1
|
Fischer P, Merkel OM, Siedlar M, Huelsmeyer M. Development of a high throughput oxidation profiling strategy for monoclonal antibody products. Eur J Pharm Biopharm 2024; 199:114301. [PMID: 38677563 DOI: 10.1016/j.ejpb.2024.114301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 04/17/2024] [Accepted: 04/19/2024] [Indexed: 04/29/2024]
Abstract
Oxidation is one of the most common degradation pathways of biopharmaceutics, potentially leading to altered product stability, pharmacokinetics, reduced biological activity and/or an increased immunogenicity. However, it is often insufficiently assessed in early development stages, leaving potential molecule liabilities undiscovered. Aim of the present work was the development of a high throughput oxidation profiling strategy, applicable throughout various stages of biopharmaceutical development. The study demonstrates that the combination of multiple stress assays, including peroxide-based, visible light, and metal-catalyzed oxidation (MCO), enables a comprehensive understanding of a mAb's oxidation susceptibility. The most effective parameters to evaluate oxidation in a high-throughput screening workflow are aggregation, tryptophan oxidation and changes in the hydrophobicity profile of the Fc and Fab subunit measured via Size Exclusion Chromatography, Intrinsic Tryptophan Fluorescence Spectroscopy and Reversed-Phase Chromatography subunit analysis, respectively. This oxidation profiling approach is valuable tool to systematically characterize the oxidation susceptibility under relevant conditions, time effective and with minimal sample consumption.
Collapse
Affiliation(s)
- Paulina Fischer
- AbbVie Deutschland GmbH und Co. KG, Drug Product Development, Knollstraße, Ludwigshafen am Rhein, Germany.
| | - Olivia M Merkel
- Ludwig-Maximilians-Universität München, Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Munich, Germany
| | - Michael Siedlar
- AbbVie Deutschland GmbH und Co. KG, Drug Product Development, Knollstraße, Ludwigshafen am Rhein, Germany
| | - Martin Huelsmeyer
- AbbVie Deutschland GmbH und Co. KG, Drug Product Development, Knollstraße, Ludwigshafen am Rhein, Germany
| |
Collapse
|
2
|
Wang Y, Zhao Y, He Y, Ao C, Jiang Y, Tian Y, Zhao H, Lu H. Effect of three unsaturated fatty acids on the protein oxidation and structure of myofibrillar proteins from rainbow trout (Oncorhynchus mykiss). Food Chem 2024; 451:139403. [PMID: 38653104 DOI: 10.1016/j.foodchem.2024.139403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Revised: 04/10/2024] [Accepted: 04/15/2024] [Indexed: 04/25/2024]
Abstract
In this study, the impact of three unsaturated fatty acids (Oleic acid: OA, Eicosapentaenoic acid: EPA, Docosahexaenoic acid: DHA) on the oxidation and structure of rainbow trout myofibrillar protein (MP) was explored. The findings revealed a notable increase in carbonyl content (P < 0.05) and a significant decrease in total sulfhydryl content (P < 0.05) of MP with the concentration increase of the three unsaturated fatty acids. Endogenous fluorescence spectroscopy and surface hydrophobicity analyses showed that unsaturated fatty acids can cause unfolding and exposure of hydrophobic groups in MP. In addition, SDS-PAGE showed that disulfide bonds were associated with MP cross-linking and aggregate size induced by unsaturated fatty acids. Overall, three unsaturated fatty acid treatments facilitated the oxidation of myofibrillar proteins, and the extent of protein oxidation was closely associated with the concentration of unsaturated fatty acids.
Collapse
Affiliation(s)
- Youjun Wang
- College of Food Science and Engineering, Dalian Ocean University, Heishijiao Street, Dalian 116023, China
| | - Yangmeijin Zhao
- College of Food Science and Engineering, Dalian Ocean University, Heishijiao Street, Dalian 116023, China
| | - Yuxuan He
- College of Food Science and Engineering, Dalian Ocean University, Heishijiao Street, Dalian 116023, China
| | - Chengxiang Ao
- College of Food Science and Engineering, Dalian Ocean University, Heishijiao Street, Dalian 116023, China
| | - Yusheng Jiang
- Key Laboratory of Dalian Shrimp and Crab Breeding and Healthy Aquaculture, Heishijiao Street, Dalian 116023, China
| | - Yuanyong Tian
- College of Food Science and Engineering, Dalian Ocean University, Heishijiao Street, Dalian 116023, China; Collaborative Innovation Center of Seafood Deep Processing, Qinggongyuan Street, Dalian Polytechnic University, Dalian 116034, China
| | - Hui Zhao
- College of Food Science and Engineering, Dalian Ocean University, Heishijiao Street, Dalian 116023, China; Collaborative Innovation Center of Seafood Deep Processing, Qinggongyuan Street, Dalian Polytechnic University, Dalian 116034, China
| | - Hang Lu
- College of Food Science and Engineering, Dalian Ocean University, Heishijiao Street, Dalian 116023, China; Collaborative Innovation Center of Seafood Deep Processing, Qinggongyuan Street, Dalian Polytechnic University, Dalian 116034, China.
