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Koivu MKA, Chakroborty D, Airenne TT, Johnson MS, Kurppa KJ, Elenius K. Trans-activating mutations of the pseudokinase ERBB3. Oncogene 2024; 43:2253-2265. [PMID: 38806620 PMCID: PMC11245391 DOI: 10.1038/s41388-024-03070-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 05/15/2024] [Accepted: 05/20/2024] [Indexed: 05/30/2024]
Abstract
Genetic changes in the ERBB family of receptor tyrosine kinases serve as oncogenic driver events and predictive biomarkers for ERBB inhibitor drugs. ERBB3 is a pseudokinase member of the family that, although lacking a fully active kinase domain, is well known for its potent signaling activity as a heterodimeric complex with ERBB2. Previous studies have identified few transforming ERBB3 mutations while the great majority of the hundreds of different somatic ERBB3 variants observed in different cancer types remain of unknown significance. Here, we describe an unbiased functional genetics screen of the transforming potential of thousands of ERBB3 mutations in parallel. The screen based on a previously described iSCREAM (in vitro screen of activating mutations) platform, and addressing ERBB3 pseudokinase signaling in a context of ERBB3/ERBB2 heterodimers, identified 18 hit mutations. Validation experiments in Ba/F3, NIH 3T3, and MCF10A cell backgrounds demonstrated the presence of both previously known and unknown transforming ERBB3 missense mutations functioning either as single variants or in cis as a pairwise combination. Drug sensitivity assays with trastuzumab, pertuzumab and neratinib indicated actionability of the transforming ERBB3 variants.
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Affiliation(s)
- Marika K A Koivu
- Institute of Biomedicine, and Medicity Research Laboratories, University of Turku, Turku, 20520, Finland
- Turku Doctoral Programme of Molecular Medicine, Turku, 20520, Finland
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Turku, 20520, Finland
| | - Deepankar Chakroborty
- Institute of Biomedicine, and Medicity Research Laboratories, University of Turku, Turku, 20520, Finland
- Turku Doctoral Programme of Molecular Medicine, Turku, 20520, Finland
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Turku, 20520, Finland
| | - Tomi T Airenne
- Structural Bioinformatics Laboratory and InFLAMES Research Flagship Center, Biochemistry, Faculty of Science and Engineering, Åbo Akademi University, 20520, Turku, Finland
| | - Mark S Johnson
- Structural Bioinformatics Laboratory and InFLAMES Research Flagship Center, Biochemistry, Faculty of Science and Engineering, Åbo Akademi University, 20520, Turku, Finland
| | - Kari J Kurppa
- Institute of Biomedicine, and Medicity Research Laboratories, University of Turku, Turku, 20520, Finland
| | - Klaus Elenius
- Institute of Biomedicine, and Medicity Research Laboratories, University of Turku, Turku, 20520, Finland.
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Turku, 20520, Finland.
- Department of Oncology, Turku University Hospital, Turku, 20521, Finland.
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Liu YN, Tsai MF, Wu SG, Chang TH, Shih JY. CD44s and CD44v8-10 isoforms confer acquired resistance to osimertinib by activating the ErbB3/STAT3 signaling pathway. Life Sci 2024; 336:122345. [PMID: 38092140 DOI: 10.1016/j.lfs.2023.122345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Revised: 11/24/2023] [Accepted: 12/06/2023] [Indexed: 12/17/2023]
Abstract
AIMS Although epidermal growth factor receptor (EGFR)-mutant lung cancers respond well to osimertinib, acquired resistance to osimertinib eventually develops through EGFR-dependent and EGFR-independent resistance mechanisms. CD44 splicing variants are widely expressed in lung cancer tissues. However, it remains unclear whether specific splicing variants are involved in acquired resistance to osimertinib. MAIN METHODS The real-time PCR was performed to measure the expression levels of total CD44 and specific CD44 splicing variants (CD44s or CD44v). Gene knockdown and restoration were performed to investigate the effects of CD44 splicing variants on osimertinib sensitivity. Activation of the signaling pathway was evaluated using receptor-tyrosine-kinase phosphorylation membrane arrays, co-immunoprecipitation, and western blotting. KEY FINDINGS Clinical analysis demonstrated that the expression level of total CD44 increased in primary cancer cells from lung adenocarcinomas patients after the development of acquired resistance to osimertinib. Furthermore, osimertinib-resistant cells showed elevated levels of either the CD44s variant or CD44v variants. Manipulations of CD44s or CD44v8-10 were performed to investigate their effects on treatment sensitivity to osimertinib. Knockdown of CD44 increased osimertinib-induced cell death in osimertinib-resistant cells. However, restoration of CD44s or CD44v8-10 in CD44-knockdown H1975/AZD-sgCD44 cells induced osimertinib resistance. Mechanically, we showed that ErbB3 interacted with CD44 and was transactivated by CD44, that consequently triggered activation of the ErbB3/STAT3 signaling pathway and led to CD44s- or CD44v8-10-mediated osimertinib resistance. SIGNIFICANCE CD44 is a co-receptor for ErbB3 and triggers activation of the ErbB3 signaling axis, leading to acquired resistance to osimertinib. CD44/ErbB3 signaling may represent a therapeutic target for overcoming osimertinib resistance.
