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Slowik EJ, Stankoska K, Bui NN, Pasieka B, Conrad D, Zapp J, Hoth M, Bogeski I, Kappl R. The calcium channel modulator 2-APB hydrolyzes in physiological buffers and acts as an effective radical scavenger and inhibitor of the NADPH oxidase 2. Redox Biol 2023; 61:102654. [PMID: 36889081 PMCID: PMC10009725 DOI: 10.1016/j.redox.2023.102654] [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: 12/28/2022] [Revised: 02/20/2023] [Accepted: 03/02/2023] [Indexed: 03/06/2023] Open
Abstract
2-aminoethoxydiphenyl borate (2-APB) is commonly used as a tool to modulate calcium signaling in physiological studies. 2-APB has a complex pharmacology and acts as activator or inhibitor of a variety of Ca2+ channels and transporters. While unspecific, 2-APB is one of the most-used agents to modulate store-operated calcium entry (SOCE) mediated by the STIM-gated Orai channels. Due to its boron core structure, 2-APB tends to readily hydrolyze in aqueous environment, a property that results in a complex physicochemical behavior. Here, we quantified the degree of hydrolysis in physiological conditions and identified the hydrolysis products diphenylborinic acid and 2-aminoethanol by NMR. Notably, we detected a high sensitivity of 2-APB/diphenylborinic acid towards decomposition by hydrogen peroxide to compounds such as phenylboronic acid, phenol, and boric acid, which were, in contrast to 2-APB itself and diphenylborinic acid, insufficient to affect SOCE in physiological experiments. Consequently, the efficacy of 2-APB as a Ca2+ signal modulator strongly depends on the reactive oxygen species (ROS) production within the experimental system. The antioxidant behavior of 2-APB towards ROS and its resulting decomposition are inversely correlated to its potency to modulate Ca2+ signaling as shown by electron spin resonance spectroscopy (ESR) and Ca2+ imaging. Finally, we observed a strong inhibitory effect of 2-APB, i.e., its hydrolysis product diphenylborinic acid, on NADPH oxidase (NOX2) activity in human monocytes. These new 2-APB properties are highly relevant for Ca2+ and redox signaling studies and for pharmacological application of 2-APB and related boron compounds.
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Affiliation(s)
- Ewa Jasmin Slowik
- Department of Biophysics, Faculty of Medicine, Center for Integrative Physiology and Molecular Medicine (CIPMM), Saarland University, 66421, Homburg, Germany
| | - Katerina Stankoska
- Department of Biophysics, Faculty of Medicine, Center for Integrative Physiology and Molecular Medicine (CIPMM), Saarland University, 66421, Homburg, Germany
| | - Nhat Nguyen Bui
- Department of Biophysics, Faculty of Medicine, Center for Integrative Physiology and Molecular Medicine (CIPMM), Saarland University, 66421, Homburg, Germany
| | - Bastian Pasieka
- Department of Biophysics, Faculty of Medicine, Center for Integrative Physiology and Molecular Medicine (CIPMM), Saarland University, 66421, Homburg, Germany
| | - David Conrad
- Department of Biophysics, Faculty of Medicine, Center for Integrative Physiology and Molecular Medicine (CIPMM), Saarland University, 66421, Homburg, Germany; Department of Anaesthesiology, Intensive Care and Pain Therapy, Saarland University Medical Center, Saarland University Faculty of Medicine, 66421, Homburg, Germany
| | - Josef Zapp
- Department of Pharmaceutical Biology, Saarland University, 66123, Saarbrücken, Germany
| | - Markus Hoth
- Department of Biophysics, Faculty of Medicine, Center for Integrative Physiology and Molecular Medicine (CIPMM), Saarland University, 66421, Homburg, Germany
| | - Ivan Bogeski
- Molecular Physiology, Department of Cardiovascular Physiology, UMG, 37073, Göttingen, Germany
| | - Reinhard Kappl
- Department of Biophysics, Faculty of Medicine, Center for Integrative Physiology and Molecular Medicine (CIPMM), Saarland University, 66421, Homburg, Germany.
