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Määttä A, Nixon R, Robinson N, Ambler CA, Goncalves K, Maltman V, Przyborski S. Regulation of epidermal proliferation and hair follicle cycling by synthetic photostable retinoid EC23. J Cosmet Dermatol 2023; 22:1658-1669. [PMID: 36718827 DOI: 10.1111/jocd.15629] [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: 10/06/2022] [Revised: 12/22/2022] [Accepted: 01/03/2023] [Indexed: 02/01/2023]
Abstract
BACKGROUND Retinoid signaling is an important regulator of the epidermis and skin appendages. Therefore, synthetic retinoids have been developed for therapeutic use for skin disorders such as psoriasis and acne. AIMS In previous studies, we showed how the photostable retinoid EC23 induces neuronal differentiation in stem cell-like cell populations, and here, we aim to investigate its ability to influence epidermal and hair follicle growth. METHODS EC23 influence on skin biology was investigated initially in cultures of monolayer keratinocytes and three-dimentional in vitro models of skin, and finally in in vivo studies of mice back skin. RESULTS EC23 induces keratinocyte hyperproliferation in vitro and in vivo, and when applied to mouse skin increases the number of involucrin-positive suprabasal cell layers. These phenotypic changes are similar in skin treated with the natural retinoid all-trans retinoic acid (ATRA); however, EC23 is more potent; a tenfold lower dose of EC23 is sufficient to induce epidermal thickening, and resulting hyperproliferation is sustained for a longer time period after first dose. EC23 treatment resulted in a disorganized stratum corneum, reduced cell surface lipids and compromised barrier, similar to ATRA treatment. However, EC23 induces a rapid telogen to anagen transition and hair re-growth in 6-week-old mice with synchronously resting back skin follicles. The impact of EC23 on the hair cycle was surprising as similar results have not been seen with ATRA. CONCLUSIONS These data suggest that synthetic retinoid EC23 is a useful tool in exploring the turnover and differentiation of cells and has a potent effect on skin physiology.
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Affiliation(s)
- Arto Määttä
- Department of Biosciences, Durham University, Durham, UK
| | - Rebecca Nixon
- Department of Biosciences, Durham University, Durham, UK
| | - Neil Robinson
- Department of Biosciences, Durham University, Durham, UK
| | | | | | | | - Stefan Przyborski
- Department of Biosciences, Durham University, Durham, UK.,Reprocell Europe Ltd, West of Scotland Science Park, Glasgow, UK
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2
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Abdelaal MR, Ibrahim E, Elnagar MR, Soror SH, Haffez H. Augmented Therapeutic Potential of EC-Synthetic Retinoids in Caco-2 Cancer Cells Using an In Vitro Approach. Int J Mol Sci 2022; 23:ijms23169442. [PMID: 36012706 PMCID: PMC9409216 DOI: 10.3390/ijms23169442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Revised: 07/29/2022] [Accepted: 08/05/2022] [Indexed: 11/16/2022] Open
Abstract
Colorectal cancer therapies have produced promising clinical responses, but tumor cells rapidly develop resistance to these drugs. It has been previously shown that EC19 and EC23, two EC-synthetic retinoids, have single-agent preclinical anticancer activity in colorectal carcinoma. Here, isobologram analysis revealed that they have synergistic cytotoxicity with retinoic acid receptor (RAR) isoform-selective agonistic retinoids such as AC261066 (RARβ2-selective agonist) and CD437 (RARγ-selective agonist) in Caco-2 cells. This synergism was confirmed by calculating the combination index (lower than 1) and the dose reduction index (higher than 1). Flow cytometry of combinatorial IC50 (the concentration causing 50% cell death) confirmed the cell cycle arrest at the SubG0-G1 phase with potentiated apoptotic and necrotic effects. The reported synergistic anticancer activity can be attributed to their ability to reduce the expression of ATP-binding cassette (ABC) transporters including P-glycoprotein (P-gp1), breast cancer resistance protein (BCRP) and multi-drug resistance-associated protein-1 (MRP1) and Heat Shock Protein 70 (Hsp70). This adds up to the apoptosis-promoting activity of EC19 and EC23, as shown by the increased Caspase-3/7 activities and DNA fragmentation leading to DNA double-strand breaks. This study sheds the light on the possible use of EC-synthetic retinoids in the rescue of multi-drug resistance in colorectal cancer using Caco-2 as a model and suggests new promising combinations between different synthetic retinoids. The current in vitro results pave the way for future studies on these compounds as possible cures for colorectal carcinoma.