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Affiliation(s)
- Yi-Nan Liu
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Meng-Feng Tsai
- Department of Biomedical Sciences, Da-Yeh University, Changhua, Taiwan
| | - Shang-Gin Wu
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan; Department of Internal Medicine, National Taiwan University Cancer Center, Taipei, Taiwan
| | - Tzu-Hua Chang
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Jin-Yuan Shih
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan; Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan.
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Zhang G, Guan H, Ning YL, Yao K, Tang H, Muhetaer G, Li H, Zhou J. Osimertinib resistance prognostic gene signature: STRIP2 is associated with immune infiltration and tumor progression in lung adenocarcinoma. J Cancer Res Clin Oncol 2023; 149:15573-15588. [PMID: 37648810 DOI: 10.1007/s00432-023-05294-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Accepted: 08/14/2023] [Indexed: 09/01/2023]
Abstract
OBJECTIVE Although the use of osimertinib can significantly improve the survival time of lung adenocarcinoma (LUAD) patients with epithelial growth factor receptor mutation, eventually drug resistance will limit the survival benefit of most patients. This study aimed to develop a novel prognostic predictive signature based on genes associated with osimertinib resistance. METHODS The differentially expressed genes (DEGs) associated with osimertinib resistance in LUAD were screened from Gene Expression Omnibus datasets and The Cancer Genome Atlas datasets. Multivariate cox regression was used to establish a prognostic signature, and then a nomogram was developed to predict the survival probability of LUAD patients. We used ROC curve and DCA curve to evaluate its clinical prediction accuracy and net benefit. In addition, the differentially expressed genes significantly associated with prognosis were selected for immune infiltration analysis and drug sensitivity analysis, and their roles in the progression of lung adenocarcinoma were verified by in vitro experiments. RESULTS Our evaluation results indicated that the new nomogram had higher clinical prediction accuracy and net benefit value than the TN nomogram. Further analysis showed that patients with low STRIP2 expression had a higher level of immune response, and may be more likely to benefit from immune checkpoint inhibitors and conventional antitumor drugs. This may help to select more precise and appropriate therapy for LUAD patients with osimertinib resistance. Furthermore, in vitro experiments showed that STRIP2 promoted the LUAD cells proliferation, migration and invasion. This further demonstrates the importance of this gene signature for prognostic prediction. CONCLUSION We developed a reliable prognostic model based on DEGs associated with osimertinib resistance and screened for biomarker that can predict the immune response in LUAD patients, which may help in the selection of treatment regimens after osimertinib resistance.
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Affiliation(s)
- Guixing Zhang
- Shenzhen Bao'an Chinese Medicine Hospital, Guangzhou University of Chinese Medicine, Shenzhen, China
| | - Huiting Guan
- Shenzhen Bao'an Chinese Medicine Hospital, Guangzhou University of Chinese Medicine, Shenzhen, China
| | - Yi-Le Ning
- Shenzhen Bao'an Chinese Medicine Hospital, Guangzhou University of Chinese Medicine, Shenzhen, China
| | - Kainan Yao
- Shenzhen Bao'an Chinese Medicine Hospital, Guangzhou University of Chinese Medicine, Shenzhen, China
| | - Hao Tang
- Shenzhen Bao'an Chinese Medicine Hospital, Guangzhou University of Chinese Medicine, Shenzhen, China
| | - Gulizeba Muhetaer
- Shenzhen Bao'an Chinese Medicine Hospital, Guangzhou University of Chinese Medicine, Shenzhen, China
| | - Hang Li
- Shenzhen Bao'an Chinese Medicine Hospital, Guangzhou University of Chinese Medicine, Shenzhen, China.
| | - Jihong Zhou
- Shenzhen Bao'an Chinese Medicine Hospital, Guangzhou University of Chinese Medicine, Shenzhen, China.
