title: Xbp1-based engineering of secretory capacity enhances the productivity of Chinese hamster ovary cells.
abstract: A variety of successful transcription and translation engineering strategies implemented during the past decade have driven the specific productivity of mammalian cells to an apparent limit. Restricted post-translation competence has since been considered the major bottleneck preventing mammalian cells from fully exploiting their physiologic production capacity in a biopharmaceutical manufacturing scenario. Through ectopic expression of the human transcription factor Xbp1 (X-box-binding-protein 1), evolved to manage plasma cell differentiation and coordinate the unfolded protein response, we have specifically expanded the endoplasmic reticulum and the Golgi of transgenic Chinese hamster ovary (CHO-K1)-derived cell lines with a resulting increase in overall production capacity. Xbp-1-based engineering of secretory bottlenecks was compatible with a variety of different promoter–product gene configurations suggesting that Xbp-1 induces generic production increases in CHO-K1 cell derivatives. Secretion engineering, illustrated here by Xbp1-based reprogramming of the post-translational processing machinery, provides a first insight into mastering a major system bottleneck which impacts biopharmaceutical manufacturing of secreted protein therapeutics.
authors.affiliation: Institute for Chemical and Bio-Engineering (ICB), Swiss Federal Institute of Technology-ETH Zurich, Wolfgang-Pauli-Strasse 10,ETH Hoenggerberg, HCI F115, CH-8093 Zurich, Switzerland.
authors.forename: Marcel
authors.initials: M
authors.lastname: Tigges
authors.forename: Martin
authors.initials: M
authors.lastname: Fussenegger
mesh_terms: D000818:Animals; D001702:Biopharmaceutics; D016466:CHO Cells; D006224:Cricetinae; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D004721:Endoplasmic Reticulum / Q000378:metabolism; D015870:Gene Expression; D005786:Gene Expression Regulation; D006801:Humans; D015202:Protein Engineering / Q000379:methods*; D011994:Recombinant Proteins / Q000378:metabolism; D000071701:Regulatory Factor X Transcription Factors; D055571:Secretory Pathway / Q000235:genetics / Q000502:physiology*; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism; D000071717:X-Box Binding Protein 1
chemical_list: D004268:DNA-Binding Proteins; D011994:Recombinant Proteins; D000071701:Regulatory Factor X Transcription Factors; D014157:Transcription Factors; D000071717:X-Box Binding Protein 1; C000605543:XBP1 protein, human