1
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Borude AS, Deshmukh SR, Tiwari SV, Kumar SH, Thopate SR. Design and synthesis of novel Thiazolo[5,4-b]pyridine derivatives as potent and selective EGFR-TK inhibitors targeting resistance Mutations in non-small cell lung cancer. Eur J Med Chem 2024; 276:116727. [PMID: 39094428 DOI: 10.1016/j.ejmech.2024.116727] [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: 06/04/2024] [Revised: 07/22/2024] [Accepted: 07/28/2024] [Indexed: 08/04/2024]
Abstract
A novel series of substituted thiazolo[5,4-b]pyridine analogues were rationally designed and synthesized via a multi-step synthetic pathway, including Suzuki cross-coupling reaction. The anticancer activity of all forty-five synthesized derivatives was evaluated against HCC827, H1975, and A549 cancer cell lines utilizing the standard MTT assay. A significant number of the thiazolo[5,4-b]pyridine derivatives exhibited potent anticancer activity. Notably, compounds 10b, 10c, 10h, 10i, and 10k emerged as the most promising anticancer agents. The lead compound, N-(3-(6-(2-aminopyrimidin-5-yl)thiazolo[5,4-b]pyridin-2-yl)-2-methylphenyl)-2,5-difluorobenzenesulfonamide (10k), displayed remarkable potency with IC50 values of 0.010 μM, 0.08 μM, and 0.82 μM against the HCC827, NCI-H1975 and A-549 cancer cell lines, respectively, which were comparable to the clinically approved drug Osimertinib. Importantly, the potent derivatives 10b, 10c, 10h, 10i, and 10k exhibited selective cytotoxicity towards cancer cells and showing no toxicity against the normal BEAS-2B cell line at concentrations exceeding 35 μM. Mechanistic studies revealed that the active compound 10k acts as an EGFR-TK autophosphorylation inhibitor in HCC827 cells. Furthermore, apoptosis assays demonstrated that compound 10k induced substantial early apoptosis (31.9 %) and late apoptosis (8.8 %) in cancer cells, in contrast to the control condition exhibiting only 2.0 % early and 1.6 % late apoptosis. Molecular docking simulations of the synthesized compounds revealed that they formed essential hinge interactions and established hydrogen bonding with Cys797, indicating potential target engagement. These findings highlight the potential of the synthesized thiazolo [(Woodburn, 1999; Zigrossi et al., 2022) 5,45,4-b]pyridine derivatives as promising anticancer agents, warranting further investigation for the development of novel targeted therapies against non-small cell lung cancer.
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Affiliation(s)
- Avinash S Borude
- Department of Chemistry, Radhabai Kale Mahila Mahavidyalay, Ahmednagar, Maharashtra, 414001, India
| | - Santosh R Deshmukh
- Department of Chemistry, Ahmednagar College, Ahmednagar, Maharashtra, 414001, India.
| | - Shailee V Tiwari
- Department of Pharmaceutical Chemistry, Shri Ramkrishna Paramhans College of Pharmacy, Hasnapur, Parbhani, Maharashtra, 431401, India
| | - S Hemant Kumar
- thinkMolecular Technologies Pvt. Ltd, Bangalore, 560102, India
| | - Shankar R Thopate
- Department of Chemistry, Radhabai Kale Mahila Mahavidyalay, Ahmednagar, Maharashtra, 414001, India.
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2
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Patil BR, Bhadane KV, Ahmad I, Agrawal YJ, Shimpi AA, Dhangar MS, Patel HM. Exploring the structural activity relationship of the Osimertinib: A covalent inhibitor of double mutant EGFR L858R/T790M tyrosine kinase for the treatment of Non-Small Cell Lung Cancer (NSCLC). Bioorg Med Chem 2024; 109:117796. [PMID: 38879996 DOI: 10.1016/j.bmc.2024.117796] [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: 03/07/2024] [Revised: 05/13/2024] [Accepted: 06/07/2024] [Indexed: 06/18/2024]
Abstract
The USFDA granted regular approval to Osimertinib (AZD9291) on March 2017, for treating individuals with metastatic Non-Small Cell Lung Cancer having EGFR T790M mutation. Clinically, Osimertinib stands at the forefront for the treatment of patients with Non-Small Cell Lung Cancer. Osimertinib forms a covalent bond with the Cys797 residue and predominantly spares binding to WT-EGFR, thereby reducing toxicity and enabling the administration of doses that effectively inhibit T790M. However, a high percentage of patients treated with Osimertinib (AZD9291) developed a tertiary cysteine797 to serine797 (C797S) mutation in the EGFR kinase domain, rendering resistance to it. This comprehensive review sheds light on the chemistry, computational aspects, structural features, and expansive spectrum of biological activities of Osimertinib and its analogues. The in-depth exploration of these facets serves as a valuable resource for medicinal chemists, empowering them to design better Osimertinib analogues. This exhaustive study not only provides insights into improving potency but also emphasizes considerations for mutant selectivity and optimizing pharmacokinetic properties. This review acts as a guiding beacon for the strategic design and development of next-generation Osimertinib analogues.
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Affiliation(s)
- Bhatu R Patil
- Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra 4254, India
| | - Kunal V Bhadane
- Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra 4254, India
| | - Iqrar Ahmad
- Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra 4254, India
| | - Yogesh J Agrawal
- Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra 4254, India
| | - Amit A Shimpi
- Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra 4254, India
| | - Mayur S Dhangar
- Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra 4254, India
| | - Harun M Patel
- Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra 4254, India.
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3
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Kageji H, Momose T, Nagamoto Y, Togashi N, Yasumatsu I, Nishikawa Y, Kihara K, Hiramoto K, Minami M, Kasanuki N, Isoyama T, Naito H. Synthesis, activity, and their relationships of 2,4-diaminonicotinamide derivatives as EGFR inhibitors targeting C797S mutation. Bioorg Med Chem Lett 2024; 98:129575. [PMID: 38065292 DOI: 10.1016/j.bmcl.2023.129575] [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: 10/17/2023] [Revised: 11/23/2023] [Accepted: 12/02/2023] [Indexed: 12/23/2023]
Abstract
The C797S mutation is one of the major factors behind resistance to the third-generation epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors. Herein, we describe the discovery of the 2,4-diaminonicotinamide derivative 5j, which shows potent inhibitory activity against EGFR del19/T790M/C797S and L858R/T790M/C797S. We also report the structure-activity relationship of the 2,4-diaminonicotinamide derivatives and the co-crystal structure of 5j and EGFR del19/T790M/C797S.