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Yonesaka K, Hayashi H, Nakamura A, Sato Y, Azuma K, Sakata S, Tachihara M, Ikeda S, Yokoyama T, Ito K, Yano Y, Matsumoto H, Daga H, Hata A, Sakai K, Chiba Y, Nishio K, Yamamoto N, Nakagawa K. Alternating Therapy With Osimertinib and Afatinib Blockades EGFR Secondary Mutation in EGFR-Mutant Lung Cancer: A Single-Arm Phase II Trial. Clin Lung Cancer 2023; 24:519-527.e4. [PMID: 37344331 DOI: 10.1016/j.cllc.2023.05.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 05/28/2023] [Accepted: 05/31/2023] [Indexed: 06/23/2023]
Abstract
BACKGROUND Resistance to epidermal growth factor receptor tyrosine kinase inhibitors (EGFR-TKIs) has limited treatment options for patients with EGFR-mutated non-small-cell lung cancer (NSCLC). Although osimertinib or afatinib alone induced drug-resistant clones with EGFR secondary mutation in a preclinical model, its combination prevented the appearance of these mutations. We investigated alternating-dose therapy of osimertinib and afatinib in patients with EGFR-mutant NSCLC in a single-arm Phase II trial. METHODS Treatment-naïve patients with stage IV NSCLC harboring an activating EGFR mutation were enrolled. Alternating cycles of osimertinib (80 mg/day) followed by afatinib (20 mg/day) were administered every 8 weeks. Genomic analysis was performed using circulating tumor DNA obtained before and after the treatment. RESULTS Among the 46 enrolled patients, the median progression-free survival was 20.2 months. The overall response rate was 69.6%. The median overall survival was not reached. Among the 26 plasma samples obtained after the acquisition of resistance, 3 showed an increased MET gene copy number, and 1 showed BRAF mutation. Meanwhile, no EGFR secondary mutation was detected. CONCLUSION The efficacy of our treatment was not significantly different from osimertinib alone, as reported previously in untreated advanced NSCLC patients with EGFR mutations. Although the sample size was limited, this treatment may prevent the emergence of EGFR secondary mutations that trigger drug resistance. Further studies are warranted to establish the significance of this treatment. CLINICAL TRIAL REGISTRATION jRCTs051180009.
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Affiliation(s)
- Kimio Yonesaka
- Department of Medical Oncology, Kindai University Faculty of Medicine, Osaka-sayama, Japan.
| | - Hidetoshi Hayashi
- Department of Medical Oncology, Kindai University Faculty of Medicine, Osaka-sayama, Japan
| | - Atsushi Nakamura
- Department of Pulmonary Medicine, Sendai Kousei Hospital, Sendai, Japan
| | - Yuki Sato
- Department of Respiratory Medicine, Kobe City Medical Center General Hospital, Kobe, Japan
| | - Koichi Azuma
- Division of Respirology, Neurology, and Rheumatology, Department of Internal Medicine, Kurume University School of Medicine, Kurume, Japan
| | - Shinya Sakata
- Department of Respiratory Medicine, Kumamoto University Hospital, Kumamoto, Japan
| | - Motoko Tachihara
- Division of Respiratory Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Satoshi Ikeda
- Department of Respiratory Medicine, Kanagawa Cardiovascular and Respiratory Center, Yokohama, Japan
| | - Toshihide Yokoyama
- Department of Respiratory Medicine, Kurashiki Central Hospital, Kurashiki, Japan
| | - Kentaro Ito
- Respiratory Center, Matsusaka Municipal Hospital, Matsusaka, Japan
| | - Yukihiro Yano
- Department of Thoracic Oncology, National Hospital Organization, Osaka Toneyama Medical Center, Toyonaka, Japan
| | - Hirotaka Matsumoto
- Department of Respiratory Medicine, Hyogo Prefectural Amagasaki General Medical Center, Amagasaki, Japan
| | - Haruko Daga
- Department of Medical Oncology, Osaka City General Hospital, Osaka, Japan
| | - Akito Hata
- Department of Thoracic Oncology, Kobe Minimally Invasive Cancer Center, Kobe, Japan
| | - Kazuko Sakai
- Department of Genome Biology, Kindai University Faculty of Medicine, Osaka-Sayama, Japan
| | - Yasutaka Chiba
- Clinical Research Center, Kindai University Hospital, Osaka-Sayama, Japan
| | - Kazuto Nishio
- Department of Genome Biology, Kindai University Faculty of Medicine, Osaka-Sayama, Japan