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Affiliation(s)
- Mohamed R. Abdelaal
- Biochemistry and Molecular Biology Department, Faculty of Pharmacy, Helwan University, Cairo 11795, Egypt
- Center of Scientific Excellence “Helwan Structural Biology Research, (HSBR)”, Helwan University, Cairo 11795, Egypt
| | - Esraa Ibrahim
- Biochemistry and Molecular Biology Department, Faculty of Pharmacy, Helwan University, Cairo 11795, Egypt
- Center of Scientific Excellence “Helwan Structural Biology Research, (HSBR)”, Helwan University, Cairo 11795, Egypt
| | - Mohamed R. Elnagar
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Al-Azhar University, Cairo 11823, Egypt
| | - Sameh H. Soror
- Biochemistry and Molecular Biology Department, Faculty of Pharmacy, Helwan University, Cairo 11795, Egypt
- Center of Scientific Excellence “Helwan Structural Biology Research, (HSBR)”, Helwan University, Cairo 11795, Egypt
| | - Hesham Haffez
- Biochemistry and Molecular Biology Department, Faculty of Pharmacy, Helwan University, Cairo 11795, Egypt
- Center of Scientific Excellence “Helwan Structural Biology Research, (HSBR)”, Helwan University, Cairo 11795, Egypt
- Correspondence: ; Tel.: +20-1094-970-173
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Svirsky SE, Ranellone NS, Parry M, Holets E, Henchir J, Li Y, Carlson SW, Edward Dixon C. All-trans Retinoic Acid has Limited Therapeutic Effects on Cognition and Hippocampal Protein Expression After Controlled Cortical Impact. Neuroscience 2022; 499:130-141. [PMID: 35878718 DOI: 10.1016/j.neuroscience.2022.07.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 07/15/2022] [Accepted: 07/18/2022] [Indexed: 10/17/2022]
Abstract
Traumatic brain injury (TBI) is known to impair synaptic function, and subsequently contribute to observed cognitive deficits. Retinoic Acid (RA) signaling modulates expression of synaptic plasticity proteins and is involved in hippocampal learning and memory. All trans-retinoic acid (ATRA), a metabolite of Vitamin A, has been identified as a potential pharmacotherapeutic for other neurological disorders due to this role. This study conducted an ATRA dose response to determine its therapeutic effects on cognitive behaviors and expression of hippocampal markers of synaptic plasticity and RA signaling proteins after experimental TBI. Under isoflurane anesthesia, adult male Sprague Dawley rats received either controlled cortical impact (CCI, 2.5 mm deformation, 4 m/s) or control surgery. Animals received daily intraperitoneal injection of 0.5, 1, 5, or 10 mg/kg of ATRA or vehicle for 2 weeks. Animals underwent motor and spatial learning and memory testing. Hippocampal expression of synaptic plasticity proteins neurogranin (Ng), and α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor GluA1 sub-unit, as well as RA signaling proteins STRA6, ADLH1a1, CYP26A1 and CYP26B1 were evaluated by western blot at 2-weeks post-injury. ATRA treatment significantly recovered Ng synaptic protein expression, while having no effect on motor performance, spatial learning, and memory, and GluA1 expression after TBI. RA signaling protein expression is unchanged 2 weeks after TBI. Overall, ATRA administration after TBI showed limited therapeutic benefits compared to the vehicle.
