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Pucino V, Nefla M, Gauthier V, Alsaleh G, Clayton SA, Marshall J, Filer A, Clark AR, Raza K, Buckley CD. Differential effect of lactate on synovial fibroblast and macrophage effector functions. Front Immunol 2023; 14:1183825. [PMID: 37304267 PMCID: PMC10251493 DOI: 10.3389/fimmu.2023.1183825] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 05/05/2023] [Indexed: 06/13/2023] Open
Abstract
Introduction The synovial membrane is the main site of inflammation in rheumatoid arthritis (RA). Here several subsets of fibroblasts and macrophages, with distinct effector functions, have been recently identified. The RA synovium is hypoxic and acidic, with increased levels of lactate as a result of inflammation. We investigated how lactate regulates fibroblast and macrophage movement, IL-6 secretion and metabolism via specific lactate transporters. Methods Synovial tissues were taken from patients undergoing joint replacement surgery and fulfilling the 2010 ACR/EULAR RA criteria. Patients with no evidence of degenerative or inflammatory disease were used as control. Expression of the lactate transporters SLC16A1 and SLC16A3 on fibroblasts and macrophages was assessed by immunofluorescence staining and confocal microscopy. To test the effect of lactate in vitro we used RA synovial fibroblasts and monocyte-derived macrophages. Migration was assessed via scratch test assays or using trans-well inserts. Metabolic pathways were analysed by Seahorse analyser. IL-6 secretion was determined by ELISA. Bioinformatic analysis was performed on publicly available single cell and bulk RNA sequencing datasets. Results We show that: i) SLC16A1 and SLC16A3 which regulate lactate intake and export respectively, are both expressed in RA synovial tissue and are upregulated upon inflammation. SLC16A3 is more highly expressed by macrophages, while SLC16A1 was expressed by both cell types. ii) This expression is maintained in distinct synovial compartments at mRNA and protein level. iii) Lactate, at the concentration found in RA joints (10 mM), has opposite effects on the effector functions of these two cell types. In fibroblasts, lactate promotes cell migration, IL-6 production and increases glycolysis. In contrast macrophages respond to increases in lactate by reducing glycolysis, migration, and IL-6 secretion. Discussion In this study, we provide the first evidence of distinct functions of fibroblasts and macrophages in presence of high lactate levels, opening new insights in understanding the pathogenesis of RA and offering novel potential therapeutic targets.
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Affiliation(s)
- Valentina Pucino
- Rheumatology Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, United Kingdom
- Kennedy Institute of Rheumatology, Oxford University, Oxford, United Kingdom
| | - Meriam Nefla
- Rheumatology Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, United Kingdom
| | - Vincent Gauthier
- Rheumatology Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, United Kingdom
- Kennedy Institute of Rheumatology, Oxford University, Oxford, United Kingdom
| | - Ghada Alsaleh
- Kennedy Institute of Rheumatology, Oxford University, Oxford, United Kingdom
| | - Sally A. Clayton
- Rheumatology Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, United Kingdom
| | - Jennifer Marshall
- Rheumatology Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, United Kingdom
| | - Andrew Filer
- Rheumatology Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, United Kingdom
| | - Andy R. Clark
- Rheumatology Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, United Kingdom
| | - Karim Raza
- Rheumatology Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, United Kingdom
- Sandwell and West Birmingham National Health System (NHS) Trust, Birmingham, United Kingdom
| | - Christopher D. Buckley
- Rheumatology Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, United Kingdom
- Kennedy Institute of Rheumatology, Oxford University, Oxford, United Kingdom
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Takahashi K, Kitaoka Y, Matsunaga Y, Hatta H. Effect of post-exercise lactate administration on glycogen repletion and signaling activation in different types of mouse skeletal muscle. Curr Res Physiol 2020; 3:34-43. [PMID: 34746818 PMCID: PMC8562145 DOI: 10.1016/j.crphys.2020.07.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 07/21/2020] [Accepted: 07/23/2020] [Indexed: 01/10/2023] Open
Abstract
Lactate is not merely a metabolic intermediate that serves as an oxidizable and glyconeogenic substrate, but it is also a potential signaling molecule. The objectives of this study were to investigate whether lactate administration enhances post-exercise glycogen repletion in association with cellular signaling activation in different types of skeletal muscle. Eight-week-old male ICR mice performed treadmill running (20 m/min for 60 min) following overnight fasting (16 h). Immediately after the exercise, animals received an intraperitoneal injection of phosphate-buffered saline or sodium lactate (equivalent to 1 g/kg body weight), followed by oral ingestion of water or glucose (2 g/kg body weight). At 60 min of recovery, glucose ingestion enhanced glycogen content in the soleus, plantaris, and gastrocnemius muscles. In addition, lactate injection additively increased glycogen content in the plantaris and gastrocnemius muscles, but not in the soleus muscle. Nevertheless, lactate administration did not significantly alter protein levels related to glucose uptake and oxidation in the plantaris muscle, but enhanced phosphorylation of TBC1D1, a distal protein regulating GLUT4 translocation, was observed in the soleus muscle. Muscle FBP2 protein content was significantly higher in the plantaris and gastrocnemius muscles than in the soleus muscle, whereas MCT1 protein content was significantly higher in the soleus muscle than in the plantaris and gastrocnemius muscles. The current findings suggest that an elevated blood lactate concentration and post-exercise glucose ingestion additively enhance glycogen recovery in glycolytic phenotype muscles. This appears to be associated with glyconeogenic protein content, but not with enhanced glucose uptake, attenuated glucose oxidation, or lactate transport protein.
