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Ren W, Deng Y, Ward JD, Vairin R, Bai R, Wanniarachchi HI, Hamal KB, Tankoano PE, Tamminga CS, Bueno LMA, Hamel E, Mason RP, Trawick ML, Pinney KG. Synthesis and biological evaluation of structurally diverse 6-aryl-3-aroyl-indole analogues as inhibitors of tubulin polymerization. Eur J Med Chem 2024; 263:115794. [PMID: 37984295 PMCID: PMC11019941 DOI: 10.1016/j.ejmech.2023.115794] [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: 06/16/2023] [Revised: 08/31/2023] [Accepted: 09/04/2023] [Indexed: 11/22/2023]
Abstract
The synthesis and evaluation of small-molecule inhibitors of tubulin polymerization remains a promising approach for the development of new therapeutic agents for cancer treatment. The natural products colchicine and combretastatin A-4 (CA4) inspired significant drug discovery campaigns targeting the colchicine site located on the beta-subunit of the tubulin heterodimer, but so far these efforts have not yielded an approved drug for cancer treatment in human patients. Interest in the colchicine site was enhanced by the discovery that a subset of colchicine site agents demonstrated dual functionality as both potent antiproliferative agents and effective vascular disrupting agents (VDAs). Our previous studies led to the discovery and development of a 2-aryl-3-aroyl-indole analogue (OXi8006) that inhibited tubulin polymerization and demonstrated low nM IC50 values against a variety of human cancer cell lines. A water-soluble phosphate prodrug salt (OXi8007), synthesized from OXi8006, displayed promising vascular disrupting activity in mouse models of cancer. To further extend structure-activity relationship correlations, a series of 6-aryl-3-aroyl-indole analogues was synthesized and evaluated for their inhibition of tubulin polymerization and cytotoxicity against human cancer cell lines. Several structurally diverse molecules in this small library were strong inhibitors of tubulin polymerization and of MCF-7 and MDA-MB-231 human breast cancer cells. One of the most promising analogues (KGP591) caused significant G2/M arrest of MDA-MB-231 cells, disrupted microtubule structure and cell morphology in MDA-MB-231 cells, and demonstrated significant inhibition of MDA-MB-231 cell migration in a wound healing (scratch) assay. A phosphate prodrug salt, KGP618, synthesized from its parent phenolic precursor, KGP591, demonstrated significant reduction in bioluminescence signal when evaluated in vivo against an orthotopic model of kidney cancer (RENCA-luc) in BALB/c mice, indicative of VDA efficacy. The most active compounds from this series offer promise as anticancer therapeutic agents.
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Affiliation(s)
- Wen Ren
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX, 76798-7348, United States.
| | - Yuling Deng
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX, 76798-7348, United States.
| | - Jacob D Ward
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX, 76798-7348, United States.
| | - Rebecca Vairin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX, 76798-7348, United States.
| | - Ruoli Bai
- Molecular Pharmacology Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, Frederick National Laboratory for Cancer Research, National Institutes of Health, Frederick, MD, 21702, United States.
| | - Hashini I Wanniarachchi
- Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, 75390-9058, United States.
| | - Khagendra B Hamal
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX, 76798-7348, United States.
| | - Pouguiniseli E Tankoano
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX, 76798-7348, United States.
| | - Caleb S Tamminga
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX, 76798-7348, United States.
| | - Lorena M A Bueno
- Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, 75390-9058, United States.
| | - Ernest Hamel
- Molecular Pharmacology Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, Frederick National Laboratory for Cancer Research, National Institutes of Health, Frederick, MD, 21702, United States.
| | - Ralph P Mason
- Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, 75390-9058, United States.
| | - Mary Lynn Trawick
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX, 76798-7348, United States.
| | - Kevin G Pinney
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX, 76798-7348, United States.
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Ren W, Vairin R, Ward JD, Francis R, VanNatta J, Bai R, Tankoano PE, Deng Y, Hamel E, Trawick ML, Pinney KG. Structure Guided Design, Synthesis, and Biological Evaluation of Oxetane-Containing Indole Analogues. Bioorg Med Chem 2023; 92:117400. [PMID: 37556912 PMCID: PMC10848874 DOI: 10.1016/j.bmc.2023.117400] [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: 05/20/2023] [Revised: 06/28/2023] [Accepted: 06/29/2023] [Indexed: 08/11/2023]
Abstract
The oxetane functional group offers a variety of potential advantages when incorporated within appropriate therapeutic agents as a ketone surrogate. OXi8006, a 2-aryl-3-aroyl-indole analogue, functions as a small-molecule inhibitor of tubulin polymerization that has a dual mechanism of action as both an antiproliferative agent and a tumor-selective vascular disrupting agent. Replacement of the bridging ketone moiety in OXi8006 with an oxetane functional group has expanded structure activity relationship (SAR) knowledge and provided insights regarding oxetane incorporation within this class of molecules. A new synthetic method using an oxetane-containing tertiary alcohol subjected to Lewis acid catalyzed conditions led to successful Friedel-Crafts alkylation and yielded fourteen new oxetane-containing indole-based molecules. This synthetic approach represents the first method to successfully install an oxetane ring at the 3-position of a 2-aryl-indole system. Several analogues showed potent cytotoxicity (micromolar GI50 values) against human breast cancer cell lines (MCF-7 and MDA-MB-231) and a pancreatic cancer cell line (PANC-1), although they proved to be ineffective as inhibitors of tubulin polymerization. Molecular docking studies comparing colchicine with the OXi8006-oxetane analogue 5m provided a rationale for the differential interaction of these molecules with the colchicine site on the tubulin heterodimer.
