Animal Bioscience

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Carbonic anhydrase influences asymmetric sodium and acetate transport across omasum of sheep

  • Rabbani, Imtiaz (Department of Physiology, University of Veterinary and Animal Sciences) ;
  • Rehman, Habib (Department of Physiology, University of Veterinary and Animal Sciences) ;
  • Martens, Holger (Institute of Veterinary Physiology, Free University of Berlin) ;
  • Majeed, Khalid Abdul (Department of Physiology, University of Veterinary and Animal Sciences) ;
  • Yousaf, Muhammad Shahbaz (Department of Physiology, University of Veterinary and Animal Sciences) ;
  • Rehman, Zia Ur (Department of Physiology, University College of Veterinary and Animal Sciences, The Islamia University of Bahawalpur)
  • Received : 2020.03.16
  • Accepted : 2020.06.05
  • Published : 2021.05.01
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Abstract

Objective: Omasum is an important site for the absorption of short chain fatty acids. The major route for the transport of acetate is via sodium hydrogen exchanger (NHE). However, a discrepancy in the symmetry of sodium and acetate transport has been previously reported, the mechanism of which is unclear. In this study, we investigated the possible role of carbonic anhydrase (CA) for this asymmetry. Methods: Omasal tissues were isolated from healthy sheep (N = 3) and divided into four groups; pH 7.4 and 6.4 alone and in combination with Ethoxzolamide. Electrophysiological measurements were made using Ussing chamber and the electrical measurements were made using computer controlled voltage clamp apparatus. Effect(s) of CA inhibitor on acetate and sodium transport flux rate of Na22 and 14C-acetate was measured in three different flux time periods. Data were presented as mean±standard deviation and level of significance was ascertained at p≤0.05. Results: Mucosal to serosal flux of Na (JmsNa) was greater than mucosal to serosal flux of acetate (JmsAc) when the pH was decreased from 7.4 to 6.4. However, the addition of CA inhibitor almost completely abolished this discrepancy (JmsNa ≈ JmsAc). Conclusion: The results of the present study suggest that the additional protons required to drive the NHE were provided by the CA enzyme in the isolated omasal epithelium. The findings of this study also suggest that the functions of CA may be exploited for better absorption in omasum.

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References

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