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Shakeel F, Haq N, Alshehri S, Alenazi M, Alwhaibi A, Alsarra IA. Solubility and Thermodynamic Analysis of Isotretinoin in Different (DMSO + Water) Mixtures. Molecules 2023; 28:7110. [PMID: 37894589 PMCID: PMC10609013 DOI: 10.3390/molecules28207110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 10/09/2023] [Accepted: 10/13/2023] [Indexed: 10/29/2023] Open
Abstract
The solubility and solution thermodynamics of isotretinoin (ITN) (3) in numerous {dimethyl sulfoxide (DMSO) (1) + water (H2O) (2)} combinations were studied at 298.2-318.2 K under fixed atmospheric pressure of 101.1 kPa. A shake flask methodology was used to determine ITN solubility, and correlations were made using the "van't Hoff, Apelblat, Buchowski-Ksiazczak λh, Yalkowsky-Roseman, Jouyban-Acree, and Jouyban-Acree-van't Hoff models". In mixtures of {(DMSO (1) + H2O (2)}, the solubility of ITN in mole fractions was enhanced with the temperature and DMSO mass fraction. The mole fraction solubility of ITN was highest in neat DMSO (1.02 × 10-1 at 318.2 K) and lowest in pure H2O (3.14 × 10-7 at 298.2 K). The output of computational models revealed good relationships between the solubility data from the experiments. The dissolution of ITN was "endothermic and entropy-driven" in all of the {(DMSO (1) + H2O (2)} mixtures examined, according to the positive values of measured thermodynamic parameters. Enthalpy was discovered to be the driving force behind ITN solvation in {(DMSO (1) + H2O (2)} combinations. ITN-DMSO displayed the highest molecular interactions when compared to ITN-H2O. The outcomes of this study suggest that DMSO has a great potential for solubilizing ITN in H2O.
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Affiliation(s)
- Faiyaz Shakeel
- Department of Pharmaceutics, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia; (N.H.); (S.A.); (I.A.A.)
| | - Nazrul Haq
- Department of Pharmaceutics, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia; (N.H.); (S.A.); (I.A.A.)
| | - Sultan Alshehri
- Department of Pharmaceutics, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia; (N.H.); (S.A.); (I.A.A.)
| | - Miteb Alenazi
- Department of Clinical Pharmacy, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia; (M.A.); (A.A.)
| | - Abdulrahman Alwhaibi
- Department of Clinical Pharmacy, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia; (M.A.); (A.A.)
| | - Ibrahim A. Alsarra
- Department of Pharmaceutics, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia; (N.H.); (S.A.); (I.A.A.)
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An Isochroman Analog of CD3254 and Allyl-, Isochroman-Analogs of NEt-TMN Prove to Be More Potent Retinoid-X-Receptor (RXR) Selective Agonists Than Bexarotene. Int J Mol Sci 2022; 23:ijms232416213. [PMID: 36555852 PMCID: PMC9782500 DOI: 10.3390/ijms232416213] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 12/09/2022] [Accepted: 12/14/2022] [Indexed: 12/23/2022] Open
Abstract
Bexarotene is an FDA-approved drug for the treatment of cutaneous T-cell lymphoma (CTCL); however, its use provokes or disrupts other retinoid-X-receptor (RXR)-dependent nuclear receptor pathways and thereby incites side effects including hypothyroidism and raised triglycerides. Two novel bexarotene analogs, as well as three unique CD3254 analogs and thirteen novel NEt-TMN analogs, were synthesized and characterized for their ability to induce RXR agonism in comparison to bexarotene (1). Several analogs in all three groups possessed an isochroman ring substitution for the bexarotene aliphatic group. Analogs were modeled for RXR binding affinity, and EC50 as well as IC50 values were established for all analogs in a KMT2A-MLLT3 leukemia cell line. All analogs were assessed for liver-X-receptor (LXR) activity in an LXRE system to gauge the potential for the compounds to provoke raised triglycerides by increasing LXR activity, as well as to drive LXRE-mediated transcription of brain ApoE expression as a marker for potential therapeutic use in neurodegenerative disorders. Preliminary results suggest these compounds display a broad spectrum of off-target activities. However, many of the novel compounds were observed to be more potent than 1. While some RXR agonists cross-signal the retinoic acid receptor (RAR), many of the rexinoids in this work displayed reduced RAR activity. The isochroman group did not appear to substantially reduce RXR activity on its own. The results of this study reveal that modifying potent, selective rexinoids like bexarotene, CD3254, and NEt-TMN can provide rexinoids with increased RXR selectivity, decreased potential for cross-signaling, and improved anti-proliferative characteristics in leukemia models compared to 1.
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Shakeel F, Haq N, Mahdi WA, Alsarra IA, Alshehri S, Alenazi M, Alwhaibi A. Solubilization and Thermodynamic Analysis of Isotretinoin in Eleven Different Green Solvents at Different Temperatures. MATERIALS (BASEL, SWITZERLAND) 2022; 15:8274. [PMID: 36431759 PMCID: PMC9692401 DOI: 10.3390/ma15228274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 11/17/2022] [Accepted: 11/18/2022] [Indexed: 06/16/2023]
Abstract
The solubilization and thermodynamic analysis of isotretinoin (ITN) in eleven distinct green solvents, such as water, methyl alcohol (MeOH), ethyl alcohol (EtOH), 1-butyl alcohol (1-BuOH), 2-butyl alcohol (2-BuOH), ethane-1,2-diol (EG), propane-1,2-diol (PG), polyethylene glycol-400 (PEG-400), ethyl acetate (EA), Transcutol-HP (THP), and dimethyl sulfoxide (DMSO) was studied at several temperatures and a fixed atmospheric pressure. The equilibrium approach was used to measure the solubility of ITN, and the Apelblat, van’t Hoff, and Buchowski−Ksiazczak λh models were used to correlate the results. The overall uncertainties were less than 5.0% for all the models examined. The highest ITN mole fraction solubility was achieved as 1.01 × 10−1 in DMSO at 318.2 K; however, the least was achieved as 3.16 × 10−7 in water at 298.2 K. ITN solubility was found to be enhanced with an increase in temperature and the order in which it was soluble in several green solvents at 318.2 K was as follows: DMSO (1.01 × 10−1) > EA (1.73 × 10−2) > PEG-400 (1.66 × 10−2) > THP (1.59 × 10−2) > 2-BuOH (6.32 × 10−3) > 1-BuOH (5.88 × 10−3) > PG (4.83 × 10−3) > EtOH (3.51 × 10−3) > EG (3.49 × 10−3) > MeOH (2.10 × 10−3) > water (1.38 × 10−6). ITN−DMSO showed the strongest solute−solvent interactions when compared to the other ITN and green solvent combinations. According to thermodynamic studies, ITN dissolution was endothermic and entropy-driven in all of the green solvents tested. The obtained outcomes suggested that DMSO appears to be the best green solvent for ITN solubilization.
