Recombinant plasmids containing a complementary deoxyribonucleic acid coding mouse endostatin were transfected and stably expressed in Drosophila melanogaster Schneider 2 (S2) cells. Stably transformed polyclonal cell populations expressing recombinant endostatin were isolated after 4 wk of selection with hygromycin B. Recombinant endostatin expressed in the stably transformed S2 cells under the influence of the Drosophila BiP protein signal sequence was secreted into the medium. Recombinant endostatin was also purified to homogeneity using a simple one-step Ni2 affinity fractionation method. Purified recombinant endostatin inhibited endothelial cell proliferation in a dose-dependent manner. The concentration at maximum inhibition for recombinant endostatin was approximately 1.8 μg/ml. The stably transformed S2 cells produced 18 mg recombinant endostatin/L 7 d after induction with 5 μM CdCl2. Sodium butyrate supplementation (2.5 mM) increased recombinant endostatin production by 17%. These findings demonstrate optimal production and in vitro activity of recombinant endostatin from stably transformed D. melanogaster S2 cells.
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1 January 2001
OPTIMAL PRODUCTION AND IN VITRO ACTIVITY OF RECOMBINANT ENDOSTATIN FROM STABLY TRANSFORMED DROSOPHILA MELANOGASTER S2 CELLS
JONG HWA PARK,
KYUNG HWA CHANG,
JONG MIN LEE,
YOUN HYUNG LEE,
IN SIK CHUNG
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In Vitro Cellular & Developmental Biology - Animal
Vol. 37 • No. 1
January 2001
Vol. 37 • No. 1
January 2001
activity
Drosophila melanogaster
endostatin
S2 cells
sodium butyrate