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Affiliation(s)
- Kenya Takahashi
- Department of Sports Sciences, The University of Tokyo, 3-8-1, Komaba, Meguro-ku, Tokyo, 153-8902, Japan
| | - Yu Kitaoka
- Department of Human Sciences, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama, Kanagawa, 221-8686, Japan
| | - Yutaka Matsunaga
- Department of Sports Sciences, The University of Tokyo, 3-8-1, Komaba, Meguro-ku, Tokyo, 153-8902, Japan
| | - Hideo Hatta
- Department of Sports Sciences, The University of Tokyo, 3-8-1, Komaba, Meguro-ku, Tokyo, 153-8902, Japan
- Corresponding author. Department of Sports Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1, Komaba, Meguro-ku, Tokyo, 153-8902, Japan.
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Hoshino D, Hanawa T, Takahashi Y, Masuda H, Kato M, Hatta H. Chronic post-exercise lactate administration with endurance training increases glycogen concentration and monocarboxylate transporter 1 protein in mouse white muscle. J Nutr Sci Vitaminol (Tokyo) 2016; 60:413-9. [PMID: 25866305 DOI: 10.3177/jnsv.60.413] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Lactate is oxidized as an energy fuel during exercise, and it also plays a key role in the regulation of glycogen synthesis in the muscles and liver after exercise. Previous studies have suggested that lactate is converted to glycogen and stimulates glycogen synthesis. However, it remains unclear whether chronic post-exercise lactate administration can increase glycogen storage in skeletal muscle. We examined whether 3 wk of chronic post-exercise lactate administration with training can increase muscle glycogen storage and whether such changes are associated with monocarboxylate transporter 1 (MCT1) protein expression in mice. Mice were assigned to receive saline with training (SA+T group; n=6) or lactate with training (LA+T group; n=6). All mice performed 40 min of treadmill running at 25 m/min, following which they received saline or lactate (2.5 mg/g body weight), 6 d/wk for 3 wk. After 3 wk, glycogen concentration at rest was higher in the white tibialis anterior (TA; p<0.05, +34%), but not in the red TA, in the LA+T group. Protein expression of MCT1, the primary lactate transporter, was increased with chronic post-exercise lactate administration in the white TA (p<0.05, +32%), but not in the red TA. MCT1 protein expression was significantly correlated with muscle glycogen concentration in the red and white TA in both groups (p<0.05, r=0.969). These results suggest that chronic lactate administration after exercise increases MCT1 protein expression, which can be involved in the regulation of the observed increase in muscle glycogen storage after exercise training.
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Affiliation(s)
- Daisuke Hoshino
- Department of Sports Sciences, Graduate School of Arts and Sciences, The University of Tokyo
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ZHANG G, SHIRAI N, SUZUKI H, SHIMIZU E. Effect of Dietary Lipid Type on the Enhancement of Swimming Endurance of Mice by L-Lactic Acid. FOOD SCIENCE AND TECHNOLOGY RESEARCH 2010. [DOI: 10.3136/fstr.16.447] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Miller BF, Fattor JA, Jacobs KA, Horning MA, Navazio F, Lindinger MI, Brooks GA. Lactate and glucose interactions during rest and exercise in men: effect of exogenous lactate infusion. J Physiol 2002; 544:963-75. [PMID: 12411539 PMCID: PMC2290635 DOI: 10.1113/jphysiol.2002.027128] [Citation(s) in RCA: 147] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
To test the hypothesis that lactate plays a central role in the distribution of carbohydrate (CHO) potential energy for oxidation and glucose production (GP), we performed a lactate clamp (LC) procedure during rest and moderate intensity exercise. Blood [lactate] was clamped at approximately 4 mM by exogenous lactate infusion. Subjects performed 90 min exercise trials at 65 % of the peak rate of oxygen consumption (V(O(2))(,peak); 65 %), 55 % V(O(2))(,peak) (55 %) and 55 % V(O(2))(,peak) with lactate clamped to the blood [lactate] that was measured at 65 % V(O(2))(,peak) (55 %-LC). Lactate and glucose rates of appearance (R(a)), disappearance (R(d)) and oxidation (R(ox)) were measured with a combination of [3-(13)C]lactate, H(13)CO(3)(-), and [6,6-(2)H(2)]glucose tracers. During rest and exercise, lactate R(a) and R(d) were increased at 55 %-LC compared to 55 %. Glucose R(a) and R(d) were decreased during 55 %-LC compared to 55 %. Lactate R(ox) was increased by LC during exercise (55 %: 6.52 +/- 0.65 and 55 %-LC: 10.01 +/- 0.68 mg kg(-1) min(-1)) which was concurrent with a decrease in glucose oxidation (55 %: 7.64 +/- 0.4 and 55 %-LC: 4.35 +/- 0.31 mg kg(-1) min(-1)). With LC, incorporation of (13)C from tracer lactate into blood glucose (L GNG) increased while both GP and calculated hepatic glycogenolysis (GLY) decreased. Therefore, increased blood [lactate] during moderate intensity exercise increased lactate oxidation, spared blood glucose and decreased glucose production. Further, exogenous lactate infusion did not affect rating of perceived exertion (RPE) during exercise. These results demonstrate that lactate is a useful carbohydrate in times of increased energy demand.
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Affiliation(s)
- Benjamin F Miller
- Department of Integrative Biology, University of California, Berkeley 94720, USA
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