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Affiliation(s)
- Faiyaz Shakeel
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Nazrul Haq
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Wael A. Mahdi
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Ibrahim A. Alsarra
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Sultan Alshehri
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Miteb Alenazi
- Department of Clinical Pharmacy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Abdulrahman Alwhaibi
- Department of Clinical Pharmacy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
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Jurutka PW, di Martino O, Reshi S, Mallick S, Sabir ZL, Staniszewski LJP, Warda A, Maiorella EL, Minasian A, Davidson J, Ibrahim SJ, Raban S, Haddad D, Khamisi M, Suban SL, Dawson BJ, Candia R, Ziller JW, Lee MY, Liu C, Liu W, Marshall PA, Welch JS, Wagner CE. Modeling, Synthesis, and Biological Evaluation of Potential Retinoid-X-Receptor (RXR) Selective Agonists: Analogs of 4-[1-(3,5,5,8,8-Pentamethyl-5,6,7,8-tetrahyro-2-naphthyl)ethynyl]benzoic Acid (Bexarotene) and 6-(Ethyl(4-isobutoxy-3-isopropylphenyl)amino)nicotinic Acid (NEt-4IB). Int J Mol Sci 2021; 22:ijms222212371. [PMID: 34830251 PMCID: PMC8624485 DOI: 10.3390/ijms222212371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 11/08/2021] [Accepted: 11/12/2021] [Indexed: 12/05/2022] Open
Abstract
Five novel analogs of 6-(ethyl)(4-isobutoxy-3-isopropylphenyl)amino)nicotinic acid—or NEt-4IB—in addition to seven novel analogs of 4-[1-(3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydro-2-naphthyl)ethynyl]benzoic acid (bexarotene) were prepared and evaluated for selective retinoid-X-receptor (RXR) agonism alongside bexarotene (1), a FDA-approved drug for cutaneous T-cell lymphoma (CTCL). Bexarotene treatment elicits side-effects by provoking or disrupting other RXR-dependent pathways. Analogs were assessed by the modeling of binding to RXR and then evaluated in a human cell-based RXR-RXR mammalian-2-hybrid (M2H) system as well as a RXRE-controlled transcriptional system. The analogs were also tested in KMT2A-MLLT3 leukemia cells and the EC50 and IC50 values were determined for these compounds. Moreover, the analogs were assessed for activation of LXR in an LXRE system as drivers of ApoE expression and subsequent use as potential therapeutics in neurodegenerative disorders, and the results revealed that these compounds exerted a range of differential LXR-RXR activation and selectivity. Furthermore, several of the novel analogs in this study exhibited reduced RARE cross-signaling, implying RXR selectivity. These results demonstrate that modification of partial agonists such as NEt-4IB and potent rexinoids such as bexarotene can lead to compounds with improved RXR selectivity, decreased cross-signaling of other RXR-dependent nuclear receptors, increased LXRE-heterodimer selectivity, and enhanced anti-proliferative potential in leukemia cell lines compared to therapeutics such as 1.
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Affiliation(s)
- Peter W. Jurutka
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
- Basic Medical Sciences, University of Arizona College of Medicine, Phoenix, AZ 85004, USA
| | - Orsola di Martino
- Department of Internal Medicine, Washington University, St. Louis, MO 63110, USA; (O.d.M.); (J.S.W.)
| | - Sabeeha Reshi
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
| | - Sanchita Mallick
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
| | - Zhela L. Sabir
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
| | - Lech J. P. Staniszewski
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
| | - Ankedo Warda
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
- Basic Medical Sciences, University of Arizona College of Medicine, Phoenix, AZ 85004, USA
| | - Emma L. Maiorella
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
| | - Ani Minasian
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
| | - Jesse Davidson
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
| | - Samir J. Ibrahim
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
| | - San Raban
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
| | - Dena Haddad
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
| | - Madleen Khamisi
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
| | - Stephanie L. Suban
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
| | - Bradley J. Dawson
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
| | - Riley Candia
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
| | - Joseph W. Ziller
- Department of Chemistry, University of California, Irvine, CA 92697, USA;
| | - Ming-Yue Lee
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85201, USA; (M.-Y.L.); (C.L.); (W.L.)
| | - Chang Liu
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85201, USA; (M.-Y.L.); (C.L.); (W.L.)
| | - Wei Liu
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85201, USA; (M.-Y.L.); (C.L.); (W.L.)
| | - Pamela A. Marshall
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
| | - John S. Welch
- Department of Internal Medicine, Washington University, St. Louis, MO 63110, USA; (O.d.M.); (J.S.W.)
| | - Carl E. Wagner
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA; (P.W.J.); (S.R.); (S.M.); (Z.L.S.); (L.J.P.S.); (A.W.); (E.L.M.); (A.M.); (J.D.); (S.J.I.); (S.R.); (D.H.); (M.K.); (S.L.S.); (B.J.D.); (R.C.); (P.A.M.)
- Correspondence: ; Tel.: +1-602-543-6937
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Yang Z, Muccio DD, Melo N, Atigadda VR, Renfrow MB. Stability of the Retinoid X Receptor-α Homodimer in the Presence and Absence of Rexinoid and Coactivator Peptide. Biochemistry 2021; 60:1165-1177. [PMID: 33792309 PMCID: PMC9949482 DOI: 10.1021/acs.biochem.0c00865] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Differential scanning calorimetry and differential scanning fluorimetry were used to measure the thermal stability of human retinoid X receptor-α ligand binding domain (RXRα LBD) homodimer in the absence or presence of rexinoid and coactivator peptide, GRIP-1. The apo-RXRα LBD homodimer displayed a single thermal unfolding transition with a Tm of 58.7 °C and an unfolding enthalpy (ΔH) of 673 kJ/mol (12.5 J/g), much lower than average value (35 J/g) of small globular proteins. Using a heat capacity change (ΔCp) of 15 kJ/(mol K) determined by measurements at different pH values, the free energy of unfolding (ΔG) of the native state was 33 kJ/mol at 37 °C. Rexinoid binding to the apo-homodimer increased Tm by 5 to 9 °C and increased the ΔG of the native homodimer by 12 to 20 kJ/mol at 37 °C, consistent with the nanomolar dissociation constant (Kd) of the rexinoids. GRIP-1 binding to holo-homodimers containing rexinoid resulted in additional increases in ΔG of 14 kJ/mol, a value that was the same for all three rexinoids. Binding of rexinoid and GRIP-1 resulted in a combined 50% increase in unfolding enthalpy, consistent with reduced structural fluidity and more compact folding observed in other published structural studies. The complexes of UAB110 and UAB111 are each more stable than the UAB30 complex by 8 kJ/mol due to enhanced hydrophobic interactions in the binding pocket because of their larger end groups. This increase in thermodynamic stability positively correlates with their improved RXR activation potency. Thermodynamic measurements are thus valuable in predicting agonist potency.