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Boyet M, Chabaud L, Pucheault M. Recent Advances in the Synthesis of Borinic Acid Derivatives. Molecules 2023; 28:molecules28062660. [PMID: 36985634 PMCID: PMC10057197 DOI: 10.3390/molecules28062660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 03/03/2023] [Accepted: 03/08/2023] [Indexed: 03/18/2023] Open
Abstract
Borinic acids [R2B(OH)] and their chelate derivatives are a subclass of organoborane compounds used in cross-coupling reactions, catalysis, medicinal chemistry, polymer or optoelectronics materials. In this paper, we review the recent advances in the synthesis of diarylborinic acids and their four-coordinated analogs. The main strategies to build up borinic acids rely either on the addition of organometallic reagents to boranes (B(OR)3, BX3, aminoborane, arylboronic esters) or the reaction of triarylboranes with a ligand (diol, amino alcohol, etc.). After general practical considerations of borinic acids, an overview of the main synthetic methods, their scope and limitations is provided. We also discuss some mechanistic aspects.
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Liang X, Zhang N, Pan H, Xie J, Han W. Development of Store-Operated Calcium Entry-Targeted Compounds in Cancer. Front Pharmacol 2021; 12:688244. [PMID: 34122115 PMCID: PMC8194303 DOI: 10.3389/fphar.2021.688244] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 05/17/2021] [Indexed: 11/17/2022] Open
Abstract
Store-operated Ca2+ entry (SOCE) is the major pathway of Ca2+ entry in mammalian cells, and regulates a variety of cellular functions including proliferation, motility, apoptosis, and death. Accumulating evidence has indicated that augmented SOCE is related to the generation and development of cancer, including tumor formation, proliferation, angiogenesis, metastasis, and antitumor immunity. Therefore, the development of compounds targeting SOCE has been proposed as a potential and effective strategy for use in cancer therapy. In this review, we summarize the current research on SOCE inhibitors and blockers, discuss their effects and possible mechanisms of action in cancer therapy, and induce a new perspective on the treatment of cancer.
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Affiliation(s)
- Xiaojing Liang
- Department of Medical Oncology, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Ningxia Zhang
- Department of Medical Oncology, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Hongming Pan
- Department of Medical Oncology, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Jiansheng Xie
- Department of Medical Oncology, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou, China.,Laboratory of Cancer Biology, Institute of Clinical Science, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Weidong Han
- Department of Medical Oncology, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou, China
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4
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Synthesis and Pharmacological Characterization of 2-Aminoethyl Diphenylborinate (2-APB) Derivatives for Inhibition of Store-Operated Calcium Entry (SOCE) in MDA-MB-231 Breast Cancer Cells. Int J Mol Sci 2020; 21:ijms21165604. [PMID: 32764353 PMCID: PMC7460636 DOI: 10.3390/ijms21165604] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 07/31/2020] [Accepted: 08/03/2020] [Indexed: 12/15/2022] Open
Abstract
Calcium ions regulate a wide array of physiological functions including cell differentiation, proliferation, muscle contraction, neurotransmission, and fertilization. The endoplasmic reticulum (ER) is the major intracellular Ca2+ store and cellular events that induce ER store depletion (e.g., activation of inositol 1,4,5-triphosphate (IP3) receptors) trigger a refilling process known as store-operated calcium entry (SOCE). It requires the intricate interaction between the Ca2+ sensing stromal interaction molecules (STIM) located in the ER membrane and the channel forming Orai proteins in the plasma membrane (PM). The resulting active STIM/Orai complexes form highly selective Ca2+ channels that facilitate a measurable Ca2+ influx into the cytosol followed by successive refilling of the ER by the sarcoplasmic/endoplasmic reticulum calcium ATPase (SERCA). STIM and Orai have attracted significant therapeutic interest, as enhanced SOCE has been associated with several cancers, and mutations in STIM and Orai have been linked to immunodeficiency, autoimmune, and muscular diseases. 2-Aminoethyl diphenylborinate (2-APB) is a known modulator and depending on its concentration can inhibit or enhance SOCE. We have synthesized several novel derivatives of 2-APB, introducing halogen and other small substituents systematically on each position of one of the phenyl rings. Using a fluorometric imaging plate reader (FLIPR) Tetra-based calcium imaging assay we have studied how these structural changes of 2-APB affect the SOCE modulation activity at different compound concentrations in MDA-MB-231 breast cancer cells. We have discovered 2-APB derivatives that block SOCE at low concentrations, at which 2-APB usually enhances SOCE.
