Abstract
Lactate has received attention as a potential therapeutic intervention for brain diseases, particularly those including energy deficit, exacerbated inflammation, and disrupted redox status, such as cerebral ischemia. However, lactate roles in metabolic or signaling pathways in neural cells remain elusive in the hypoxic and ischemic contexts. Here, we tested the effects of lactate on the survival of a microglial (BV-2) and a neuronal (SH-SY5Y) cell lines during oxygen and glucose deprivation (OGD) or OGD followed by reoxygenation (OGD/R). Lactate signaling was studied by using 3,5-DHBA, an exogenous agonist of lactate receptor GPR81. Inhibition of lactate dehydrogenase (LDH) or monocarboxylate transporters (MCT), using oxamate or 4-CIN, respectively, was performed to evaluate the impact of lactate metabolization and transport on cell viability. The OGD lasted 6 h and the reoxygenation lasted 24 h following OGD (OGD/R). Cell viability, extracellular lactate concentrations, microglial intracellular pH and TNF-ɑ release, and neurite elongation were evaluated. Lactate or 3,5-DHBA treatment during OGD increased microglial survival during reoxygenation. Inhibition of lactate metabolism and transport impaired microglial and neuronal viability. OGD led to intracellular acidification in BV-2 cells, and reoxygenation increased the release of TNF-ɑ, which was reverted by lactate and 3,5-DHBA treatment. Our results suggest that lactate plays a dual role in OGD, acting as a metabolic and a signaling molecule in BV-2 and SH-SY5Y cells. Lactate metabolism and transport are vital for cell survival during OGD. Moreover, lactate treatment and GPR81 activation during OGD promote long-term adaptations that potentially protect cells against secondary cell death during reoxygenation.
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Data are available upon reasonable request.
Abbreviations
- 3,5-DHBA:
-
3,5-Dihydroxybenzoic acid
- 4-CIN:
-
ɑ-Cyano-4-hydroxycinnamic acid
- ANLS:
-
Astrocyte-neuron lactate shuttle
- ATP:
-
Adenosine triphosphate
- BCECF-AM:
-
Acetoxymethyl ester of 2′,7′-bis-(2-carboxyethyl)-5-(and-6)-carboxyfluorescein
- cAMP:
-
Cyclic adenosine monophosphate
- CD206:
-
Cluster of differentiation 206, mannose receptor
- CNS:
-
Central nervous system
- DAPI:
-
4′,6-Diamidino-2-phenylindole
- DMEM:
-
Dulbecco’s Modified Eagle Medium
- ELISA:
-
Enzyme-linked immunosorbent assay
- FBS:
-
Fetal bovine serum
- GPR81:
-
G protein-coupled-receptor 81
- HCAR1:
-
Hydroxy-carboxylic acid receptor 1
- HCl:
-
Hydrochloric acid
- HEPES:
-
4-(2-Hydroxyethyl)-1-piperazineethanesulfonic acid
- HIF-1α:
-
Hypoxia inducible factor-1, subunit alpha
- OGD:
-
Oxygen and glucose deprivation
- OGD/R:
-
Oxygen and glucose deprivation-reoxygenation
- MCT:
-
Monocarboxylate transporter
- MTT:
-
3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- NAD+ :
-
Nicotinamide adenine dinucleotide, oxidized form
- NADH:
-
Nicotinamide adenine dinucleotide, reduced form
- NEFL:
-
Neurofilament light polypeptide
- NF-κB:
-
Nuclear factor kappa B
- NLRP3:
-
Nod-like receptor protein 3
- pHi:
-
Intracellular potential of hydrogen
- P/S:
-
Penicillin/streptomycin
- PBS:
-
Phosphate-buffer saline
- PKA:
-
Protein kinase A
- RA:
-
Retinoic acid
- RT:
-
Room temperature
- TNF-α:
-
Tumor necrosis factor-alpha
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Acknowledgements
We want to express our gratitude to Dr. Amanda Thomaz from the Division of Biomedical and Life Sciences, Lancaster University, and also to the PhD student, Janaína Zang from the Federal University of Rio Grande do Sul (UFRGS) for their unwavering support in the immunofluorescence experiments.
Funding
This study was supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), National Institute of Science and Technology on Neuroimmunomodulation (INCT-NIM), FIOCRUZ Institutional Internationalization Program (CAPES/PrInt-Fiocruz), UFRGS Institutional Internationalization Program (CAPES/PrInt-UFRGS), and Erasmus+ Funding Programme.
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Conceived and designed the experiments: IDT, DAMC, RPG, AHP, VBJ, and LSF. Performed the experiments: IDT, and FSR. Analyzed the data: IDT, FSR, VBJ, and LSF. Data interpretation: IDT, DAMC, RPG, AHP, and LSF. Wrote the first draft of the manuscript: IDT, and LSF. Revised critically the manuscript: CB, DAMC, RPG, and AHP. Grammar review: CB. All authors reviewed the final version of the manuscript.
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Tassinari, I.D., Rodrigues, F.d., Bertram, C. et al. Lactate Protects Microglia and Neurons from Oxygen–Glucose Deprivation/Reoxygenation. Neurochem Res (2024). https://doi.org/10.1007/s11064-024-04135-7
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DOI: https://doi.org/10.1007/s11064-024-04135-7