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Affiliation(s)
- Hideaki Kageji
- R&D Division, Daiichi Sankyo Co., Ltd., 1-2-58 Hiromachi, Shinagawa-ku, Tokyo 140-8710, Japan.
| | - Takayuki Momose
- R&D Division, Daiichi Sankyo Co., Ltd., 1-2-58 Hiromachi, Shinagawa-ku, Tokyo 140-8710, Japan
| | - Yasuhito Nagamoto
- R&D Division, Daiichi Sankyo Co., Ltd., 1-2-58 Hiromachi, Shinagawa-ku, Tokyo 140-8710, Japan
| | - Noriko Togashi
- R&D Division, Daiichi Sankyo Co., Ltd., 1-2-58 Hiromachi, Shinagawa-ku, Tokyo 140-8710, Japan
| | - Isao Yasumatsu
- Daiichi Sankyo RD Novare Co., Ltd., 1-2-58 Hiromachi, Shinagawa-ku, Tokyo 140-8710, Japan
| | - Yosuke Nishikawa
- Daiichi Sankyo RD Novare Co., Ltd., 1-2-58 Hiromachi, Shinagawa-ku, Tokyo 140-8710, Japan
| | - Kawori Kihara
- Daiichi Sankyo RD Novare Co., Ltd., 1-16-13 Kitakasai, Edogawa-ku, Tokyo 134-8630, Japan
| | - Kumiko Hiramoto
- Daiichi Sankyo RD Novare Co., Ltd., 1-16-13 Kitakasai, Edogawa-ku, Tokyo 134-8630, Japan
| | - Megumi Minami
- Daiichi Sankyo RD Novare Co., Ltd., 1-16-13 Kitakasai, Edogawa-ku, Tokyo 134-8630, Japan
| | - Naomi Kasanuki
- Daiichi Sankyo RD Novare Co., Ltd., 1-16-13 Kitakasai, Edogawa-ku, Tokyo 134-8630, Japan
| | - Takeshi Isoyama
- R&D Division, Daiichi Sankyo Co., Ltd., 1-2-58 Hiromachi, Shinagawa-ku, Tokyo 140-8710, Japan
| | - Hiroyuki Naito
- R&D Division, Daiichi Sankyo Co., Ltd., 1-2-58 Hiromachi, Shinagawa-ku, Tokyo 140-8710, Japan
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4
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Song D, Ding T, Zhai W, Shao L, Guo N, Jiang L, Zhang W, Zhao F, Wang J, Wang J, Ma J, Yan L. Design, synthesis and biological evaluation of small molecule fluorescent probes targeting EGFR for tumor detection and treatment. Analyst 2023; 148:6325-6333. [PMID: 37947047 DOI: 10.1039/d3an01675g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2023]
Abstract
The epidermal growth factor receptor (EGFR) is a tyrosine kinase receptor that plays a crucial role in cell differentiation and tumor progression, and its overexpression is closely associated with the development and metastasis of multiple cancers. The development of a fluorescent probe capable of targeting EGFR while simultaneously integrating diagnostic and therapeutic functions could have a profound impact on the treatment of related cancers. In this study, we developed a series of EGFR-targeting probes that consisted of an environment-sensitive 1,8-naphthalimide fluorophore, a linker unit and a targeting unit (gefitinib), using a coupling strategy. The synthesized probes were first evaluated for their spectroscopic properties and cytotoxicities against different cell lines, which were selected based on their intrinsic EGFR expression levels. Remarkably, among the probes tested, GP1 showed outstanding environmental sensitivity and exhibited a specific response to tumor cells that overexpress EGFR. Furthermore, the representative probe GP1 was evaluated for its EGFR-specific targeting ability in live-cell fluorescence imaging and in vivo xenograft imaging, as well as its in vivo anti-tumor activity. The results showed that the probe GP1 had excellent EGFR-specific targeting ability, exhibited competitive replacement behavior towards the EGFR inhibitor gefitinib, and demonstrated potent anti-tumor effects in a CT-26 tumor-bearing mouse model. Overall, as a turn-on EGFR targeting fluorescent ligand, GP1 holds immense promise as a valuable tool for tumor detection and treatment.
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Affiliation(s)
- Depu Song
- School of Pharmacy, Henan University, N. Jinming Ave., Kaifeng, Henan, 475004, China.
| | - Tengli Ding
- School of Pharmacy, Henan University, N. Jinming Ave., Kaifeng, Henan, 475004, China.
| | - Weibin Zhai
- School of Pharmacy, Henan University, N. Jinming Ave., Kaifeng, Henan, 475004, China.
| | - Lulian Shao
- School of Pharmacy, Henan University, N. Jinming Ave., Kaifeng, Henan, 475004, China.
| | - Ning Guo
- School of Pharmacy, Henan University, N. Jinming Ave., Kaifeng, Henan, 475004, China.
| | - Lei Jiang
- School of Pharmacy, Henan University, N. Jinming Ave., Kaifeng, Henan, 475004, China.
| | - Wei Zhang
- School of Pharmacy, Henan University, N. Jinming Ave., Kaifeng, Henan, 475004, China.
| | - Fenqin Zhao
- School of Pharmacy, Henan University, N. Jinming Ave., Kaifeng, Henan, 475004, China.
| | - Jianhong Wang
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, N. Jinming Ave., Kaifeng, Henan, 475004, China
| | - Junfeng Wang
- Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard medical school, 125 Nushua St, Boston, MA, 02149, USA
| | - Jing Ma
- School of Pharmacy, Henan University, N. Jinming Ave., Kaifeng, Henan, 475004, China.
| | - Lin Yan
- School of Pharmacy, Henan University, N. Jinming Ave., Kaifeng, Henan, 475004, China.
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5
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Ghorab WM, El-Sebaey SA, Ghorab MM. Design, synthesis and Molecular modeling study of certain EGFRinhibitors with a quinazolinone scaffold as anti-hepatocellular carcinoma and Radio-sensitizers. Bioorg Chem 2023; 131:106310. [PMID: 36528923 DOI: 10.1016/j.bioorg.2022.106310] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 11/20/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022]
Abstract
A set of novel N-substituted-2-((4-oxo-3-phenyl-3,4-dihydroquinazolin-2-yl)thio)acetamide 3-16 were designed and synthesized from 2-mercapto-3-phenylquinazolinone 2. The targeted compounds were screened for their cytotoxic activity against the hepatocellular carcinoma cell line HepG-2. Compounds 8, 9, 10, and 11 with IC50 values of 1.11, 4.28, 5.70, and 4.69 µM, respectively, showed 5.7- to 28-fold higher activities than the positive control doxorubicin (IC50 32.02 µM). Furthermore, compounds 8 and 9 were tested for EGFR inhibitory activity and demonstrated IC50 values of 73.23 and 58.26 µM, respectively, when compared to erlotinib's IC50 value of 9.79 µM. The most potent compounds, 8 and 9, were subjected to a single dose of 8 Gy of γ-radiation, and their cytotoxic efficacy was found to increase after irradiation, demonstrating the synergistic effect of γ-irradiation. Molecular docking was adopted for the most active compounds to confirm their mode of action.
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Affiliation(s)
- Walid M Ghorab
- Department of Drug Radiation Research, National Centre for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo 11765, Egypt
| | - Samiha A El-Sebaey
- Department of Pharmaceutical organic Chemistry, Faculty of Pharmacy (Girls), Al-Azhar University, Youssef Abbas Street, Nasr City, Cairo, Egypt
| | - Mostafa M Ghorab
- Department of Drug Radiation Research, National Centre for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo 11765, Egypt.
