Lactate efflux from intervertebral disc cells is required for maintenance of spine health.

SILAGI, Elizabeth S, NOVAIS, Emanuel J, BISETTO, Sara, TELONIS, Aristeidis G, SNUGGS, Joseph, LE MAITRE, Christine L, QIU, Yunping, KURLAND, Irwin J, SHAPIRO, Irving M, PHILP, Nancy J and RISBUD, Makarand V (2019). Lactate efflux from intervertebral disc cells is required for maintenance of spine health. Journal of Bone and Mineral Research (JBMR).

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Maintenance of glycolytic metabolism is postulated to be required for health of the spinal column. In the hypoxic tissues of the intervertebral disc and glycolytic cells of vertebral bone, glucose is metabolized into pyruvate for ATP generation and reduced to lactate to sustain redox balance. The rise in intracellular H+ /lactate concentrations are balanced by plasma-membrane monocarboxylate transporters (MCTs). Using MCT4 null mice and human tissue samples, complimented with genetic and metabolic approaches, we determine that H+ /lactate efflux is critical for maintenance of disc and vertebral bone health. Mechanistically, MCT4 maintains glycolytic and TCA cycle flux and intracellular pH homeostasis in the nucleus pulposus compartment of the disc, where HIF-1α directly activates an intronic enhancer in SLC16A3. Ultimately, our results provide support for research into lactate as a diagnostic biomarker for chronic, painful disc degeneration.

Item Type: Article
Uncontrolled Keywords: Bone QCT/uCT; Genetic Animals Models; Nutrition; Transcription Factors; 11 Medical and Health Sciences; 06 Biological Sciences; 09 Engineering; Anatomy & Morphology
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SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 09 Dec 2019 11:54
Last Modified: 17 Mar 2021 21:00

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