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|Keynote: J Immunome Res|
|Lupus erythematosus is a multigenic inflammatory autoimmune disease that is usually treated with corticoids, anti-TNFα compounds, and anti- CD20, by acting non-selectively, inducing unwanted effects. Cyclic nucleotide phosphodiesterases (PDEs) play a major role in intracellular signaling by hydrolyzing the second messenger cyclic AMP and/or cyclic GMP, according to their subtypes. Since PDE is able to modulate inflammatory processes such as TNFα and other cytokines, one could wonder whether a PDE inhibitor might be beneficial in lupus treatment. Therefore, the evolution of PDE activity and expression levels during the course of the disease in MRL/lpr lupus-prone mice, as well as the biological and the clinical effects of treatments with three different PDE inhibitors: pentoxifylline (100μg), denbufylline (100μg) and NCS 613 (30μg) was evaluated in these mice. The comparison of kidney PDE4 activity progression of MRL/lpr mice with CBA/J control mice reveals an increase of activity with the disease progression, whereas PDE2 and PDE3 activities are not significantly changed. When treated with PDE inhibitors, the most potent and selective PDE4 inhibitor NCS 613 (IC50=42 nM) was also found to be the most effective molecule in decreasing proteinuria and increasing survival rate of MRL/lpr mice. NCS 613 is a potent inhibitor which is more selective for PDE4C subtype (IC50: 1.4 nM) and has an affinity for the high affinity rolipram binding site (HARBS) and relatively low (Ki=148 nM) in comparison to rolipram (Ki=3 nM) suggesting few emetic effect. Interestingly, NCS 613 inhibits basal and LPS-induced TNFa secretion from PBLs of lupus patients, as well as from MRL/lpr peripheral blood lymphocytes (PBLs), pointing out the therapeutic potential of NCS 613 in systemic lupus. This study reveals that PDE4 represent a potential therapeutic target in lupus disease and that the original compound NCS 613 delay lupus disease progression.|
Claire Lugnier has experience in studying the role of cyclic nucleotide phosphodiesterases (PDE) in normal and pathophysiological signaling and conceiving specific and selective PDE inhibitors. She has based her knowledge mainly on PDE1-PDE5 after years of experience in research and teaching.
Email: [email protected]
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