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2015 ; 9
(ä): 458
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The Role of Stefin B in Neuro-inflammation
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Kopitar-Jerala N
Front Cell Neurosci
2015[]; 9
(ä): 458
PMID26696823
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Stefin B (cystatin B) is an endogenous cysteine cathepsin inhibitor localized in
the cytosol, mitochondria and nucleus. Its expression is upregulated upon
macrophage activation and cellular stress. Mutations in the gene of stefin B are
associated with the neurodegenerative disease known as Unverricht-Lundborg
disease (EPM1). It was reported that early microglial activation precedes
neuronal loss in the brain of the stefin B-deficient mice, implying a role of the
inhibitor at the cross-talk between microglia and cerebellar cells. Detailed
analysis of microglial activation in stefin B-deficient microglia showed a
significantly higher proportion of both pro-inflammatory M1 and anti-inflammatory
M2 microglia in stefin B-deficient mouse brain compared with control mice. In our
recent work, we demonstrated that stefin B-deficient mice were significantly more
sensitive to the lethal lipopolysaccharide (LPS)-induced sepsis, due to increased
caspase-11 expression and secreted higher amounts of pro-inflammatory cytokines
IL-1? and IL-18. Upon LPS stimulation, stefin B was targeted into the
mitochondria, and the lack of stefin B resulted in the increased destabilization
of the mitochondrial membrane potential and mitochondrial superoxide generation.
The increased caspase-11 gene expression and better pro- inflammatory caspase-1
and -11 activation determined in stefin B deficient bone marrow-derived
macrophages resulted in enhanced non-canonical inflammasome activation. Since
signaling pathways in macrophages could be compared to the ones in microglia we
propose that inflammasome activation could play an important role in the
pathogenesis of EPM1.