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Viswanathan A, Sebastianelli G, Brown K, Raunio J, Sipilä V, Yli-Harja O, Candeias NR, Kandhavelu M. In vitro anti-glioblastoma activity of L-valine derived boroxazolidones. Eur J Pharmacol 2019; 854:194-200. [PMID: 30981767 DOI: 10.1016/j.ejphar.2019.04.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 04/05/2019] [Accepted: 04/08/2019] [Indexed: 10/27/2022]
Abstract
In the present study, a series of L-valine derived boroxazolidones, previously synthesized and reported to have residual activity in a human epithelial cell line, have been evaluated in vitro for their anti-glioblastoma activity. A boroxazolidone derivative containing 2,4-difluorophenyl moieties (6) was found to have higher cytotoxicity than the standard drug, Temozolomide (TMZ). Compound 6 was found to exhibit dose-dependent growth inhibitory effects with an IC50 of 49 μM and 53 μM for LN229 and SNB19 cells, respectively. Additionally, 6 was assessed for its role in apoptosis, caspase 3/7 activation and oxidative stress in SNB19 and LN229 cells. SNB19 cells treated with 6 showed 45.3% apoptosis in the population, while TMZ had 24.7%. In LN229 cells, the percentage of apoptotic cells treated with compound 6 and TMZ were the same. Both 6 and TMZ induced apoptosis through the activation of caspase 3/7 in SNB19 and LN229 cells. Interestingly, 6 exhibited a higher effectivity in promoting reactive oxygen species production in LN229, while it was 6-fold less in SNB19. Boroxazolidone-treated GBM cell lines increased reactive oxygen species production, suggesting that such species may be interlinked with the observed programmed cell death. Additionally, the treatment of both GBM cell lines with 6 led to G2/M phase arrest. The magnitude of anti-GBM effect of 6 is significantly higher than the known chemotherapeutic agent TMZ. This work further demonstrates the anticancer properties of L-valine derived boroxazolidones, adding another potential derivative to the collection of promising chemotherapeutic agents for GBM treatment.
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Affiliation(s)
- Anisha Viswanathan
- Molecular Signaling Lab, Faculty of Medicine and Health Technology, Tampere University and BioMediTech, P.O. Box 553, 33101 Tampere, Finland
| | - Giulia Sebastianelli
- Molecular Signaling Lab, Faculty of Medicine and Health Technology, Tampere University and BioMediTech, P.O. Box 553, 33101 Tampere, Finland
| | - Kenna Brown
- Molecular Signaling Lab, Faculty of Medicine and Health Technology, Tampere University and BioMediTech, P.O. Box 553, 33101 Tampere, Finland
| | - Jenna Raunio
- Faculty of Engineering and Natural Sciences, Tampere University, Korkeakoulunkatu 8, 33101 Tampere, Finland
| | - Vili Sipilä
- Molecular Signaling Lab, Faculty of Medicine and Health Technology, Tampere University and BioMediTech, P.O. Box 553, 33101 Tampere, Finland
| | - Olli Yli-Harja
- Computational Systems Biology Group, Faculty of Medicine and Health Technology, Tampere University and BioMedi Tech, P.O. Box 553, 33101 Tampere, Finland; Institute for Systems Biology, 1441N 34th Street, Seattle, WA 98103-8904, USA
| | - Nuno R Candeias
- Faculty of Engineering and Natural Sciences, Tampere University, Korkeakoulunkatu 8, 33101 Tampere, Finland.
| | - Meenakshisundaram Kandhavelu
- Molecular Signaling Lab, Faculty of Medicine and Health Technology, Tampere University and BioMediTech, P.O. Box 553, 33101 Tampere, Finland.
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Romero-Aguilar KS, Arciniega-Martínez IM, Farfán-García ED, Campos-Rodríguez R, Reséndiz-Albor AA, Soriano-Ursúa MA. Effects of boron-containing compounds on immune responses: review and patenting trends. Expert Opin Ther Pat 2019; 29:339-351. [PMID: 31064237 DOI: 10.1080/13543776.2019.1612368] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
INTRODUCTION Boron-containing compounds induce effects on immune responses. Such effects are interesting to the biomedical field for the development of therapeutic tools to modulate the immune system. AREAS COVERED The scope of BCC use to modify immune responses is expanding, mainly with regard to inflammatory diseases. The information was organized to demonstrate the breadth of reported effects. BCCs act as modulators of innate and adaptive immunity, with the former including regulation of cluster differentiation and cytokine production. In addition, BCCs exert effects on inflammation induced by infectious and noninfectious agents, and there are also reports regarding their effects on mechanisms involving hypersensitivity and transplants. Finally, the authors discuss the beneficial effects of BCCs on pathologies involving various targets and mechanisms. EXPERT OPINION Some BCCs are currently used as drugs in humans. The mechanisms by which these BCCs modulate immune responses, as well as the required structure-activity relationship for each observed mechanism of action, should be clarified. The former will allow for the development of improved immunomodulatory drugs with extensive applications in medicine. Patenting trends involve claims concerning the synthesis and actions of identified molecules with a defined profile regarding cytokines, cell differentiation, proliferation, and antibody production.