| |
Collapse
|
3
|
González-Vega RI, Robles-García MÁ, Mendoza-Urizabel LY, Cárdenas-Enríquez KN, Ruiz-Cruz S, Gutiérrez-Lomelí M, Iturralde-García RD, Avila-Novoa MG, Villalpando-Vargas FV, Del-Toro-Sánchez CL. Impact of the ABO and RhD Blood Groups on the Evaluation of the Erythroprotective Potential of Fucoxanthin, β-Carotene, Gallic Acid, Quercetin and Ascorbic Acid as Therapeutic Agents against Oxidative Stress. Antioxidants (Basel) 2023; 12:2092. [PMID: 38136212 PMCID: PMC10740450 DOI: 10.3390/antiox12122092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 11/26/2023] [Accepted: 12/01/2023] [Indexed: 12/24/2023] Open
Abstract
Previous studies detail that different blood groups are associated with incidence of oxidative stress-related diseases such as certain carcinomas. Bioactive compounds represent an alternative for preventing this oxidative stress. The aim of this study was to elucidate the impact of blood groups on the erythroprotective potential of fucoxanthin, β-Carotene, gallic acid, quercetin and ascorbic acid as therapeutic agents against oxidative stress. The impact of ABO blood groups on the erythroprotective potential was evaluated via the antioxidant capacity, blood biocompatibility, blood susceptibility and erythroprotective potential (membrane stabilization, in vitro photostability and antihemolytic activity). All tested antioxidants exhibited a high antioxidant capacity and presented the ability to inhibit ROO•-induced oxidative stress without compromising the cell membrane, providing erythroprotective effects dependent on the blood group, effects that increased in the presence of antigen A. These results are very important, since it has been documented that antigen A is associated with breast and skin cancer. These results revealed a probable relationship between different erythrocyte antigens with erythroprotective potential, highlighting the importance of bio-targeted drugs for groups most susceptible to certain chronic-degenerative pathologies. These compounds could be applied as additive, nutraceutical or encapsulated to improve their bioaccessibility.
Collapse
Affiliation(s)
- Ricardo Iván González-Vega
- Department of Medical and Life Sciences, Cienega University Center (CUCIÉNEGA), Universidad de Guadalajara, Av. Universidad 1115, Lindavista, Ocotlán 47820, Jalisco, Mexico; (R.I.G.-V.); (M.G.-L.); (M.G.A.-N.)
- Department of Cellular and Molecular Biology, University Center for Biological and Agricultural Sciences (CUCBA), Universidad de Guadalajara, Periférico Norte N° 799 Núcleo Universitario, C. Prol. Belenes, Zapopan 45100, Jalisco, Mexico;
| | - Miguel Ángel Robles-García
- Department of Medical and Life Sciences, Cienega University Center (CUCIÉNEGA), Universidad de Guadalajara, Av. Universidad 1115, Lindavista, Ocotlán 47820, Jalisco, Mexico; (R.I.G.-V.); (M.G.-L.); (M.G.A.-N.)
| | - Litzy Yadira Mendoza-Urizabel
- Department of Research and Postgraduate in Food, Universidad de Sonora, Blvd Luis Encinas y Rosales S/N, Col. Centro, Hermosillo 83000, Sonora, Mexico; (L.Y.M.-U.); (K.N.C.-E.); (S.R.-C.); (R.D.I.-G.)
| | - Kelly Nabil Cárdenas-Enríquez
- Department of Research and Postgraduate in Food, Universidad de Sonora, Blvd Luis Encinas y Rosales S/N, Col. Centro, Hermosillo 83000, Sonora, Mexico; (L.Y.M.-U.); (K.N.C.-E.); (S.R.-C.); (R.D.I.-G.)
| | - Saúl Ruiz-Cruz
- Department of Research and Postgraduate in Food, Universidad de Sonora, Blvd Luis Encinas y Rosales S/N, Col. Centro, Hermosillo 83000, Sonora, Mexico; (L.Y.M.-U.); (K.N.C.-E.); (S.R.-C.); (R.D.I.-G.)
| | - Melesio Gutiérrez-Lomelí
- Department of Medical and Life Sciences, Cienega University Center (CUCIÉNEGA), Universidad de Guadalajara, Av. Universidad 1115, Lindavista, Ocotlán 47820, Jalisco, Mexico; (R.I.G.-V.); (M.G.-L.); (M.G.A.-N.)
| | - Rey David Iturralde-García
- Department of Research and Postgraduate in Food, Universidad de Sonora, Blvd Luis Encinas y Rosales S/N, Col. Centro, Hermosillo 83000, Sonora, Mexico; (L.Y.M.-U.); (K.N.C.-E.); (S.R.-C.); (R.D.I.-G.)
| | - María Guadalupe Avila-Novoa
- Department of Medical and Life Sciences, Cienega University Center (CUCIÉNEGA), Universidad de Guadalajara, Av. Universidad 1115, Lindavista, Ocotlán 47820, Jalisco, Mexico; (R.I.G.-V.); (M.G.-L.); (M.G.A.-N.)
| | - Fridha Viridiana Villalpando-Vargas
- Department of Cellular and Molecular Biology, University Center for Biological and Agricultural Sciences (CUCBA), Universidad de Guadalajara, Periférico Norte N° 799 Núcleo Universitario, C. Prol. Belenes, Zapopan 45100, Jalisco, Mexico;
- Department of Health Sciences, University Center of the Valleys (CUVALLE), Universidad de Guadalajara, Carr. a Guadalajara Km. 45.5, Ameca 46600, Jalisco, Mexico
| | - Carmen Lizette Del-Toro-Sánchez
- Department of Research and Postgraduate in Food, Universidad de Sonora, Blvd Luis Encinas y Rosales S/N, Col. Centro, Hermosillo 83000, Sonora, Mexico; (L.Y.M.-U.); (K.N.C.-E.); (S.R.-C.); (R.D.I.-G.)