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Affiliation(s)
- Zhengrong Yang
- Department of Biochemistry & Molecular Genetics, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama 35294, United States
| | - Donald D Muccio
- Department of Biochemistry & Molecular Genetics, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama 35294, United States
| | - Nathalia Melo
- Department of Biochemistry & Molecular Genetics, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama 35294, United States
| | - Venkatram R Atigadda
- Department of Dermatology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama 35294, United States
| | - Matthew B Renfrow
- Department of Biochemistry & Molecular Genetics, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama 35294, United States
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Ren G, Kim T, Kim HS, Young ME, Muccio DD, Atigadda VR, Blum SI, Tse HM, Habegger KM, Bhatnagar S, Coric T, Bjornsti MA, Shalev A, Frank SJ, Kim JA. A Small Molecule, UAB126, Reverses Diet-Induced Obesity and its Associated Metabolic Disorders. Diabetes 2020; 69:2003-2016. [PMID: 32611548 PMCID: PMC7458036 DOI: 10.2337/db19-1001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 06/18/2020] [Indexed: 12/13/2022]
Abstract
Targeting retinoid X receptor (RXR) has been proposed as one of the therapeutic strategies to treat individuals with metabolic syndrome, as RXR heterodimerizes with multiple nuclear receptors that regulate genes involved in metabolism. Despite numerous efforts, RXR ligands (rexinoids) have not been approved for clinical trials to treat metabolic syndrome due to the serious side effects such as hypertriglyceridemia and altered thyroid hormone axis. In this study, we demonstrate a novel rexinoid-like small molecule, UAB126, which has positive effects on metabolic syndrome without the known side effects of potent rexinoids. Oral administration of UAB126 ameliorated obesity, insulin resistance, hepatic steatosis, and hyperlipidemia without changes in food intake, physical activity, and thyroid hormone levels. RNA-sequencing analysis revealed that UAB126 regulates the expression of genes in the liver that are modulated by several nuclear receptors, including peroxisome proliferator-activated receptor α and/or liver X receptor in conjunction with RXR. Furthermore, UAB126 not only prevented but also reversed obesity-associated metabolic disorders. The results suggest that optimized modulation of RXR may be a promising strategy to treat metabolic disorders without side effects. Thus, the current study reveals that UAB126 could be an attractive therapy to treat individuals with obesity and its comorbidities.
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Affiliation(s)
- Guang Ren
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL
- UAB Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL
| | - Teayoun Kim
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL
- UAB Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL
| | - Hae-Suk Kim
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL
- UAB Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL
| | - Martin E Young
- UAB Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL
| | - Donald D Muccio
- Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, AL
| | - Venkatram R Atigadda
- Department of Chemistry, University of Alabama at Birmingham, Birmingham, AL
- Department of Dermatology, University of Alabama at Birmingham, Birmingham, AL
| | - Samuel I Blum
- UAB Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, AL
| | - Hubert M Tse
- UAB Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, AL
| | - Kirk M Habegger
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL
- UAB Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL
| | - Sushant Bhatnagar
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL
- UAB Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL
| | - Tatjana Coric
- Department of Pharmacology and Toxicology, University of Alabama at Birmingham, Birmingham, AL
| | - Mary-Ann Bjornsti
- Department of Pharmacology and Toxicology, University of Alabama at Birmingham, Birmingham, AL
| | - Anath Shalev
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL
- UAB Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL
| | - Stuart J Frank
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL
- UAB Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL
| | - Jeong-A Kim
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL
- UAB Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL
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7
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Ondrey FG. Pioglitazone, Nuclear Receptors, and Aerodigestive Prevention. Cancer Prev Res (Phila) 2019; 12:641-644. [PMID: 31537582 DOI: 10.1158/1940-6207.capr-19-0341] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 08/02/2019] [Accepted: 08/02/2019] [Indexed: 11/16/2022]
Abstract
There has been intense interest in nuclear receptor targeting for cancer prevention. With the exception of estrogen antagonism in breast carcinoma there has not been widespread adoption or success of this strategy in clinical cancer prevention. Keith and colleagues have performed a careful study, which utilized the PPARγ nuclear receptor agonist, pioglitazone, a common type II diabetes agent, in subjects at risk for lung carcinoma. Although the results are not promising with this strategy, the study provides evidence for feasibility accrual and biomarker strategies that could be utilized to gain additional insight in future trials.
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Affiliation(s)
- Frank G Ondrey
- Department of Otolaryngology, University of Minnesota, Minneapolis, Minnesota.
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8
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Williams AP, Garner EF, Stafman LL, Aye JM, Quinn CH, Marayati R, Stewart JE, Atigadda VR, Mroczek-Musulman E, Moore BP, Beierle EA, Friedman GK. UAB30, A Novel Rexinoid Agonist, Decreases Stemness In Group 3 Medulloblastoma Human Cell Line Xenografts. Transl Oncol 2019; 12:1364-1374. [PMID: 31362265 PMCID: PMC6664160 DOI: 10.1016/j.tranon.2019.07.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 06/29/2019] [Accepted: 07/08/2019] [Indexed: 12/29/2022] Open
Abstract
PURPOSE: In spite of advances in therapy for some subtypes, group 3 medulloblastoma continues to portend a poor prognosis. A subpopulation of medulloblastoma cells expressing the cell surface marker CD133 have been posited as possible stem cell like cancer cells (SCLCC), a potential source of drug resistance and relapse. Retinoids have been shown to affect SCLCC in other brain tumors. Based on these findings, we hypothesized that the CD133-enriched cell population group 3 medulloblastoma cells would be sensitive to the novel rexinoid, UAB30. METHODS: Human medulloblastoma cell lines were studied. Cell sorting based on CD133 expression was performed. Both in vitro and in vivo extreme limiting dilution assays were completed to establish CD133 as a SCLCC marker in these cell lines. Cells were treated with either retinoic acid (RA) or UAB30 and sphere forming capacity and CD133 expression were assessed. Immunoblotting was used to assess changes in stem cell markers. Finally, mice injected with CD133-enriched or CD133-depleted cells were treated with UAB30. RESULTS: CD133-enriched cells more readily formed tumorspheres in vitro at lower cell concentrations and formed tumors in vivo at low cell numbers. Treatment with RA or UAB30 decreased CD133 expression, decreased tumorsphere formation, and decreased expression of cancer stem cell markers. In vivo studies demonstrated that tumors from both CD133-enriched and CD133-depleted cells were sensitive to treatment with UAB30. CONCLUSIONS: CD133 is a marker for medulloblastoma SCLCCs. Both CD133-enriched and CD133-depleted medulloblastoma cell populations demonstrated sensitivity to UAB30, indicating its potential as a therapeutic option for group 3 medulloblastoma.
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Affiliation(s)
- Adele P Williams
- Division of Pediatric Surgery, Department of Surgery, University of Alabama, Birmingham, Birmingham, AL
| | - Evan F Garner
- Division of Pediatric Surgery, Department of Surgery, University of Alabama, Birmingham, Birmingham, AL
| | - Laura L Stafman
- Division of Pediatric Surgery, Department of Surgery, University of Alabama, Birmingham, Birmingham, AL
| | - Jamie M Aye
- Division of Pediatric Hematology Oncology, Department of Pediatrics, University of Alabama, Birmingham, Birmingham, AL
| | - Colin H Quinn
- Division of Pediatric Surgery, Department of Surgery, University of Alabama, Birmingham, Birmingham, AL
| | - Raoud Marayati
- Division of Pediatric Surgery, Department of Surgery, University of Alabama, Birmingham, Birmingham, AL
| | - Jerry E Stewart
- Division of Pediatric Surgery, Department of Surgery, University of Alabama, Birmingham, Birmingham, AL
| | | | | | - Blake P Moore
- Division of Pediatric Hematology Oncology, Department of Pediatrics, University of Alabama, Birmingham, Birmingham, AL
| | - Elizabeth A Beierle
- Division of Pediatric Surgery, Department of Surgery, University of Alabama, Birmingham, Birmingham, AL.