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Affiliation(s)
- Wen Ren
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX 76798-7348, United States
| | - Rebecca Vairin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX 76798-7348, United States
| | - Jacob D Ward
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX 76798-7348, United States
| | - Ricardo Francis
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX 76798-7348, United States
| | - Jenny VanNatta
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX 76798-7348, United States
| | - Ruoli Bai
- Molecular Pharmacology Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, Frederick National Laboratory for Cancer Research, National Institutes of Health, Frederick, MD 21702, United States
| | - Pouguiniseli E Tankoano
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX 76798-7348, United States
| | - Yuling Deng
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX 76798-7348, United States
| | - Ernest Hamel
- Molecular Pharmacology Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, Frederick National Laboratory for Cancer Research, National Institutes of Health, Frederick, MD 21702, United States
| | - Mary Lynn Trawick
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX 76798-7348, United States
| | - Kevin G Pinney
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place, No. 97348, Waco, TX 76798-7348, United States.
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Anticancer properties of indole derivatives as IsoCombretastatin A-4 analogues. Eur J Med Chem 2021; 223:113656. [PMID: 34171660 DOI: 10.1016/j.ejmech.2021.113656] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 06/14/2021] [Accepted: 06/14/2021] [Indexed: 12/19/2022]
Abstract
In this study, a variety of original ligands related to Combretastatin A-4 and isoCombretastatin A-4, able to inhibit the tubulin polymerization into microtubules, was designed, synthesized, and evaluated. Our lead compound 15d having a quinazoline as A-ring and a 2-substituted indole as B-ring separated by a N-methyl linker displayed a remarkable sub-nanomolar level of cytotoxicity (IC50 < 1 nM) against 9 human cancer cell lines.
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Liu L, O’Kelly D, Schuetze R, Carlson G, Zhou H, Trawick ML, Pinney KG, Mason RP. Non-Invasive Evaluation of Acute Effects of Tubulin Binding Agents: A Review of Imaging Vascular Disruption in Tumors. Molecules 2021; 26:2551. [PMID: 33925707 PMCID: PMC8125421 DOI: 10.3390/molecules26092551] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Revised: 04/15/2021] [Accepted: 04/19/2021] [Indexed: 12/16/2022] Open
Abstract
Tumor vasculature proliferates rapidly, generally lacks pericyte coverage, and is uniquely fragile making it an attractive therapeutic target. A subset of small-molecule tubulin binding agents cause disaggregation of the endothelial cytoskeleton leading to enhanced vascular permeability generating increased interstitial pressure. The resulting vascular collapse and ischemia cause downstream hypoxia, ultimately leading to cell death and necrosis. Thus, local damage generates massive amplification and tumor destruction. The tumor vasculature is readily accessed and potentially a common target irrespective of disease site in the body. Development of a therapeutic approach and particularly next generation agents benefits from effective non-invasive assays. Imaging technologies offer varying degrees of sophistication and ease of implementation. This review considers technological strengths and weaknesses with examples from our own laboratory. Methods reveal vascular extent and patency, as well as insights into tissue viability, proliferation and necrosis. Spatiotemporal resolution ranges from cellular microscopy to single slice tomography and full three-dimensional views of whole tumors and measurements can be sufficiently rapid to reveal acute changes or long-term outcomes. Since imaging is non-invasive, each tumor may serve as its own control making investigations particularly efficient and rigorous. The concept of tumor vascular disruption was proposed over 30 years ago and it remains an active area of research.
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Affiliation(s)
- Li Liu
- Department of Radiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; (L.L.); (D.O.); (R.S.); (H.Z.)
| | - Devin O’Kelly
- Department of Radiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; (L.L.); (D.O.); (R.S.); (H.Z.)
| | - Regan Schuetze
- Department of Radiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; (L.L.); (D.O.); (R.S.); (H.Z.)
| | - Graham Carlson
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX 76798, USA; (G.C.); (M.L.T.); (K.G.P.)
| | - Heling Zhou
- Department of Radiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; (L.L.); (D.O.); (R.S.); (H.Z.)
| | - Mary Lynn Trawick
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX 76798, USA; (G.C.); (M.L.T.); (K.G.P.)
| | - Kevin G. Pinney
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX 76798, USA; (G.C.); (M.L.T.); (K.G.P.)
| | - Ralph P. Mason
- Department of Radiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; (L.L.); (D.O.); (R.S.); (H.Z.)
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Hamze A, Alami M, Provot O. Developments of isoCombretastatin A-4 derivatives as highly cytotoxic agents. Eur J Med Chem 2020; 190:112110. [PMID: 32061961 DOI: 10.1016/j.ejmech.2020.112110] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 01/29/2020] [Accepted: 01/29/2020] [Indexed: 10/25/2022]
Abstract
Combretastatin A-4 (CA-4) is a natural anti-cancer agent isolated in 1989 from the African willow tree, Combretum caffrum. Due to its chemical simplicity, this (Z)-stilbene has been the subject of many structural modifications mainly to improve its chemical and metabolic stability. Beside a large number of synthetic analogues, isoCombretastatin A-4 (isoCA-4), has proved to be a solution of choice since this non-natural isomer of CA-4 is stable, easier to synthesize and has equivalent antitumor properties as CA-4. In this review, we will present the structure-activity relationships (SARs) around isoCA-4 since its discovery in 2007. In a first part, we will describe some alternatives to replace the phenol B-ring of isoCA-4, then we will focus on the variations made on the 1,1-ethylene double bond and then, we will evocate very recent exiting results concerning the possible replacements of the 3,4,5-trimethoxyphenyl A-ring of isoCA-4 by suitable heterocycles.
