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MIF Tautomerase Inhibition Protects Neurons From Immune-Mediated Cell Death.

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Macrophage migration inhibitory factor (MIF) tautomerase activity drives neuroinflammation and neurodegeneration in multiple sclerosis (MS). Targeting MIF tautomerase may offer new therapeutic strategies for progressive MS by reducing immune cell infiltration and pathology.

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Area of Science:

  • Neuroimmunology
  • Molecular Medicine
  • Pathophysiology

Background:

  • Multiple sclerosis (MS) involves immune cell infiltration into the central nervous system (CNS), leading to neurodegeneration, with current therapies ineffective against chronic progression.
  • Macrophage migration inhibitory factor (MIF), a protein with cytokine and enzymatic functions, is implicated in MS, with elevated levels in cerebrospinal fluid (CSF) and genetic links to progressive MS.
  • The precise role of MIF's enzymatic functions, particularly its tautomerase activity, in MS pathophysiology remains unclear.

Purpose of the Study:

  • To investigate the specific contribution of MIF's tautomerase enzymatic function to the pathophysiology of MS.
  • To elucidate the cellular and molecular mechanisms by which MIF tautomerase influences neuroinflammation and neurodegeneration in a mouse model of MS.

Main Methods:

  • Utilized a transgenic mouse model (MIF-P2G) with a mutated MIF tautomerase domain to study its non-nuclease function.
  • Employed flow cytometry and immunohistochemistry to analyze cellular and molecular changes in the experimental autoimmune encephalomyelitis (EAE) mouse model.

Main Results:

  • MIF tautomerase activity was found to promote immune cell infiltration, glial cell proliferation, and neuroaxonal degeneration in the EAE model.
  • Mice deficient in MIF tautomerase exhibited reduced paralysis and less neuroaxonal pathology in the optic nerve and spinal cord.
  • MIF-P2G mutated mice showed decreased peripheral immune cell trafficking, reactive gliosis, neuroinflammation, and neurodegeneration during EAE.

Conclusions:

  • The tautomerase domain of MIF plays a significant role in driving peripheral immune-mediated neurodegeneration in neuroinflammatory conditions like MS.
  • These findings highlight MIF tautomerase as a potential therapeutic target for mitigating neurodegeneration in MS.