| | - Gregory K Friedman
- Division of Pediatric Hematology Oncology, Department of Pediatrics, University of Alabama, Birmingham, Birmingham, AL
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9
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Krężel W, Rühl R, de Lera AR. Alternative retinoid X receptor (RXR) ligands. Mol Cell Endocrinol 2019; 491:110436. [PMID: 31026478 DOI: 10.1016/j.mce.2019.04.016] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 04/06/2019] [Accepted: 04/22/2019] [Indexed: 12/15/2022]
Abstract
Retinoid X receptors (RXRs) control a wide variety of functions by virtue of their dimerization with other nuclear hormone receptors (NRs), contributing thereby to activities of different signaling pathways. We review known RXR ligands as transcriptional modulators of specific RXR-dimers and the associated biological processes. We also discuss the physiological relevance of such ligands, which remains frequently a matter of debate and which at present is best met by member(s) of a novel family of retinoids, postulated as Vitamin A5. Through comparison with other natural, but also with synthetic ligands, we discuss high diversity in the modes of ligand binding to RXRs resulting in agonistic or antagonistic profiles and selectivity towards specific subtypes of permissive heterodimers. Despite such diversity, direct ligand binding to the ligand binding pocket resulting in agonistic activity was preferentially preserved in the course of animal evolution pointing to its functional relevance, and potential for existence of other, species-specific endogenous RXR ligands sharing the same mode of function.
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Affiliation(s)
- Wojciech Krężel
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France; Centre National de la Recherche Scientifique, UMR 7104, Illkirch, France; Institut National de la Santé et de la Recherche Médicale, U 1258, Illkirch, France; Université de Strasbourg, Illkirch, France.
| | - Ralph Rühl
- Paprika Bioanalytics BT, Debrecen, Hungary
| | - Angel R de Lera
- Departamento de Química Orgánica, Facultade de Química, Lagoas-Marcosende, 36310, Vigo, Spain
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10
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de Almeida NR, Conda-Sheridan M. A review of the molecular design and biological activities of RXR agonists. Med Res Rev 2019; 39:1372-1397. [PMID: 30941786 DOI: 10.1002/med.21578] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 03/09/2019] [Accepted: 03/16/2019] [Indexed: 12/13/2022]
Abstract
An attractive approach to combat disease is to target theregulation of cell function. At the heart of this task are nuclear receptors (NRs); which control functions such as gene transcription. Arguably, the key player in this regulatory machinery is the retinoid X receptor (RXR). This NR associates with a third of the NRs found in humans. Scientists have hypothesized that controlling the activity of RXR is an attractive approach to control cellular functions that modulate diseases such as cancer, diabetes, Alzheimer's disease and Parkinson's disease. In this review, we will describe the key features of the RXR, present a historic perspective of the first RXR agonists, and discuss various templates that have been reported to activate RXR with a focus on their molecular structure, biological activity, and limitations. Finally, we will present an outlook of the field and future directions and considerations to synthesize or modulate RXR agonists to make these compounds a clinical reality.
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Affiliation(s)
| | - Martin Conda-Sheridan
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, Nebraska
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11
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Abstract
Retinoid X receptors (RXRs) are promiscuous partners of heterodimeric associations with other members of the Nuclear Receptor (NR) superfamily. RXR ligands ("rexinoids") either transcriptionally activate the "permissive" subclass of heterodimers or synergize with partner ligands in the "nonpermissive" subclass of heterodimers. The rationale for rexinoid design with a wide structural diversity going from the structures of existing complexes with RXR determined by X-Ray, to natural products and other ligands discovered by high-throughput screening (HTS), mere serendipity, and rationally designed based on Molecular Modeling, will be described. Included is the new generation of ligands that modulate the structure of specific receptor surfaces that serve to communicate with other regulators. The panel of the known RXR agonists, partial (ant)agonists, and/or heterodimer-selective rexinoids require the exploration of their therapeutic potential in order to overcome some of the current limitations of rexinoids in therapy.
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Affiliation(s)
- Claudio Martínez
- Departamento de Química Orgánica, Facultade de Química, CINBIO and IBIV, Universidade de Vigo, Vigo, Spain
| | - José A Souto
- Departamento de Química Orgánica, Facultade de Química, CINBIO and IBIV, Universidade de Vigo, Vigo, Spain
| | - Angel R de Lera
- Departamento de Química Orgánica, Facultade de Química, CINBIO and IBIV, Universidade de Vigo, Vigo, Spain.
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12
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Garner EF, Stafman LL, Williams AP, Aye JM, Goolsby C, Atigadda VR, Moore BP, Nan L, Stewart JE, Hjelmeland AB, Friedman GK, Beierle EA. UAB30, a novel RXR agonist, decreases tumorigenesis and leptomeningeal disease in group 3 medulloblastoma patient-derived xenografts. J Neurooncol 2018; 140:209-224. [PMID: 30132166 PMCID: PMC6239946 DOI: 10.1007/s11060-018-2950-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 07/12/2018] [Indexed: 02/06/2023]
Abstract
BACKGROUND Group 3 tumors account for approximately 25-30% of medulloblastomas and have the worst prognosis. UAB30 is a novel synthetic rexinoid shown to have limited toxicities in humans and significant efficacy in the pediatric neuroectodermal tumor, neuroblastoma. We hypothesized that treatment with UAB30 would decrease tumorigenicity in medulloblastoma patient-derived xenografts (PDXs). METHODS Three group 3 medulloblastoma PDXs (D341, D384 and D425) were utilized. Cell viability, proliferation, migration and invasion assays were performed after treatment with UAB30 or 13-cis-retinoic acid (RA). Cell cycle analysis was completed using flow cytometry. A flank model, a cerebellar model, and a model of leptomeningeal metastasis using human medulloblastoma PDX cells was used to assess the in vivo effects of UAB30 and RA. RESULTS UAB30 treatment led to cell differentiation and decreased medulloblastoma PDX cell viability, proliferation, migration and invasion and G1 cell cycle arrest in all three PDXs similar to RA. UAB30 and RA treatment of mice bearing medulloblastoma PDX tumors resulted in a significant decrease in tumor growth and metastasis compared to vehicle treated animals. CONCLUSIONS UAB30 decreased viability, proliferation, and motility in group 3 medulloblastoma PDX cells and significantly decreased tumor growth in vivo in a fashion similar to RA, suggesting that further investigations into the potential therapeutic application of UAB30 for medulloblastoma are warranted.