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Affiliation(s)
- Sarah E Svirsky
- Center for Neuroscience, University of Pittsburgh, Pittsburgh, PA, USA; Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
| | - Nicholas S Ranellone
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
| | - Madison Parry
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
| | - Erik Holets
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
| | - Jeremy Henchir
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
| | - Youming Li
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
| | - Shaun W Carlson
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
| | - C Edward Dixon
- Center for Neuroscience, University of Pittsburgh, Pittsburgh, PA, USA; Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA; V.A. Pittsburgh Healthcare System, Pittsburgh, Pennsylvania, USA.
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4
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Abdelaal MR, Haffez H. The potential roles of retinoids in combating drug resistance in cancer: implications of ATP-binding cassette (ABC) transporters. Open Biol 2022; 12:220001. [PMID: 35642494 PMCID: PMC9157304 DOI: 10.1098/rsob.220001] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Multidrug resistance (MDR) means that tumour cells become unresponsive during or after the course of treatment to one or more of chemotherapeutic drugs. Chemotherapeutic resistance critically limits the treatment outcomes and remains a key challenge for clinicians. The alternation in intracellular drug concentration through the modulation of its transport across the plasma membrane is the major cause for MDR and is adopted by various mediators, including ATP-requiring enzymes (ATPases). Among these ATPases, ABC transporters have been extensively studied, and found to be highly implicated in tumorigenesis and MDR. The present review sheds light on the documented effects of retinoids on ABC enzymes to understand their mechanism in combating cancer cell resistance. This would open the gate to test the mechanism and applicability of different new synthetic retinoids in literature and market as modulators of ATP-dependent efflux pumping activity, and promote their applicability in diminishing anti-cancer drug resistance.
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Affiliation(s)
- Mohamed R. Abdelaal
- Biochemistry and Molecular Biology Department, Faculty of Pharmacy, Helwan University, Cairo 11795, Egypt,Centre of Scientific Excellence ‘Helwan Structural Biology Research (HSBR)’, Helwan University, Cairo 11795, Egypt
| | - Hesham Haffez
- Biochemistry and Molecular Biology Department, Faculty of Pharmacy, Helwan University, Cairo 11795, Egypt,Centre of Scientific Excellence ‘Helwan Structural Biology Research (HSBR)’, Helwan University, Cairo 11795, Egypt
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5
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Hudhud L, Chisholm DR, Whiting A, Steib A, Pohóczky K, Kecskés A, Szőke É, Helyes Z. Synthetic Diphenylacetylene-Based Retinoids Induce DNA Damage in Chinese Hamster Ovary Cells without Altering Viability. Molecules 2022; 27:molecules27030977. [PMID: 35164242 PMCID: PMC8840491 DOI: 10.3390/molecules27030977] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 01/18/2022] [Accepted: 01/26/2022] [Indexed: 01/27/2023] Open
Abstract
All-trans-retinoic acid (ATRA), the active metabolite of vitamin A, plays a pivotal role in cell differentiation, proliferation and embryonic development. It is an effective therapy for dermatological disorders and malignancies. ATRA is prone to isomerization and oxidation, which can affect its activity and selectivity. Novel diphenylacetylene-based ATRA analogues with increased stability can help to overcome these problems and may offer significant potential as therapeutics for a variety of cancers and neurodegenerative diseases, including amyotrophic lateral sclerosis. Here, we investigated the effects of these retinoids on cell viability and genotoxicity in the widely used model system of the rapidly proliferating Chinese hamster ovary cell line. DC360 is a fluorescent ATRA analogue and DC324 is a non-active derivative of DC360. EC23, DC525, DC540, DC645, and DC712 are promising analogues with increased bioactivity. The cytotoxic activity of the compounds was evaluated by ATP assay and DNA damage was tested by comet assay. No cytotoxicity was observed in the 10−6–10−5 M concentration range. All compounds induced DNA migration similar to ATRA, but DC324, DC360 and EC23 did so to a greater extent, particularly at higher concentrations. We believe that retinoid receptor-independent genotoxicity is a general characteristic of these compounds; however, further studies are needed to identify the molecular mechanisms and understand their complex biological functions.