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Affiliation(s)
- Abdallah Hamze
- Université Paris-Saclay, CNRS, BioCIS, 92290, Châtenay-Malabry, France
| | - Mouad Alami
- Université Paris-Saclay, CNRS, BioCIS, 92290, Châtenay-Malabry, France.
| | - Olivier Provot
- Université Paris-Saclay, CNRS, BioCIS, 92290, Châtenay-Malabry, France.
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Maguire CJ, Carlson GJ, Ford JW, Strecker TE, Hamel E, Trawick ML, Pinney KG. Synthesis and biological evaluation of structurally diverse α-conformationally restricted chalcones and related analogues. MEDCHEMCOMM 2019; 10:1445-1456. [PMID: 31534659 PMCID: PMC6734540 DOI: 10.1039/c9md00127a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Accepted: 05/27/2019] [Indexed: 12/19/2022]
Abstract
Numerous members of the combretastatin and chalcone families of natural products function as inhibitors of tubulin polymerization through a binding interaction at the colchicine site on β-tubulin. These molecular scaffolds inspired the development of many structurally modified derivatives and analogues as promising anticancer agents. A productive design blueprint that involved molecular hybridization of the pharmacophore moieties of combretastatin A-4 (CA4) and the chalcones led to the discovery of two promising lead molecules referred to as KGP413 and SD400. The corresponding water-soluble phosphate prodrug salts of KGP413 and SD400 selectively damaged tumor-associated vasculature, thus highlighting the potential development of these molecules as vascular disrupting agents (VDAs). These previous studies prompted our current investigation of conformationally restricted chalcones. Herein, we report the synthesis of cyclic chalcones and related analogues that incorporate structural motifs of CA4, and evaluation of their cytotoxicity against human cancer cell lines [NCI-H460 (lung), DU-145 (prostate), and SK-OV-3 (ovarian)]. While these molecules proved inactive as inhibitors of tubulin polymerization (IC50 > 20 μM), eight molecules demonstrated good antiproliferative activity (GI50 < 20 μM) against all three cancer cell lines, and compounds 2j and 2l demonstrated sub-micromolar cytotoxicity. To the best of our knowledge these molecules represent the most potent (based on GI50) cyclic chalcones known to date, and are promising lead molecules for continued investigation.
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Affiliation(s)
- Casey J Maguire
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place #97348 , Waco , TX 76798-7348 , USA . ; Tel: +1 (254) 710 4117
| | - Graham J Carlson
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place #97348 , Waco , TX 76798-7348 , USA . ; Tel: +1 (254) 710 4117
| | - Jacob W Ford
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place #97348 , Waco , TX 76798-7348 , USA . ; Tel: +1 (254) 710 4117
| | - Tracy E Strecker
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place #97348 , Waco , TX 76798-7348 , USA . ; Tel: +1 (254) 710 4117
| | - Ernest Hamel
- Screening Technologies Branch , Developmental Therapeutics Program , Division of Cancer Treatment and Diagnosis , National Cancer Institute , Frederick National Laboratory for Cancer Research , National Institutes of Health , Frederick , MD 21702 , USA
| | - Mary Lynn Trawick
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place #97348 , Waco , TX 76798-7348 , USA . ; Tel: +1 (254) 710 4117
| | - Kevin G Pinney
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place #97348 , Waco , TX 76798-7348 , USA . ; Tel: +1 (254) 710 4117
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7
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Niu H, Strecker TE, Gerberich JL, Campbell JW, Saha D, Mondal D, Hamel E, Chaplin DJ, Mason RP, Trawick ML, Pinney KG. Structure Guided Design, Synthesis, and Biological Evaluation of Novel Benzosuberene Analogues as Inhibitors of Tubulin Polymerization. J Med Chem 2019; 62:5594-5615. [PMID: 31059248 DOI: 10.1021/acs.jmedchem.9b00551] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A promising design paradigm for small-molecule inhibitors of tubulin polymerization that bind to the colchicine site draws structural inspiration from the natural products colchicine and combretastatin A-4 (CA4). Our previous studies with benzocycloalkenyl and heteroaromatic ring systems yielded promising inhibitors with dihydronaphthalene and benzosuberene analogues featuring phenolic (KGP03 and KGP18) and aniline (KGP05 and KGP156) congeners emerging as lead agents. These molecules demonstrated dual mechanism of action, functioning both as potent vascular disrupting agents (VDAs) and as highly cytotoxic anticancer agents. A further series of analogues was designed to extend functional group diversity and investigate regioisomeric tolerance. Ten new molecules were effective inhibitors of tubulin polymerization (IC50 < 5 μM) with seven of these exhibiting highly potent activity comparable to CA4, KGP18, and KGP03. For one of the most effective agents, dose-dependent vascular shutdown was demonstrated using dynamic bioluminescence imaging in a human prostate tumor xenograft growing in a rat.
