APP and neuroblastoma: Oligomeric Abeta but not fibrillar Abeta42 decreases specifically phospho-CREB and the BDNF transcripts IV and V in differentiated SH-SY5Y neuroblastoma cells (Garzon & Fahnestock 2007), confirming the data that sublethal doses of Abeta without specifying the aggregation form downregulate BDNF and CREB in cultured cortical neurons (Tong et al.2001b, 2004).