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Affiliation(s)
- Lina Hudhud
- Department of Pharmacology and Pharmacotherapy, Medical School & Szentágothai Research Centre, University of Pécs, H-7624 Pécs, Hungary; (L.H.); (A.S.); (K.P.); (A.K.); (É.S.)
| | - David R. Chisholm
- Department of Chemistry, Durham University, Durham DH1 3LE, UK; (D.R.C.); (A.W.)
| | - Andrew Whiting
- Department of Chemistry, Durham University, Durham DH1 3LE, UK; (D.R.C.); (A.W.)
| | - Anita Steib
- Department of Pharmacology and Pharmacotherapy, Medical School & Szentágothai Research Centre, University of Pécs, H-7624 Pécs, Hungary; (L.H.); (A.S.); (K.P.); (A.K.); (É.S.)
| | - Krisztina Pohóczky
- Department of Pharmacology and Pharmacotherapy, Medical School & Szentágothai Research Centre, University of Pécs, H-7624 Pécs, Hungary; (L.H.); (A.S.); (K.P.); (A.K.); (É.S.)
- Department of Pharmacology, Faculty of Pharmacy, University of Pécs, H-7624 Pécs, Hungary
| | - Angéla Kecskés
- Department of Pharmacology and Pharmacotherapy, Medical School & Szentágothai Research Centre, University of Pécs, H-7624 Pécs, Hungary; (L.H.); (A.S.); (K.P.); (A.K.); (É.S.)
| | - Éva Szőke
- Department of Pharmacology and Pharmacotherapy, Medical School & Szentágothai Research Centre, University of Pécs, H-7624 Pécs, Hungary; (L.H.); (A.S.); (K.P.); (A.K.); (É.S.)
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy, Medical School & Szentágothai Research Centre, University of Pécs, H-7624 Pécs, Hungary; (L.H.); (A.S.); (K.P.); (A.K.); (É.S.)
- Correspondence: ; Tel.: +36-72536000 (ext. 35591) or +36-204501639
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6
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Abdelaal MR, Soror SH, Elnagar MR, Haffez H. Revealing the Potential Application of EC-Synthetic Retinoid Analogues in Anticancer Therapy. Molecules 2021; 26:506. [PMID: 33477997 PMCID: PMC7835894 DOI: 10.3390/molecules26020506] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 12/31/2020] [Accepted: 01/08/2021] [Indexed: 12/12/2022] Open
Abstract
(1) Background and Aim: All-trans retinoic acid (ATRA) induces differentiation and inhibits growth of many cancer cells. However, resistance develops rapidly prompting the urgent need for new synthetic and potent derivatives. EC19 and EC23 are two synthetic retinoids with potent stem cell neuro-differentiation activity. Here, these compounds were screened for their in vitro antiproliferative and cytotoxic activity using an array of different cancer cell lines. (2) Methods: MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay, AV/PI (annexin V-fluorescein isothiocyanate (FITC)/propidium iodide (PI)), cell cycle analysis, immunocytochemistry, gene expression analysis, Western blotting, measurement of glutamate and total antioxidant concentrations were recruited. (3) Results: HepG2, Caco-2, and MCF-7 were the most sensitive cell lines; HepG2 (ATRA; 36.2, EC19; 42.2 and EC23; 0.74 µM), Caco-2 (ATRA; 58.0, EC19; 10.8 and EC23; 14.7 µM) and MCF-7 (ATRA; 99.0, EC19; 9.4 and EC23; 5.56 µM). Caco-2 cells were selected for further biochemical investigations. Isobologram analysis revealed the combined synergistic effects with 5-fluorouracil with substantial reduction in IC50. All retinoids induced apoptosis but EC19 had higher potency, with significant cell cycle arrest at subG0-G1, -S and G2/M phases, than ATRA and EC23. Moreover, EC19 reduced cellular metastasis in a transwell invasion assay due to overexpression of E-cadherin, retinoic acid-induced 2 (RAI2) and Werner (WRN) genes. (4) Conclusion: The present study suggests that EC-synthetic retinoids, particularly EC19, can be effective, alone or in combinations, for potential anticancer activity to colorectal cancer. Further in vivo studies are recommended to pave the way for clinical applications.
