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Volume 17, Number 4,
Issue of February 15, 1997
pp. 1217-1225
Copyright ©1997 Society for Neuroscience
Characterization of a CNS Cell Line, CAD, in which Morphological
Differentiation Is Initiated by Serum Deprivation
Received Sept. 25, 1996; revised Nov. 20, 1996; accepted Nov. 25, 1996.
Yanping Qi2,
James K. T. Wang2,
Michael McMillian1, and
Dona M. Chikaraishi1
1 Department of Neurobiology, Duke University Medical
Center, Durham, North Carolina 27710, and 2 Department of
Neuroscience, Tufts University School of Medicine, Boston,
Massachusetts 02111
A CNS catecholaminergic cell line, Cath.a, was established by
targeted oncogenesis in transgenic mice. Cath.a cells express neuronal
properties but lack neuronal morphology. Here, we describe a variant of
Cath.a, called CAD (Cath.a-differentiated), in which reversible
morphological differentiation can be initiated by removal of serum or
exogenously added protein from the medium. In serum- or protein-free
media, CAD cells stop proliferating and extend long processes.
Differentiated CAD cells can be maintained without serum or protein for
at least 6 weeks. CAD cells are distinct from Cath.a cells; most
significant, the original immortalizing oncogene, SV40 T antigen, was
spontaneously lost. By immunostaining or immunoblotting, we show that
CAD cells express neuron-specific proteins, such as class III
-tubulin, GAP-43, SNAP-25, and synaptotagmin, but not GFAP.
Ultrastructurally, processes from differentiated CAD cells have
abundant parallel microtubules and intermediate filaments, and bear
varicosities that contain both large dense-core vesicles/granules
(120-160 nm) and smaller clear vesicles (60-80 nm). Additionally, CAD
cells express enzymatically active tyrosine hydroxylase and accumulate
L-DOPA. CAD cells exhibit biochemical and morphological
characteristics of primary neurons and provide an unique tool for
studying neuronal differentiation.
Key words:
CNS cell line;
catecholamine;
tyrosine hydroxylase;
neuronal differentiation;
T antigen;
microtubule;
intermediate
filament;
synaptic vesicle
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