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The S100B protein in biological fluids: more than a lifelong biomarker of brain distress
Author(s) -
Michetti Fabrizio,
Corvino Valentina,
Geloso Maria Concetta,
Lattanzi Wanda,
Bernardini Camilla,
Serpero Laura,
Gazzolo Diego
Publication year - 2012
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1111/j.1471-4159.2011.07612.x
Subject(s) - biomarker , paracrine signalling , pathological , biological fluids , oxidative stress , neuroscience , human brain , medicine , biology , physiology , pathology , chemistry , receptor , biochemistry , chromatography
J. Neurochem. (2012) 120 , 644–659. Abstract S100B is a calcium‐binding protein concentrated in glial cells, although it has also been detected in definite extra‐neural cell types. Its biological role is still debated. When secreted, S100B is believed to have paracrine/autocrine trophic effects at physiological concentrations, but toxic effects at higher concentrations. Elevated S100B levels in biological fluids (CSF, blood, urine, saliva, amniotic fluid) are thus regarded as a biomarker of pathological conditions, including perinatal brain distress, acute brain injury, brain tumors, neuroinflammatory/neurodegenerative disorders, psychiatric disorders. In the majority of these conditions, high S100B levels offer an indicator of cell damage when standard diagnostic procedures are still silent. The key question remains as to whether S100B is merely leaked from injured cells or is released in concomitance with both physiological and pathological conditions, participating at high concentrations in the events leading to cell injury. In this respect, S100B levels in biological fluids have been shown to increase in physiological conditions characterized by stressful physical and mental activity, suggesting that it may be physiologically regulated and raised during conditions of stress, with a putatively active role. This possibility makes this protein a candidate not only for a biomarker but also for a potential therapeutic target.