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Affiliation(s)
- Haichan Niu
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place, No. 97348 , Waco , Texas 76798-7348 , United States
| | - Tracy E Strecker
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place, No. 97348 , Waco , Texas 76798-7348 , United States
| | - Jeni L Gerberich
- Department of Radiology , The University of Texas Southwestern Medical Center , 5323 Harry Hines Boulevard , Dallas , Texas 75390-9058 , United States
| | - James W Campbell
- Department of Radiology , The University of Texas Southwestern Medical Center , 5323 Harry Hines Boulevard , Dallas , Texas 75390-9058 , United States
| | - Debabrata Saha
- Department of Radiology Oncology, Division of Molecular Radiation Biology , The University of Texas Southwestern Medical Center , 2201 Inwood Road , Dallas , Texas 75390-9187 , United States
| | - Deboprosad Mondal
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place, No. 97348 , Waco , Texas 76798-7348 , United States
| | - Ernest Hamel
- Screening Technologies Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis , National Cancer Institute, Frederick National Laboratory for Cancer Research, National Institutes of Health , Frederick , Maryland 21702 , United States
| | - David J Chaplin
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place, No. 97348 , Waco , Texas 76798-7348 , United States.,Mateon Therapeutics, Inc. , 701 Gateway Boulevard, Suite 210 , South San Francisco , California 94080 , United States
| | - Ralph P Mason
- Department of Radiology , The University of Texas Southwestern Medical Center , 5323 Harry Hines Boulevard , Dallas , Texas 75390-9058 , United States
| | - Mary Lynn Trawick
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place, No. 97348 , Waco , Texas 76798-7348 , United States
| | - Kevin G Pinney
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place, No. 97348 , Waco , Texas 76798-7348 , United States
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Mondal D, Niu H, Pinney KG. Efficient Synthetic Methodology for the Construction of Dihydronaphthalene and Benzosuberene Molecular Frameworks. Tetrahedron Lett 2018; 60:397-401. [PMID: 31061544 DOI: 10.1016/j.tetlet.2018.12.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Benzosuberene analogues (1 and 2) and dihydronaphthalene analogues (3 and 4) function as potent inhibitors of tubulin polymerization, demonstrate pronounced cytotoxicity (low nM to pM range) against human cancer cell lines, and are promising vascular disrupting agents (VDAs). As such, these compounds represent lead anticancer agents with potential translatability towards the clinic. Methodology previously established by us (and others) facilitated synthetic access to a variety of structural and functional group modifications necessary to explore structure activity relationship considerations directed towards the development of these (and related) molecules as potential therapeutic agents. During the course of these studies it became apparent that the availability of synthetic methodology to facilitate direct conversion of the phenolic-based compounds to their corresponding aniline congeners would be beneficial. Accordingly, modified synthetic routes toward these target phenols (benzosuberene 1 and dihydronaphthalene 3) were developed in order to improve scalability and overall yield [45-57% (1) and 32% (3)]. Moreover, benzosuberene-based phenolic analogue 1 and separately dihydronaphthalene-based phenolic analogue 3 were successfully converted into their corresponding aniline analogues 2 and 4 in good yield (>60% over three steps) using a palladium catalyzed amination reaction.
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Affiliation(s)
- Deboprosad Mondal
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place # 97348, Waco, Texas 76798-7438, United States
| | - Haichan Niu
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place # 97348, Waco, Texas 76798-7438, United States
| | - Kevin G Pinney
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place # 97348, Waco, Texas 76798-7438, United States
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Kumar SV, Rani GU, Divyalakshmi M, Bhuvanesh N, Muthusubramanian S, Perumal S. Synthesis of benzosuberone-tethered spirooxindoles: 1-3-dipolar cycloaddition of azomethine ylides and arylidene benzosuberones. Mol Divers 2018; 23:669-680. [PMID: 30535898 DOI: 10.1007/s11030-018-9901-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Accepted: 12/03/2018] [Indexed: 01/05/2023]
Abstract
Expedient synthesis of benzosuberone-tethered spirooxindoles was accomplished by a three-component 1,3-dipolar cycloaddition reaction between azomethine ylide (generated in situ) and arylidene benzosuberone. This protocol offers good yield and wide functional group tolerance under mild reaction condition with high regio- and stereoselectivities.
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Affiliation(s)
- Sundaravel Vivek Kumar
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, Tamil Nadu, 625021, India
| | - Gandhi Uma Rani
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, Tamil Nadu, 625021, India
| | - Manohar Divyalakshmi
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, Tamil Nadu, 625021, India
| | - Nattamai Bhuvanesh
- X-ray Diffraction Laboratory, Department of Chemistry, Texas A&M University, College Station, USA
| | - Shanmugam Muthusubramanian
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, Tamil Nadu, 625021, India.
| | - Subbu Perumal
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, Tamil Nadu, 625021, India.
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Mondal D, Ford J, Pinney KG. Improved Methodology for the Synthesis of a Cathepsin B Cleavable Dipeptide Linker, Widely Used in Antibody-Drug Conjugate Research. Tetrahedron Lett 2018; 59:3594-3599. [PMID: 31156276 PMCID: PMC6541422 DOI: 10.1016/j.tetlet.2018.08.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Antibody-drug conjugates (ADCs) represent an emerging class of biopharmaceutical agents that deliver highly potent anticancer agents (payloads) selectively to tumors or components associated with the tumor microenvironment. The linker, responsible for the connection between the antibody and payload, is a crucial component of ADCs. In certain examples the linker is composed of a cleavable short peptide which imparts an additional aspect of selectivity. Especially prevalent is the cathepsin B cleavable Mc-Val-Cit-PABOH linker utilized in many pre-clinical ADC candidates, as well as the FDA approved ADC ADCETRIS® (brentuximab vedotin). An alternative route for the synthesis of the cathepsin B cleavable Mc-Val-Cit-PABOH linker is reported herein that involved six steps from l-Citrulline and proceeded with a 50% overall yield. In this modified route, the spacer (a para-aminobenzyl alcohol moiety) was incorporated via HATU coupling followed by dipeptide formation. Importantly, this route avoided undesirable epimerization and proceeded with improved overall yield. Utilizing this methodology, a drug-linker construct incorporating a potent small-molecule inhibitor of tubulin polymerization (referred to as KGP05), was synthesized as a representative example.
