Abstract
To improve recombinant human bone morphogenetic protein-2 (rhBMP-2) yield, cell lines stably expressing hBMP2 were cultured in the presence of polyarginine peptide IND-1 and showed up to 6-fold increase in the yield of mature BMP-2. Repeated addition of IND-1 to cell cultures consistently improved BMP-2 yields over 53 days without affecting cell growth and viability. Investigation of its mechanism of action showed that IND-1 inhibited pro-protein convertase (PC) activity when incubated with cell lysates. However, when intact cells were cultured with IND-1, no change in cellular PC activity was observed. Furthermore, knockdown of furin (a prototypical member of the PCs) in cells did not affect their BMP-2 yields, suggesting furin/PC inhibition is unlikely the mechanism by which IND-1 enhances BMP-2 yields. IND-1 as a medium additive thus enhances BMP-2 production in mammalian cell expression systems.
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Acknowledgment
This work was supported in part by Oral Surgery Foundation of Canada and McEwen Research Fund (#199-03-1570). A.J.Z. is a recipient of a Natural Sciences and Engineering Council Post-Graduate Scholarship (NSERC-PGS) scholarship. We are grateful to Dr. Michelle Visser for careful scrutiny of several drafts of this manuscript.
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A patent application has been filed describing methods that enhance the production of recombinant proteins, which includes the methods described in this paper (“Methods for enhancing recombinant protein production” (PCT/CA2008/000998)). This pending patent application has been assigned to Induce Biologics Inc. SAFP and CMLC are shareholders in Induce Biologics Inc. SAFP is an employee of Induce Biologics Inc.
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Supplementary Fig. 1
Mature and proBMP-2 yields of CHO-BMP2 cells incubated with furininhibitor decanoyl-RVKR-chloromethylketone (CMK) for 48 h, measured by ELISA. Data are presented as mean ± SD (**P <0.01, ***P <0.001). (TIFF 11850 kb)
Supplementary Fig. 2
BMP-2 yields of CHO-BMP2 cells treated with IND-1 (80 μM) or D-arg (720μM, equivalent of 80 μM IND-1), measured by BMP-2 ELISA. Data are presented as mean ± SD(***P <0.001). (TIFF 8518 kb)
Supplementary Fig. 3
CHO-BMP2 cells were incubated with polyarginine peptides consisting of seven positively D-arginines (7R) with different net charges, created by inserting negatively charged aspartic acids (D) at the ends or throughout the peptide. The cells were treated with (A) 7R-201(COCH3-RRRRRRR-COOH, net charge +5), (B) 7R-202 (COCH3-DDRRRRRRRDD-COOH, +1),(C) 7R-203 (COCH3-DDDRRRRRRRDDD-COOH, -1), (D) 7R-303 (COCH3-RDRRDRRDRRDCOOH, +1) and (E) 7R-304 (COCH3-DRDRRDRRDRRDD-COOH, -1). After 48 h incubation, secreted BMP-2 in the condition media was measured by ELISA. Data are presented as mean ± SD (***P <0.001). (TIFF 20953 kb)
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Zhou, A.J., Clokie, C.M.L. & Peel, S.A.F. Polyarginine peptide IND-1 enhances recombinant human bone morphogenetic protein-2 yield in mammalian cells. Biotechnol Lett 34, 221–230 (2012). https://doi.org/10.1007/s10529-011-0781-7
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DOI: https://doi.org/10.1007/s10529-011-0781-7