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Affiliation(s)
- Mohamed R. Abdelaal
- Biochemistry and Molecular Biology Department, Faculty of Pharmacy, Helwan University, Cairo 11795, Egypt; (M.R.A.); (S.H.S.)
- Center of Scientific Excellence “Helwan Structural Biology Research, (HSBR)”, Helwan University, Cairo 11795, Egypt
| | - Sameh H. Soror
- Biochemistry and Molecular Biology Department, Faculty of Pharmacy, Helwan University, Cairo 11795, Egypt; (M.R.A.); (S.H.S.)
- Center of Scientific Excellence “Helwan Structural Biology Research, (HSBR)”, Helwan University, Cairo 11795, Egypt
| | - Mohamed R. Elnagar
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Al-Azhar University, Cairo 11823, Egypt;
| | - Hesham Haffez
- Biochemistry and Molecular Biology Department, Faculty of Pharmacy, Helwan University, Cairo 11795, Egypt; (M.R.A.); (S.H.S.)
- Center of Scientific Excellence “Helwan Structural Biology Research, (HSBR)”, Helwan University, Cairo 11795, Egypt
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7
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Tissue localization of retinoic acid receptor (RAR) active drugs. Methods Enzymol 2020. [PMID: 32359657 DOI: 10.1016/bs.mie.2020.03.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
The retinoic acid (RA) signaling pathway is crucial for the control of embryonic development and also regulates function of several organ systems in the adult, including the central nervous system. The retinoic acid receptors (RARs) that mediate the majority of the functions of RA can promote proliferation, differentiation, morphogenesis and cell survival. Dysregulation of this signaling pathway has been considered in the pathophysiology of various diseases including neurodegenerative disorders such Alzheimer's disease and amyotrophic lateral sclerosis. Thus, drugs targeted to the RARs have been proposed as treatments for such diseases. Understanding how these drugs distribute in the body is essential to determine their potential effectiveness. However measuring tissue levels of what are often lipophilic drugs can be difficult. Here we describe an indirect measurement of RAR ligand tissue distribution after intraperitoneal injection into rodents that uses a sensitive RA reporter cell line.
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A Systematic Analysis Revealed the Potential Gene Regulatory Processes of ATRA-Triggered Neuroblastoma Differentiation and Identified a Novel RA Response Sequence in the NTRK2 Gene. BIOMED RESEARCH INTERNATIONAL 2020; 2020:6734048. [PMID: 32149119 PMCID: PMC7053487 DOI: 10.1155/2020/6734048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 01/03/2020] [Accepted: 01/16/2020] [Indexed: 12/14/2022]
Abstract
Retinoic acid- (RA-) triggered neuroblastoma cell lines are widely used cell modules of neuronal differentiation in neurodegenerative disease studies, but the gene regulatory mechanism underlying differentiation is unclear now. In this study, system biological analysis was performed on public microarray data from three neuroblastoma cell lines (SK-N-SH, SH-SY5Y-A, and SH-SY5Y-E) to explore the potential molecular processes of all-trans retinoic acid- (ATRA-) triggered differentiation. RT-qPCR, functional genomics analysis, western blotting, chromatin immunoprecipitation (ChIP), and homologous sequence analysis were further performed to validate the gene regulation processes and identify the RA response element in a specific gene. The potential disturbed biological pathways (111 functional GO terms in 14 interactive functional groups) and gene regulatory network (10 regulators and 71 regulated genes) in neuroblastoma differentiation were obtained. 15 of the 71 regulated genes are neuronal projection-related. Among them, NTRK2 is the only one that was dramatically upregulated in the RT-qPCR test that we performed on ATRA-treated SH-SY5Y-A cells. We further found that the overexpression of the NTRK2 gene can trigger differentiation-like changes in SH-SY5Y-A cells. Functional genomic analysis and western blotting assay suggested that, in neuroblastoma cells, ATRA may directly regulate the NTRK2 gene by activating the RA receptor (RAR) that binds in its promoter region. A novel RA response DNA element in the NTRK2 gene was then identified by bioinformatics analysis and chromatin immunoprecipitation (ChIP) assay. The novel element is sequence conservation and position variation among different species. Our study systematically provided the potential regulatory information of ATRA-triggered neuroblastoma differentiation, and in the NTRK2 gene, we identified a novel RA response DNA element, which may contribute to the differentiation in a human-specific manner.