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Affiliation(s)
- Karla S Romero-Aguilar
- a Departamento de Fisiología, Sección de Estudios de Posgrado e Investigación , Escuela Superior de Medicina del Instituto Politécnico Nacional , México City , México
- b Departamento de Inmunología de Mucosas, Sección de Estudios de Posgrado e Investigación , Escuela Superior de Medicina del Instituto Politécnico Nacional , México City , México
| | - Ivonne M Arciniega-Martínez
- b Departamento de Inmunología de Mucosas, Sección de Estudios de Posgrado e Investigación , Escuela Superior de Medicina del Instituto Politécnico Nacional , México City , México
| | - Eunice D Farfán-García
- a Departamento de Fisiología, Sección de Estudios de Posgrado e Investigación , Escuela Superior de Medicina del Instituto Politécnico Nacional , México City , México
| | - Rafael Campos-Rodríguez
- b Departamento de Inmunología de Mucosas, Sección de Estudios de Posgrado e Investigación , Escuela Superior de Medicina del Instituto Politécnico Nacional , México City , México
| | - Aldo A Reséndiz-Albor
- b Departamento de Inmunología de Mucosas, Sección de Estudios de Posgrado e Investigación , Escuela Superior de Medicina del Instituto Politécnico Nacional , México City , México
| | - Marvin A Soriano-Ursúa
- a Departamento de Fisiología, Sección de Estudios de Posgrado e Investigación , Escuela Superior de Medicina del Instituto Politécnico Nacional , México City , México
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7
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Xia K, Ma Z, Shen J, Li M, Hou B, Gao M, Zhang S, Wu J. The 2-aminoethoxydiphenyl borate analog, DPB161 blocks store-operated Ca 2+ entry in acutely dissociated rat submandibular cells. Oncotarget 2017; 8:61551-61560. [PMID: 28977884 PMCID: PMC5617444 DOI: 10.18632/oncotarget.18623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2017] [Accepted: 05/06/2017] [Indexed: 02/05/2023] Open
Abstract
Cellular Ca2+ signals play a critical role in cell physiology and pathology. In most non-excitable cells, store-operated Ca2+ entry (SOCE) is an important mechanism by which intracellular Ca2+ signaling is regulated. However, few drugs can selectively modulate SOCE. 2-Aminoethoxydiphenyl borate (2APB) and its analogs (DPB162 and DPB163) have been reported to inhibit SOCE. Here, we examined the effects of another 2-APB analog, DPB161 on SOCE in acutely-isolated rat submandibular cells. Both patch-clamp recordings and Ca2+ imaging showed that upon removal of extracellular Ca2+ ([Ca2+]o=0), rat submandibular cells were unable to maintain ACh-induced Ca2+ oscillations, but restoration of [Ca2+]o to refill Ca2+ stores enable recovery of these Ca2+ oscillations. However, addition of 50 μM DPB161 with [Ca2+]o to extracellular solution prevented the refilling of Ca2+ store. Fura-2 Ca2+ imaging showed that DPB161 inhibited SOCE in a concentration-dependent manner. After depleting Ca2+ stores by thapsigargin treatment, bath perfusion of 1 mM Ca2+ induced [Ca2+]i elevation in a manner that was prevented by DPB161. Collectively, these results show that the 2-APB analog DPB161 blocks SOCE in rat submandibular cells, suggesting that this compound can be developed as a pharmacological tool for the study of SOCE function and as a new therapeutic agent for treating SOCE-associated disorders.