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6
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Cell Cycle Arrest and Apoptosis-Inducing Ability of Benzimidazole Derivatives: Design, Synthesis, Docking, and Biological Evaluation. Molecules 2022; 27:molecules27206899. [PMID: 36296495 PMCID: PMC9607330 DOI: 10.3390/molecules27206899] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/02/2022] [Accepted: 10/06/2022] [Indexed: 12/02/2022] Open
Abstract
In the current study, new benzimidazole-based 1,3,4-oxadiazole derivatives have been synthesized and characterized by NMR, IR, MS, and elemental analysis. The final compounds were screened for cytotoxicity against MDA-MB-231, SKOV3, and A549 cell lines and EGFR for inhibitory activities. Compounds 10 and 13 were found to be the most active against all the tested cell lines, comparable to doxorubicin, and exhibited significant inhibition on EGFR kinase, with IC50 0.33 and 0.38 μM, respectively, comparable to erlotinib (IC50 0.39 μM). Furthermore, these two compounds effectively suppressed cell cycle progression and induced cell apoptosis in MDA-MB-231, SKOV3, and A549 cell lines. The docking studies revealed that these compounds showed interactions similar to erlotinib at the EGFR site. It can be concluded that the synthesized molecules effectively inhibit EGFR, can arrest the cell cycle, and may trigger apoptosis and therefore, could be used as lead molecules in the development of new anticancer agents targeting EGFR kinase.
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7
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Nofal ZM, Amin KM, Mohamed HS, El-Kerdawy AM, Aly MS, Habib BS, Sarhan AE. Design, synthesis, biological evaluation, and molecular docking of novel quinazolinone EGFR inhibitors as targeted anticancer agents. SYNTHETIC COMMUN 2022. [DOI: 10.1080/00397911.2022.2114373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Affiliation(s)
- Zinab M. Nofal
- The Department of Therapeutic Chemistry, Pharmaceutical and Drug Industries Research Institute, National Research Center, Giza, Egypt
| | - Kamelia M. Amin
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Hanaa S. Mohamed
- The Department of Therapeutic Chemistry, Pharmaceutical and Drug Industries Research Institute, National Research Center, Giza, Egypt
| | - Ahmed M. El-Kerdawy
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Magdy S. Aly
- Genetics Branch, Zoology Department, Faculty of Science, Beni-Suef University, Beni Suef, Egypt
| | - Basma S. Habib
- The Department of Therapeutic Chemistry, Pharmaceutical and Drug Industries Research Institute, National Research Center, Giza, Egypt
| | - Alaadin E. Sarhan
- The Department of Therapeutic Chemistry, Pharmaceutical and Drug Industries Research Institute, National Research Center, Giza, Egypt
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8
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Pathan A, Ahmad I, Girase R, Jagatap V, Patel H. A Laboratory Accident of Acryloyl Chloride, Its Consequences, Treatment, and Safety Measures: An Arduous Lesson to All Researchers. ACS CHEMICAL HEALTH & SAFETY 2022. [DOI: 10.1021/acs.chas.2c00036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Asama Pathan
- Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, District Dhule-425 405, Shirpur, Maharashtra 425405, India
| | - Iqrar Ahmad
- Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, District Dhule-425 405, Shirpur, Maharashtra 425405, India
| | - Rukaiyya Girase
- Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, District Dhule-425 405, Shirpur, Maharashtra 425405, India
| | - Vilas Jagatap
- Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, District Dhule-425 405, Shirpur, Maharashtra 425405, India
| | - Harun Patel
- Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, District Dhule-425 405, Shirpur, Maharashtra 425405, India
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9
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Eno MS, Brubaker JD, Campbell JE, De Savi C, Guzi TJ, Williams BD, Wilson D, Wilson K, Brooijmans N, Kim J, Özen A, Perola E, Hsieh J, Brown V, Fetalvero K, Garner A, Zhang Z, Stevison F, Woessner R, Singh J, Timsit Y, Kinkema C, Medendorp C, Lee C, Albayya F, Zalutskaya A, Schalm S, Dineen TA. Discovery of BLU-945, a Reversible, Potent, and Wild-Type-Sparing Next-Generation EGFR Mutant Inhibitor for Treatment-Resistant Non-Small-Cell Lung Cancer. J Med Chem 2022; 65:9662-9677. [PMID: 35838760 PMCID: PMC9340769 DOI: 10.1021/acs.jmedchem.2c00704] [Citation(s) in RCA: 49] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
![]()
While epidermal growth factor receptor (EGFR) tyrosine
kinase inhibitors
(TKIs) have changed the treatment landscape for EGFR mutant (L858R
and ex19del)-driven non-small-cell lung cancer (NSCLC), most patients
will eventually develop resistance to TKIs. In the case of first-
and second-generation TKIs, up to 60% of patients will develop an
EGFR T790M mutation, while third-generation irreversible TKIs, like
osimertinib, lead to C797S as the primary on-target resistance mutation.
The development of reversible inhibitors of these resistance mutants
is often hampered by poor selectivity against wild-type EGFR, resulting
in potentially dose-limiting toxicities and a sub-optimal profile
for use in combinations. BLU-945 (compound 30) is a potent,
reversible, wild-type-sparing inhibitor of EGFR+/T790M and EGFR+/T790M/C797S
resistance mutants that maintains activity against the sensitizing
mutations, especially L858R. Pre-clinical efficacy and safety studies
supported progression of BLU-945 into clinical studies, and it is
currently in phase 1/2 clinical trials for treatment-resistant EGFR-driven
NSCLC.
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Affiliation(s)
- Meredith S Eno
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Jason D Brubaker
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - John E Campbell
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Chris De Savi
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Timothy J Guzi
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Brett D Williams
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Douglas Wilson
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Kevin Wilson
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Natasja Brooijmans
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Joseph Kim
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Ayşegül Özen
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Emanuele Perola
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - John Hsieh
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Victoria Brown
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Kristina Fetalvero
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Andrew Garner
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Zhuo Zhang
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Faith Stevison
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Rich Woessner
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Jatinder Singh
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Yoav Timsit
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Caitlin Kinkema
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Clare Medendorp
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Christopher Lee
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Faris Albayya
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Alena Zalutskaya
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Stefanie Schalm
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
| | - Thomas A Dineen
- Blueprint Medicines, 45 Sidney Street, Cambridge, Massachusetts 02139, United States
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10
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Hassanin MA, Mustafa M, Abourehab MAS, Hassan HA, Aly OM, Beshr EAM. Design and Synthesis of New Hydantoin Acetanilide Derivatives as Anti-NSCLC Targeting EGFRL858R/T790M Mutations. Pharmaceuticals (Basel) 2022; 15:ph15070857. [PMID: 35890154 PMCID: PMC9317481 DOI: 10.3390/ph15070857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2022] [Revised: 06/22/2022] [Accepted: 06/25/2022] [Indexed: 02/04/2023] Open
Abstract
Epidermal Growth Factor Receptor (EGFR), its wild type and mutations L858R/T790M, is overexpressed in non-small cell lung cancer (NSCLC) patients and is considered an inevitable oncology target. However, while the potential EGFR inhibitors have been represented in the literature, their cellular activity failed to establish broad potency against EGFR and its mutations. This study identifies a new series of EGFRL858R/T790M inhibitors bearing hydantoin acetanilides. Most compounds revealed strong antiproliferative activity in a range of NSCL cancer models (A549, H1975, and PC9), in which 5a and 5f were the most potent. Compounds 5a and 5f possessed potent anticancer activity on H1975 cells with IC50 values of 1.94 and 1.38 µM, respectively, compared to 9.70 µM for erlotinib. Favorably, 5a and 5f showed low activity on WI-38 normal cells. Western blotting and an EGFR kinase assay test proved the significant EGFR inhibitory activity of 5a. Besides, active hydantoin derivative 5a strongly arrested the cell cycle at the sub G1 and S phases and triggered apoptosis in A549 cells. These results imply that 5a could be considered a promising lead compound for additional development as a potential active agent for anticancer therapy.