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Affiliation(s)
- Deboprosad Mondal
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place # 97348, Waco, Texas 76798-7438, United States
| | - Jacob Ford
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place # 97348, Waco, Texas 76798-7438, United States
| | - Kevin G Pinney
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place # 97348, Waco, Texas 76798-7438, United States
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Maguire CJ, Chen Z, Mocharla VP, Sriram M, Strecker TE, Hamel E, Zhou H, Lopez R, Wang Y, Mason RP, Chaplin DJ, Trawick ML, Pinney KG. Synthesis of dihydronaphthalene analogues inspired by combretastatin A-4 and their biological evaluation as anticancer agents. MEDCHEMCOMM 2018; 9:1649-1662. [PMID: 30429970 PMCID: PMC6201230 DOI: 10.1039/c8md00322j] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 08/13/2018] [Indexed: 12/17/2022]
Abstract
The natural products colchicine and combretastatin A-4 (CA4) have provided inspiration for the discovery and development of a wide array of derivatives and analogues that inhibit tubulin polymerization through a binding interaction at the colchicine site on β-tubulin. A water-soluble phosphate prodrug salt of CA4 (referred to as CA4P) has demonstrated the ability to selectively damage tumor-associated vasculature and ushered in a new class of developmental anticancer agents known as vascular disrupting agents (VDAs). Through a long-term program of structure activity relationship (SAR) driven inquiry, we discovered that the dihydronaphthalene molecular scaffold provided access to small-molecule inhibitors of tubulin polymerization. In particular, a dihydronaphthalene analogue bearing a pendant trimethoxy aryl ring (referred to as KGP03) and a similar aroyl ring (referred to as KGP413) were potent inhibitors of tubulin polymerization (IC50 = 1.0 and 1.2 μM, respectively) and displayed low nM cytotoxicity against human cancer cell lines. In order to enhance water-solubility for in vivo evaluation, the corresponding phosphate prodrug salts (KGP04 and KGP152, respectively) were synthesized. In a preliminary in vivo study in a SCID-BALB/c mouse model bearing the human breast tumor MDA-MB-231-luc, a 99% reduction in signal was observed with bioluminescence imaging (BLI) 4 h after IP administration of KGP152 (200 mg kg-1) indicating reduced tumor blood flow. In a separate study, disruption of tumor-associated blood flow in a Fischer rat bearing an A549-luc human lung tumor was observed by color Doppler ultrasound following administration of KGP04 (15 mg kg-1).
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Affiliation(s)
- Casey J Maguire
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place #97348 , Waco , TX 76798-7348 , USA . ; Tel: +(254) 710 4117
| | - Zhi Chen
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place #97348 , Waco , TX 76798-7348 , USA . ; Tel: +(254) 710 4117
| | - Vani P Mocharla
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place #97348 , Waco , TX 76798-7348 , USA . ; Tel: +(254) 710 4117
| | - Madhavi Sriram
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place #97348 , Waco , TX 76798-7348 , USA . ; Tel: +(254) 710 4117
| | - Tracy E Strecker
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place #97348 , Waco , TX 76798-7348 , USA . ; Tel: +(254) 710 4117
| | - Ernest Hamel
- Screening Technologies Branch , Developmental Therapeutics Program , Division of Cancer Treatment and Diagnosis , National Cancer Institute , Frederick National Laboratory for Cancer Research , National Institutes of Health , Frederick , MD 21702 , USA
| | - Heling Zhou
- Department of Radiology , The University of Texas Southwestern Medical Center , 5323 Harry Hines Boulevard , Dallas , TX 75390-9058 , USA
| | - Ramona Lopez
- Department of Radiology , The University of Texas Southwestern Medical Center , 5323 Harry Hines Boulevard , Dallas , TX 75390-9058 , USA
| | - Yifan Wang
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place #97348 , Waco , TX 76798-7348 , USA . ; Tel: +(254) 710 4117
| | - Ralph P Mason
- Department of Radiology , The University of Texas Southwestern Medical Center , 5323 Harry Hines Boulevard , Dallas , TX 75390-9058 , USA
| | - David J Chaplin
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place #97348 , Waco , TX 76798-7348 , USA . ; Tel: +(254) 710 4117
- Mateon Therapeutics, Inc. , 701 Gateway Boulevard, Suite 210 , South San Francisco , CA 94080 , USA
| | - Mary Lynn Trawick
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place #97348 , Waco , TX 76798-7348 , USA . ; Tel: +(254) 710 4117
| | - Kevin G Pinney
- Department of Chemistry and Biochemistry , Baylor University , One Bear Place #97348 , Waco , TX 76798-7348 , USA . ; Tel: +(254) 710 4117
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12
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Affiliation(s)
- Haider Behbehani
- Department of Chemistry, Faculty of Science, Kuwait University, Safat, Kuwait
| | - Kamal M. Dawood
- Department of Chemistry, Faculty of Science, Kuwait University, Safat, Kuwait
| | - Thoraya A. Farghaly
- Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt
- Department of Chemistry, Faculty of Applied Science, Umm Al-Qura University, Makkah Almukkarramah, Saudi Arabia
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13
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Bharti R, Bal Reddy C, Kumar S, Das P. Supported palladium nanoparticle‐catalysed Suzuki–Miyaura cross‐coupling approach for synthesis of aminoarylbenzosuberene analogues from natural precursor. Appl Organomet Chem 2017. [DOI: 10.1002/aoc.3749] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Richa Bharti
- Natural Product Chemistry and Process Development DivisionCSIR‐Institute of Himalayan Bioresource Technology Palampur 176061 HP India
- Academy of Scientific and Innovative Research (AcSIR) New Delhi India
| | - C. Bal Reddy
