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An immortalized jimpy oligodendrocyte cell line: Defects in cell cycle and cAMP pathway
Author(s) -
Feutz Anne Catherine,
PhamDinh Danielle,
Allinquant Bernadette,
Miehe Monique,
Ghandour M. Said
Publication year - 2001
Publication title -
glia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.954
H-Index - 164
eISSN - 1098-1136
pISSN - 0894-1491
DOI - 10.1002/glia.1058
Subject(s) - oligodendrocyte , biology , galactocerebroside , cell culture , microbiology and biotechnology , transfection , cell cycle , immortalised cell line , cell , myelin , biochemistry , genetics , central nervous system , endocrinology
Abstract Normal and jimpy oligodendrocytes in secondary cultures were transfected with plasmids containing the SV40 T‐antigen gene expressed under the control of the mouse metallothionein‐I promoter. Two immortalized stable cell lines, a normal (158N) and jimpy (158JP) cell line, expressed transcripts and proteins of oligodendrocyte markers, including proteolipid protein (PLP), myelin basic protein (MBP), and carbonic anhydrase II (CAII). Galactocerebroside and sulfatide were also detected with immunocytochemistry. Immunoelectron microscopy using gold particles showed that the truncated endogenous jimpy PLP was distributed throughout the cytoplasm and in association with the plasma membrane of cell bodies and processes. The length of the cell cycle in the jimpy oligodendrocytes in the absence of zinc was 31 h, about a 4‐h longer cell cycle than the normal line. In the presence of 100 μM zinc, the cell cycle became 3 h shorter for both cell lines, with the jimpy cell cycle duration remaining 4 h longer than the normal line. Interestingly, the jimpy cell line showed a significant deficiency in stimulation via the cAMP pathway. While the level of oligodendrocyte markers (PLP, MBP, and CAII) were significantly increased by dibutyryl cAMP (dbcAMP) treatment in the normal cell line, no changes were observed in the jimpy cell lines. This observation, together with previous results showing jimpy oligodendrocyte's failure to respond to basic fibroblast growth factor (bFGF), suggests a role for PLP in a signal transduction pathway. Jimpy and normal oligodendrocytes transfected with the SV40T antigen gene, driven by the wild‐type promoter of mouse metallothionein‐I, continue to express properties of oligodendrocytes and therefore provide a powerful model to explore the function of myelin proteins and to dissect the complexity of the jimpy phenotype. GLIA 34:241–252, 2001. © 2001 Wiley‐Liss, Inc.