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Affiliation(s)
- Moamen A. Hassanin
- Department of Medicinal Chemistry, Faculty of Pharmacy, Minia University, Minia 61519, Egypt; (M.A.H.); (H.A.H.); (E.A.M.B.)
| | - Muhamad Mustafa
- Department of Medicinal Chemistry, Faculty of Pharmacy, Deraya University, Minia 61111, Egypt
- Correspondence: or (M.M.); or (O.M.A.); Tel.: +20-1007620894 (M.M.); +20-1065607771 (O.M.A.)
| | - Mohammed A. S. Abourehab
- Department of Pharmaceutics, Faculty of Pharmacy, Umm Al-Qura University, Makkah 21955, Saudi Arabia;
| | - Heba A. Hassan
- Department of Medicinal Chemistry, Faculty of Pharmacy, Minia University, Minia 61519, Egypt; (M.A.H.); (H.A.H.); (E.A.M.B.)
| | - Omar M. Aly
- Department of Medicinal Chemistry, Faculty of Pharmacy, Port Said University, Port Said 42511, Egypt
- Correspondence: or (M.M.); or (O.M.A.); Tel.: +20-1007620894 (M.M.); +20-1065607771 (O.M.A.)
| | - Eman A. M. Beshr
- Department of Medicinal Chemistry, Faculty of Pharmacy, Minia University, Minia 61519, Egypt; (M.A.H.); (H.A.H.); (E.A.M.B.)
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11
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Pawara R, Ahmad I, Nayak D, Belamkar S, Surana S, Kundu CN, Patil C, Patel H. Design and synthesis of the novel, selective WZ4002 analogue as EGFR-L858R/T790M tyrosine kinase inhibitors for targeted drug therapy in non-small-cell lung cancer (NSCLC). J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.132313] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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12
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Haider K, Das S, Joseph A, Yar MS. An appraisal of anticancer activity with structure-activity relationship of quinazoline and quinazolinone analogues through EGFR and VEGFR inhibition: A review. Drug Dev Res 2022; 83:859-890. [PMID: 35297084 DOI: 10.1002/ddr.21925] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 01/29/2022] [Accepted: 02/06/2022] [Indexed: 12/28/2022]
Abstract
Cancer is one of the leading causes of death. Globally a huge number of deaths and new incidences are reported annually. Heterocyclic compounds have been proved to be very effective in the treatment of different types of cancer. Among different heterocyclic scaffolds, quinazoline and quinazolinone core were found versatile and interesting with many biological activities. In the discovery of novel anticancer agents, the Quinazoline core is very effective. The FDA has approved more than 20 drugs as an anticancer bearing quinazoline or quinazolinone core in the last two decades. One prime example is Dacomitinib, which was newly approved for non-small-cell lung carcinoma treatment in 2018. These drugs work by different pathways to prevent the spread of cancer cell progression, including inhibition of different kinases, tubulin, kinesin spindle protein, and so forth. This review presented recent developments of quinazoline/quinazolinone scaffold bearing derivatives as anticancer agents acting as epidermal growth factor receptor (EGFR) vascular endothelial growth factor receptor (VEGFR), and dual EGFR/VEGFR inhibitors.
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Affiliation(s)
- Kashif Haider
- Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, India
| | - Subham Das
- Department of Pharmaceutical Chemistry, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Alex Joseph
- Department of Pharmaceutical Chemistry, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - M Shahar Yar
- Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, India.,Centre for Excellence for Biomaterials Engineering, Faculty of Applied Sciences, AIMST University, Malaysia
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13
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Zhang Y, Wang Q, Li L, Le Y, Liu L, Yang J, Li Y, Bao G, Yan L. Synthesis and preliminary structure-activity relationship study of 3-methylquinazolinone derivatives as EGFR inhibitors with enhanced antiproliferative activities against tumour cells. J Enzyme Inhib Med Chem 2021; 36:1205-1216. [PMID: 34074193 PMCID: PMC8174486 DOI: 10.1080/14756366.2021.1933466] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 05/15/2021] [Accepted: 05/17/2021] [Indexed: 11/24/2022] Open
Abstract
In this paper, a set of 3-methylquniazolinone derivatives were designed, synthesised, and studied the preliminary structure-activity relationship for antiproliferative activities. All target compounds performed significantly inhibitory effects against wild type epidermal growth factor receptor tyrosine kinase (EGFRwt-TK) and tumour cells (A431, A549, MCF-7, and NCI-H1975). In particular, compound 4d 3-fluoro-N-(4-((3-methyl-4-oxo-3,4-dihydroquinazolin-2-yl)methoxy)phenyl)benzamide showed higher antiproliferative activities against all tumour cells than Gefitinib (IC50 of 3.48, 2.55, 0.87 and 6.42 μM, respectively). Furthermore, compound 4d could induce apoptosis of MCF-7 cells and arrest in G2/M phase at the tested concentration. Molecular docking and ADMET studies showed that compound 4d could closely form many hydrogen bonds with EGFRwt-TK. Therefore, compound 4d is potential to develop as novel anti-cancer drug.
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Affiliation(s)
- Yan Zhang
- School of Pharmaceutical Sciences, Guizhou University, Guiyang, China
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, China
- Guizhou Engineering Laboratory for Synthetic Drugs, Guiyang, China
| | - Qin Wang
- School of Pharmaceutical Sciences, Guizhou University, Guiyang, China
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, China
- Guizhou Engineering Laboratory for Synthetic Drugs, Guiyang, China
| | - Luolan Li
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, China
- Shizhen College of Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Yi Le
- School of Pharmaceutical Sciences, Guizhou University, Guiyang, China
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, China
- Guizhou Engineering Laboratory for Synthetic Drugs, Guiyang, China
| | - Li Liu
- School of Pharmaceutical Sciences, Guizhou University, Guiyang, China
- Guizhou Engineering Laboratory for Synthetic Drugs, Guiyang, China
| | - Jing Yang
- School of Pharmaceutical Sciences, Guizhou University, Guiyang, China
| | - Yongliang Li
- Faculty of Light Industry and Chemical Engineering, Guangdong University of Technology, Guangzhou, China
| | - Guochen Bao
- Institute for Biomedical Materials and Devices (IBMD), Faculty of Science, University of Technology Sydney, Sydney, Australia
| | - Longjia Yan
- School of Pharmaceutical Sciences, Guizhou University, Guiyang, China
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, China
- Guizhou Engineering Laboratory for Synthetic Drugs, Guiyang, China
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14
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Emam AM, Dahal A, Singh SS, Tosso RD, Ibrahim SM, El-Sadek M, Jois SD, Enriz RD, Kothayer H. Quinazoline-tethered hydrazone: A versatile scaffold toward dual anti-TB and EGFR inhibition activities in NSCLC. Arch Pharm (Weinheim) 2021; 354:e2100281. [PMID: 34585758 DOI: 10.1002/ardp.202100281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 09/07/2021] [Accepted: 09/08/2021] [Indexed: 11/07/2022]
Abstract
Globally, lung cancer and tuberculosis are considered to be very serious and complex diseases. Evidence suggests that chronic infection with tuberculosis (TB) can often lead to lung tumors; therefore, developing drugs that target both diseases is of great clinical significance. In our study, we designed and synthesized a suite of 14 new quinazolinones (5a-n) and performed biological investigations of these compounds in Mycobacterium tuberculosis (MTB) and cancer cell lines. In addition, we conducted a molecular modeling study to determine the mechanism of action of these compounds at the molecular level. Compounds that showed anticancer activity in the preliminary screening were further evaluated in three cancer cell lines (A549, Calu-3, and BT-474 cells) and characterized in an epidermal growth factor receptor (EGFR) binding assay. Cytotoxicity in noncancerous lung fibroblast cells was also evaluated to obtain safety data. Our theoretical and experimental studies indicated that our compounds showed a mechanism of action similar to that of erlotinib by inhibiting the EGFR tyrosine kinase. In turn, the antituberculosis activity of these compounds would be produced by the inhibition of enoyl-ACP-reductase. From our findings, we were able to identify two potential lead compounds (5i and 5l) with dual activity and elevated safety toward noncancerous lung fibroblast cells. In addition, our data identified three compounds with excellent anti-TB activities (compounds 5i, 5l, and 5n).
