Abstract
Fermentative organs such as the caecum, the colon, and the rumen have evolved to produce and absorb energy rich short chain fatty acids (SCFA) from otherwise indigestible substrates. Classical models postulate diffusional uptake of the undissociated acid (HSCFA). However, in net terms, a major part of SCFA absorption occurs with uptake of Na+ and resembles classical, coupled electroneutral NaCl transport. Considerable evidence suggests that the anion transporting proteins expressed by epithelia of fermentative organs are poorly selective and that their main function may be to transport acetate−, propionate−, butyrate− and HCO3− as the physiologically relevant anions. Apical uptake of SCFA thus involves non-saturable diffusion of the undissociated acid (HSCFA), SCFA−/HCO3− exchange via DRA (SLC26A3) and/or SCFA−-H+ symport (MCT1, SLC16A1). All mechanisms lead to cytosolic acidification with stimulation of Na+/H+ exchange via NHE (SLC9A2/3). Basolaterally, Na+ leaves via the Na+/K+-ATPase with recirculation of K+. Na+ efflux drives the transport of SCFA− anions through volume-regulated anion channels, such as maxi-anion channels (possibly SLCO2A1), LRRC8, anoctamins, or uncoupled exchangers. When luminal buffering is inadequate, basolateral efflux will increasingly involve SCFA−/ HCO3− exchange (AE1/2, SCL4A1/2), or efflux of SCFA− with H+ (MCT1/4, SLC16A1/3). Furthermore, protons can be basolaterally removed by NHE1 (SCL9A1) or NBCe1 (SLC4A4). The purpose of these transport proteins is to maximize the amount of SCFA transported from the tightly buffered ingesta while minimizing acid transport through the epithelium. As known from the rumen for many decades, a disturbance of these processes is likely to cause severe colonic disease.
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Acknowledgments
My profound thanks to all members of the Institute of Veterinary Physiology for help in many ways and to the many researchers with whom I have discussed SCFA transport over the years. I would also like to thank Yamina Stumpff-Niggemann and Elisabeth Heesom for help with proof-reading and Nils Niggemann for help with the graphics.
Funding
The author wishes to acknowledge the Deutsche Forschungsgemeinschaft (DFG Stu-258/7-1, STU 258/4-1).
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Stumpff, F. A look at the smelly side of physiology: transport of short chain fatty acids. Pflugers Arch - Eur J Physiol 470, 571–598 (2018). https://doi.org/10.1007/s00424-017-2105-9
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DOI: https://doi.org/10.1007/s00424-017-2105-9