| |
Collapse
|
4
|
Zhu X, Zhang J, Zhang X, Dai Q, Fu Q. Effects of 2,2'-Azobis(2-methylpropionamidine) Dihydrochloride Stress on the Gel Properties of Duck Myofibrillar Protein Isolate. Molecules 2023; 28:6721. [PMID: 37764497 PMCID: PMC10535395 DOI: 10.3390/molecules28186721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 09/08/2023] [Accepted: 09/18/2023] [Indexed: 09/29/2023] Open
Abstract
The aim of this study was to investigate the biochemical properties and gel-forming capacity of duck myofibrillar proteins under the effects of 2,2'-azobis(2-methylpropionamidine) dihydrochloride (AAPH)-mediated oxidation. Duck myofibrillar proteins were extracted and treated with different concentrations of AAPH solutions (0, 1, 3, 5, 10 mmol/L) and then analysed for carbonyl content, dynamic rheology, protein profiles and gel-forming properties (colour, water holding capacity, gel strength and microstructure). The results showed that with increasing AAPH concentration, the carbonyl content of the proteins exhibited an increasing trend (p < 0.05); SDS-PAGE pattern changes indicated that moderate oxidation (3 mmol/L AAPH) induced myosin aggregation via covalent bonds including disulfide, enhanced protein-protein interactions, and thus affected the gel strength of the DMPs' heat-induced gels. However, high oxidation (5 and 10 mmol/L AAPH) led to the partial degradation of the myosin heavy chain (MHC) isoforms, as evidenced by lower storage modulus and irregular microstructures, which significantly reduced gelation ability. These results suggest that the internal relationship between alkylperoxyl radical-induced oxidation should be taken into account in the processing of duck meat, as mild protein oxidation is conducive to improving gel quality.
Collapse
Affiliation(s)
- Xueshen Zhu
- Key Laboratory of Biological Functional Molecules of Jiangsu Province, College of Life Science and Chemistry, Jiangsu Second Normal University, Nanjing 211200, China; (J.Z.); (X.Z.); (Q.D.)
| | - Jin Zhang
- Key Laboratory of Biological Functional Molecules of Jiangsu Province, College of Life Science and Chemistry, Jiangsu Second Normal University, Nanjing 211200, China; (J.Z.); (X.Z.); (Q.D.)
| | - Xinyu Zhang
- Key Laboratory of Biological Functional Molecules of Jiangsu Province, College of Life Science and Chemistry, Jiangsu Second Normal University, Nanjing 211200, China; (J.Z.); (X.Z.); (Q.D.)
| | - Qun Dai
- Key Laboratory of Biological Functional Molecules of Jiangsu Province, College of Life Science and Chemistry, Jiangsu Second Normal University, Nanjing 211200, China; (J.Z.); (X.Z.); (Q.D.)
| | - Qingquan Fu
- School of Food Science, Nanjing Xiaozhuang University, Nanjing 211171, China
| |
Collapse
|
5
|
Liu F, Zheng Y, Hong H, Liu L, Chen X, Xia Q. Identification of Efficacy-Associated Markers to Discriminate Flos Chrysanthemum and Flos Chrysanthemi Indici Based on Fingerprint-Activity Relationship Modeling: A Combined Evaluation over Chemical Consistence and Quality Consistence. Molecules 2023; 28:6254. [PMID: 37687083 PMCID: PMC10488643 DOI: 10.3390/molecules28176254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Revised: 08/22/2023] [Accepted: 08/24/2023] [Indexed: 09/10/2023] Open
Abstract
Monitoring the quality consistency of traditional Chinese medicines, or herbal medicines (HMs), is the basis of assuring the efficacy and safety of HMs during clinical applications. The purpose of this work was to characterize the difference in hydrophilic antioxidants and related bioactivities between Flos Chrysanthemum (JH) and its wild relatives (Chrysanthemum indicum L.; YJH) based on the establishment of fingerprint-efficacy relationship modeling. The concentrations of the total phenolics and flavonoids of JH samples were shown to be generally higher than those of YJH, but the concentration distribution ranges of YJH were significantly greater compared to JH samples, possibly related to environmental stress factors leading to the concentration fluctuations of phytochemicals during the growth and flowering of Chrysanthemum cultivars. Correspondingly, the total antioxidant capabilities of JH were greatly higher than those of YJH samples, as revealed by chemical assays, including DPPH and ABTS radical scavenging activities and FRAP assays. In addition, cellular-based antioxidant activities confirmed the results of chemical assays, suggesting that the differences in antioxidant activities among the different types of Chrysanthemums were obvious. The extracts from YJH and JH samples showed significant α-glucosidase inhibitory activity and lipase-inhibitory activity, implying the modulatory effects on lipid and glucose metabolisms, which were also confirmed by an untargeted cell-based metabolomics approach. The selected common peaks by similarity analysis contributed to the discrimination of YJH and JH samples, and the modeling of the fingerprint-bioactivity relationship identified neochlorogenic acid, isochlorogenic acid A, and linarin as efficacy-associated chemical markers. These results have demonstrated that integrating HPLC fingerprints and the analysis of similarity indexes coupled with antioxidant activities and enzyme-inhibitory activities provides a rapid and effective approach to monitoring the quality consistency of YJH/JH samples.