| | | | - Kazuhiko Nakagawa
- Department of Medical Oncology, Kindai University Faculty of Medicine, Osaka-sayama, Japan
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Benhaghnazar RL, Medina-Kauwe L. Adenovirus-Derived Nano-Capsid Platforms for Targeted Delivery and Penetration of Macromolecules into Resistant and Metastatic Tumors. Cancers (Basel) 2023; 15:3240. [PMID: 37370850 PMCID: PMC10296971 DOI: 10.3390/cancers15123240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 05/31/2023] [Accepted: 06/15/2023] [Indexed: 06/29/2023] Open
Abstract
Macromolecular therapeutics such as nucleic acids, peptides, and proteins have the potential to overcome treatment barriers for cancer. For example, nucleic acid or peptide biologics may offer an alternative strategy for attacking otherwise undruggable therapeutic targets such as transcription factors and similar oncologic drivers. Delivery of biological therapeutics into tumor cells requires a robust system of cell penetration to access therapeutic targets within the cell interior. A highly effective means of accomplishing this may be borrowed from cell-penetrating pathogens such as viruses. In particular, the cell entry function of the adenovirus penton base capsid protein has been effective at penetrating tumor cells for the intracellular deposition of macromolecular therapies and membrane-impermeable drugs. Here, we provide an overview describing the evolution of tumor-targeted penton-base-derived nano-capsids as a framework for discussing the requirements for overcoming key barriers to macromolecular delivery. The development and pre-clinical testing of these proteins for therapeutic delivery has begun to also uncover the elusive mechanism underlying the membrane-penetrating function of the penton base. An understanding of this mechanism may unlock the potential for macromolecular therapeutics to be effectively delivered into cancer cells and to provide a treatment option for tumors resisting current clinical therapies.
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Affiliation(s)
| | - Lali Medina-Kauwe
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA;
- Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
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Yonesaka K. HER2-/HER3-Targeting Antibody-Drug Conjugates for Treating Lung and Colorectal Cancers Resistant to EGFR Inhibitors. Cancers (Basel) 2021; 13:1047. [PMID: 33801379 PMCID: PMC7958627 DOI: 10.3390/cancers13051047] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 02/25/2021] [Accepted: 02/26/2021] [Indexed: 12/13/2022] Open
Abstract
Epidermal growth factor receptor (EGFR) is one of the anticancer drug targets for certain malignancies, including nonsmall cell lung cancer (NSCLC), colorectal cancer (CRC), and head and neck squamous cell carcinoma. However, the grave issue of drug resistance through diverse mechanisms persists, including secondary EGFR-mutation and its downstream RAS/RAF mutation. Since the discovery of the role of human epidermal growth factor receptor 2 (HER2) and HER3 in drug resistance, HER2- or HER3-targeting treatment strategies using monoclonal antibodies have been intensively examined and have demonstrated impressive responsiveness and limitations. Finally, an innovative targeted therapy called antibody drug conjugates (ADC) has provided a solution to overcome this resistance. Specifically, a new cleavable linker-payload system enables stable drug delivery to cancer cells, causing selective destruction. HER2-targeting ADC trastuzumab deruxtecan demonstrated promising responsiveness in patients with HER2-positive CRC, in a phase 2 clinical trial (objective response rate = 45.3%). Furthermore, HER3-targeting patritumab deruxtecan, another ADC, exhibited impressive tumor shrinkage in pretreated patients with EGFR-mutated NSCLC, in a phase 1 clinical trial. This manuscript presents an overview of the accumulated evidence on HER2- and HER3-targeting therapy, especially ADCs, and discussion of remaining issues for further improving these treatments in cancers resistant to EGFR inhibitors.
