Human neuroblastoma cells (SH-SY5Y) (kindly provided by Dr. Stefan Lichtenthaler, German Center for Neurodegenerative Diseases, Germany) were maintained in DMEM/F12 medium (1:1) supplemented with 15% Fetal Bovine Serum, 2 mM L-glutamine, antibiotic/antimycotic mix (all from Sigma-Aldrich) and 1% non-essential amino acids (Gibco) [17 (link)].
Wild type mouse embryonic fibroblasts (MEFwt), cathepsin B/L knockout (KO) MEFs (CtsB-/-, CtsL-/-, CtsB-/-L-/-) (kindly provided by Dr. Oliver Schilling, Institute for Molecular Medicine and Cell Research, University of Freiburg, Germany) and cathepsin D KO MEFs (CtsD-/-) (kindly provided by Dr. Paul Saftig, Institute of Biochemistry, Kiel, Germany) were maintained in DMEM GlutaMAX medium (Gibco) supplemented with 10% Fetal Bovine Serum and antibiotic/antimycotic mix (all from Sigma-Aldrich) [18 (link);19 (link)].