Collapse
Affiliation(s)
- Feng Liu
- Department of Horticultural Technology, Ningbo City College of Vocational Technology, Ningbo 315100, China
| | - Yuanrong Zheng
- State Key Laboratory of Dairy Biotechnology, Shanghai Engineering Research Center of Dairy Biotechnology, Dairy Research Institute, Bright Dairy & Food Co., Ltd., Shanghai 200436, China
| | - Huijie Hong
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
| | - Lianliang Liu
- College of Food and Pharmaceutical Sciences, Key Laboratory of Animal Protein Food Processing Technology of Zhejiang Province, Ningbo University, Ningbo 315832, China
| | - Xiaojia Chen
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
| | - Qiang Xia
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
- College of Food and Pharmaceutical Sciences, Key Laboratory of Animal Protein Food Processing Technology of Zhejiang Province, Ningbo University, Ningbo 315832, China
| |
Collapse
|
6
|
Li Y, Si D, Sabier M, Liu J, Si J, Zhang X. Guideline for screening antioxidant against lipid‐peroxidation by spectrophotometer. eFood 2023. [DOI: 10.1002/efd2.80] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023] Open
|
7
|
Shashni B, Tamaoki J, Kobayashi M, Nagasaki Y. Design of a new self-assembling antioxidant nanomedicine to ameliorate oxidative stress in zebrafish embryos. Acta Biomater 2023; 159:367-381. [PMID: 36640953 DOI: 10.1016/j.actbio.2023.01.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 12/21/2022] [Accepted: 01/05/2023] [Indexed: 01/13/2023]
Abstract
Oxidative stress, which is a persistent state of elevated reactive oxygen species (ROS), is implicated in the pathogeneses of several diseases, making antioxidant-based therapeutics the aptest intervention. Nevertheless, the clinical failure of conventional low-molecular-weight (LMW) antioxidants in oxidative stress-related diseases to yield favorable therapeutic outcomes and an increased mortality rate attributable to their poor pharmacokinetic characteristics, necessitates the development of alternative therapeutics. In light of this, we designed and synthesized a new amphiphilic polymer functionalized with a clinically safe base polymer of poly(styrene-co-maleic anhydride) copolymer conjugated with the LMW pleiotropic antioxidant TEMPO (a potent antioxidant) and biocompatible poly(ethylene glycol) (TEMPO-installed PSMA-g-PEG), which self-assembles into nano-sized micelles (SMAPoTN) under physiological conditions. We investigated its safety and antioxidant ability using zebrafish models. Common LMW antioxidants, such as 4-hydroxy-TEMPO (TEMPOL), vitamin C, N-acetyl-L-cysteine, and edaravone exposure induced phenotypic distortions, a manifestation of developmental toxicity, and resulted in high lethality in zebrafish larvae. LMW TEMPOL also adversely affected embryo hatchability, induced arrhythmia and cardiac edema, and failed to protect against oxidative stress. In contrast, exposure of zebrafish embryos to SMAPoTN increased the hatchability, protected embryos against various inducers of oxidative stress, and did not induce any phenotypic alterations or discernible toxicity. Taken together, we conclude that SMAPoTN surpasses LMW TEMPOL in terms of the ability to protect zebrafish, attributable to efficient ROS scavenging without perturbing normal redox homeostasis. These results imply that SMAPoTN can be used as a therapeutic intervention against various oxidative stress-induced diseases. STATEMENT OF SIGNIFICANCE: Failure of low molecular weight (LMW) antioxidants to improve therapeutic index in various oxidative stress-related pathogenesis, attributable to their poor pharmacokinetic characteristics, greatly limits their clinical translation. To overcome this limitation, we developed a self-assembling antioxidant nanoparticle (SMAPoTN) comprised of amphiphilic polymer; poly(styrene-co-maleic anhydride) conjugated with TEMPO as an antioxidant and biocompatible poly(ethylene glycol). Preliminary studies carried out in the in vivo models of zebrafish embryos confirmed that exposure of LMW antioxidant resulted in acute developmental toxicity, high lethality, and failure to rescue embryos against oxidative stress inducers. In contrast, SMAPoTN did not exert discernible toxicity and significantly improved their survival under oxidative stress. Our finding establishes antioxidant nanoparticles as more suitable therapeutic intervention for oxidative stress-induced diseases than LMW antioxidants.
Collapse
Affiliation(s)
- Babita Shashni
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tennoudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
| | - Junya Tamaoki
- Faculty of Medicine, University of Tsukuba, Tennoudai 1-1-1, Tsukuba, Ibaraki 305-8575, Japan
| | - Makoto Kobayashi
- Faculty of Medicine, University of Tsukuba, Tennoudai 1-1-1, Tsukuba, Ibaraki 305-8575, Japan
| | - Yukio Nagasaki
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tennoudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan; Master's Program in Medical Sciences, University of Tsukuba, Tennoudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan; Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, Tennoudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan.