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Affiliation(s)
- Kunkun Xia
- Department of Hepatobiliary and Pancreatic Surgery, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.,Department of Neurobiology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, USA
| | - Zegang Ma
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, Shandong Provincial Collaborative Innovation Center for Neurodegenerative Disorders and State Key Disciplines, Physiology, Medical College of Qingdao University, Qingdao, China.,Department of Neurobiology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, USA
| | - Jianxin Shen
- Department of Physiology, Shantou University Medical College, Shantou, China
| | - Menghan Li
- Department of Physiology, Shantou University Medical College, Shantou, China
| | - Baoke Hou
- Department of Neurobiology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, USA
| | - Ming Gao
- Department of Neurobiology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, USA
| | - Shuijun Zhang
- Department of Hepatobiliary and Pancreatic Surgery, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Jie Wu
- Department of Hepatobiliary and Pancreatic Surgery, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.,Department of Neurobiology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, USA.,Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, Shandong Provincial Collaborative Innovation Center for Neurodegenerative Disorders and State Key Disciplines, Physiology, Medical College of Qingdao University, Qingdao, China.,Department of Physiology, Shantou University Medical College, Shantou, China
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Potentiation of the store-operated calcium entry (SOCE) induces phytohemagglutinin-activated Jurkat T cell apoptosis. Cell Calcium 2015; 58:171-85. [PMID: 25963393 DOI: 10.1016/j.ceca.2015.04.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 04/14/2015] [Accepted: 04/16/2015] [Indexed: 01/12/2023]
Abstract
Store-operated Ca(2+) entry (SOCE) is the main Ca(2+) entry pathway of non-excitable cells. In the past decade, the activation of this entry has been unveiled, with STIM1, a protein of the endoplasmic reticulum able to sense the intraluminal Ca(2+) content, and Orai1, the pore-forming unit of the Ca(2+) release activated Ca(2+) (CRAC) channels. When Ca(2+) ions are released from the endoplasmic reticulum, STIM1 proteins oligomerize and directly interact with Orai1 proteins, allowing the opening of the CRAC channels and a massive Ca(2+) ion influx known as SOCE. As Ca(2+) is involved in various cellular processes, the discovery of new drugs acting on the SOCE should be of interest to control the cell activity. By testing analogs of 2-aminoethyl diphenylborinate (2-APB), a well known, though not so selective effector of the SOCE, we identified methoxy diethylborinate (MDEB), a molecule able to potentiate the SOCE in three leukocyte and two breast cancer cell lines by increasing the Ca(2+) influx amplitude. Unlike 2-APB, MDEB does not affect the Ca(2+) pumps or the Ca(2+) release from the endoplasmic reticulum. MDEB could therefore represent the first member of a new group of molecules, specifically able to potentiate SOCE. Although not toxic for non-activated Jurkat T cells, it could induce the apoptosis of phytohemagglutinin-stimulated cells.
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9
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2-Aminoethyl diphenylborinate (2-APB) analogues: regulation of Ca2+ signaling. Biochem Biophys Res Commun 2013; 441:286-90. [PMID: 24036266 DOI: 10.1016/j.bbrc.2013.08.102] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Accepted: 08/30/2013] [Indexed: 11/24/2022]
Abstract
In order to obtain compounds with modified 2-APB activities, we synthesized number of 2-APB analogues and analyzed their inhibitory activities for SOCE. The IC50 of 2-APB for SOCE inhibition is 3 μM while IC50 of some of our 2-APB analogues range 0.1-10 μM. The adducts of amino acids with diphenyl borinic acid have strong inhibitory activities. By using these compounds, we will be able to regulate intracellular Ca(2+) concentration and consequent cellular processes more efficiently than with 2-APB.
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10
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Hofer A, Kovacs G, Zappatini A, Leuenberger M, Hediger MA, Lochner M. Design, synthesis and pharmacological characterization of analogs of 2-aminoethyl diphenylborinate (2-APB), a known store-operated calcium channel blocker, for inhibition of TRPV6-mediated calcium transport. Bioorg Med Chem 2013; 21:3202-13. [PMID: 23602525 DOI: 10.1016/j.bmc.2013.03.037] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Revised: 03/07/2013] [Accepted: 03/14/2013] [Indexed: 10/27/2022]
Abstract
2-Aminoethyl diphenylborinate (2-APB) is a known modulator of the IP3 receptor, the calcium ATPase SERCA, the calcium release-activated calcium channel Orai and TRP channels. More recently, it was shown that 2-APB is an efficient inhibitor of the epithelial calcium channel TRPV6 which is overexpressed in prostate cancer. We have conducted a structure-activity relationship study of 2-APB congeners to understand their inhibitory mode of action on TRPV6. Whereas modifying the aminoethyl moiety did not significantly change TRPV6 inhibition, substitution of the phenyl rings of 2-APB did. Our data show that the diaryl borinate moiety is required for biological activity and that the substitution pattern of the aryl rings can influence TRPV6 versus SOCE inhibition. We have also discovered that 2-APB is hydrolyzed and transesterified within minutes in solution.