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Affiliation(s)
- Aya M Emam
- Department of Medicinal Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Achyut Dahal
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana Monroe, Monroe, Louisiana, USA
| | - Sitanshu S Singh
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana Monroe, Monroe, Louisiana, USA
| | - Rodrigo D Tosso
- Pharmacy Department, Facultad de Química, Bioquímica y Farmacia, IMIBIO-CONICET, Universidad Nacional de San Luis, San Luis, Argentina
| | - Samy M Ibrahim
- Department of Medicinal Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Mohamed El-Sadek
- Department of Medicinal Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Seetharama D Jois
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana Monroe, Monroe, Louisiana, USA
| | - Ricardo D Enriz
- Pharmacy Department, Facultad de Química, Bioquímica y Farmacia, IMIBIO-CONICET, Universidad Nacional de San Luis, San Luis, Argentina
| | - Hend Kothayer
- Department of Medicinal Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
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15
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Novel, selective acrylamide linked quinazolines for the treatment of double mutant EGFR-L858R/T790M Non-Small-Cell lung cancer (NSCLC). Bioorg Chem 2021; 115:105234. [PMID: 34399322 DOI: 10.1016/j.bioorg.2021.105234] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 06/21/2021] [Accepted: 07/29/2021] [Indexed: 01/02/2023]
Abstract
T790M mutation is the most common mechanism of acquired resistance to first-generation epidermal growth factor receptor tyrosine kinase inhibitors (EGFR-TKIs). To overcome this resistance, 4-anilinoquinazoline-based irreversible inhibitors afatinib, dacomitinib has been developed. However, the clinical application of these irreversible inhibitors is limited due to its narrow selectivity against L858R/T790M mutant EGFR. In an attempt to develop potent and selective EGFR T790M inhibitors, we have designed and synthesized two series of novel acrylamide linked quinazolines. Among them, compounds 2i (IC50 0.171 µM) and 11h (IC50 0.159 µM) were identified as potent compounds, which displayed selective and potent anti-proliferative activity on gefitinib-resistant cell line NCI-H1975 as compared to the gefitinib and WZ4002 in cellular assay. Furthermore, a molecular dynamic simulation of 11h was carried out to assess the stability to form a complex with the L858R/T790M EGFR Kinase domain, which demonstrated that complex was stable for the 100 ns and form strong crucial covalent binding contacts with the thiol group of Cys797 residue. Finally, satisfactory in silico pharmacokinetics properties of 2i, 11h and 11i compounds were predicted. The synthesized compounds were also evaluated for in vitro cytotoxic activity/hepatotoxicity against HepG2 cell line through MTT assay. The results revealed that compounds exhibited lower cytotoxicity to HepG2 cells.
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16
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Unadkat V, Rohit S, Parikh P, Sanna V, Singh S. Rational design-aided discovery of novel 1,2,4-oxadiazole derivatives as potential EGFR inhibitors. Bioorg Chem 2021; 114:105124. [PMID: 34328857 DOI: 10.1016/j.bioorg.2021.105124] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 06/17/2021] [Accepted: 06/23/2021] [Indexed: 12/11/2022]
Abstract
A molecular dynamics-based sampling of epidermal growth factor receptor tyrosine kinase (EGFR-TK) was carried out to search for energetically more stable protein, which was then used for molecular docking of a series of 1,2,4-oxadiazole derivatives previously reported from our laboratory. A total of 14 compounds were docked, where compounds 6a and 6b showed better binding to EGFR in silico. Further, physicochemical properties of all the compounds were calculated, which suggested that all the molecules obeyed Lipinski's rule of 5 and had favorable polar surface area and CaCO2 permeability along with the low potential for HERG inhibition. All the compounds were then screened for their ability to produce cytotoxicity in four different cell lines overexpressing EGFR (A549, HCT-116, HEPG2, MCF-7) and one EGFR negative cancer cell line (SW620); at three concentrations: 10, 1, and 0.1 µM. None of the compounds showed activity against SW620, which suggested that the compounds show cytotoxicity through inhibition of EGFR. Compounds that showed promise in this 3-concentration screen were further subjected to multiple dose-response curves to identify the IC50 values for the shortlisted eight compounds. It was encouraging to see 6a and 6b showing the best IC50 values against almost all the cell-lines which further suggests that our design protocol can be applied to optimize this lead (which are currently in the low micromolar range) to design the homologous compounds to achieve the desired potency in the nanomolar range and also to achieve selectivity across a range of kinases.
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Affiliation(s)
- Vishal Unadkat
- Kashiv Biosciences Pvt Ltd, 27-2 & 43 Building Block B Paiki, Mauje Sarkhej, Opp Applewoods Township, Sarkhej, Ahmedabad 382210, Gujarat, India.