| |
Collapse
|
8
|
Han M, Yang F, Zhang K, Ni J, Zhao X, Chen X, Zhang Z, Wang H, Lu J, Zhang Y. Antioxidant, Anti-Inflammatory and Anti-Diabetic Activities of Tectona grandis Methanolic Extracts, Fractions, and Isolated Compounds. Antioxidants (Basel) 2023; 12:antiox12030664. [PMID: 36978912 PMCID: PMC10044725 DOI: 10.3390/antiox12030664] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 02/23/2023] [Accepted: 03/02/2023] [Indexed: 03/11/2023] Open
Abstract
Tectona grandis is a traditional Dai medicine plant belonging to the Lamiaceae family, which can be used to treat malaria, inflammation, diabetes, liver disease, bronchitis, tumors, cholelithiasis, jaundice, skin disease and as an anti-helminthic. To find more novel therapeutic agents contained in this medicinal plant, the antioxidant, anti-inflammatory and anti-diabetic activities of T. grandis methanolic extract, fractions and compounds were evaluated. In this study, 26 compounds were isolated from the leaves and branches of T. grandis. Their structures were identified based on extensive spectral experiments, including NMR, ESI-MS and comparison with published spectral data. Among them, compounds 1–2, 4–6, 9–14 and 16–22 were reported for the first time for this plant. The antioxidant activity screening results showed that compounds 5, 15 and 23 had potent antioxidant capacities, with SC50 values from 0.32 to 9.92 µmol/L, 0.92 to 1.10 mmol Trolox/L and 1.02 to 1.22 mmol Trolox/L for DPPH, ABTS and FRAP, respectively. In addition, their anti-inflammatory effects were investigated by releasing TNF-α, IL-1β and IL-6 through the use of mouse monocytic macrophages (RAW 264.7). Compounds 1, 13, 18 and 23 had the effects of reducing the expression of inflammatory factors. Compounds 13 and 18 were reported for the first time for their anti-inflammatory activities. Furthermore, the methanolic extract (ME), petroleum ether extract (PEE) and EtOAc extract (EAE) of T. grandis showed significant glucose uptake activities; compounds 21 and 23 significantly promoted glucose uptake of 3T3-L1 adipocytes at 40 µM. Meanwhile, compounds 4, 5 and 7 showed significant inhibitory activities against α-glucosidase, with IC50 values of 14.16 ± 0.34 µmol/L, 19.29 ± 0.26 µmol/L and 3.04 ± 0.08 µmol/L, respectively. Compounds 4 and 5 were reported for the first time for their α-glucosidase inhibitory activities. Our investigation explored the possible therapeutic material basis of T. grandis to prevent oxidative stress and related diseases, especially inflammation and diabetes.
Collapse
Affiliation(s)
- Mei Han
- Key Laboratory of Tropical Plant Resource and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China
- Faculty of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Fengxian Yang
- Key Laboratory of Tropical Plant Resource and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China
| | - Kun Zhang
- Key Laboratory of Tropical Plant Resource and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China
- Faculty of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jiyan Ni
- Key Laboratory of Tropical Plant Resource and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China
- Faculty of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xia Zhao
- Key Laboratory of Tropical Plant Resource and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China
| | - Xuelin Chen
- Key Laboratory of Tropical Plant Resource and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China
- Faculty of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhennan Zhang
- Key Laboratory of Tropical Plant Resource and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China
- Faculty of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hanlei Wang
- Key Laboratory of Tropical Plant Resource and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China
- Faculty of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jing Lu
- Key Laboratory of Tropical Plant Resource and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China
- Faculty of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yumei Zhang
- Key Laboratory of Tropical Plant Resource and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China
- Correspondence: ; Tel.: +86-871-6511-2766
| |
Collapse
|
9
|
Chen X, Li B, Zhao X, Li L, Wang H, Zhang K, Han M, Zhang Y. Kochiae Fructus: Evaluation on the antioxidant properties and oral safety of its water decoction. Toxicon 2022; 219:106934. [DOI: 10.1016/j.toxicon.2022.106934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 09/18/2022] [Accepted: 09/28/2022] [Indexed: 11/20/2022]
|
10
|
Kirley TL, Norman AB, Greis KD. Oxidation of specific tryptophan residues inhibits high affinity binding of cocaine and its metabolites to a humanized anti-cocaine mAb. J Biol Chem 2022. [PMID: 35143837 PMCID: PMC8908252 DOI: 10.1016/j.jbc.2022.101689] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 01/28/2022] [Accepted: 02/03/2022] [Indexed: 11/24/2022] Open
Abstract
Cocaine addiction remains a serious problem lacking an effective pharmacological treatment. Thus, we have developed a high-affinity anti-cocaine monoclonal antibody (mAb), h2E2, for the treatment of cocaine use disorders. We show that selective tryptophan (Trp) oxidation by 2,2′-azobis(2-amidinopropane) dihydrochloride (AAPH) resulted in a loss of high-affinity binding of cocaine to this mAb. The newly developed use of excess methionine (Met) to protect mAb met residues from AAPH oxidation did not substantially attenuate the effects of oxidation on cocaine binding but greatly decreased the modification of met residues in the mAb. Similar large decreases in ligand affinity (5000–10,000-fold) upon oxidation were observed using cocaine and two cocaine metabolites, cocaethylene and benzoylecgonine, which also bind with nanomolar affinity to this h2E2 mAb. The decrease in binding affinity was accompanied by a decrease of approximately 50% in Trp fluorescence, and increases in mAb 310 to 370 nm absorbance were consistent with the presence of oxidized forms of Trp. Finally, mass spectral analysis of peptides derived from control and AAPH-oxidized mAb indicated that excess free met did effectively protect mAb met residues from oxidation, and that AAPH-oxidized mAb heavy-chain Trp33 and light-chain Trp91 residues are important for cocaine binding, consistent with a recently derived h2E2 Fab fragment crystal structure containing bound benzoylecgonine. Thus, protection of the anti-cocaine h2E2 mAb from Trp oxidation prior to its clinical administration is critical for its proposed therapeutic use in the treatment of cocaine use disorders.
