Abstract
To study their cytotoxicity, clays containing aluminum silicates were added to cultures of primary murine spinal cord neurons and differentiated N1E-115 neuroblastoma cells. Bentonite (0.1 mg/ml) and montmorillonite (0.1 mg/ml) rapidly associated with the outer membrane of both N1E-115 and neuronal cells. Erionite (0.1 mg/ml) was randomly distributed throughout the culture. Both bentonite and montmorillonite caused complete cell lysis in the neuronal cultures within 60 min following addition. Erionite had no effect. None of the clays appeared to be cytotoxic to the differentiated N1E-115 cells even though bentonite and montmorillonite were closely associated with the cell membrane. N1E-115 cell lysis did not occur up to 18 h after addition of the clay. Aluminum silicate-containing clays caused a rapid lysis of primary neuronal cells. Differentiated N1E-115 neuroblastoma cells were not susceptible to clay-induced lysis, suggesting that the lytic mechanism is not a general phenomenon that affects all cell types equally.
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