Publications

• pH-gated succinate secretion regulates muscle remodeling in response to exercise.

  Reddy A., Bozi L.H.M., Yaghi O.K., Mills E.L., Xiao H., Nicholson H.E., Paschini M., Paulo J.A., Garrity R., Laznik-Bogoslavski D., Ferreira J.C.B., Carl C.S., Sjoeberg K.A., Wojtaszewski J.F.P., Jeppesen J.F., Kiens B., Gygi S.P., Richter E.A., Mathis D., Chouchani E.T.

  In response to skeletal muscle contraction during exercise, paracrine factors coordinate tissue remodeling, which underlies this healthy adaptation. Here we describe a pH-sensing metabolite signal that initiates muscle remodeling upon exercise. In mice and humans, exercising skeletal muscle releas ... >> More

  In response to skeletal muscle contraction during exercise, paracrine factors coordinate tissue remodeling, which underlies this healthy adaptation. Here we describe a pH-sensing metabolite signal that initiates muscle remodeling upon exercise. In mice and humans, exercising skeletal muscle releases the mitochondrial metabolite succinate into the local interstitium and circulation. Selective secretion of succinate is facilitated by its transient protonation, which occurs upon muscle cell acidification. In the protonated monocarboxylic form, succinate is rendered a transport substrate for monocarboxylate transporter 1, which facilitates pH-gated release. Upon secretion, succinate signals via its cognate receptor SUCNR1 in non-myofibrillar cells in muscle tissue to control muscle-remodeling transcriptional programs. This succinate-SUCNR1 signaling is required for paracrine regulation of muscle innervation, muscle matrix remodeling, and muscle strength in response to exercise training. In sum, we define a bioenergetic sensor in muscle that utilizes intracellular pH and succinate to coordinate tissue adaptation to exercise. << Less

  Cell 183:62-75(2020) [PubMed] [EuropePMC]

• The Escherichia coli SLC26 homologue YchM (DauA) is a C(4)-dicarboxylic acid transporter.

  Karinou E., Compton E.L., Morel M., Javelle A.

  The SLC26/SulP (solute carrier/sulphate transporter) proteins are a ubiquitous superfamily of secondary anion transporters. Prior studies have focused almost exclusively on eukaryotic members and bacterial members are frequently classified as sulphate transporters based on their homology with SulP ... >> More

  The SLC26/SulP (solute carrier/sulphate transporter) proteins are a ubiquitous superfamily of secondary anion transporters. Prior studies have focused almost exclusively on eukaryotic members and bacterial members are frequently classified as sulphate transporters based on their homology with SulP proteins from plants and fungi. In this study we have examined the function and physiological role of the Escherichia coli Slc26 homologue, YchM. We show that there is a clear YchM-dependent growth defect when succinate is used as the sole carbon source. Using an in vivo succinate transport assay, we show that YchM is the sole aerobic succinate transporter active at acidic pH. We demonstrate that YchM can also transport other C(4) -dicarboxylic acids and that its substrate specificity differs from the well-characterized succinate transporter, DctA. Accordingly ychM was re-designated dauA (dicarboxylic acid uptake system A). Finally, our data suggest that DauA is a protein with transport and regulation activities. This is the first report that a SLC26/SulP protein acts as a C(4) -dicarboxylic acid transporter and an unexpected new function for a prokaryotic member of this transporter family. << Less

  Mol. Microbiol. 87:623-640(2013) [PubMed] [EuropePMC]

  This publication is cited by 2 other entries.