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Chisholm DR, Lamb R, Pallett T, Affleck V, Holden C, Marrison J, O'Toole P, Ashton PD, Newling K, Steffen A, Nelson AK, Mahler C, Valentine R, Blacker TS, Bain AJ, Girkin J, Marder TB, Whiting A, Ambler CA. Photoactivated cell-killing involving a low molecular weight, donor-acceptor diphenylacetylene. Chem Sci 2019; 10:4673-4683. [PMID: 31123578 PMCID: PMC6495688 DOI: 10.1039/c9sc00199a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Accepted: 03/20/2019] [Indexed: 01/02/2023] Open
Abstract
Drug-like, donor–acceptor diphenylacetylenes cause efficient cell death upon photoactivation and hence have potential phototherapeutic applications.
Photoactivation of photosensitisers can be utilised to elicit the production of ROS, for potential therapeutic applications, including the destruction of diseased tissues and tumours. A novel class of photosensitiser, exemplified by DC324, has been designed possessing a modular, low molecular weight and ‘drug-like’ structure which is bioavailable and can be photoactivated by UV-A/405 nm or corresponding two-photon absorption of near-IR (800 nm) light, resulting in powerful cytotoxic activity, ostensibly through the production of ROS in a cellular environment. A variety of in vitro cellular assays confirmed ROS formation and in vivo cytotoxic activity was exemplified via irradiation and subsequent targeted destruction of specific areas of a zebrafish embryo.
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Affiliation(s)
- David R Chisholm
- Department of Chemistry , Durham University , Science Laboratories , South Road , Durham DH1 3LE , UK .
| | - Rebecca Lamb
- Department of Biosciences , Durham University , South Road , Durham, DH1 3LE , UK
| | - Tommy Pallett
- Department of Biosciences , Durham University , South Road , Durham, DH1 3LE , UK.,Biophysical Sciences Institute , Department of Physics , Durham University , South Road , Durham , DH1 3LE , UK
| | - Valerie Affleck
- LightOx Limited , Wynyard Park House , Wynyard Avenue, Wynyard , Billingham , TS22 5TB , UK
| | - Claire Holden
- Department of Chemistry , Durham University , Science Laboratories , South Road , Durham DH1 3LE , UK . .,Department of Biosciences , Durham University , South Road , Durham, DH1 3LE , UK
| | - Joanne Marrison
- Bioscience Technology Facility , Department of Biology , University of York , York , YO10 5DD , UK
| | - Peter O'Toole
- Bioscience Technology Facility , Department of Biology , University of York , York , YO10 5DD , UK
| | - Peter D Ashton
- Bioscience Technology Facility , Department of Biology , University of York , York , YO10 5DD , UK
| | - Katherine Newling
- Bioscience Technology Facility , Department of Biology , University of York , York , YO10 5DD , UK
| | - Andreas Steffen
- Institut für Anorganische Chemie , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany
| | - Amanda K Nelson
- Institut für Anorganische Chemie , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany
| | - Christoph Mahler
- Institut für Anorganische Chemie , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany
| | - Roy Valentine
- High Force Research Ltd. , Bowburn North Industrial Estate , Bowburn , Durham , DH6 5PF , UK
| | - Thomas S Blacker
- Department of Physics & Astronomy , University College London , Gower Street , London , WC1E 6BT , UK
| | - Angus J Bain
- Department of Physics & Astronomy , University College London , Gower Street , London , WC1E 6BT , UK
| | - John Girkin
- Biophysical Sciences Institute , Department of Physics , Durham University , South Road , Durham , DH1 3LE , UK
| | - Todd B Marder
- Institut für Anorganische Chemie , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany
| | - Andrew Whiting
- Department of Chemistry , Durham University , Science Laboratories , South Road , Durham DH1 3LE , UK .
