Astroglial S100B Secretion Is Mediated by Ca Mobilization from Endoplasmic Reticulum: A Study Using Forskolin and DMSO as Secretagogues.

S100B, a homodimeric Ca-binding protein, is produced and secreted by astrocytes, and its extracellular levels have been used as a glial marker in brain damage and neurodegenerative and psychiatric diseases; however, its mechanism of secretion is elusive. We used primary astrocyte cultures and calcium measurements from real-time fluorescence microscopy to investigate the role of intracellular calcium in S100B secretion. In addition, the dimethyl sulfoxide (DMSO) effect on S100B was investigated in vitro and in vivo using Wistar rats.