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Calming Down Mast Cells with Ketotifen: A Potential Strategy for Multiple Sclerosis Therapy?

  • Karen Henriette PinkeEmail author
  • Sofia Fernanda Gonçalves Zorzella-Pezavento
  • Thais Fernanda de Campos Fraga-Silva
  • Luiza Ayumi Nishiyama Mimura
  • Larissa Ragozo Cardoso de Oliveira
  • Larissa Lumi Watanabe Ishikawa
  • Ana Angélica Henrique Fernandes
  • Vanessa Soares Lara
  • Alexandrina Sartori
Original Article

Abstract

Multiple sclerosis (MS) is a chronic autoimmune disease of the central nervous system (CNS) characterized by extensive inflammation, demyelination, axonal loss and gliosis. Evidence indicates that mast cells contribute to immunopathogenesis of both MS and experimental autoimmune encephalomyelitis (EAE), which is the most employed animal model to study this disease. Considering the inflammatory potential of mast cells, their presence at the CNS and their stabilization by certain drugs, we investigated the effect of ketotifen fumarate (Ket) on EAE development. EAE was induced in C57BL/6 mice by immunization with MOG35-55 and the animals were injected daily with Ket from the seventh to the 17th day after disease induction. This early intervention with Ket significantly reduced disease prevalence and severity. The protective effect was concomitant with less NLRP3 inflammasome activation, rebalanced oxidative stress and also reduced T cell infiltration at the CNS. Even though Ket administration did not alter mast cell percentage at the CNS, it decreased the local CPA3 and CMA1 mRNA expression that are enzymes typically produced by these cells. Evaluation of the CNS-barrier permeability indicated that Ket clearly restored the permeability levels of this barrier. Ket also triggered an evident lymphadenomegaly due to accumulation of T cells that produced higher levels of encephalitogenic cytokines in response to in vitro stimulation with MOG. Altogether these findings reinforce the concept that mast cells are particularly relevant in MS immunopathogenesis and that Ket, a known stabilizer of their activity, has the potential to be used in MS control.

Keywords

Experimental autoimmune encephalomyelitis Multiple sclerosis Blood-CNS barrier Ketotifen fumarate Inflammasome Oxidative stress 

Notes

Acknowledgements

The authors are grateful to researchers Camila Peres Buzalaf and Ana Paula Campanelli for their help concerning cytometry data analysis. The authors also thank Fatima Silveira, Luiz Carlos da Silva and Hélio Kushima for technical support. Funding was provided by São Paulo Research Foundation – FAPESP [grant number 2014/00239-6]. The authors declare no conflicts of interest.

Required Author Forms Disclosure forms provided by the authors are available with the online version of this article.

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Copyright information

© The American Society for Experimental NeuroTherapeutics, Inc. 2019

Authors and Affiliations

  • Karen Henriette Pinke
    • 1
    Email author
  • Sofia Fernanda Gonçalves Zorzella-Pezavento
    • 1
  • Thais Fernanda de Campos Fraga-Silva
    • 1
  • Luiza Ayumi Nishiyama Mimura
    • 1
  • Larissa Ragozo Cardoso de Oliveira
    • 1
  • Larissa Lumi Watanabe Ishikawa
    • 1
  • Ana Angélica Henrique Fernandes
    • 2
  • Vanessa Soares Lara
    • 3
  • Alexandrina Sartori
    • 1
  1. 1.Department of Microbiology and ImmunologyInstitute of Biosciences, São Paulo State University (UNESP)BotucatuBrazil
  2. 2.Department of Chemistry and BiochemistryInstitute of Biosciences, São Paulo State University (UNESP)BotucatuBrazil
  3. 3.Department of Surgery, Stomatology, Pathology and RadiologyBauru School of Dentistry, University of São Paulo (USP)BauruBrazil

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