Abstract
Little is known about the signal transduction pathways of TRK family receptors in neuroblastoma (NB) cells. In this study, an NB cell line, designated MP‐N‐TS, was established from an adrenal tumor taken from a 2‐year‐old boy. This cell line expressed both TRK‐A and TRK‐B receptors, which is rare in a single NB cell line. Therefore, the MP‐N‐TS cell line was used to determine whether the signal transduction through these constitutive receptors is functional. Three neurotrophins, nerve growth factor (NGF), brain‐derived neurotrophic factor (BDNF) and neurotrophin‐4/ 5 (NT‐4/5), induced tyrosine phosphorylation of panTRK, and BDNF and NT‐4/5 induced tyrosine phosphorylation of TRK‐B. Tyrosine phosphorylation of panTRK and/or TRK‐B by the neurotro‐phins was inhibited in the presence of a tyrosine kinase inhibitor K252a. Tyrosine phosphorylation of Src homologous and collagen (She), extracellular signal‐regulated kinase (ERK)‐l and ERK‐2, and phospholipase C‐γl (PLC‐γl) was increased by the three neurotrophins and the increase was inhibited in the presence of K252a. Activation of Ras, detected as the GTP‐bound form of Ras, was induced by the three neurotrophins. The neurotrophins did not modulate the expressions of TRK‐A or TRK‐B mRNA, but they did induce the expression of c‐fos mRNA. Exogenous NGF induced weak neurite outgrowth, whereas exogenous BDNF and NT‐4/5 induced distinct neurite outgrowth. Exogenous BDNF and NT‐4/5 increased the number of viable cells, while NGF did not. Our results demonstrate that the signal transduction pathways through TRK‐A and TRK‐B in MP‐N‐TS cells are functional and similar, and the main downstream signaling pathways from the three neurotrophins are mitogen‐activated protein kinase (MAPK) cascades through She, activated Ras, ERK‐1 and ERK‐2, and the transduction pathway through PLC‐γl. Further, BDNF and NT‐4/5 increased cell viability. The MP‐N‐TS cell line should be useful for clarifying the TRK‐A and TRK‐B signaling pathways responsible for the different prognoses in patients with NB.
Keywords: Signal transduction, Neuroblastoma, TRK, A, TRK‐B, Neurotrophins
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