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Affiliation(s)
- Alexandre Hofer
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
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11
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Zimmermann TJ, Bürger M, Tashiro E, Kondoh Y, Martinez NE, Görmer K, Rosin-Steiner S, Shimizu T, Ozaki S, Mikoshiba K, Watanabe N, Hall D, Vetter IR, Osada H, Hedberg C, Waldmann H. Boron-Based Inhibitors of Acyl Protein Thioesterases 1 and 2. Chembiochem 2012; 14:115-22. [DOI: 10.1002/cbic.201200571] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Indexed: 11/08/2022]
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12
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Wesela-Bauman G, Jastrzębski L, Kurach P, Luliński S, Serwatowski J, Woźniak K. Synthesis of functionalized diarylborinic 8-oxyquinolates via bimetallic boron–lithium intermediates. J Organomet Chem 2012. [DOI: 10.1016/j.jorganchem.2012.03.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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13
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Bauer PO, Hudec R, Ozaki S, Okuno M, Ebisui E, Mikoshiba K, Nukina N. Genetic ablation and chemical inhibition of IP3R1 reduce mutant huntingtin aggregation. Biochem Biophys Res Commun 2011; 416:13-7. [DOI: 10.1016/j.bbrc.2011.10.096] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2011] [Accepted: 10/21/2011] [Indexed: 11/30/2022]
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14
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Dellis O, Mercier P, Chomienne C. The boron-oxygen core of borinate esters is responsible for the store-operated calcium entry potentiation ability. BMC Pharmacol 2011; 11:1. [PMID: 21266088 PMCID: PMC3036632 DOI: 10.1186/1471-2210-11-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2010] [Accepted: 01/26/2011] [Indexed: 08/23/2023] Open
Abstract
Background Store-Operated Calcium Entry (SOCE) is the major Ca2+ ion entry pathway in lymphocytes and is responsible of a severe combined immunodeficiency (SCID) when deficient. It has recently been observed or highlighted in other cell types such as myoblasts and neurons, suggesting a wider physiological role of this pathway. Whereas Orai1 protein is considered to be the channel allowing the SOCE in T cells, it is hypothesized that other proteins like TRPC could associate with Orai1 to form SOCE with different pharmacology and kinetics in other cell types. Unraveling SOCE cell functions requires specific effectors to be identified, just as dihydropyridines were crucial for the study of Ca2+ voltage-gated channels, or spider/snake toxins for other ion channel classes. To identify novel SOCE effectors, we analyzed the effects of 2-aminoethyl diphenylborinate (2-APB) and its analogues. 2-APB is a molecule known to both potentiate and inhibit T cell SOCE, but it is also an effector of TRP channels and endoplasmic reticulum Ca2+-ATPase. Results A structure-function analysis allowed to discover that the boron-oxygen core present in 2-APB and in the borinate ester analogues is absolutely required for the dual effects on SOCE. Indeed, a 2-APB analogue where the boron-oxygen core is replaced by a carbon-phosphorus core is devoid of potentiating capacity (while retaining inhibition capacity), highlighting the key role of the boron-oxygen core present in borinate esters for the potentiation function. However, dimesityl borinate ester, a 2-APB analogue with a terminal B-OH group showed an efficient inhibitory ability, without any potentiating capacity. The removal or addition of phenyl groups respectively decrease or increase the efficiency of the borinate esters to potentiate and inhibit the SOCE. mRNA expression revealed that Jurkat T cells mainly expressed Orai1, and were the more sensitive to 2-APB modulation of SOCE. Conclusions This study allows the discovery of new boron-oxygen core containing compounds with the same ability as 2-APB to both potentiate and inhibit the SOCE of different leukocyte cell lines. These compounds could represent new tools to characterize the different types of SOCE and the first step in the development of new immunomodulators.
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Affiliation(s)
- Olivier Dellis
- INSERM UMR-S 940, Institut Universitaire d'Hématologie - Université Denis Diderot Paris 7, Hôpital Saint Louis, Paris, France.
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15
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Abstract
Store-operated calcium entry is a process by which the depletion of calcium from the endoplasmic reticulum activates calcium influx across the plasma membrane. In the past few years, the major players in this pathway have been identified. STIM1 and STIM2 function as calcium sensors in the endoplasmic reticulum and can interact with and activate plasma membrane channels comprised of Orai1, Orai2, or Orai3 subunits. This review discusses recent advances in our understanding of this widespread signaling mechanism as well as the mechanisms by which a number of interesting pharmacological agents modify it.
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Affiliation(s)
- James W Putney
- Calcium Regulation Section, National Institute of Environmental Health Sciences - NIH, Department of Health and Human Services, PO Box 12233, Research Triangle Park, NC 27709, USA.
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