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General Review Article

The Effects of PDE Inhibitors on Multiple Sclerosis: a Review of in vitro and in vivo Models

Author(s): Alexandra Ainatzoglou, Eleni Stamoula, Ioannis Dardalas, Spyridon Siafis and Georgios Papazisis*

Volume 27, Issue 20, 2021

Published on: 03 March, 2021

Page: [2387 - 2397] Pages: 11

DOI: 10.2174/1381612827666210303142356

Price: $65

Abstract

Background: Multiple sclerosis (MS) is a chronic inflammatory and immune-mediated disease, whose current therapeutic means are mostly effective in the relapsing-remitting form of MS, where inflammation is still prominent, but fall short of preventing long term impairment. However, apart from inflammationmediated demyelination, autoimmune mechanisms play a major role in MS pathophysiology, constituting a promising pharmacological target. Phosphodiesterase (PDE) inhibitors have been approved for clinical use in psoriasis and have undergone trials suggesting their neuroprotective effects, rendering them eligible as an option for accessory MS therapy.

Objective: In this review, we discuss the potential role of PDE inhibitors as a complementary MS therapy.

Methods: We conducted a literature search through which we screened and comparatively assessed papers on the effects of PDE inhibitor use, both in vitro and in animal models of MS, taking into account a number of inclusion and exclusion criteria.

Results: In vitro studies indicated that PDE inhibitors promote remyelination and axonal sustenance, while curbing inflammatory cell infiltration, hindering oligodendrocyte and neuronal loss and suppressing cytokine production. In vivo studies underlined that these agents alleviate symptoms and reduce disease scores in MS animal models.

Conclusion: PDE inhibitors proved to be effective in addressing various aspects of MS pathogenesis both in vitro and in vivo models. Given the latest clinical trials proving that the PDE4 inhibitor Ibudilast exerts neuroprotective effects in patients with progressive MS, research on this field should be intensified and selective PDE4 inhibitors with enhanced safety features should be seriously considered as prospective complementary MS therapy.

Keywords: MS, PDE inhibitors, Rolipram, EAE, in vivo, in vitro, immunomodulation.

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