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Affiliation(s)
- Kimio Yonesaka
- Department of Medical Oncology, Kindai University Faculty of Medicine, 377-2 Ohno-Higashi Osaka-Sayamashi, Osaka 589-8511, Japan
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Haikala HM, Jänne PA. Thirty Years of HER3: From Basic Biology to Therapeutic Interventions. Clin Cancer Res 2021; 27:3528-3539. [PMID: 33608318 DOI: 10.1158/1078-0432.ccr-20-4465] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Revised: 01/13/2021] [Accepted: 02/03/2021] [Indexed: 12/12/2022]
Abstract
HER3 is a pseudokinase member of the EGFR family having a role in both tumor progression and drug resistance. Although HER3 was discovered more than 30 years ago, no therapeutic interventions have reached clinical approval to date. Because the evidence of the importance of HER3 is accumulating, increased amounts of preclinical and clinical trials with HER3-targeting agents are emerging. In this review article, we discuss the most recent HER3 biology in tumorigenic events and drug resistance and provide an overview of the current and emerging strategies to target HER3.
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Affiliation(s)
- Heidi M Haikala
- Lowe Center for Thoracic Oncology, Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts
- Harvard Medical School, Boston, Massachusetts
| | - Pasi A Jänne
- Lowe Center for Thoracic Oncology, Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts.
- Harvard Medical School, Boston, Massachusetts
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Del Re M, Cucchiara F, Petrini I, Fogli S, Passaro A, Crucitta S, Attili I, De Marinis F, Chella A, Danesi R. erbB in NSCLC as a molecular target: current evidences and future directions. ESMO Open 2020; 5:e000724. [PMID: 32820012 PMCID: PMC7443272 DOI: 10.1136/esmoopen-2020-000724] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 06/06/2020] [Accepted: 06/08/2020] [Indexed: 12/13/2022] Open
Abstract
A number of treatments have been developed for HER1, 2 and 3-driven non-small cell lung cancer (NSCLC), of which the most successful have been the epidermal growth factor receptor-tyrosine kinase inhibitors in HER1-mutant tumours resulting in highly improved progression-free survival. Human epidermal growth factor (HER)2 and 3-driven tumours represent the minority of NSCLC, and effective therapies in these patients still represent an unmet medical need. The encouraging results seen with anti-HER2 and anti-HER3 monoclonal antibodies need to be validated in larger studies, even if the greatest obstacle is represented by the exiguous number of patients bearing deregulated HER2/3 system and abnormalities of signal transduction pathway. Considering NSCLC tumour heterogeneity, which affects response and resistance to treatment, combined multiparametric approaches, such as liquid biopsy together with radiomics, may provide a better understanding of the tumour dynamics and clonal selection during the treatments.
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Affiliation(s)
- Marzia Del Re
- Clinical and Experimental Medicine, University Hospital of Pisa, Pisa, Italy
| | - Federico Cucchiara
- Clinical and Experimental Medicine, University Hospital of Pisa, Pisa, Italy
| | - Iacopo Petrini
- Translational Research and New Technologies in Medicine, University Hospital of Pisa, Pisa, Italy
| | - Stefano Fogli
- Clinical and Experimental Medicine, University Hospital of Pisa, Pisa, Italy
| | - Antonio Passaro
- Division of Thoracic Oncology, European Institute of Oncology - IRCCS, Milan, Italy
| | - Stefania Crucitta
- Clinical and Experimental Medicine, University Hospital of Pisa, Pisa, Italy
| | - Ilaria Attili
- Division of Thoracic Oncology, European Institute of Oncology - IRCCS, Milan, Italy
| | - Filippo De Marinis
- Division of Thoracic Oncology, European Institute of Oncology - IRCCS, Milan, Italy
| | - Antonio Chella
- Translational Research and New Technologies in Medicine, University Hospital of Pisa, Pisa, Italy
| | - Romano Danesi
- Clinical and Experimental Medicine, University Hospital of Pisa, Pisa, Italy
