiIIb being solely expressed in the large intestine. In the colon, unidirectional net flux rates of phosphate were significantly greater compared to flux rates in other segments ( < 0.005) suggesting the colon as a major site for phosphate absorption in horses. Phosphate transport in the colon was mainly transcellular and mediated by a sodium-gradient as documented by Ussing chamber experiments and uptake of phosphate into colonic brush border membrane vesicles. In summary, the present study demonstrated mechanisms and transporters of intestinal phosphate transport in equine intestinal tissues with distinct differences between intestinal segments providing a new basis for a better understanding of intestinal phosphate transport in horses.

Transcellular

Ussing chamber

Paracellular transport

Brush border

Jejunum

10.2527/jas.2016.0939

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Citations (3)

Trans- and paracellular calcium transport along the small and large intestine in horses

Comparative Biochemistry and Physiology Part A Molecular & Integrative Physiology (2016)

Mirja R. Wilkens L. Marholt N. Eigendorf Alexandra S. Muscher‐Banse Karsten Feige

Paracellular transport