| | - Carrie A Ambler
- Department of Biosciences , Durham University , South Road , Durham, DH1 3LE , UK
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10
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Chisholm DR, Tomlinson CWE, Zhou GL, Holden C, Affleck V, Lamb R, Newling K, Ashton P, Valentine R, Redfern C, Erostyák J, Makkai G, Ambler CA, Whiting A, Pohl E. Fluorescent Retinoic Acid Analogues as Probes for Biochemical and Intracellular Characterization of Retinoid Signaling Pathways. ACS Chem Biol 2019; 14:369-377. [PMID: 30707838 DOI: 10.1021/acschembio.8b00916] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Retinoids, such as all- trans-retinoic acid (ATRA), are endogenous signaling molecules derived from vitamin A that influence a variety of cellular processes through mediation of transcription events in the cell nucleus. Because of these wide-ranging and powerful biological activities, retinoids have emerged as therapeutic candidates of enormous potential. However, their use has been limited, to date, due to a lack of understanding of the complex and intricate signaling pathways that they control. We have designed and synthesized a family of synthetic retinoids that exhibit strong, intrinsic, solvatochromatic fluorescence as multifunctional tools to interrogate these important biological activities. We utilized the unique photophysical characteristics of these fluorescent retinoids to develop a novel in vitro fluorometric binding assay to characterize and quantify their binding to their cellular targets, including cellular retinoid binding protein II (CRABPII). The dihydroquinoline retinoid, DC360, exhibited particularly strong binding ( Kd = 34.0 ± 2.5 nM), and we further used X-ray crystallography to determine the structure of the DC360-CRABPII complex to 1.8 Å, which showed that DC360 occupies the known hydrophobic retinoid binding pocket. Finally, we used confocal fluorescence microscopy to image the cellular behavior of the compounds in cultured human epithelial cells, highlighting a fascinating nuclear localization, and used RNA sequencing to confirm that the compounds regulate cellular processes similar to those of ATRA. We anticipate that the unique properties of these fluorescent retinoids can now be used to cast new light on the vital and highly complex retinoid signaling pathway.
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Affiliation(s)
- David R. Chisholm
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
| | - Charles W. E. Tomlinson
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
- Department of Biosciences, Durham University, South Road, Durham DH1 3LE, U.K
| | - Garr-Layy Zhou
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
| | - Claire Holden
- Department of Biosciences, Durham University, South Road, Durham DH1 3LE, U.K
| | - Valerie Affleck
- LightOx Limited, Wynyard Park House, Wynyard Avenue, Wynyard, Billingham TS22 5TB, U.K
| | - Rebecca Lamb
- Department of Biosciences, Durham University, South Road, Durham DH1 3LE, U.K
| | - Katherine Newling
- Genomics and Bioinformatics Laboratory, Department of Biology, University of York, York YO10 5DD, U.K
| | - Peter Ashton
- Genomics and Bioinformatics Laboratory, Department of Biology, University of York, York YO10 5DD, U.K
| | - Roy Valentine
- High Force Research Limited, Bowburn North Industrial Estate, Bowburn, Durham DH6 5PF, U.K
| | - Christopher Redfern
- Northern Institute for Cancer Research, Medical School, Newcastle University, Newcastle upon Tyne NE2 4HH, U.K
| | - János Erostyák
- University of Pecs, Szentagothai Research Centre, Spectroscopy Research Group, Ifjusag u. 20, H-7624 Pecs, Hungary
- University of Pecs, Faculty of Sciences, Ifjusag u. 6, H-7624 Pecs, Hungary
| | - Geza Makkai
- University of Pecs, Szentagothai Research Centre, Spectroscopy Research Group, Ifjusag u. 20, H-7624 Pecs, Hungary
- University of Pecs, Faculty of Sciences, Ifjusag u. 6, H-7624 Pecs, Hungary
| | - Carrie A. Ambler
- Department of Biosciences, Durham University, South Road, Durham DH1 3LE, U.K
| | - Andrew Whiting
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
| | - Ehmke Pohl
- Department of Biosciences, Durham University, South Road, Durham DH1 3LE, U.K
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