- Natural Product Chemistry and Process Development DivisionCSIR‐Institute of Himalayan Bioresource Technology Palampur 176061 HP India
- Academy of Scientific and Innovative Research (AcSIR) New Delhi India
| | - Sandeep Kumar
- Natural Product Chemistry and Process Development DivisionCSIR‐Institute of Himalayan Bioresource Technology Palampur 176061 HP India
- Academy of Scientific and Innovative Research (AcSIR) New Delhi India
| | - Pralay Das
- Natural Product Chemistry and Process Development DivisionCSIR‐Institute of Himalayan Bioresource Technology Palampur 176061 HP India
- Academy of Scientific and Innovative Research (AcSIR) New Delhi India
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14
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Design, synthesis, and biological evaluation of cyclic-indole derivatives as anti-tumor agents via the inhibition of tubulin polymerization. Eur J Med Chem 2017; 125:663-675. [DOI: 10.1016/j.ejmech.2016.09.056] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 08/26/2016] [Accepted: 09/18/2016] [Indexed: 12/16/2022]
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15
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Herdman CA, Strecker TE, Tanpure RP, Chen Z, Winters A, Gerberich J, Liu L, Hamel E, Mason RP, Chaplin DJ, Trawick ML, Pinney KG. Synthesis and Biological Evaluation of Benzocyclooctene-based and Indene-based Anticancer Agents that Function as Inhibitors of Tubulin Polymerization. MEDCHEMCOMM 2016; 7:2418-2427. [PMID: 28217276 PMCID: PMC5308454 DOI: 10.1039/c6md00459h] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The natural products colchicine and combretastatin A-4 (CA4) have been inspirational for the design and synthesis of structurally related analogues and spin-off compounds as inhibitors of tubulin polymerization. The discovery that a water-soluble phosphate prodrug salt of CA4 (referred to as CA4P) is capable of imparting profound and selective damage to tumor-associated blood vessels paved the way for the development of a new therapeutic approach for cancer treatment utilizing small-molecule inhibitors of tubulin polymerization that also act as vascular disrupting agents (VDAs). Combination of salient structural features associated with colchicine and CA4 led to the design and synthesis of a variety of fused aryl-cycloalkyl and aryl-heterocyclic compounds that function as inhibitors of tubulin polymerization. Prominent among these compounds is a benzosuberene analogue (referred to as KGP18), which demonstrates sub-nM cytotoxicity against human cancer cell lines and functions (when administered as a water-soluble prodrug salt) as a VDA in mouse models. Structure activity relationship considerations led to the evaluation of benzocyclooctyl [6,8 fused] and indene [6,5 fused] ring systems. Four benzocyclooctene and four indene analogues were prepared and evaluated biologically. Three of the benzocyclooctene analogues were active as inhibitors of tubulin polymerization (IC50 < 5 μM), and benzocyclooctene phenol 23 was comparable to KGP18 in terms of potency. The analogous indene-based compound 31 also functioned as an inhibitor of tubulin polymerization (IC50 = 11 μM) with reduced potency. The most potent inhibitor of tubulin polymerization from this group was benzocyclooctene analogue 23, and it was converted to its water-soluble prodrug salt 24 to assess its potential as a VDA. Preliminary in vivo studies, which utilized the MCF7-luc-GFP-mCherry breast tumor in a SCID mouse model, demonstrated that treatment with 24 (120 mg/kg) resulted in significant vascular shutdown, as evidenced by bioluminescence imaging at 4 h post administration, and that the effect continued at both 24 and 48 h. Contemporaneous studies with CA4P, a clinically relevant VDA, were carried out as a positive control.
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Affiliation(s)
- Christine A Herdman
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Tracy E Strecker
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Rajendra P Tanpure
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Zhi Chen
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Alex Winters
- Prognostic Imaging Research Laboratory, Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9058, United States
| | - Jeni Gerberich
- Prognostic Imaging Research Laboratory, Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9058, United States
| | - Li Liu
- Prognostic Imaging Research Laboratory, Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9058, United States
| | - Ernest Hamel
- Screening Technologies Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, Frederick National Laboratory for Cancer Research, National Institutes of Health, Frederick, MD 21702, United States
| | - Ralph P Mason
- Prognostic Imaging Research Laboratory, Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9058, United States
| | - David J Chaplin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States; Mateon Therapeutics, Inc., 701 Gateway Boulevard, Suite 210, South San Francisco, California 94080, United States
| | - Mary Lynn Trawick
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Kevin G Pinney
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
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16
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Devkota L, Lin CM, Strecker TE, Wang Y, Tidmore JK, Chen Z, Guddneppanavar R, Jelinek CJ, Lopez R, Liu L, Hamel E, Mason RP, Chaplin DJ, Trawick ML, Pinney KG. Design, synthesis, and biological evaluation of water-soluble amino acid prodrug conjugates derived from combretastatin, dihydronaphthalene, and benzosuberene-based parent vascular disrupting agents. Bioorg Med Chem 2016; 24:938-956. [PMID: 26852340 DOI: 10.1016/j.bmc.2016.01.007] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Revised: 12/27/2015] [Accepted: 01/05/2016] [Indexed: 01/21/2023]
Abstract
