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Oral Citrate Supplementation Mitigates Age‐Associated Pathologic Intervertebral Disc Calcification in LG/J Mice
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Oral Citrate Supplementation Mitigates Age‐Associated Pathologic Intervertebral Disc Calcification in LG/J Mice
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Journal Article
Oral Citrate Supplementation Mitigates Age‐Associated Pathologic Intervertebral Disc Calcification in LG/J Mice
2025
Overview
ABSTRACT
Despite the high prevalence of age‐dependent intervertebral disc calcification, there is a glaring lack of treatment options for this debilitating pathology. We investigated the efficacy of long‐term oral K3Citrate supplementation in ameliorating disc calcification in LG/J mice, a model of spontaneous age‐associated disc calcification. K3Citrate reduced the incidence of disc calcification without affecting the vertebral bone structure, knee calcification, plasma chemistry, or locomotion in LG/J mice. Notably, a positive effect on grip strength was evident in treated mice. FTIR spectroscopy of the persisting calcified nodules indicated K3Citrate did not alter the mineral composition. Mechanistically, activation of an endochondral differentiation in the cartilaginous endplates and nucleus pulposus (NP) compartment contributed to LG/J disc calcification. Importantly, K3Citrate reduced calcification incidence by Ca2+ chelation throughout the disc while exhibiting a differential effect on NP and endplate cell differentiation. In the NP compartment, K3Citrate reduced the NP cell acquisition of a hypertrophic chondrocytic fate, but the pathologic endochondral program was unimpacted in the endplates. Overall, this study for the first time shows the therapeutic potential of oral K3Citrate as a systemic intervention strategy to ameliorate disc calcification.
An endochondral differentiation process in the CEPs drives pathologic disc calcification in aging LG/J mice, and NP cell hypertrophic transdifferentiation secondarily contributes. Supplementing drinking water with 80 mM K3Citrate during aging markedly reduced disc calcification, attenuated NP cell transdifferentiation, and mildly improved NP and AF fibrotic outcomes. CEP endochondral processes persisted, suggesting an extracellular process, such as calcium chelation, prevents disc calcification.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc
Subject
/ Age
/ aging
/ Animals
/ citrate
/ Citric Acid - administration & dosage
/ Citric Acid - therapeutic use
/ Ethylenediaminetetraacetic acid
/ Intervertebral Disc - drug effects
/ Intervertebral Disc - pathology
/ Intervertebral Disc Degeneration - drug therapy
/ Intervertebral Disc Degeneration - pathology
/ LG/J
/ Male
/ Mice
