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Three forms of RPTP‐β are differentially expressed during gliogenesis in the developing rat brain and during glial cell differentiation in culture
Author(s) -
Canoll P.D.,
Petanceska S.,
Schlessinger J.,
Musacchio J.M.
Publication year - 1996
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(19960501)44:3<199::aid-jnr1>3.0.co;2-b
Subject(s) - gliogenesis , neuroscience , cell culture , biology , microbiology and biotechnology , genetics , neural stem cell , stem cell
In situ hybridization and Northern analysis demonstrate that the three splicing variants of RPTP‐β have different spatial and temporal patterns of expression in the developing brain. The 9.5‐kb and 6.4‐kb transcripts, which encode transmembrane protein tyrosine phosphatases with different extracellular domains, are predominantly expressed in glial progenitors located in the subventricular zone (SVZ). The 8.4‐kb transcript, which encodes a secreted chondroitin sulfate proteoglycan (phosphacan), is expressed at high levels by more mature glia that have migrated out of the SVZ. The three transcripts are also differentially expressed in glial cell cultures; O2A progenitors express high levels of the 9.5‐ and 8.4‐kb transcript, whereas type 1 astrocyte progenitors predominantly express the 6.4‐kb transcript. C6 gliomas also express high levels of the 6.4‐kb transcript. Treating C6 cells with the differentiating agent dibutyryl cyclic‐AMP (DBcAMP), induces a decrease in the 6.4‐kb transcript and a corresponding increase in the 8.4‐kb transcript. O2A cells grown in the presence of basic fibroblast growth factor (bFGF) and platelet‐derived growth factor (PDGF) remain highly proliferative and undifferentiated, and continue to express high levels of RPTP‐β. However, when O2A cells are grown in conditions that induce oligodendrocyte differentiation, there is a marked decrease in the expression of the transmembrane forms of RPTP‐β, as determined by immunofluorescence. These results demonstrate that RPTP‐β expression is regulated during glial cell differentiation and suggest that the different forms of RPTP‐β perform distinct functions during brain development. © 1996 Wiley‐Liss, Inc.