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朱 磊, 袁 平, 赵 志, 王 鑫, 王 国, 颜 亮. [Bacterial expression of 183-227aa region of HER3 extracellular domain I and preparation and identification of its polyclonal antibodies]. NAN FANG YI KE DA XUE XUE BAO = JOURNAL OF SOUTHERN MEDICAL UNIVERSITY 2020; 40:806-813. [PMID: 32895213 PMCID: PMC7321272 DOI: 10.12122/j.issn.1673-4254.2020.06.06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Indexed: 11/24/2022]
Abstract
OBJECTIVE To prepare the recombinant peptide MVF-HER3 I composed of the 183-227aa peptide segment of human epidermal growth factor receptor 3 (HER3 I) and the measles virus protein 288-302 peptide segment (MVF), and prepare polyclonal antibodies (PcAb) against this recombinant peptide. METHODS The MVF-HER3 I gene was synthesized chemically and subcloned into pET21b or pET32a plasmid containing Thioredoxin (Trx) tag gene. The recombinant plasmids were identified by endonuclease digestion. MVF-HER3 I was expressed in E.coli BL21(DE3) cells under an optimal bacterial expression condition. The fusion protein Trx-MVF-HER3 I was purified using nickel ion affinity chromatography, and the purified protein was digested by enterokinase to remove Trx tag. The digested mixture underwent further nickel ion affinity chromatography to obtain purified MVF-HER3 I. The purified MVF-HER3 I was used to immunize SD rats subcutaneously for preparing anti-MVF-HER3 I PcAb. The titer of PcAb was determined using ELISA. The bindings of anti-MVF-HER3 I PcAb to MVF-HER3 I, native HER3 and MCF7 cells were analyzed using immunoblotting, immunoprecipitation and laser confocal microscopy. The growth inhibition effect of the antibodies on MCF7 cells cultured in the absence or presence of NRG was assessed using sulforhodamine B. RESULTS The recombinant peptide gene could not be expressed alone, but could be efficiently expressed after fusion with Trx gene under optimized conditions. The fusion peptide MVF-HER3 I was successfully prepared from Trx-MVF-HER3 I. The anti-MVF-HER3 I PcAb, with a titer reaching 1: 512 000, specifically bound to MVF-HER3 I, recognized native HER3 and bound to the membrane of MCF7 cells. The obtained PcAb could dose-dependently inhibit the growth of MCF7 cells irrespective of the presence or absence of NRG. CONCLUSIONS We successfully obtained the recombinant peptide MVF-HER3 I and prepared its PcAb, which can facilitate further functional analysis of HER3 signaling pathway.
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Affiliation(s)
- 磊 朱
- 安徽省多糖药物工程技术研究中心,安徽 芜湖 241002Anhui Provincial Engineering Research Center for Polysaccharide Drugs, Wuhu 241002, China
- 皖南医学院药物研发中心,安徽 芜湖 241002Drug Research & Development Center, Wannan Medical College, Wuhu 241002, China
- 活性生物大分子研究安徽省重点实验室,安徽 芜湖 241002Anhui Province Key Laboratory of Active Biological Macromolecules, Wuhu 241002, China
- 皖南医学院药物筛选与评价研究所,安徽 芜湖 241002Research Institute for Pharmaceutical Screening & Evaluation, Wannan Medical College, Wuhu 241002, China
| | - 平川 袁
- 安徽省多糖药物工程技术研究中心,安徽 芜湖 241002Anhui Provincial Engineering Research Center for Polysaccharide Drugs, Wuhu 241002, China
- 皖南医学院药物研发中心,安徽 芜湖 241002Drug Research & Development Center, Wannan Medical College, Wuhu 241002, China
- 活性生物大分子研究安徽省重点实验室,安徽 芜湖 241002Anhui Province Key Laboratory of Active Biological Macromolecules, Wuhu 241002, China
| | - 志刚 赵
- 安徽省多糖药物工程技术研究中心,安徽 芜湖 241002Anhui Provincial Engineering Research Center for Polysaccharide Drugs, Wuhu 241002, China
- 皖南医学院药物研发中心,安徽 芜湖 241002Drug Research & Development Center, Wannan Medical College, Wuhu 241002, China
| | - 鑫 王
- 安徽省多糖药物工程技术研究中心,安徽 芜湖 241002Anhui Provincial Engineering Research Center for Polysaccharide Drugs, Wuhu 241002, China
- 皖南医学院药物研发中心,安徽 芜湖 241002Drug Research & Development Center, Wannan Medical College, Wuhu 241002, China
| | - 国栋 王
- 安徽省多糖药物工程技术研究中心,安徽 芜湖 241002Anhui Provincial Engineering Research Center for Polysaccharide Drugs, Wuhu 241002, China
- 皖南医学院药物研发中心,安徽 芜湖 241002Drug Research & Development Center, Wannan Medical College, Wuhu 241002, China
- 活性生物大分子研究安徽省重点实验室,安徽 芜湖 241002Anhui Province Key Laboratory of Active Biological Macromolecules, Wuhu 241002, China
| | - 亮 颜
- 活性生物大分子研究安徽省重点实验室,安徽 芜湖 241002Anhui Province Key Laboratory of Active Biological Macromolecules, Wuhu 241002, China
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