| | - Shishir Rohit
- Kashiv Biosciences Pvt Ltd, 27-2 & 43 Building Block B Paiki, Mauje Sarkhej, Opp Applewoods Township, Sarkhej, Ahmedabad 382210, Gujarat, India
| | - Paranjay Parikh
- Piramal Pharma Solutions, Plot 18, PHARMEZ, Matoda, Sarkhej-Bavla NH 8A, Taluka Sanand, Ahmedabad 382213, Gujarat, India
| | - Vinod Sanna
- Piramal Pharma Solutions, Plot 18, PHARMEZ, Matoda, Sarkhej-Bavla NH 8A, Taluka Sanand, Ahmedabad 382213, Gujarat, India
| | - Sanjay Singh
- Division of Biological & Life Sciences (Formerly Institute of Life Sciences), School of Arts & Sciences, Ahmedabad University, Navaragnpura, Ahmedabad 380009, Gujarat, India; National Institute of Animal Biotechnology, Near Gowlidoddy, Extended Q City Road, Gachibowli, Hyderabad 500032, Telangana, India
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17
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Joshi A, Bhojwani H, Wagal O, Begwani K, Joshi U, Sathaye S, Kanchan D. Evaluation of Benzamide-chalcone Derivatives as EGFR/CDK2 inhibitor: Synthesis, in-vitro Inhibition, and Molecular Modeling Studies. Anticancer Agents Med Chem 2021; 22:328-343. [PMID: 33858315 DOI: 10.2174/1871520621666210415091359] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 03/08/2021] [Accepted: 03/14/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND EGFR (Epidermal Growth Factor Receptor) and CDK2 (Cyclin Dependent Kinase 2) are important targets in the treatment of many solid tumors and different ligands of these receptors share many common structural features. OBJECTIVE The study involved synthesis of benzamide-substituted chalcones and determination of their antiproliferative activity as well as preliminary evaluation of EGFR and CDK2 inhibitory potential using both receptor binding and computational methods. METHODS We synthesized 13 benzamide-substituted chalcone derivatives and tested their antiproliferative activity against MCF-7, HT-29 and U373MG cell-lines using Sulforhodamine B Assay. Four compounds were examined for activity against EGFR and CDK2 kinase. The compounds were docked into both EGFR and CDK2 using Glide software. The stability of the interactions for most active compound was evaluated by Molecular Dynamics Simulation using Desmond software. Molecular Docking studies on mutant EGFR (T790M, T790M/L858R, and T790M/C797S) were also carried out. RESULTS From the SRB assay, we concluded that compounds 1g, and 1k were effective in inhibiting the growth of MCF-7 cell line whereas the other compounds were moderately active. Most compounds were either moderately active or inactive on U373 MG and HT-29 cell line. Compounds 1g and 1k showed good inhibitory activity against CDK2 kinase while 1d and 1f were moderately active. Compounds 1d, 1f, 1g, and 1k were moderately active against EGFR kinase. Molecular docking reveals involvement of one hydrogen bond with Met793 in binding with EGFR however; it was not stable during simulation and these compounds bind to the receptor mainly via hydrophobic contacts. This fact also points towards a different orientation of the inhibitor within the active site of EGFR kinase. Binding mode analysis for CDK2 inhibition studies indicate that hydrogen bonding interaction with Lys 33 and Leu83 are important for the activity. These interactions were found to be stable throughout the simulation. Considering the results for wild-type EGFR inhibition, the docking studies on mutants were performed and which indicate that the compounds bind to the mutant EGFR but the amino acid residues involved are similar to the wild-type EGFR and therefore, the selectivity seems to be limited. CONCLUSION These benzamide-substituted chalcone derivatives will be useful as lead molecules for the further development of newer inhibitors of EGFR and/or CDK2 kinases.
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Affiliation(s)
- Akshada Joshi
- Department of Pharmaceutical Chemistry, Prin. K. M. Kundnani College of Pharmacy, Mumbai 400005. India
| | - Heena Bhojwani
- Department of Pharmaceutical Chemistry, Prin. K. M. Kundnani College of Pharmacy, Mumbai 400005. India
| | - Ojas Wagal
- Department of Pharmaceutical Chemistry, Prin. K. M. Kundnani College of Pharmacy, Mumbai 400005. India
| | - Khushboo Begwani
- Department of Pharmaceutical Chemistry, Prin. K. M. Kundnani College of Pharmacy, Mumbai 400005. India
| | - Urmila Joshi
- Department of Pharmaceutical Chemistry, Prin. K. M. Kundnani College of Pharmacy, Mumbai 400005. India
| | - Sadhana Sathaye
- Department of Pharmaceutical Science and Technology, Institute of Chemical Technology, Mumbai 400019. India
| | - Divya Kanchan
- Department of Pharmaceutical Chemistry, Prin. K. M. Kundnani College of Pharmacy, Mumbai 400005. India
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18
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Bhatia P, Sharma V, Alam O, Manaithiya A, Alam P, Kahksha, Alam MT, Imran M. Novel quinazoline-based EGFR kinase inhibitors: A review focussing on SAR and molecular docking studies (2015-2019). Eur J Med Chem 2020; 204:112640. [PMID: 32739648 DOI: 10.1016/j.ejmech.2020.112640] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 06/29/2020] [Accepted: 07/01/2020] [Indexed: 12/11/2022]
Abstract
The over expression of EGFR has been recognized as the driver mechanism in the occurrence and progression of carcinomas such as lung cancer, breast cancer, pancreatic cancer, etcetera. EGFR receptor was thus established as an important target for the management of solid tumors. The occurrence of resistance caused as a result of mutations in EGFR has presented a formidable challenge in the discovery of novel inhibitors of EGFR. This has resulted in the development of three generations of EGFR TKIs. Newer mutations like C797S cause failure of Osimertinib and other EGFR TKIs belonging to the third-generation caused by the development of resistance. In this review, we have summarized the work done in the last five years to overcome the limitations of currently marketed drugs, giving structural activity relationships of quinazoline-based lead compounds synthesized and tested recently. We have also highlighted the shortcomings of the currently used approaches and have provided guidance for circumventing these limitations. Our review would help medicinal chemists streamline and guide their efforts towards developing novel quinazoline-based EGFR inhibitors.
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Affiliation(s)
- Parth Bhatia
- Medicinal Chemistry and Molecular Modelling Lab, Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
| | - Vrinda Sharma
- Medicinal Chemistry and Molecular Modelling Lab, Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
| | - Ozair Alam
- Medicinal Chemistry and Molecular Modelling Lab, Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India.
| | - Ajay Manaithiya
- Medicinal Chemistry and Molecular Modelling Lab, Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
| | - Perwaiz Alam
- Medicinal Chemistry and Molecular Modelling Lab, Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
| | - Kahksha
- Medicinal Chemistry and Molecular Modelling Lab, Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
| | - Md Tauquir Alam
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Northern Border University, Rafha, Pin Code 91911, Saudi Arabia
| | - Mohd Imran
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Northern Border University, Rafha, Pin Code 91911, Saudi Arabia
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19
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Huang WY, Zhang XR, Lyu L, Wang SQ, Zhang XT. Pyridazino[1,6-b]quinazolinones as new anticancer scaffold: Synthesis, DNA intercalation, topoisomerase I inhibition and antitumor evaluation in vitro and in vivo. Bioorg Chem 2020; 99:103814. [PMID: 32278208 DOI: 10.1016/j.bioorg.2020.103814] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 02/26/2020] [Accepted: 03/31/2020] [Indexed: 12/21/2022]
Abstract
A new anticancer N-containing heterocyclic scaffold was designed and 30 pyridazino[1,6-b]quinazolinone derivatives were synthesized and characterized. Antiproliferation evaluation in vitro against four human cancer cell lines including SK-OV-3(ovarian cell), CNE-2(nasopharyngeal cell), MGC-803(gastric cell) and NCI-H460(lung cell) indicated that most of them exhibited potent anticancer activity and the IC50 value of the most potent compound lowered to sub-μM. DNA interaction assay indicated that compounds 4e, 4g, 6o, 6p, 8o can intercalate into DNA. Compounds 6 and 8 also demonstrated potent topoisomerase I (topo I) activity. Annexin V- FITC/propidium iodide dual staining assay and cell cycle analysis indicated that 2-(4-bromophenyl)-4-((3-(diethylamino)propyl)amino) -10H-pyridazino [1,6-b]quinazolin- 10-one (8p) could induce arrest cell cycle at G2 phase and apoptosis in MGC-803 cells in a dose-dependent manner. The in vivo antitumor efficiency of compound 8p was also evaluated on MGC-803 xenograft nude mice, and the relative tumor growth inhibition was up to 55.9% at a dose of 20 mg/kg per two days. The results suggested that pyridazino[1,6-b]-quinazolinones might serve as a promising novel scaffold for the development of new antitumor agents.