Collapse
|
11
|
López-Alarcón C, Fuentes-Lemus E, Figueroa JD, Dorta E, Schöneich C, Davies MJ. Azocompounds as generators of defined radical species: Contributions and challenges for free radical research. Free Radic Biol Med 2020; 160:78-91. [PMID: 32771519 DOI: 10.1016/j.freeradbiomed.2020.06.021] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Accepted: 06/05/2020] [Indexed: 02/08/2023]
Abstract
Peroxyl radicals participate in multiple processes involved in critical changes to cells, tissues, pharmacueticals and foods. Some of these reactions explain their association with degenerative pathologies, including cardiovascular and neurological diseases, as well as cancer development. Azocompounds, and particularly AAPH (2,2'-Azobis(2-methylpropionamidine) dihydrochloride), a cationic water-soluble derivative, have been employed extensively as sources of model peroxyl radicals. A considerable number of studies have reported mechanistic data on the oxidation of biologically-relevant targets, the scavenging activity of foods and natural products, and the reactions with, and responses of, cultured cells. However, despite the (supposed) experimental simplicity of using azocompounds, the chemistry of peroxyl radical production and subsequent reactions is complicated, and not always considered in sufficient depth when analyzing experimental data. The present work discusses the chemical aspects of azocompounds as generators of peroxyl (and other) radicals, together with their contribution to our understanding of biochemistry, pharmaceutical and food chemistry research. The evidence supporting a role for the formation of alkoxyl (RO•) and other radicals during thermal and photochemical decomposition of azocompounds is assessed, together with the potential influence of such species on the reactions under study.
Collapse
Affiliation(s)
- Camilo López-Alarcón
- Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Eduardo Fuentes-Lemus
- Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Juan David Figueroa
- Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Eva Dorta
- Departamento de Producción Vegetal en Zonas Tropicales y Subtropicales, Instituto Canario de Investigaciones Agrarias, Tenerife, Spain
| | - Christian Schöneich
- Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, KS, 66047, USA
| | - Michael J Davies
- Department of Biomedical Sciences, Panum Institute, University of Copenhagen, Denmark
| |
Collapse
|
12
|
Wang L, Oh JY, Hwang J, Ko JY, Jeon YJ, Ryu B. In Vitro and In Vivo Antioxidant Activities of Polysaccharides Isolated from Celluclast-Assisted Extract of an Edible Brown Seaweed, Sargassum fulvellum. Antioxidants (Basel) 2019; 8:antiox8100493. [PMID: 31635214 PMCID: PMC6826471 DOI: 10.3390/antiox8100493] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 10/14/2019] [Accepted: 10/17/2019] [Indexed: 01/01/2023] Open
Abstract
It has been reported that enzymatic digestion of algae could improve the yield and enhance the biological activity compared to water and organic extraction. Our previous research indicated that Celluclast-assisted extract of Sargassum fulvellum (SF) possessed higher carbohydrate content and stronger antioxidant activity compared to water and other enzyme-assisted extracts. In the present study, we evaluated the antioxidant activities of polysaccharides from SF (SFPS) in vitro in Vero cells and in vivo in zebrafish. SFPS was obtained by Celluclast-assisted hydrolysis and ethanol precipitation. Results showed that SFPS contained 74.55 ± 1.26% sulfated polysaccharides and effectively scavenged 1, 1-diphenyl-2-picrylhydrazyl (DPPH), hydroxyl, and alkyl radicals. SFPS significantly and dose-dependently scavenged intracellular reactive oxygen species (ROS) and improved cell viability. Further studies indicated that SFPS reduced apoptotic body formation through downregulation of proapoptotic protein (Bax and cleaved caspase-3) levels and upregulation of antiapoptotic protein (Bcl-xL and PARP) levels in 2,2-azobis(2-amidinopropane) hydrochloride (AAPH)-treated Vero cells. In addition, SFPS showed strong protective effect against AAPH-stimulated oxidative stress in vivo in zebrafish, as demonstrated by the improved survival rate, reduced heart rate, and decrease in ROS, cell death, and lipid peroxidation levels. These results suggest that SFPS possesses strong in vitro and in vivo antioxidant activity and can be a potential ingredient in the pharmaceutical and cosmeceutical industries.
Collapse
Affiliation(s)
- Lei Wang
- Department of Marine Life Sciences, Jeju National University, Jeju Self-Governing Province 63243, Korea.
- Marine Science Institute, Jeju National University, Jeju Self-Governing Province 63333, Korea.
| | - Jae Young Oh
- Department of Marine Life Sciences, Jeju National University, Jeju Self-Governing Province 63243, Korea.
| | - Jin Hwang
- Department of Marine Life Sciences, Jeju National University, Jeju Self-Governing Province 63243, Korea.
| | - Jae Young Ko
- Material Research Team, Amorepacific R&D Unit, Jeju 63243, Korea.
| | - You-Jin Jeon
- Department of Marine Life Sciences, Jeju National University, Jeju Self-Governing Province 63243, Korea.
