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Huysamen A, Fadeyi OE, Mayuni G, Dogbey DM, Mungra N, Biteghe FAN, Hardcastle N, Ramamurthy D, Akinrinmade OA, Naran K, Cooper S, Lang D, Richter W, Hunter R, Barth S. Click Chemistry-Generated Auristatin F-Linker-Benzylguanine for a SNAP-Tag-Based Recombinant Antibody-Drug Conjugate Demonstrating Selective Cytotoxicity toward EGFR-Overexpressing Tumor Cells. ACS OMEGA 2023; 8:4026-4037. [PMID: 36743041 PMCID: PMC9893251 DOI: 10.1021/acsomega.2c06844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 01/03/2023] [Indexed: 06/18/2023]
Abstract
Antibody-drug conjugates (ADCs) are bifunctional molecules combining the targeting potential of monoclonal antibodies with the cancer-killing ability of cytotoxic drugs. This simple yet intelligently designed system directly addresses the lack of specificity encountered with conventional anti-cancer treatment regimes. However, despite their initial success, the generation of clinically sustainable and effective ADCs has been plagued by poor tumor penetration, undefined chemical linkages, unpredictable pharmacokinetic profiles, and heterogeneous mixtures of products. To this end, we generated a SNAP-tag-based fusion protein targeting the epidermal growth factor receptor (EGFR)-a biomarker of aggressive and drug-resistant cancers. Here, we demonstrate the use of a novel click coupling strategy to engineer a benzylguanine (BG)-linker-auristatin F (AuriF) piece that can be covalently tethered to the EGFR-targeting SNAP-tag-based fusion protein in an irreversible 1:1 stoichiometric reaction to form a homogeneous product. Furthermore, using these recombinant ADCs to target EGFR-overexpressing tumor cells, we provide a proof-of-principle for generating biologically active antimitotic therapeutic proteins capable of inducing cell death in a dose-dependent manner, thus alleviating some of the challenges of early ADC development.
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Affiliation(s)
- Allan
M. Huysamen
- Department
of Chemistry, University of Cape Town, PD Hahn Building, Cape Town 7700, South Africa
| | - Olaolu E. Fadeyi
- Department
of Chemistry, University of Cape Town, PD Hahn Building, Cape Town 7700, South Africa
| | - Grace Mayuni
- Medical
Biotechnology and Immunotherapy Research Unit, Institute of Infectious
Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town 7700, South Africa
| | - Dennis M. Dogbey
- Medical
Biotechnology and Immunotherapy Research Unit, Institute of Infectious
Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town 7700, South Africa
| | - Neelakshi Mungra
- Medical
Biotechnology and Immunotherapy Research Unit, Institute of Infectious
Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town 7700, South Africa
- Centre
for Immunity and Immunotherapies, Seattle
Children’s Research Institute, Seattle, Washington 98101, United States
| | - Fleury A. N. Biteghe
- Department
of Radiation Oncology and Biomedical Sciences, Cedars-Sinai Medical, Los Angeles, California 90048, United States
| | - Natasha Hardcastle
- Medical
Biotechnology and Immunotherapy Research Unit, Institute of Infectious
Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town 7700, South Africa
| | - Dharanidharan Ramamurthy
- Medical
Biotechnology and Immunotherapy Research Unit, Institute of Infectious
Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town 7700, South Africa
| | - Olusiji A. Akinrinmade
- Medical
Biotechnology and Immunotherapy Research Unit, Institute of Infectious
Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town 7700, South Africa
- Department
of Molecular Pharmacology, Albert Einstein
College of Medicine, Bronx, New York 10461, United States
| | - Krupa Naran
- Medical
Biotechnology and Immunotherapy Research Unit, Institute of Infectious
Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town 7700, South Africa
| | - Susan Cooper
- Division
of Physiological Sciences, Department of Human Biology, University of Cape Town, Cape Town 7700, South Africa
| | - Dirk Lang
- Division
of Physiological Sciences, Department of Human Biology, University of Cape Town, Cape Town 7700, South Africa
| | | | - Roger Hunter
- Department
of Chemistry, University of Cape Town, PD Hahn Building, Cape Town 7700, South Africa
| | - Stefan Barth
- Medical
Biotechnology and Immunotherapy Research Unit, Institute of Infectious
Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town 7700, South Africa
- South
African Research Chair in Cancer Biotechnology, Department of Integrative
Biomedical Sciences, Faculty of Health Sciences, University of Cape Town, Cape
Town 7700, South Africa
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Insight into the Prospects for Tumor Therapy Based on Photodynamic Immunotherapy. Pharmaceuticals (Basel) 2022; 15:ph15111359. [DOI: 10.3390/ph15111359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 10/30/2022] [Accepted: 11/03/2022] [Indexed: 11/09/2022] Open
Abstract
Malignancy is one of the common diseases with high mortality worldwide and the most important obstacle to improving the overall life expectancy of the population in the 21st century. Currently, single or combined treatments, including surgery, chemotherapy, and radiotherapy, are still the mainstream regimens for tumor treatment, but they all present significant side effects on normal tissues and organs, such as organ hypofunction, energy metabolism disorders, and various concurrent diseases. Based on this, theranostic measures for the highly selective killing of tumor cells have always been a hot area in cancer-related fields, among which photodynamic therapy (PDT) is expected to be an ideal candidate for practical clinical application due to its precise targeting and excellent safety performance, so-called PDT refers to a therapeutic method mainly composed of photosensitizers (PSs), laser light, and reactive oxygen species (ROS). Photoimmunotherapy (PIT), a combination of PDT and immunotherapy, can induce systemic antitumor immune responses and inhibit continuing growth and distant metastasis of residual tumor cells, demonstrating a promising application prospect. This article reviews the types of immune responses that occur in the host after PDT treatment, including innate and adaptive immunity. To further help PIT-related drugs improve their pharmacokinetic properties and bioavailability, we highlight the potential improvement of photodynamic immunotherapy from three aspects: immunostimulatory agents, tumor-associated antigens (TAAs) as well as different immune cells. Finally, we focus on recent advances in various strategies and shed light on their corresponding mechanisms of immune activation and possible clinical applications such as cancer vaccines. Having discovered the inherent potential of PDT and the mechanisms that PDT triggers host immune responses, a variety of immunotherapeutic strategies have been investigated in parallel with approaches to improve PDT efficiency. However, it remains to be further elucidated under what conditions the immune effect induced by PDT can achieve tumor immunosuppression and to what extent PDT-induced antitumor immunity will lead to complete tumor rejection. Currently, PIT presents several outstanding intractable challenges, such as the aggregation ability of PSs locally in tumors, deep tissue penetration ability of laser light, immune escape, and biological toxicity, and it is hoped that these issues raised will help to point out the direction of preclinical research on PIT and accelerate its transition to clinical practice.
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