Cited by 97Viral Infectious Diseases and Gene Expression in InsectsGlycosylation and Glycoproteins ResearchProtein purification and stability

RNA interference of sialidase improves glycoprotein sialic acid content consistency

Ngantung, Frederyk A., Miller, Peter G., Brushett, Fikile R., Tang, Goh Lin, Wang, Daniel I.C.·2006·Biotechnology and Bioengineering

Abstract

An important challenge facing therapeutic protein production in mammalian cell culture is the cleavage of terminal sialic acids on recombinant protein glycans by the glycosidase enzymes released by lysed cells into the supernatant. This undesired phenomenon results in a protein product which is rapidly cleared from the plasma by asialoglycoprotein receptors in the liver. In this study, RNA interference was utilized as a genetic approach to silence the activity of sialidase, a glycosidase responsible for cleaving terminal sialic acids on IFN‐γ produced by Chinese Hamster Ovary (CHO) cells. We first identified a 21‐nt double stranded siRNA that reduced endogenous sialidase mRNA and protein activity levels. Potency of each siRNA sequences was compared using real time RT‐PCR and a sialidase activity assay. We next integrated the siRNA sequence into CHO cells, allowing production and selection of stable cell lines. We isolated stable clones with sialidase activity reduced by over 60% as compared to the control cell line. Micellar electrokinetic chromatography (MEKC), thiobarbituric acid assay (TAA), and high performance anion exchange chromatography (HPAEC) coupled to amperometric detection were performed to analyze glycan site occupancy, sialic acid content, and distribution of asialo‐/sialylated‐glycan structures, respectively. Two of the stable clones successfully retained the full sialic acid content of the recombinant IFN‐γ, even upon cells' death. This was comparable to the case where a chemically synthesized sialidase inhibitor was used. These results demonstrated that RNA interference of sialidase can prevent the desialylation problem in glycoprotein production, resulting improved protein quality during the entire cell culture process. © 2006 Wiley Periodicals, Inc.

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Crossref · 10.1002/bit.20997

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  • Some attempts of knocking down the different CHO sialidases by shRNA or siRNA also improved the sialylation level of recombinant hIFNγ, particularly for Neu2 and Neu3 sialidases.

    “Some attempts of knocking down the different CHO sialidases by shRNA or siRNA also improved the sialylation level of recombinant hIFNγ, particularly for Neu2 and Neu3 sialidases (Ngantung et al., 2006;Zhang et al., 2010b).”

    From Therapeutic glycoprotein production in mammalian cells (2017) · cites this paper as Ngantung et al., 2006

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Authors
Ngantung, F. A., Miller, P. G., Brushett, F. R., Tang, G. L., & Wang, D. I. C.
Affiliations
  • Massachusetts Institute of Technology (US)
  • University of Pennsylvania (US)
  • Agency for Science, Technology and Research (SG)
Corresponding author
Wang, Daniel I.C.
Venue
Biotechnology and Bioengineering
Publisher
Wiley
Published
2006-05-03
Volume
95
Issue
1
Pages
106-119
ISSN
  • 0006-3592 (ISSN-L)
  • 1097-0290
OpenAlex
W2052231275
Cited by
97
References
51
Citations by year
2026: 2 · 2025: 1 · 2024: 2 · 2023: 2 · 2022: 3 · 2021: 7 · 2020: 1 · 2019: 7 · 2018: 4 · 2017: 7 · 2016: 4 · 2015: 10 · 2014: 7 · 2013: 4 · 2012: 5
FWCI
1.76
Type
journal article
Language
en
Open access
closed
Locations
  • Biotechnology and Bioengineering (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Viral Infectious Diseases and Gene Expression in Insects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Glycosylation and Glycoproteins Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein purification and stability
Keywords
neuraminidase, RNA interference, siRNA, sialic acid, glycoprotein sialylation, desialylation, recombinant protein expression, CHO cells, interferon-gamma, asialoglycoprotein receptor, stable cell lines, glycosidase inhibition
MeSH terms
Animals, Cricetulus, Glycoproteins, Cricetinae, Neuraminidase, Protein Engineering, CHO Cells, N-Acetylneuraminic Acid, Genetic Enhancement, RNA Interference

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