Targeting tumor vasculature represents an intriguing therapeutic strategy in the treatment of cancer. In an effort to discover new vascular disrupting agents with improved water solubility and potentially greater bioavailability, various amino acid prodrug conjugates (AAPCs) of potent amino combretastatin, amino dihydronaphthalene, and amino benzosuberene analogs were synthesized along with their corresponding water-soluble hydrochloride salts. These compounds were evaluated for their ability to inhibit tubulin polymerization and for their cytotoxicity against selected human cancer cell lines. The amino-based parent anticancer agents 7, 8, 32 (also referred to as KGP05) and 33 (also referred to as KGP156) demonstrated potent cytotoxicity (GI50=0.11-40nM) across all evaluated cell lines, and they were strong inhibitors of tubulin polymerization (IC50=0.62-1.5μM). The various prodrug conjugates and their corresponding salts were investigated for cleavage by the enzyme leucine aminopeptidase (LAP). Four of the glycine water-soluble AAPCs (16, 18, 44 and 45) showed quantitative cleavage by LAP, resulting in the release of the highly cytotoxic parent drug, whereas partial cleavage (<10-90%) was observed for other prodrugs (15, 17, 24, 38 and 39). Eight of the nineteen AAPCs (13-16, 42-45) showed significant cytotoxicity against selected human cancer cell lines. The previously reported CA1-diamine analog and its corresponding hydrochloride salt (8 and 10, respectively) caused extensive disruption (at a concentration of 1.0μM) of human umbilical vein endothelial cells growing in a two-dimensional tubular network on matrigel. In addition, compound 10 exhibited pronounced reduction in bioluminescence (greater than 95% compared to saline control) in a tumor bearing (MDA-MB-231-luc) SCID mouse model 2h post treatment (80mg/kg), with similar results observed upon treatment (15mg/kg) with the glycine amino-dihydronaphthalene AAPC (compound 44). Collectively, these results support the further pre-clinical development of the most active members of this structurally diverse collection of water-soluble prodrugs as promising anticancer agents functioning through a mechanism involving vascular disruption.
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Affiliation(s)
- Laxman Devkota
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Chen-Ming Lin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Tracy E Strecker
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Yifan Wang
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Justin K Tidmore
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Zhi Chen
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Rajsekhar Guddneppanavar
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Christopher J Jelinek
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Ramona Lopez
- Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9058, United States
| | - Li Liu
- Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9058, United States
| | - Ernest Hamel
- Screening Technologies Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, Frederick National Laboratory for Cancer Research, National Institutes of Health, Frederick, MD 21702, United States
| | - Ralph P Mason
- Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9058, United States
| | - David J Chaplin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States.,OXiGENE Inc., 701 Gateway Boulevard, Suite 210, South San Francisco, California 94080, United States
| | - Mary Lynn Trawick
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Kevin G Pinney
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
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17
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Herdman CA, Devkota L, Lin CM, Niu H, Strecker TE, Lopez R, Liu L, George CS, Tanpure RP, Hamel E, Chaplin DJ, Mason RP, Trawick ML, Pinney KG. Structural interrogation of benzosuberene-based inhibitors of tubulin polymerization. Bioorg Med Chem 2015; 23:7497-520. [PMID: 26775540 PMCID: PMC4828293 DOI: 10.1016/j.bmc.2015.10.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Revised: 10/01/2015] [Accepted: 10/10/2015] [Indexed: 11/16/2022]
Abstract
The discovery of 3-methoxy-9-(30,40,50-trimethoxyphenyl)-6,7-dihydro-5H-benzo[7]annulen-4-ol (a benzosuberene-based analogue referred to as KGP18) was originally inspired by the natural products colchicine and combretastatin A-4 (CA4). The relative structural simplicity and ease of synthesis of KGP18, coupled with its potent biological activity as an inhibitor of tubulin polymerization and its cytotoxicity (in vitro) against human cancer cell lines, has resulted in studies focused on new analogue design and synthesis. Our goal was to probe the relationship of structure to function in this class of anticancer agents. A series of twenty-two new benzosuberene-based analogues of KGP18 was designed and synthesized. These compounds vary in their methoxylation pattern and separately incorporate trifluoromethyl groups around the pendant aryl ring for the evaluation of the effect of functional group modifications on the fused six-membered aromatic ring. In addition, the 8,9-saturated congener of KGP18 has been synthesized to assess the necessity of unsaturation at the carbon atom bearing the pendant aryl ring. Six of the molecules from this benzosuberene-series of compounds were active (IC50 < 5 lM) as inhibitors of tubulin polymerization while four analogues were comparable (IC50 approximately 1 lM) in their tubulin inhibitory activity to CA4 and KGP18. The potency of a bis-trifluoromethyl analogue 74 and the unsaturated KGP18 derivative 73 as inhibitors of tubulin assembly along with their moderate cytotoxicity suggested the potential utility of these compounds as vascular disrupting agents (VDAs) to selectively target microvessels feeding tumors. Accordingly, water-soluble and DMSO-soluble phosphate prodrug salts of each were synthesized for preliminary in vivo studies to assess their potential efficacy as VDAs.