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Affiliation(s)
- Evan F Garner
- Division of Pediatric Surgery, Department of Surgery, University of Alabama, Birmingham, Birmingham, AL, USA
| | - Laura L Stafman
- Division of Pediatric Surgery, Department of Surgery, University of Alabama, Birmingham, Birmingham, AL, USA
| | - Adele P Williams
- Division of Pediatric Surgery, Department of Surgery, University of Alabama, Birmingham, Birmingham, AL, USA
| | - Jamie M Aye
- Division of Pediatric Hematology Oncology, Department of Pediatrics, University of Alabama, Birmingham, Birmingham, AL, USA
| | - Caroline Goolsby
- Division of Pediatric Surgery, Department of Surgery, University of Alabama, Birmingham, Birmingham, AL, USA
| | - Venkatram R Atigadda
- Department of Dermatology, University of Alabama, Birmingham, Birmingham, AL, USA
| | - Blake P Moore
- Division of Pediatric Hematology Oncology, Department of Pediatrics, University of Alabama, Birmingham, Birmingham, AL, USA
| | - Li Nan
- Division of Pediatric Hematology Oncology, Department of Pediatrics, University of Alabama, Birmingham, Birmingham, AL, USA
| | - Jerry E Stewart
- Division of Pediatric Surgery, Department of Surgery, University of Alabama, Birmingham, Birmingham, AL, USA
| | - Anita B Hjelmeland
- Department of Cell, Developmental and Integrative Biology, University of Alabama, Birmingham, Birmingham, AL, USA
| | - Gregory K Friedman
- Division of Pediatric Hematology Oncology, Department of Pediatrics, University of Alabama, Birmingham, Birmingham, AL, USA
| | - Elizabeth A Beierle
- Division of Pediatric Surgery, Department of Surgery, University of Alabama, Birmingham, Birmingham, AL, USA.
- , Birmingham, USA.
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13
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Chou CF, Hsieh YH, Grubbs CJ, Atigadda VR, Mobley JA, Dummer R, Muccio DD, Eto I, Elmets CA, Garvey WT, Chang PL. The retinoid X receptor agonist, 9-cis UAB30, inhibits cutaneous T-cell lymphoma proliferation through the SKP2-p27kip1 axis. J Dermatol Sci 2018; 90:343-356. [PMID: 29599065 PMCID: PMC6329374 DOI: 10.1016/j.jdermsci.2018.03.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 02/15/2018] [Accepted: 03/08/2018] [Indexed: 01/09/2023]
Abstract
BACKGROUND Bexarotene (Targretin®) is currently the only FDA approved retinoid X receptor (RXR) -selective agonist for the treatment of cutaneous T-cell lymphomas (CTCLs). The main side effects of bexarotene are hypothyroidism and elevation of serum triglycerides (TGs). The novel RXR ligand, 9-cis UAB30 (UAB30) does not elevate serum TGs or induce hypothyroidism in normal subjects. OBJECTIVES To assess preclinical efficacy and mechanism of action of UAB30 in the treatment of CTCLs and compare its action with bexarotene. METHODS With patient-derived CTCL cell lines, we evaluated UAB30 function in regulating growth, apoptosis, cell cycle check points, and cell cycle-related markers. RESULTS Compared to bexarotene, UAB30 had lower half maximal inhibitory concentration (IC50) values and was more effective in inhibiting the G1 cell cycle checkpoint. Both rexinoids increased the stability of the cell cycle inhibitor, p27kip1 protein, in part, through targeting components involved in the ubiquitination-proteasome system: 1) decreasing SKP2, a F-box protein that binds and targets p27kip1 for degradation by 26S proteasome and 2) suppressing 20S proteasome activity (cell line-dependent) through downregulation of PSMA7, a component of the 20S proteolytic complex in 26S proteasome. CONCLUSIONS UAB30 and bexarotene induce both early cell apoptosis and suppress cell proliferation. Inhibition of the G1 to S cell cycle transition by rexinoids is mediated, in part, through downregulation of SKP2 and/or 20S proteasome activity, leading to increased p27kip1 protein stability. Because UAB30 has minimal effect in elevating serum TGs and inducing hypothyroidism, it is potentially a better alternative to bexarotene for the treatment of CTCLs.
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Affiliation(s)
- Chu-Fang Chou
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA
| | - Yu-Hua Hsieh
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA
| | - Clinton J Grubbs
- Department of Surgery, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA; Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA
| | - Venkatram R Atigadda
- Department of Dermatology, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA
| | - James A Mobley
- Department of Surgery, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA
| | - Reinhard Dummer
- Department of Dermatology, University Hospital of Zurich, Switzerland
| | - Donald D Muccio
- Department of Biochemistry, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA; Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA
| | - Isao Eto
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA; Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA
| | - Craig A Elmets
- Department of Dermatology, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA; Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA
| | - W Timothy Garvey
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA
| | - Pi-Ling Chang
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA; Department of Dermatology, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA; Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA.
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14
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Heck MC, Wagner CE, Shahani PH, MacNeill M, Grozic A, Darwaiz T, Shimabuku M, Deans DG, Robinson NM, Salama SH, Ziller JW, Ma N, van der Vaart A, Marshall PA, Jurutka PW. Modeling, Synthesis, and Biological Evaluation of Potential Retinoid X Receptor (RXR)-Selective Agonists: Analogues of 4-[1-(3,5,5,8,8-Pentamethyl-5,6,7,8-tetrahydro-2-naphthyl)ethynyl]benzoic Acid (Bexarotene) and 6-(Ethyl(5,5,8,8-tetrahydronaphthalen-2-yl)amino)nicotinic Acid (NEt-TMN). J Med Chem 2016; 59:8924-8940. [DOI: 10.1021/acs.jmedchem.6b00812] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Michael C. Heck
- School
of Mathematical and Natural Sciences, New College of Interdisciplinary
Arts and Sciences, Arizona State University, 4701 West Thunderbird Road, Glendale, Arizona 85306, United States
| | - Carl E. Wagner
- School
of Mathematical and Natural Sciences, New College of Interdisciplinary
Arts and Sciences, Arizona State University, 4701 West Thunderbird Road, Glendale, Arizona 85306, United States
| | - Pritika H. Shahani
- School
of Mathematical and Natural Sciences, New College of Interdisciplinary
Arts and Sciences, Arizona State University, 4701 West Thunderbird Road, Glendale, Arizona 85306, United States
| | - Mairi MacNeill
- School
of Mathematical and Natural Sciences, New College of Interdisciplinary
Arts and Sciences, Arizona State University, 4701 West Thunderbird Road, Glendale, Arizona 85306, United States
| | - Aleksandra Grozic
- School
of Mathematical and Natural Sciences, New College of Interdisciplinary
Arts and Sciences, Arizona State University, 4701 West Thunderbird Road, Glendale, Arizona 85306, United States
| | - Tamana Darwaiz
- School
of Mathematical and Natural Sciences, New College of Interdisciplinary
Arts and Sciences, Arizona State University, 4701 West Thunderbird Road, Glendale, Arizona 85306, United States
| | - Micah Shimabuku
- School
of Mathematical and Natural Sciences, New College of Interdisciplinary
Arts and Sciences, Arizona State University, 4701 West Thunderbird Road, Glendale, Arizona 85306, United States
| | - David G. Deans
- School
of Mathematical and Natural Sciences, New College of Interdisciplinary
Arts and Sciences, Arizona State University, 4701 West Thunderbird Road, Glendale, Arizona 85306, United States
| | - Nathan M. Robinson
- School
of Mathematical and Natural Sciences, New College of Interdisciplinary
Arts and Sciences, Arizona State University, 4701 West Thunderbird Road, Glendale, Arizona 85306, United States
| | - Samer H. Salama
- School
of Mathematical and Natural Sciences, New College of Interdisciplinary
Arts and Sciences, Arizona State University, 4701 West Thunderbird Road, Glendale, Arizona 85306, United States
| | - Joseph W. Ziller
- Department
of Chemistry, University of California, Irvine, 576 Rowland Hall, Irvine, California 92697, United States
| | - Ning Ma
- Department
of Chemistry, University of South Florida, 4202 East Fowler Avenue, CHE 205, Tampa, Florida 33620, United States
| | - Arjan van der Vaart
- Department
of Chemistry, University of South Florida, 4202 East Fowler Avenue, CHE 205, Tampa, Florida 33620, United States
