ESTABLISHMENT AND CHARACTERIZATION OF A CHO CELL-LINE PRODUCING A SECRETED FORM OF HUMAN CILIARY NEUROTROPHIC FACTOR - NEUROPROTECTIVE EFFECTS OF THE RECOMBINANT PROTEIN
A. Negro et al., ESTABLISHMENT AND CHARACTERIZATION OF A CHO CELL-LINE PRODUCING A SECRETED FORM OF HUMAN CILIARY NEUROTROPHIC FACTOR - NEUROPROTECTIVE EFFECTS OF THE RECOMBINANT PROTEIN, Molecular brain research, 21(1-2), 1994, pp. 124-132
Human ciliary neurotrophic factor (CNTF) was inserted into a mammalian
expression vector linked to the prepro sequence of human nerve growth
factor. A Chinese hamster ovary cell line was established by resistan
ce to neomycin and the plasmid integrated DNA was amplified using the
metallothionein gene. This cell line contained several hundred copies
of the human CNTF gene and produced an NH2 terminal truncated form of
human CNTF (22 kDa) which was secreted into the medium. Although the c
opy number of the human CNTF gene was high and its mRNA was actively t
ranscribed, the recombinant protein secreted into the medium constitut
ed only 35-40% of the total amount of human CNTF synthesized by these
cells. Both wild-type human CNTF produced in bacterial cells and the h
uman CNTF obtained by forced secretion were effective in protecting hi
ppocampal pyramidal neurons from injury induced by glucose deprivation
, a form of excitotoxic neurodegeneration.