Neurotrophin 3/TrkC‐regulated proteins in the human medulloblastoma cell line DAOY

AbstractMedulloblastoma (MB) is the most common malignant childhood brain tumor and high neurotrophin (NP) receptor TrkC mRNA expression was identified as a powerful independent predictor of favorable survival outcome. In order to determine downstream effector proteins of TrkC signaling, the MB cell line DAOY was stably transfected with a vector containing the full‐length TrkC cDNA sequence or an empty vector control. A proteomic approach was used to search for expressional changes by two mass spectrometric methods and immunoblotting for validation of significant results. Multiple time points for up to 48 h following NP‐3‐induced TrkC receptor activation were chosen. Thirteen proteins from several pathways (nucleoside diphosphate kinase A, stathmin, valosin‐containing protein, annexin A1, dihydropyrimidinase‐related protein‐3, DJ‐1 protein, glutathione S‐transferase P, lamin A/C, fascin, cofilin, vimentin, vinculin, and moesin) were differentially expressed and most have been shown to play a role in differentiation, migration, invasion, proliferation, apoptosis, drug resistance, or oncogenesis. Knowledge on effectors of TrkC signaling may represent a first useful step for the identification of marker candidates or reflecting probable pharmacological targets for specific treatment of MB.