The gut metabolite composition determined by the microbiota has paramount impact on gastrointestinal physiology. However, the role that bacterial metabolites play in communicating with host cells during inflammatory diseases is poorly understood. Here, we aim to identify the microbiota-determined output of the pro-inflammatory metabolite, succinate, and to elucidate the pathways that control transepithelial succinate absorption and subsequent succinate delivery to macrophages. We show a significant increase of succinate uptake into pro-inflammatory macrophages, which is controlled by Na+-dependent succinate transporters in macrophages and epithelial cells. Furthermore, we find that fecal and serum succinate concentrations were markedly augmented in inflammatory bowel diseases (IBDs) and corresponded to changes in succinate-metabolizing gut bacteria. Together, our results describe a succinate production and transport pathway that controls the absorption of succinate generated by distinct gut bacteria and its delivery into macrophages. In IBD, this mechanism fails to protect against the succinate surge, which may result in chronic inflammation.
|Publication status||Published - 2021 Aug 10|
Bibliographical noteFunding Information:
This work was supported by BSF (grant no. 2015003 to E.O.), ISF (grant no. 271/16 and 2164/16 to E.O.), and Mid-career Researcher Program through NRF grant funded by the Korea government (MSIP) ( NRF-2017R1A2B4001848 to J.H.C.). We thank Dr. Boris M. Baranovski and Ido Brami for their technical assistance with cell cultures and image preparation. We would also like to thank MID (Medical Illustration & Design) for providing support with medical illustrations.
All Science Journal Classification (ASJC) codes
- Biochemistry, Genetics and Molecular Biology(all)