| | - Pamela A. Marshall
- School
of Mathematical and Natural Sciences, New College of Interdisciplinary
Arts and Sciences, Arizona State University, 4701 West Thunderbird Road, Glendale, Arizona 85306, United States
| | - Peter W. Jurutka
- School
of Mathematical and Natural Sciences, New College of Interdisciplinary
Arts and Sciences, Arizona State University, 4701 West Thunderbird Road, Glendale, Arizona 85306, United States
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15
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Retinoid X Receptor Agonists Upregulate Genes Responsible for the Biosynthesis of All-Trans-Retinoic Acid in Human Epidermis. PLoS One 2016; 11:e0153556. [PMID: 27078158 PMCID: PMC4831765 DOI: 10.1371/journal.pone.0153556] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Accepted: 03/31/2016] [Indexed: 11/26/2022] Open
Abstract
UAB30 is an RXR selective agonist that has been shown to have potential cancer chemopreventive properties. Due to high efficacy and low toxicity, it is currently being evaluated in human Phase I clinical trials by the National Cancer Institute. While UAB30 shows promise as a low toxicity chemopreventive drug, the mechanism of its action is not well understood. In this study, we investigated the effects of UAB30 on gene expression in human organotypic skin raft cultures and mouse epidermis. The results of this study indicate that treatment with UAB30 results in upregulation of genes responsible for the uptake and metabolism of all-trans-retinol to all-trans-retinoic acid (ATRA), the natural agonist of RAR nuclear receptors. Consistent with the increased expression of these genes, the steady-state levels of ATRA are elevated in human skin rafts. In ultraviolet B (UVB) irradiated mouse skin, the expression of ATRA target genes is found to be reduced. A reduced expression of ATRA sensitive genes is also observed in epidermis of mouse models of UVB-induced squamous cell carcinoma and basal cell carcinomas. However, treatment of mouse skin with UAB30 prior to UVB irradiation prevents the UVB-induced decrease in expression of some of the ATRA-responsive genes. Considering its positive effects on ATRA signaling in the epidermis and its low toxicity, UAB30 could be used as a chemoprophylactic agent in the treatment of non-melanoma skin cancer, particularly in organ transplant recipients and other high risk populations.
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16
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Atigadda VR, Xia G, Deshpande A, Wu L, Kedishvili N, Smith CD, Krontiras H, Bland KI, Grubbs CJ, Brouillette WJ, Muccio DD. Conformationally Defined Rexinoids and Their Efficacy in the Prevention of Mammary Cancers. J Med Chem 2015; 58:7763-74. [PMID: 26331194 DOI: 10.1021/acs.jmedchem.5b00829] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
(2E,4E,6Z,8Z)-8-(3',4'-Dihydro-1'(2H)-naphthalen-1'-ylidene)-3,7-dimethyl-2,3,6-octatrienoinic acid (UAB30) is currently undergoing clinical evaluation as a novel cancer prevention agent. In efforts to develop even more highly potent rexinoids that prevent breast cancer without toxicity, we further explore here the structure-activity relationship of two separate classes of rexinoids. UAB30 belongs to the class II rexinoids and possesses a 9Z-tetraenoic acid chain bonded to a tetralone ring, whereas the class I rexinoids contain the same 9Z-tetraenoic acid chain bonded to a disubstituted cyclohexenyl ring. Among the 12 class I and class II rexinoids evaluated, the class I rexinoid 11 is most effective in preventing breast cancers in an in vivo rat model alone or in combination with tamoxifen. Rexinoid 11 also reduces the size of established tumors and exhibits a therapeutic effect. However, 11 induces hypertriglyceridemia at its effective dose. On the other hand rexinoid 10 does not increase triglyceride levels while being effective in the in vivo chemoprevention assay. X-ray studies of four rexinoids bound to the ligand binding domain of the retinoid X receptor reveal key structural aspects that enhance potency as well as those that enhance the synthesis of lipids.
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Affiliation(s)
- Venkatram R Atigadda
- Departments of †Chemistry, ‡Biochemistry and Molecular Genetics, §Vision Sciences, and ∥Surgery, University of Alabama at Birmingham , Birmingham, Alabama 35294, United States
| | - Gang Xia
- Departments of †Chemistry, ‡Biochemistry and Molecular Genetics, §Vision Sciences, and ∥Surgery, University of Alabama at Birmingham , Birmingham, Alabama 35294, United States
| | - Anil Deshpande
- Departments of †Chemistry, ‡Biochemistry and Molecular Genetics, §Vision Sciences, and ∥Surgery, University of Alabama at Birmingham , Birmingham, Alabama 35294, United States
| | - Lizhi Wu
- Departments of †Chemistry, ‡Biochemistry and Molecular Genetics, §Vision Sciences, and ∥Surgery, University of Alabama at Birmingham , Birmingham, Alabama 35294, United States
| | - Natalia Kedishvili
- Departments of †Chemistry, ‡Biochemistry and Molecular Genetics, §Vision Sciences, and ∥Surgery, University of Alabama at Birmingham , Birmingham, Alabama 35294, United States
| | - Craig D Smith
- Departments of †Chemistry, ‡Biochemistry and Molecular Genetics, §Vision Sciences, and ∥Surgery, University of Alabama at Birmingham , Birmingham, Alabama 35294, United States
| | - Helen Krontiras
- Departments of †Chemistry, ‡Biochemistry and Molecular Genetics, §Vision Sciences, and ∥Surgery, University of Alabama at Birmingham , Birmingham, Alabama 35294, United States
| | - Kirby I Bland
- Departments of †Chemistry, ‡Biochemistry and Molecular Genetics, §Vision Sciences, and ∥Surgery, University of Alabama at Birmingham , Birmingham, Alabama 35294, United States
| | - Clinton J Grubbs
- Departments of †Chemistry, ‡Biochemistry and Molecular Genetics, §Vision Sciences, and ∥Surgery, University of Alabama at Birmingham , Birmingham, Alabama 35294, United States
| | - Wayne J Brouillette
- Departments of †Chemistry, ‡Biochemistry and Molecular Genetics, §Vision Sciences, and ∥Surgery, University of Alabama at Birmingham , Birmingham, Alabama 35294, United States
| | - Donald D Muccio
- Departments of †Chemistry, ‡Biochemistry and Molecular Genetics, §Vision Sciences, and ∥Surgery, University of Alabama at Birmingham , Birmingham, Alabama 35294, United States
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17
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di Masi A, Leboffe L, De Marinis E, Pagano F, Cicconi L, Rochette-Egly C, Lo-Coco F, Ascenzi P, Nervi C. Retinoic acid receptors: from molecular mechanisms to cancer therapy. Mol Aspects Med 2015; 41:1-115. [PMID: 25543955 DOI: 10.1016/j.mam.2014.12.003] [Citation(s) in RCA: 243] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 12/15/2014] [Indexed: 02/07/2023]
Abstract
Retinoic acid (RA), the major bioactive metabolite of retinol or vitamin A, induces a spectrum of pleiotropic effects in cell growth and differentiation that are relevant for embryonic development and adult physiology. The RA activity is mediated primarily by members of the retinoic acid receptor (RAR) subfamily, namely RARα, RARβ and RARγ, which belong to the nuclear receptor (NR) superfamily of transcription factors. RARs form heterodimers with members of the retinoid X receptor (RXR) subfamily and act as ligand-regulated transcription factors through binding specific RA response elements (RAREs) located in target genes promoters. RARs also have non-genomic effects and activate kinase signaling pathways, which fine-tune the transcription of the RA target genes. The disruption of RA signaling pathways is thought to underlie the etiology of a number of hematological and non-hematological malignancies, including leukemias, skin cancer, head/neck cancer, lung cancer, breast cancer, ovarian cancer, prostate cancer, renal cell carcinoma, pancreatic cancer, liver cancer, glioblastoma and neuroblastoma. Of note, RA and its derivatives (retinoids) are employed as potential chemotherapeutic or chemopreventive agents because of their differentiation, anti-proliferative, pro-apoptotic, and anti-oxidant effects. In humans, retinoids reverse premalignant epithelial lesions, induce the differentiation of myeloid normal and leukemic cells, and prevent lung, liver, and breast cancer. Here, we provide an overview of the biochemical and molecular mechanisms that regulate the RA and retinoid signaling pathways. Moreover, mechanisms through which deregulation of RA signaling pathways ultimately impact on cancer are examined. Finally, the therapeutic effects of retinoids are reported.