- Marine Science Institute, Jeju National University, Jeju Self-Governing Province 63333, Korea.
| | - BoMi Ryu
- Department of Marine Life Sciences, Jeju National University, Jeju Self-Governing Province 63243, Korea.
- Marine Science Institute, Jeju National University, Jeju Self-Governing Province 63333, Korea.
| |
Collapse
|
13
|
Barnett GV, Balakrishnan G, Chennamsetty N, Hoffman L, Bongers J, Tao L, Huang Y, Slaney T, Das TK, Leone A, Kar SR. Probing the Tryptophan Environment in Therapeutic Proteins: Implications for Higher Order Structure on Tryptophan Oxidation. J Pharm Sci 2019; 108:1944-1952. [DOI: 10.1016/j.xphs.2018.12.027] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 11/14/2018] [Accepted: 12/13/2018] [Indexed: 01/01/2023]
|
14
|
Heinzl GA, Lai L, Rao VA. Differentiating the Effects of Oxidative Stress Tests on Biopharmaceuticals. Pharm Res 2019; 36. [DOI: 10.1007/s11095-019-2627-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 04/10/2019] [Indexed: 02/05/2023]
|
15
|
Hageman T, Wei H, Kuehne P, Fu J, Ludwig R, Tao L, Leone A, Zocher M, Das TK. Impact of Tryptophan Oxidation in Complementarity-Determining Regions of Two Monoclonal Antibodies on Structure-Function Characterized by Hydrogen-Deuterium Exchange Mass Spectrometry and Surface Plasmon Resonance. Pharm Res 2018; 36:24. [PMID: 30536043 PMCID: PMC6290686 DOI: 10.1007/s11095-018-2545-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 11/18/2018] [Indexed: 12/16/2022]
Abstract
Purpose Tryptophan’s (Trp) unique hydrophobic and structural properties make it an important antigen binding motif when positioned in complementarity-determining regions (CDRs) of monoclonal antibodies (mAbs). Oxidation of Trp residues within the CDR can deleteriously impact antigen binding, particularly if the CDR conformation is altered. The goal of this study was to evaluate the conformational and functional impact of Trp oxidation for two mAb subtypes, which is essential in determining the structure-function relationship and establishing appropriate analytical control strategies during protein therapeutics development. Methods Selective Trp oxidation was induced by 2,2′-Azobis(2-amidinopropane) dihydrochloride (AAPH) treatment in the presence of free methionine (Met). The native and chemically oxidized mAbs were characterized by hydrogen-deuterium exchange mass spectrometry (HDX-MS) for conformational changes and surface plasmon resonance (SPR) for antigen-antibody binding. Results Treatment of mAbs with AAPH selectively oxidized solvent accessible Trp residues. Oxidation of Trp within or in proximity of CDRs increased conformational flexibility in variable domains and disrupted antigen binding. Conclusions Trp oxidation in CDRs can adversely impact mAbs’ conformation and antigen binding. Trp oxidation should be carefully evaluated as part of critical quality attribute assessments. Oxidation susceptible Trp should be closely monitored during process development for mAbs to establish appropriate analytical control for manufacturing of drug substance and drug product. Electronic supplementary material The online version of this article (10.1007/s11095-018-2545-8) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Tyler Hageman
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, KS, USA.,Biologics Development, Bristol-Myers Squibb, 311 Pennington Rocky Hill Road, Pennington, NJ, 08534, USA
| | - Hui Wei
- Biologics Development, Bristol-Myers Squibb, 311 Pennington Rocky Hill Road, Pennington, NJ, 08534, USA.
| | - Patrick Kuehne
- Biologics Development, Bristol-Myers Squibb, 311 Pennington Rocky Hill Road, Pennington, NJ, 08534, USA
| | - Jinmei Fu
- Biologics Development, Bristol-Myers Squibb, 311 Pennington Rocky Hill Road, Pennington, NJ, 08534, USA
| | - Richard Ludwig
- Biologics Development, Bristol-Myers Squibb, 311 Pennington Rocky Hill Road, Pennington, NJ, 08534, USA
| | - Li Tao
- Biologics Development, Bristol-Myers Squibb, 311 Pennington Rocky Hill Road, Pennington, NJ, 08534, USA
| | - Anthony Leone
- Biologics Development, Bristol-Myers Squibb, 311 Pennington Rocky Hill Road, Pennington, NJ, 08534, USA
| | - Marcel Zocher
- Biologics Development, Bristol-Myers Squibb, 311 Pennington Rocky Hill Road, Pennington, NJ, 08534, USA
| | - Tapan K Das
- Biologics Development, Bristol-Myers Squibb, 311 Pennington Rocky Hill Road, Pennington, NJ, 08534, USA
| |
Collapse
|
16
|
Shah DD, Zhang J, Hsieh M, Sundaram S, Maity H, Mallela KM. Effect of Peroxide- Versus Alkoxyl-Induced Chemical Oxidation on the Structure, Stability, Aggregation, and Function of a Therapeutic Monoclonal Antibody. J Pharm Sci 2018; 107:2789-803. [DOI: 10.1016/j.xphs.2018.07.024] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 06/25/2018] [Accepted: 07/24/2018] [Indexed: 11/22/2022]
|
17
|
Sankar K, Hoi KH, Yin Y, Ramachandran P, Andersen N, Hilderbrand A, McDonald P, Spiess C, Zhang Q. Prediction of methionine oxidation risk in monoclonal antibodies using a machine learning method. MAbs 2018; 10:1281-1290. [PMID: 30252602 PMCID: PMC6284603 DOI: 10.1080/19420862.2018.1518887] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2018] [Revised: 08/15/2018] [Accepted: 08/28/2018] [Indexed: 12/22/2022] Open
Abstract
Monoclonal antibodies (mAbs) have become a major class of protein therapeutics that target a spectrum of diseases ranging from cancers to infectious diseases. Similar to any protein molecule, mAbs are susceptible to chemical modifications during the manufacturing process, long-term storage, and in vivo circulation that can impair their potency. One such modification is the oxidation of methionine residues. Chemical modifications that occur in the complementarity-determining regions (CDRs) of mAbs can lead to the abrogation of antigen binding and reduce the drug's potency and efficacy. Thus, it is highly desirable to identify and eliminate any chemically unstable residues in the CDRs during the therapeutic antibody discovery process. To provide increased throughput over experimental methods, we extracted features from the mAbs' sequences, structures, and dynamics, used random forests to identify important features and develop a quantitative and highly predictive in silico methionine oxidation model.
