Mapping and partial characterization of proteases expressed by a CHO production cell line

2006 ◽  
Vol 95 (5) ◽  
pp. 961-971 ◽  
Author(s):  
H. Sandberg ◽  
D. Lütkemeyer ◽  
S. Kuprin ◽  
M. Wrangel ◽  
A. Almstedt ◽  
...  
Keyword(s):  
Cell Line ◽  
Partial Characterization ◽  
Production Cell Line ◽  
Production Cell

Glycophorin expression in murine erythroleukaemia cells

1989 ◽  
Vol 92 (2) ◽  
pp. 163-171
Author(s):  
J.B. Ulmer ◽  
E.D. Dolci ◽  
G.E. Palade
Keyword(s):  
Cell Line ◽  
Electrophoretic Mobility ◽  
Normal Mouse ◽  
Fatty Acyl ◽  
Dimethyl Sulphoxide ◽  
Partial Characterization ◽  
Polyacrylamide Gels ◽  
Putative Precursor

We have identified mature and putative precursor forms of glycophorins expressed in a virus-transformed murine erythroleukaemia (MEL) cell line and compared them with their normal erythroblast counterparts. The following differences were found: (1) the two major MEL cell glycophorins (apparent Mr values 29–30 and 43(x10(3] have greater mobility on polyacrylamide gels than their normal gp-3 and gp-2 counterparts, due at least in part to differences in their oligosaccharide sidechains; (2) MEL cell gp-3 consists of two discrete proteins; and (3) there are more potential glycophorin precursors in MEL cells than in normal mouse erythroblasts. Four proteins, with apparent Mr values of 21, 23, 26 and 27(x10(3], have tentatively been identified as glycophorin precursors, based on the following findings: (1) they are immunologically related to the glycophorins; and (2) their synthesis was induced by dimethyl sulphoxide coincidentally with that of gp-3 and gp-2. They do not appear to be glycoproteins, as evidenced by their lack of incorporation of [3H]galactose, [3H]glucosamine or [3H]mannose. In contrast, gp-3 and gp-2 incorporated [3H]galactose and [3H]glucosamine but not [3H]mannose. Partial characterization of the glycan moieties of MEL cell glycophorins indicates that they consist mostly of tri- and tetrasaccharides, with no indication of any N-linked chains. Hence, the glycans of MEL cell glycophorins are mostly (if not all) O-linked. Furthermore, treatment with N-glycanase did not change their electrophoretic mobility on polyacrylamide gels. MEL cell glycophorins were also shown to be modified by phosphoryl and fatty acyl groups.

Partial characterization of an immortalized human trophoblast cell-line, TCL-1, which possesses a CSF-1 autocrine loop

Placenta ◽  
1996 ◽  
Vol 17 (2-3) ◽  
pp. 137-146 ◽  
Author(s):  
M.P. Lewis ◽  
M. Clements ◽  
S. Takeda ◽  
P.L. Kirby ◽  
H. Seki ◽  
...  
Keyword(s):  
Cell Line ◽  
Trophoblast Cell ◽  
Partial Characterization ◽  
Human Trophoblast ◽  
Autocrine Loop ◽  
Trophoblast Cell Line
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