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Affiliation(s)
- Alessandra di Masi
- Department of Science, Roma Tre University, Viale Guglielmo Marconi 446, Roma I-00146, Italy
| | - Loris Leboffe
- Department of Science, Roma Tre University, Viale Guglielmo Marconi 446, Roma I-00146, Italy
| | - Elisabetta De Marinis
- Department of Medical and Surgical Sciences and Biotechnologies, University of Roma "La Sapienza", Corso della Repubblica 79, Latina I-04100
| | - Francesca Pagano
- Department of Medical and Surgical Sciences and Biotechnologies, University of Roma "La Sapienza", Corso della Repubblica 79, Latina I-04100
| | - Laura Cicconi
- Department of Biomedicine and Prevention, University of Roma "Tor Vergata", Via Montpellier 1, Roma I-00133, Italy; Laboratory of Neuro-Oncohematology, Santa Lucia Foundation, Via Ardeatina, 306, Roma I-00142, Italy
| | - Cécile Rochette-Egly
- Department of Functional Genomics and Cancer, IGBMC, CNRS UMR 7104 - Inserm U 964, University of Strasbourg, 1 rue Laurent Fries, BP10142, Illkirch Cedex F-67404, France.
| | - Francesco Lo-Coco
- Department of Biomedicine and Prevention, University of Roma "Tor Vergata", Via Montpellier 1, Roma I-00133, Italy; Laboratory of Neuro-Oncohematology, Santa Lucia Foundation, Via Ardeatina, 306, Roma I-00142, Italy.
| | - Paolo Ascenzi
- Interdepartmental Laboratory for Electron Microscopy, Roma Tre University, Via della Vasca Navale 79, Roma I-00146, Italy.
| | - Clara Nervi
- Department of Medical and Surgical Sciences and Biotechnologies, University of Roma "La Sapienza", Corso della Repubblica 79, Latina I-04100.
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Vedell PT, Townsend RR, You M, Malone JP, Grubbs CJ, Bland KI, Muccio DD, Atigadda VR, Chen Y, Vignola K, Lubet RA. Global molecular changes in rat livers treated with
RXR
agonists: a comparison using transcriptomics and proteomics. Pharmacol Res Perspect 2014. [DOI: 10.1002/prp2.74] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Affiliation(s)
- Peter T. Vedell
- Department of Pharmacology Medical College of Wisconsin Cancer Center Milwaukee Wisconsin 53226
| | - Reid R. Townsend
- Department of Internal Medicine Washington University School of Medicine St. Louis Missouri 63110
| | - Ming You
- Department of Pharmacology Medical College of Wisconsin Cancer Center Milwaukee Wisconsin 53226
| | - James P. Malone
- Department of Internal Medicine Washington University School of Medicine St. Louis Missouri 63110
| | - Clinton J. Grubbs
- Department of Surgery University of Alabama at Birmingham Birmingham Alabama 35294
| | - Kirby I. Bland
- Department of Surgery University of Alabama at Birmingham Birmingham Alabama 35294
| | - Donald D. Muccio
- Department of Chemistry University of Alabama at Birmingham Birmingham Alabama 35294
| | - Venkatram R. Atigadda
- Department of Chemistry University of Alabama at Birmingham Birmingham Alabama 35294
| | - Yang Chen
- Department of Science Development Metabolon Research Triangle Park North Carolina 27709
| | - Katie Vignola
- Department of Science Development Metabolon Research Triangle Park North Carolina 27709
| | - Ronald A. Lubet
- Chemoprevention Agent Development Research Group National Cancer Institute Rockville Maryland 20892
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19
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Atigadda VR, Xia G, Desphande A, Boerma LJ, Lobo-Ruppert S, Grubbs CJ, Smith CD, Brouillette WJ, Muccio DD. Methyl substitution of a rexinoid agonist improves potency and reveals site of lipid toxicity. J Med Chem 2014; 57:5370-80. [PMID: 24801499 PMCID: PMC4216212 DOI: 10.1021/jm5004792] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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(2E,4E,6Z,8E)-8-(3′,4′-Dihydro-1′(2′H)-naphthalen-1′-ylidene)-3,7-dimethyl-2,4,6-octatrienoic
acid, 9cUAB30, is a selective rexinoid that displays substantial chemopreventive
capacity with little toxicity. 4-Methyl-UAB30, an analogue of 9cUAB30,
is a potent RXR agonist but caused increased lipid biosynthesis unlike
9cUAB30. To evaluate how methyl substitution influenced potency and
lipid biosynthesis, we synthesized four 9cUAB30 homologues with methyl
substitutions at the 5-, 6-, 7-, or 8-position of the tetralone ring.
The syntheses and biological evaluations of these new analogues are
reported here along with the X-ray crystal structures of each homologue
bound to the ligand binding domain of hRXRα. We demonstrate
that each homologue of 9cUAB30 is a more potent agonist, but only
the 7-methyl-9cUAB30 caused severe hyperlipidemia in rats. On the
basis of the X-ray crystal structures of these new rexinoids and bexarotene
(Targretin) bound to hRXRα-LBD, we reveal that each rexinoid,
which induced hyperlipidemia, had methyl groups that interacted with
helix 7 residues of the LBD.
