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Lithium induces morphological differentiation of mouse neuroblastoma cells
Author(s) -
GarcíaPérez Julia,
Avila Jesús,
DíazNido Javier
Publication year - 1999
Publication title -
journal of neuroscience research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.72
H-Index - 160
eISSN - 1097-4547
pISSN - 0360-4012
DOI - 10.1002/(sici)1097-4547(19990715)57:2<261::aid-jnr12>3.0.co;2-4
Subject(s) - gsk 3 , neurite , cellular differentiation , microbiology and biotechnology , biology , kinase , lithium (medication) , neuroblastoma , protein kinase a , chemistry , endocrinology , cell culture , biochemistry , in vitro , genetics , gene
Neuroblastoma cells are used as a model system to study neuronal differentiation. Here we describe the induction of morphological differentiation of mouse neuroblastoma Neuro 2a (N2a) cells by treatments with either chemical inhibitors of cyclin‐dependent kinases or lithium, which inhibits glycogen synthase kinase‐3. Cyclin‐dependent kinase inhibitors cause a rapid cell cycle block as well as the extension of multiple neurites per cell. These multipolar differentiated cells then undergo a massive death. However, lithium promotes a delayed mitotic arrest and the extension of one or two long neurites per cell. This differentiation is maximal after 48 hours of lithium treatment and the differentiated cells remain viable for long periods of time. Neuronal differentiation in lithium‐treated cells is preceded by the accumulation of β‐catenin, a protein which is efficiently proteolyzed when it is phosphorylated by glycogen synthase kinase‐3. Both neuronal differentiation and β‐catenin accumulation are observed in lithium‐treated cells either in the absence or in the presence of supraphysiological concentrations of inositol. The results are consistent with the hypothesis that inhibition of glycogen synthase kinase‐3 by lithium triggers the differentiation of neuroblastoma N2a cells. J. Neurosci. Res. 57:261–270, 1999. © 1999 Wiley‐Liss, Inc.