Concomitant induction of apoptosis and necrosis in cerebellar granule cells following serum and potassium withdrawal.

Serum and potassium withdrawal-induced cell death of cerebellar granule cells is one of the most popular models used for studying neuronal apoptosis in vitro, and it is generally assumed that compounds preventing cell death in this model prevent apoptosis. In the present study we demonstrate that serum and potassium withdrawal induces a mixture of apoptosis and necrosis rather than apoptosis only. Each of these death mechanisms could be blocked by activation of different pathways, such as raising cAMP production or stimulation of the IGF-1 receptor. Studies on serum and potassium withdrawal-induced cell death of cerebellar granule cells should therefore carefully assess whether a given compound is preventing apoptosis or necrosis using appropriate techniques.