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Affiliation(s)
- Christine A. Herdman
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Laxman Devkota
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Chen-Ming Lin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Haichan Niu
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Tracy E. Strecker
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Ramona Lopez
- Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9058, United States
| | - Li Liu
- Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9058, United States
| | - Clinton S. George
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Rajendra P. Tanpure
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Ernest Hamel
- Screening Technologies Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, Frederick National Laboratory for Cancer Research, National Institutes of Health, Frederick, MD 21702, United States
| | - David J. Chaplin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
- OXiGENE Inc., 701 Gateway Boulevard, Suite 210, South San Francisco, California 94080, United States
| | - Ralph P. Mason
- Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9058, United States
| | - Mary Lynn Trawick
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Kevin G. Pinney
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
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18
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Behbehani H, Ibrahim HM, Dawood KM. Ultrasound-assisted regio- and stereoselective synthesis of bis-[1′,4′-diaryl-1-oxo-spiro-benzosuberane-2,5′-pyrazoline] derivatives via 1,3-dipolar cycloaddition. RSC Adv 2015. [DOI: 10.1039/c5ra02972d] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
A novel bis-[spiro-benzosuberane-2,5′-pyrazoline] derivatives were synthesized via 1,3-dipolar cycloaddition under ultrasonic irradiation.
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Affiliation(s)
| | | | - Kamal M. Dawood
- Chemistry Department
- Faculty of Science
- Kuwait University
- Kuwait
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19
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Recent developments in tubulin polymerization inhibitors: An overview. Eur J Med Chem 2014; 87:89-124. [DOI: 10.1016/j.ejmech.2014.09.051] [Citation(s) in RCA: 210] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Revised: 09/11/2014] [Accepted: 09/14/2014] [Indexed: 12/11/2022]
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20
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Tanpure RP, George CS, Strecker TE, Devkota L, Tidmore JK, Lin CM, Herdman CA, MacDonough MT, Sriram M, Chaplin DJ, Trawick ML, Pinney KG. Synthesis of structurally diverse benzosuberene analogues and their biological evaluation as anti-cancer agents. Bioorg Med Chem 2013; 21:8019-32. [PMID: 24183586 PMCID: PMC3968794 DOI: 10.1016/j.bmc.2013.08.035] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 08/10/2013] [Accepted: 08/18/2013] [Indexed: 11/28/2022]
Abstract
Diversely functionalized, fused aryl-alkyl ring systems hold a prominent position as well-established molecular frameworks for a variety of anti-cancer agents. The benzosuberene (6,7 fused, also referred to as dihydro-5H-benzo[7]annulene and benzocycloheptene) ring system has emerged as a valuable molecular core component for the development of inhibitors of tubulin assembly, which function as antiproliferative anti-cancer agents and, in certain cases, as vascular disrupting agents (VDAs). Both a phenolic-based analogue (known as KGP18, compound 39) and its corresponding amine-based congener (referred to as KGP156, compound 45), which demonstrate strong inhibition of tubulin assembly (low micromolar range) and potent cytotoxicity (picomolar range for KGP18 and nanomolar range for KGP156) are noteworthy examples of such benzosuberene-based compounds. In order to extend the structure-activity relationship (SAR) knowledge base related to benzosuberene anti-cancer agents, a series of eleven analogues (including KGP18) were prepared in which the methoxylation pattern on the pendant aryl ring as well as functional group incorporation on the fused aryl ring were varied. The synthetic approach to these compounds featured a sequential Wittig olefination, reduction, Eaton's reagent-mediated cyclization strategy to achieve the core benzosuberone intermediate, and represented a higher-yielding synthesis of KGP18 (which we prepared previously through a ring-expansion strategy). Incorporation of a fluorine or chlorine atom at the 1-position of the fused aryl ring or replacement of one of the methoxy groups with hydrogen (on the pendant aryl ring of KGP18) led to benzosuberene analogues that were both strongly inhibitory against tubulin assembly (IC50 approximately 1.0 μM) and strongly cytotoxic against selected human cancer cell lines (for example, GI50=5.47 nM against NCI-H460 cells with fluoro-benzosuberene analogue 37). A water-soluble phosphate prodrug salt of KGP18 (referred to as KGP265, compound 44) and a water-soluble serinamide salt (compound 48) of KGP156 were also synthesized and evaluated in this study.
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Affiliation(s)
- Rajendra P. Tanpure
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Clinton S. George
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Tracy E. Strecker
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Laxman Devkota
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Justin K. Tidmore
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Chen-Ming Lin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Christine A. Herdman
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Matthew T. MacDonough
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Madhavi Sriram
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - David J. Chaplin
- OXiGENE Inc., 701 Gateway Boulevard, Suite 210, South San Francisco, California 94080, United States
| | - Mary Lynn Trawick
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
| | - Kevin G. Pinney
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798-7348, United States
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21
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Chen Z, Maderna A, Sukuru SCK, Wagenaar M, O'Donnell CJ, Lam MH, Musto S, Loganzo F. New cytotoxic benzosuberene analogs. Synthesis, molecular modeling and biological evaluation. Bioorg Med Chem Lett 2013; 23:6688-94. [PMID: 24210503 DOI: 10.1016/j.bmcl.2013.10.039] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Revised: 10/17/2013] [Accepted: 10/21/2013] [Indexed: 11/16/2022]
Abstract
In this Letter we describe the synthesis and biological evaluation of new benzosuberene analogs with structural modifications on the B-ring. The focus was initially to probe the chemical space around the B-ring C-8 position. This position was readily available for derivatization chemistry using our recently developed new synthesis for this compound class. Furthermore, we describe two new B-ring analogs, one containing a diene and the other a cyclic ether group. Both new analogs show excellent potencies in tumor cell proliferation assays. In addition, we describe molecular modeling studies that provide a binding rationale for reference compound 8 in the colchicine binding site using the known colchicine crystal structure. We also examine whether the cell based potency data obtained with selected new analogs are supported by modeling results.
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Affiliation(s)
- Zecheng Chen
- Pfizer World Wide Research and Development, World Wide Medicinal Chemistry, Oncology Eastern Point Road, Groton, CT 06340, United States
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