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Affiliation(s)
- Wan-Yun Huang
- Department of Pharmaceutical Chemistry, College of Pharmacy, Guilin Medical University, Guilin 541004, China.
| | - Xiao-Rong Zhang
- Department of Pharmaceutical Chemistry, College of Pharmacy, Guilin Medical University, Guilin 541004, China
| | - Liang Lyu
- Department of Pharmacology, College of Pharmacy, Guilin Medical University, Guilin 541004, China.
| | - Shu-Qin Wang
- Department of Pharmaceutical Chemistry, College of Pharmacy, Guilin Medical University, Guilin 541004, China
| | - Xiao-Ting Zhang
- Department of Pharmaceutical Chemistry, College of Pharmacy, Guilin Medical University, Guilin 541004, China
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20
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Le Y, Gan Y, Fu Y, Liu J, Li W, Zou X, Zhou Z, Wang Z, Ouyang G, Yan L. Design, synthesis and in vitro biological evaluation of quinazolinone derivatives as EGFR inhibitors for antitumor treatment. J Enzyme Inhib Med Chem 2020; 35:555-564. [PMID: 31967481 PMCID: PMC7006757 DOI: 10.1080/14756366.2020.1715389] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
In this paper, a series of novel 3-methyl-quinazolinone derivatives was designed, synthesised and evaluated for antitumor activity in vitro on wild type epidermal growth factor receptor tyrosine kinase (EGFRwt-TK) and three human cancer cell lines including A549, PC-3, and SMMC-7721. The results displayed that some of the compounds had good activities, especially 2-{4-[(3-Fluoro-phenylimino)-methyl]-phenoxymethyl}-3-methyl-3H-quinazolin-4-one (5 g), 2-{4-[(3,4-Difluoro-phenylimino)-methyl]-phenoxymethyl}-3-methyl-3H-quinazolin-4-one (5k) and 2-{4-[(3,5-Difluoro-phenylimino)-methyl]-phenoxymethyl}-3-methyl-3H-quinazolin-4-one (5 l) showed high antitumor activities against three cancer cell lines. Moreover, compound 5k could induce late apoptosis of A549 cells at high concentrations and arrest cell cycle of A549 cells in the G2/M phase at tested concentrations. Also, compound 5k could inhibit the EGFRwt-TK with IC50 value of 10 nM. Molecular docking data indicates that the compound 5k may exert inhibitory activity by forming stable hydrogen bonds with the R817, T830 amino acid residues and cation-Π interaction with the K72 residue of EGFRwt-TK.
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Affiliation(s)
- Yi Le
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for Research and Development of Fine Chemicals, Guizhou University, Guiyang, China.,School of Pharmaceutical Sciences, Guizhou University, Guiyang, China.,Guizhou Engineering Laboratory for Synthetic Drugs, Guiyang, China
| | - Yiyuan Gan
- School of Pharmaceutical Sciences, Guizhou University, Guiyang, China
| | - Yihong Fu
- School of Pharmaceutical Sciences, Guizhou University, Guiyang, China
| | - Jiamin Liu
- School of Pharmaceutical Sciences, Guizhou University, Guiyang, China
| | - Wen Li
- School of Pharmaceutical Sciences, Guizhou University, Guiyang, China
| | - Xue Zou
- Clinical Research Center, Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Zhixu Zhou
- School of Pharmaceutical Sciences, Guizhou University, Guiyang, China.,Guizhou Engineering Laboratory for Synthetic Drugs, Guiyang, China.,Clinical Research Center, Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Zhenchao Wang
- School of Pharmaceutical Sciences, Guizhou University, Guiyang, China.,Guizhou Engineering Laboratory for Synthetic Drugs, Guiyang, China
| | - Guiping Ouyang
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for Research and Development of Fine Chemicals, Guizhou University, Guiyang, China.,School of Pharmaceutical Sciences, Guizhou University, Guiyang, China.,Guizhou Engineering Laboratory for Synthetic Drugs, Guiyang, China
| | - Longjia Yan
- School of Pharmaceutical Sciences, Guizhou University, Guiyang, China.,Guizhou Engineering Laboratory for Synthetic Drugs, Guiyang, China.,Clinical Research Center, Affiliated Hospital of Guizhou Medical University, Guiyang, China
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21
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Zhang T, Liang Y, Zuo P, Jing S, Li T, Wang Y, Lv C, Li D, Zhang J, Wei Z. 20(S)-Protopanaxadiol blocks cell cycle progression by targeting epidermal growth factor receptor. Food Chem Toxicol 2020; 135:111017. [DOI: 10.1016/j.fct.2019.111017] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 11/29/2019] [Accepted: 12/01/2019] [Indexed: 12/11/2022]
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22
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Engelhardt H, Böse D, Petronczki M, Scharn D, Bader G, Baum A, Bergner A, Chong E, Döbel S, Egger G, Engelhardt C, Ettmayer P, Fuchs JE, Gerstberger T, Gonnella N, Grimm A, Grondal E, Haddad N, Hopfgartner B, Kousek R, Krawiec M, Kriz M, Lamarre L, Leung J, Mayer M, Patel ND, Simov BP, Reeves JT, Schnitzer R, Schrenk A, Sharps B, Solca F, Stadtmüller H, Tan Z, Wunberg T, Zoephel A, McConnell DB. Start Selective and Rigidify: The Discovery Path toward a Next Generation of EGFR Tyrosine Kinase Inhibitors. J Med Chem 2019; 62:10272-10293. [PMID: 31689114 DOI: 10.1021/acs.jmedchem.9b01169] [Citation(s) in RCA: 87] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The epidermal growth factor receptor (EGFR), when carrying an activating mutation like del19 or L858R, acts as an oncogenic driver in a subset of lung tumors. While tumor responses to tyrosine kinase inhibitors (TKIs) are accompanied by marked tumor shrinkage, the response is usually not durable. Most patients relapse within two years of therapy often due to acquisition of an additional mutation in EGFR kinase domain that confers resistance to TKIs. Crucially, oncogenic EGFR harboring both resistance mutations, T790M and C797S, can no longer be inhibited by currently approved EGFR TKIs. Here, we describe the discovery of BI-4020, which is a noncovalent, wild-type EGFR sparing, macrocyclic TKI. BI-4020 potently inhibits the above-described EGFR variants and induces tumor regressions in a cross-resistant EGFRdel19 T790M C797S xenograft model. Key was the identification of a highly selective but moderately potent benzimidazole followed by complete rigidification of the molecule through macrocyclization.
