1
|
Effect of protein immunogenicity and PEG size and branching on the anti-PEG immune response to PEGylated proteins. Process Biochem 2017. [DOI: 10.1016/j.procbio.2016.09.029] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
2
|
Preparation and preliminary characterization of recombinant neurolysin for in vivo studies. J Biotechnol 2016; 234:105-115. [PMID: 27496565 DOI: 10.1016/j.jbiotec.2016.07.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Revised: 07/05/2016] [Accepted: 07/11/2016] [Indexed: 11/23/2022]
Abstract
The goal of this study was to produce milligram quantities of pure, catalytically active, endotoxin-free recombinant neurolysin (rNln) in standard laboratory conditions for use as a research tool. To this end, we transformed E. coli cells with a plasmid construct for polyhistidine-tagged rNln, selected a high-expressing clone and determined the optimal time-point for translation of rNln. rNln was purified to homogeneity from the soluble pool of the cell lysate using Ni-NTA affinity and size-exclusion chromatography, followed by removal of endotoxins. Using this protocol ∼3mg pure, catalytically active and nearly endotoxin-free (≈0.003EU/μg protein) rNln was reproducibly obtained from 1l of culture. Lack of cytotoxicity of rNln preparation was documented in cultured mouse cells, whereas stability in whole mouse blood. Intraperitonealy administered rNln in mice reached the systemic circulation in intact and enzymatically active form with Tmax of 1h and T1/2 of ∼30min. Administration of rNln (2 and 10mg/kg) did not alter arterial blood pressure, heart rate, body temperature and blood glucose levels in mice. These studies demonstrate that the rNln preparation is suitable for cell culture and in vivo studies and can serve as a research tool to investigate the (patho)physiological function of this peptidase.
Collapse
|
3
|
Palesch D, Boldt F, Müller JA, Eisele K, Stürzel CM, Wu Y, Münch J, Weil T. PEGylated Cationic Serum Albumin for Boosting Retroviral Gene Transfer. Chembiochem 2016; 17:1504-8. [PMID: 27239020 DOI: 10.1002/cbic.201600193] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Indexed: 01/28/2023]
Abstract
Retroviral vectors are common tools for introducing genes into the genome of a cell. However, low transduction rates are a major limitation in retroviral gene transfer, especially in clinical applications. We generated cationic human serum albumin (cHSA) protected by a shell of poly(ethylene glycol) (PEG); this significantly enhanced retroviral gene transduction with potentially attractive pharmacokinetics and low immunogenicity. By screening a panel of chemically optimized HSA compounds, we identified a very potent enhancer that boosted the transduction rates of viral vectors. Confocal microscopy revealed a drastically increased number of viral particles attached to the surfaces of target cells. In accordance with the positive net charge of cationic and PEGylated HSA, this suggests a mechanism of action in which the repulsion of the negatively charged cellular and viral vector membranes is neutralized, thereby promoting attachment and ultimately transduction. Importantly, the transduction-enhancing PEGylated HSA derivative evaded recognition by HSA-specific antibodies and macrophage activation. Our findings hold great promise for facilitating improved retroviral gene transfer.
Collapse
Affiliation(s)
- David Palesch
- Institute of Molecular Virology, Ulm University Medical Center, Meyerhofstrasse 1, 89081, Ulm, Germany
| | - Felix Boldt
- Institute of Organic Chemistry III/Macromolecular Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Janis A Müller
- Institute of Molecular Virology, Ulm University Medical Center, Meyerhofstrasse 1, 89081, Ulm, Germany
| | - Klaus Eisele
- Institute of Organic Chemistry III/Macromolecular Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Christina M Stürzel
- Institute of Molecular Virology, Ulm University Medical Center, Meyerhofstrasse 1, 89081, Ulm, Germany
| | - Yuzhou Wu
- Institute of Organic Chemistry III/Macromolecular Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Jan Münch
- Institute of Molecular Virology, Ulm University Medical Center, Meyerhofstrasse 1, 89081, Ulm, Germany.
| | - Tanja Weil
- Institute of Organic Chemistry III/Macromolecular Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany.
| |
Collapse
|
4
|
Mainini F, Larsen DS, Webster GA, Young SL, Eccles MR. Bridging Small Molecules to Modified Bacterial Microparticles Using a Disulphide Linkage: MIS416 as a Cargo Delivery System. PLoS One 2015; 10:e0145403. [PMID: 26695183 PMCID: PMC4687933 DOI: 10.1371/journal.pone.0145403] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Accepted: 12/03/2015] [Indexed: 11/18/2022] Open
Abstract
MIS416 is an intact minimal cell wall skeleton derived from Proprionibacterium acnes that is phagocytosed by antigen presenting cells, including dendritic cells (DCs). This property allows MIS416 to be exploited as a vehicle for the delivery of peptide antigens or other molecules (for example, nucleic acids) to DCs. We previously showed that covalent (non-cleavable) conjugation of OVA, a model antigen derived from ovalbumin, to MIS416 enhanced immune responses in DCs in vivo, compared to unconjugated MIS416 and OVA. Intracellular trafficking promotes the lysosomal degradation of MIS416, leading to the destruction of MIS416 plus the associated cargos conjugated to MIS416. However, lysosomal degradation of cargo may not be desired for some MIS416 conjugates. Here we have investigated whether a cleavable linkage could facilitate release of the cargo in the cytoplasm of DCs to avoid lysosomal degradation. DCs were treated in vitro with disulfide-containing conjugates, and as hypothesised faster release of SIINFEKL peptide in the cytoplasm of DCs was observed with the inclusion of a disulfide bond between MIS416 and cargo. The inclusion of a cleavable disulfide bond in the conjugates did not significantly alter the amount of SIINFEKL antigens presented on MHC I molecules on DCs as compared with conjugates without a disulfide bond. However, the conjugates containing disulfide-linkages performed either slightly better (p<0.05) than, or the same as conjugates without a disulfide bond with respect to in vitro OT-1 T-cell proliferation induced by the presentation of SIINFEKL antigens on DCs, or DC activation studies, respectively. However, disulfide-containing conjugates were less effective than conjugates without a disulfide bond in in vivo cytotoxicity assays. In conclusion, inclusion of a disulfide bond in MIS416-peptide conjugates was associated with efficient release of peptides in the cytoplasm of DCs, an important consideration for MIS416-mediated delivery of degradation-sensitive cargoes. However, treatment of DCs with disulfide-containing conjugates did not significantly alter the presentation of peptide antigens on MHC class I molecules to T-cells, or greatly enhance antigen-associated T-cell proliferation in vitro.
