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        2-oxothiazolidine-4-carboxylic acid inhibits vascular calcification via induction of glutathione synthesis

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        jcp.30036.pdf (PDF, 1Mb)
        Author
        Patel, Jessal
        Bourne, Lucie E
        Thakur, Shori
        Farrington, Kenneth
        Gorog, Diana
        Orriss, Isabel R
        Baydoun, Anwar
        Attention
        2299/23127
        Abstract
        Arterial medial calcification (AMC), the deposition of hydroxyapatite in the medial layer of the arteries, is a known risk factor for cardiovascular events. Oxidative stress is a known inducer of AMC and endogenous antioxidants, such as glutathione (GSH), may prevent calcification. GSH synthesis, however, can be limited by cysteine levels. Therefore, we assessed the effects of the cysteine prodrug 2‐oxothiazolidine‐4‐carboxylic acid (OTC), on vascular smooth muscle cell (VSMC) calcification to ascertain its therapeutic potential. Human aortic VSMCs were cultured in basal or mineralising medium (1 mM calcium chloride/sodium phosphate) and treated with OTC (1–5 mM) for 7 days. Cell‐based assays and western blot analysis were performed to assess cell differentiation and function. OTC inhibited calcification ≤90%, which was associated with increased ectonucleotide pyrophosphatase/phosphodiesterase activity, and reduced apoptosis. In calcifying cells, OTC downregulated protein expression of osteoblast markers (Runt‐related transcription factor 2 and osteopontin), while maintaining expression of VSMC markers (smooth muscle protein 22α and α‐smooth muscle actin). GSH levels were significantly reduced by 90% in VSMCs cultured in calcifying conditions, which was associated with declines in expression of gamma‐glutamylcysteine synthetase and GSH synthetase. Treatment of calcifying cells with OTC blocked the reduction in expression of both enzymes and prevented the decline in GSH. This study shows OTC to be a potent and effective inhibitor of in vitro VSMC calcification. It appears to maintain GSH synthesis which may, in turn, prevent apoptosis and VSMCs gaining osteoblast‐like characteristics. These findings may be of clinical relevance and raise the possibility that treatment with OTC could benefit patients susceptible to AMC.
        Publication date
        2020-09-12
        Published in
        Journal of Cellular Physiology
        Published version
        https://doi.org/10.1002/jcp.30036
        Other links
        http://hdl.handle.net/2299/23127
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