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Affiliation(s)
- Harald Engelhardt
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Dietrich Böse
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Mark Petronczki
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Dirk Scharn
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Gerd Bader
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Anke Baum
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Andreas Bergner
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Eugene Chong
- Boehringer Ingelheim Pharmaceuticals, Inc. , 900 Ridgebury Road , Ridgefield , Connecticut 06877 , United States
| | - Sandra Döbel
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Georg Egger
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Christian Engelhardt
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Peter Ettmayer
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Julian E Fuchs
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Thomas Gerstberger
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Nina Gonnella
- Boehringer Ingelheim Pharmaceuticals, Inc. , 900 Ridgebury Road , Ridgefield , Connecticut 06877 , United States
| | - Andreas Grimm
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Elisabeth Grondal
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Nizar Haddad
- Boehringer Ingelheim Pharmaceuticals, Inc. , 900 Ridgebury Road , Ridgefield , Connecticut 06877 , United States
| | - Barbara Hopfgartner
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Roland Kousek
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Mariusz Krawiec
- Boehringer Ingelheim Pharmaceuticals, Inc. , 900 Ridgebury Road , Ridgefield , Connecticut 06877 , United States
| | - Monika Kriz
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Lyne Lamarre
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Joyce Leung
- Boehringer Ingelheim Pharmaceuticals, Inc. , 900 Ridgebury Road , Ridgefield , Connecticut 06877 , United States
| | - Moriz Mayer
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Nitinchandra D Patel
- Boehringer Ingelheim Pharmaceuticals, Inc. , 900 Ridgebury Road , Ridgefield , Connecticut 06877 , United States
| | - Biljana Peric Simov
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Jonathan T Reeves
- Boehringer Ingelheim Pharmaceuticals, Inc. , 900 Ridgebury Road , Ridgefield , Connecticut 06877 , United States
| | - Renate Schnitzer
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Andreas Schrenk
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Bernadette Sharps
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Flavio Solca
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Heinz Stadtmüller
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Zhulin Tan
- Boehringer Ingelheim Pharmaceuticals, Inc. , 900 Ridgebury Road , Ridgefield , Connecticut 06877 , United States
| | - Tobias Wunberg
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Andreas Zoephel
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
| | - Darryl B McConnell
- Boehringer Ingelheim RCV GmbH & Co KG , Dr-Boehringer-Gasse 5-11 , Vienna 1120 , Austria
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23
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Ilmi R, Tseriotou E, Stylianou P, Christou YA, Ttofi I, Dietis N, Pitris C, Odysseos AD, Georgiades SN. A Novel Conjugate of Bis[((4-bromophenyl)amino)quinazoline], a EGFR-TK Ligand, with a Fluorescent Ru(II)-Bipyridine Complex Exhibits Specific Subcellular Localization in Mitochondria. Mol Pharm 2019; 16:4260-4273. [PMID: 31508966 DOI: 10.1021/acs.molpharmaceut.9b00608] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The epidermal growth factor receptor (EGFR) is a key target in anticancer research, whose aberrant function in malignancies has been linked to severe irregularities in critical cellular processes, including cell cycle progression, proliferation, differentiation, and survival. EGFR mutant variants, either transmembrane or translocated to the mitochondria and/or the nucleus, often exhibit resistance to EGFR inhibitors. The ability to noninvasively image and quantify EGFR provides novel approaches in the detection, monitoring, and treatment of EGFR-related malignancies. The current study aimed to deliver a new theranostic agent that combines fluorescence imaging properties with EGFR inhibition. This was achieved via conjugation of an in-house-developed ((4-bromophenyl)amino)quinazoline inhibitor of mutant EGFR-TK, selected from a focused aminoquinazoline library, with a [Ru(bipyridine)3]2+ fluorophore. A triethyleneglycol-derived diamino linker featuring (+)-ionizable sites was employed to link the two functional moieties, affording two unprecedented Ru conjugates with 1:1 and 2:1 stoichiometry of aminoquinazoline to the Ru complex (mono-quinazoline-Ru-conjugate and bis-quinazoline-Ru-conjugate, respectively). The bis-quinazoline-Ru-conjugate, which retains an essential inhibitory activity, was found by fluorescence imaging to be effectively uptaken by Uppsala 87 malignant glioma (grade IV malignant glioma) cells. The fluorescence imaging study and a time-resolved fluorescence resonance energy transfer study indicated a specific subcellular distribution of the conjugate that coincides with that of a mitochondria-targeted dye, suggesting mitochondrial localization of the conjugate and potential association with mitochondria-translocated forms of EGFR. Mitochondrial localization was further documented by the specific concentration of the bis-quinazoline-Ru-conjugate in a mitochondrial isolation assay.
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Affiliation(s)
- Rashid Ilmi
- EPOS-Iasis, R&D , 5 Karyatidon Street , Nicosia 2028 , Cyprus
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24
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El-Sherief HA, Youssif BG, Abbas Bukhari SN, Abdelazeem AH, Abdel-Aziz M, Abdel-Rahman HM. Synthesis, anticancer activity and molecular modeling studies of 1,2,4-triazole derivatives as EGFR inhibitors. Eur J Med Chem 2018; 156:774-789. [DOI: 10.1016/j.ejmech.2018.07.024] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 07/05/2018] [Accepted: 07/09/2018] [Indexed: 01/17/2023]
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25
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Discovery of selective EGFR modulator to inhibit L858R/T790M double mutants bearing a N-9-Diphenyl-9H-purin-2-amine scaffold. Bioorg Med Chem 2018; 26:1810-1822. [DOI: 10.1016/j.bmc.2018.02.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Revised: 02/15/2018] [Accepted: 02/17/2018] [Indexed: 12/21/2022]
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26
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Filby PS, Rayat S. Curtin-Hammett-Driven Intramolecular Cyclization of Heteroenyne-Allenes to Phenanthridine-Fused Quinazoliniminiums. J Org Chem 2018; 83:1790-1796. [PMID: 29350930 DOI: 10.1021/acs.joc.7b02643] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Intramolecular cyclization of the heteroenyne-allene 2-((biphenyl-2-ylimino)methyleneamino)benzonitrile 1 to phenanthridine-fused quinazoliniminium salt PQ in the presence of a Lewis acid at room temperature involves formation of two new bonds: a C-C bond and a C-N bond. In this article, density functional theory (B3LYP and M06-2X) was employed in conjunction with 6-311G* basis set to gain insights into the mechanism of this cyclization reaction. The solvent effects were considered using Polarizable Continuum Model with nitromethane as the solvent. Our calculations show that C-C bond formation precedes the C-N bond formation. Precisely, the mechanism involves initial protonation of 1 at Nα and Nβ of the carbodiimide to form rapidly equilibrating conformers of the tautomers 2a,b and 3a,b. The Curtin-Hammett principle is invoked to determine the course of the reaction from these protonated species, which predicts that the intramolecular Friedel-Crafts type N-acylation (C-C bond formation) occurs between the protonated carbodiimide and biphenyl ring of the isomer 3b to form phenanthridinium cation 6b via transition state TS3b6b. Once 6b is formed, it converts to its most stable tautomers 8R and 9a. Once again, the Curtin-Hammett principle suggests that intramolecular nucleophilic attack is preferred from the tautomer 8R, where phenanthridine N-atom (Nβ) attacks the protonated nitrile group (C-N bond formation) and results in the formation of intermediate 11 via TS8R11. 11 then tautomerizes to the most stable cation 13. The coordination of the latter with the chloride anion yields the phenanthridine-fused heterocyclic salt PQ with overall release of energy. The pathways involving protonation at the nitrile (Nγ) of 1 were found to be energetically unfavorable and thus insignificant to the mechanism of cyclization.
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Affiliation(s)
- Pamela S Filby
- Department of Chemistry, Ball State University , Cooper Physical Science Building, Muncie, Indiana 47304-0445, United States
| | - Sundeep Rayat
- Department of Chemistry, Ball State University , Cooper Physical Science Building, Muncie, Indiana 47304-0445, United States
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