Collapse
Affiliation(s)
| | - David S. Larsen
- Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Gill A. Webster
- Innate Immunotherapeutics Ltd, 4B Walls Rd, Penrose, Auckland, New Zealand
| | - Sarah L. Young
- Department of Pathology, University of Otago, Dunedin, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, 3A Symonds Street, Auckland, New Zealand
| | - Michael R. Eccles
- Department of Pathology, University of Otago, Dunedin, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, 3A Symonds Street, Auckland, New Zealand
- * E-mail:
| |
Collapse
|
5
|
Wu L, Ji S, Hu T. N-Terminal Modification with Pseudo-Bifunctional PEG-Hexadecane Markedly Improves the Pharmacological Profile of Human Growth Hormone. Mol Pharm 2015; 12:1402-11. [DOI: 10.1021/mp500680p] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ling Wu
- National
Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- University of
Chinese Academy of Sciences, Beijing 100190, China
| | - Shaoyang Ji
- National
Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Tao Hu
- National
Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| |
Collapse
|
6
|
Wei Y, Thyparambil AA, Wu Y, Latour RA. Adsorption-induced changes in ribonuclease A structure and enzymatic activity on solid surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:14849-14858. [PMID: 25420087 PMCID: PMC4270395 DOI: 10.1021/la503854a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 11/22/2014] [Indexed: 05/30/2023]
Abstract
Ribonuclease A (RNase A) is a small globular enzyme that lyses RNA. The remarkable solution stability of its structure and enzymatic activity has led to its investigation to develop a new class of drugs for cancer chemotherapeutics. However, the successful clinical application of RNase A has been reported to be limited by insufficient stability and loss of enzymatic activity when it was coupled with a biomaterial carrier for drug delivery. The objective of this study was to characterize the structural stability and enzymatic activity of RNase A when it was adsorbed on different surface chemistries (represented by fused silica glass, high-density polyethylene, and poly(methyl-methacrylate)). Changes in protein structure were measured by circular dichroism, amino acid labeling with mass spectrometry, and in vitro assays of its enzymatic activity. Our results indicated that the process of adsorption caused RNase A to undergo a substantial degree of unfolding with significant differences in its adsorbed structure on each material surface. Adsorption caused RNase A to lose about 60% of its native-state enzymatic activity independent of the material on which it was adsorbed. These results indicate that the native-state structure of RNase A is greatly altered when it is adsorbed on a wide range of surface chemistries, especially at the catalytic site. Therefore, drug delivery systems must focus on retaining the native structure of RNase A in order to maintain a high level of enzymatic activity for applications such as antitumor chemotherapy.
Collapse
Affiliation(s)
- Yang Wei
- Department
of Bioengineering, Clemson University, 501 Rhodes Engineering Research
Center, Clemson, South Carolina 29634, United States
| | - Aby A. Thyparambil
- Department
of Bioengineering, Clemson University, 501 Rhodes Engineering Research
Center, Clemson, South Carolina 29634, United States
| | - Yonnie Wu
- Department
of Chemistry and Biochemistry, Auburn University, 172 Chemistry Building, Auburn, Alabama 36849, United States
| | - Robert A. Latour
- Department
of Bioengineering, Clemson University, 501 Rhodes Engineering Research
Center, Clemson, South Carolina 29634, United States
| |
Collapse
|
7
|
Reversible protection of Cys-93(β) by PEG alters the structural and functional properties of the PEGylated hemoglobin. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2014; 1844:1201-7. [DOI: 10.1016/j.bbapap.2014.04.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Revised: 04/02/2014] [Accepted: 04/07/2014] [Indexed: 11/24/2022]
|
8
|
Wang Q, Hu T, Sun L, Ji S, Zhao D, Liu J, Ma G, Su Z. CO binding improves the structural, functional, physical and anti-oxidation properties of the PEGylated hemoglobin. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2014; 43:18-25. [DOI: 10.3109/21691401.2014.885444] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
|
9
|
N-terminal mono-PEGylation of growth hormone antagonist: Correlation of PEG size and pharmacodynamic behavior. Int J Pharm 2013; 453:533-40. [DOI: 10.1016/j.ijpharm.2013.06.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2012] [Revised: 05/05/2013] [Accepted: 06/12/2013] [Indexed: 12/16/2022]
|
10
|
Xue X, Li D, Yu J, Ma G, Su Z, Hu T. Phenyl Linker-Induced Dense PEG Conformation Improves the Efficacy of C-Terminally MonoPEGylated Staphylokinase. Biomacromolecules 2013; 14:331-41. [DOI: 10.1021/bm301511w] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Xiaoying Xue
- National Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100190, China
| | - Dongxia Li
- National Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Jingkai Yu
- National Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Guanghui Ma
- National Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Zhiguo Su
- National Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Tao Hu
- National Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| |
Collapse
|