Collapse
Affiliation(s)
- Kannan Sankar
- Department of Antibody Engineering, Genentech, South San Francisco, CA, USA
| | - Kam Hon Hoi
- Department of Antibody Engineering, Genentech, South San Francisco, CA, USA
- Department of Bioinformatics and Computational Biology, Genentech, South San Francisco, CA, USA
| | - Yizhou Yin
- Department of Antibody Engineering, Genentech, South San Francisco, CA, USA
- Institute for Bioscience and Biotechnology Research, Biological Sciences Graduate Program, University of Maryland, Rockville, MD, USA
| | - Prasanna Ramachandran
- Department of Analytical Development and Quality Control, Genentech, South San Francisco, CA, USA
| | - Nisana Andersen
- Department of Analytical Development and Quality Control, Genentech, South San Francisco, CA, USA
| | - Amy Hilderbrand
- Department of Analytical Development and Quality Control, Genentech, South San Francisco, CA, USA
| | - Paul McDonald
- Department of Purification Development and Bioprocess Development, Genentech, South San Francisco, CA, USA
| | - Christoph Spiess
- Department of Antibody Engineering, Genentech, South San Francisco, CA, USA
| | - Qing Zhang
- Department of Antibody Engineering, Genentech, South San Francisco, CA, USA
- Department of Bioinformatics and Computational Biology, Genentech, South San Francisco, CA, USA
| |
Collapse
|
18
|
Dion MZ, Leiske D, Sharma VK, Zuch de Zafra CL, Salisbury CM. Mitigation of Oxidation in Therapeutic Antibody Formulations: a Biochemical Efficacy and Safety Evaluation of N-Acetyl-Tryptophan and L-Methionine. Pharm Res 2018; 35:222. [PMID: 30280329 DOI: 10.1007/s11095-018-2467-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 07/30/2018] [Indexed: 12/15/2022]
Abstract
PURPOSE Biotherapeutics can be susceptible to oxidation during manufacturing and storage. Free L-methionine is known to protect methionine residues in proteins from oxidation. Similarly, free tryptophan and other indole derivatives have been shown to protect tryptophan residues from oxidation. N-acetyl-DL-tryptophan was previously identified as a potentially superior antioxidant to tryptophan as it has a lower oxidation potential and produces less peroxide upon light exposure. This study sought to confirm the antioxidant efficacy and safety of N-acetyl-DL-tryptophan and L-methionine as formulation components for biotherapeutic drugs. METHODS Antibodies were subjected to AAPH and light exposure in the presence of N-acetyl-DL-tryptophan and L-methionine. Oxidation in relevant CDR and Fc residues was quantified by peptide map. In silico, in vitro, and in vivo studies were performed to evaluate the safety of N-acetyl-DL-tryptophan and L-methionine. RESULTS Peptide mapping demonstrated that N-acetyl-DL-tryptophan was effective at protecting tryptophans from AAPH stress, and that the combination of N-acetyl-DL-tryptophan and L-methionine protected both tryptophan and methionine from AAPH stress. The safety assessment suggested an acceptable safety profile for both excipients. CONCLUSIONS N-acetyl-tryptophan and L-methionine effectively reduce the oxidation of susceptible tryptophan and methionine residues in antibodies and are safe for use in parenteral biotherapeutic formulations.
Collapse
Affiliation(s)
- Michelle Z Dion
- Early Stage Pharmaceutical Development, Genentech Inc., 1 DNA Way, South San Francisco, California, 94080, USA
| | - Danielle Leiske
- Early Stage Pharmaceutical Development, Genentech Inc., 1 DNA Way, South San Francisco, California, 94080, USA
- Seattle Genetics, Bothell, Washington, USA
| | - Vikas K Sharma
- Late Stage Pharmaceutical Development, Genentech Inc., 1 DNA Way, South San Francisco, California, 94080, USA
| | - Christina L Zuch de Zafra
- Safety Assessment, Genentech, Inc., 1 DNA Way, South San Francisco, California, 94080, USA.
- Amgen, South San Francisco, California, USA.
| | - Cleo M Salisbury
- Early Stage Pharmaceutical Development, Genentech Inc., 1 DNA Way, South San Francisco, California, 94080, USA.
- Protein Analytical Chemistry, Genentech Inc., 1 DNA Way, South San Francisco, California, 94080, USA.
| |
Collapse
|