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Thrombin generation and activity in multiple sclerosis

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Abstract

The coagulation cascade and immune system are intricately linked, highly regulated and respond cooperatively in response to injury and infection. Increasingly, evidence of hyper-coagulation has been associated with autoimmune disorders, including multiple sclerosis (MS). The pathophysiology of MS includes immune cell activation and recruitment to the central nervous system (CNS) where they degrade myelin sheaths, leaving neuronal axons exposed to damaging inflammatory mediators. Breakdown of the blood-brain barrier (BBB) facilitates the entry of peripheral immune cells. Evidence of thrombin activity has been identified within the CNS of MS patients and studies using animal models of experimental autoimmune encephalomyelitis (EAE), suggest increased thrombin generation and activity may play a role in the pathogenesis of MS as well as inhibit remyelination processes. Thrombin is a serine protease capable of cleaving multiple substrates, including protease activated receptors (PARs), fibrinogen, and protein C. Cleavage of all three of these substrates represent pathways through which thrombin activity may exert immuno-regulatory effects and regulate permeability of the BBB during MS and EAE. In this review, we summarize evidence that thrombin activity directly, through PARs, and indirectly, through fibrin formation and activation of protein C influences neuro-immune responses associated with MS and EAE pathology.

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Data sharing not applicable to this article as no datasets were generated or analyzed during the current study.

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Funding

This work was supported by grants from the National Institutes of Health (R01HL101972, R01HL151367, R21CA223461, R24NS104161, and R44HL117589).

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KRJ, IP, AG, JJS, PP, LSS, OJTM and NV wrote and approved the final version of manuscript.

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Correspondence to Kelley R. Jordan.

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Conflict of interest

N. Verbout and A. Gruber are employees of Aronora, Inc., and they as well as OHSU may have a financial interest in the results of this study. N. Verbout and O. McCarty are inventors on a patent for METHODS AND COMPOSITIONS USED IN TREATING INFLAMMATORY AND AUTOIMMUNE DISEASES (US Patent 10,137,177) which has been licensed by Aronora, Inc. J.J. Shatzel reports receiving consulting fees from Aronora, Inc. The other authors state that they have no conflicts of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Jordan, K.R., Parra-Izquierdo, I., Gruber, A. et al. Thrombin generation and activity in multiple sclerosis. Metab Brain Dis 36, 407–420 (2021). https://doi.org/10.1007/s11011-020-00652-w

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  • DOI: https://doi.org/10.1007/s11011-020-00652-w

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