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Affiliation(s)
- Venkatram R Atigadda
- Departments of †Chemistry, ‡Biochemistry and Molecular Genetics, §Medicine, and ∥Vision Sciences, University of Alabama at Birmingham , Birmingham, Alabama 35294, United States
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20
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Binding affinity and efficacy-based pharmacophore modeling studies of retinoic acid receptor alpha agonists and virtual screening for potential agonists from NCI. Med Chem Res 2014. [DOI: 10.1007/s00044-014-0939-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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21
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Methyl-substituted conformationally constrained rexinoid agonists for the retinoid X receptors demonstrate improved efficacy for cancer therapy and prevention. Bioorg Med Chem 2013; 22:178-85. [PMID: 24359708 DOI: 10.1016/j.bmc.2013.11.039] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Revised: 11/11/2013] [Accepted: 11/20/2013] [Indexed: 11/20/2022]
Abstract
(2E,4E,6Z,8Z)-8-(3',4'-Dihydro-1'(2H)-naphthalen-1'-ylidene)-3,7-dimethyl-2,3,6-octatrienoinic acid, 9cUAB30, is a selective rexinoid for the retinoid X nuclear receptors (RXR). 9cUAB30 displays substantial chemopreventive capacity with little toxicity and is being translated to the clinic as a novel cancer prevention agent. To improve on the potency of 9cUAB30, we synthesized 4-methyl analogs of 9cUAB30, which introduced chirality at the 4-position of the tetralone ring. The syntheses and biological evaluations of the racemic homolog and enantiomers are reported. We demonstrate that the S-enantiomer is the most potent and least toxic even though these enantiomers bind in a similar conformation in the ligand binding domain of RXR.
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22
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Boerma LJ, Xia G, Qui C, Cox BD, Chalmers MJ, Smith CD, Lobo-Ruppert S, Griffin PR, Muccio DD, Renfrow MB. Defining the communication between agonist and coactivator binding in the retinoid X receptor α ligand binding domain. J Biol Chem 2013; 289:814-26. [PMID: 24187139 DOI: 10.1074/jbc.m113.476861] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Retinoid X receptors (RXRs) are obligate partners for several other nuclear receptors, and they play a key role in several signaling processes. Despite being a promiscuous heterodimer partner, this nuclear receptor is a target of therapeutic intervention through activation using selective RXR agonists (rexinoids). Agonist binding to RXR initiates a large conformational change in the receptor that allows for coactivator recruitment to its surface and enhanced transcription. Here we reveal the structural and dynamical changes produced when a coactivator peptide binds to the human RXRα ligand binding domain containing two clinically relevant rexinoids, Targretin and 9-cis-UAB30. Our results show that the structural changes are very similar for each rexinoid and similar to those for the pan-agonist 9-cis-retinoic acid. The four structural changes involve key residues on helix 3, helix 4, and helix 11 that move from a solvent-exposed environment to one that interacts extensively with helix 12. Hydrogen-deuterium exchange mass spectrometry reveals that the dynamics of helices 3, 11, and 12 are significantly decreased when the two rexinoids are bound to the receptor. When the pan-agonist 9-cis-retinoic acid is bound to the receptor, only the dynamics of helices 3 and 11 are reduced. The four structural changes are conserved in all x-ray structures of the RXR ligand-binding domain in the presence of agonist and coactivator peptide. They serve as hallmarks for how RXR changes conformation and dynamics in the presence of agonist and coactivator to initiate signaling.
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23
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Vedell PT, Lu Y, Grubbs CJ, Yin Y, Jiang H, Bland KI, Muccio DD, Cvetkovic D, You M, Lubet R. Effects on gene expression in rat liver after administration of RXR agonists: UAB30, 4-methyl-UAB30, and Targretin (Bexarotene). Mol Pharmacol 2013; 83:698-708. [PMID: 23292798 DOI: 10.1124/mol.112.082404] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Examination of three retinoid X receptor (RXR) agonists [Targretin (TRG), UAB30, and 4-methyl-UAB30 (4-Me-UAB30)] showed that all inhibited mammary cancer in rodents and two (TRG and 4-Me-UAB30) strikingly increased serum triglyceride levels. Agents were administered in diets to female Sprague-Dawley rats. Liver RNA was isolated and microarrayed on the Affymetrix GeneChip Rat Exon 1.0 ST array. Statistical tests identified genes that exhibited differential expression and fell into groups, or modules, with differential expression among agonists. Genes in specific modules were changed by one, two, or all three agonists. An interactome analysis assessed the effects on genes that heterodimerize with known nuclear receptors. For proliferator-activated receptor α/RXR-activated genes, the strongest response was TRG > 4-Me-UAB30 > UAB30. Many liver X receptor/RXR-related genes (e.g., Scd-1 and Srebf1, which are associated with increased triglycerides) were highly expressed in TRG and 4-Me-UAB30- but not UAB30-treated livers. Minimal expression changes were associated with retinoic acid receptor or vitamin D receptor heterodimers by any of the agonists. UAB30 unexpectedly and uniquely activated genes associated with the aryl hydrocarbon hydroxylase (Ah) receptor (Cyp1a1, Cyp1a2, Cyp1b1, and Nqo1). Based on the Ah receptor activation, UAB30 was tested for its ability to prevent dimethylbenzanthracene (DMBA)-induced mammary cancers, presumably by inhibiting DMBA activation, and was highly effective. Gene expression changes were determined by reverse transcriptase-polymerase chain reaction in rat livers treated with Targretin for 2.3, 7, and 21 days. These showed similar gene expression changes at all three time points, arguing some steady-state effect. Different patterns of gene expression among the agonists provided insight into molecular differences and allowed one to predict certain physiologic consequences of agonist treatment.
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Affiliation(s)
- Peter T Vedell
- Medical College of Wisconsin, Cancer Center, Department of Pharmacology Toxicology, Milwaukee, Wisconsin, USA
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24
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Abstract
INTRODUCTION Retinoid X receptors (subtypes RXRα or NR2B1, RXRβ or NR2B2 and RXRγ or NR2B3, which originate from three distinct genes) are promiscuous partners with heterodimeric associations to other members of the Nuclear Receptor (NR) superfamily. Some of the heterodimers are "permissive" and transcriptionally active in the presence of either an RXR ligand ("rexinoid") or a NR partner ligand, whereas others are "non-permissive" and unresponsive to rexinoids alone. In rodent models, rexinoids and partner agonists (mainly PPARγ, LXR, FXR) produce beneficial effects on insulin sensitization, diabetes and obesity, but secondary effects have also been noted, such as a raise in tryglyceride levels, supression of the thyroid hormone axis and induction of hepatomegaly. AREAS COVERED The authors review recent advances in rexinoid design, including further optimization of known scaffolds, and the discovery of novel RXR modulators by virtual ligand screening or from bioactive natural products. The understanding of rexinoid functions in permissive and non-permissive heterodimers is firmly based on structural knowledge. By strenghtening or disrupting the interaction surface with coregulators rexinoids exert agonist or (partial) antagonist activities. The activity state of the heterodimer can also be fine-tuned by the cellular context and the nature of coregulators. EXPERT OPINION The synthetic chemistry toolbox has provided a panel of agonists, partial (ant)agonists and/or heterodimer-selective rexinoids starting from existing, naturally occurring or serendipitously discovered scaffolds. These compounds have an unexplored therapeutic potential that might overcome some of the current limitations of rexinoids in therapy, such as hypertriglyceridemia.
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Affiliation(s)
- Belén Vaz
- Departamento de Química Orgánica, Facultad de Química and Centro de Investigaciones Biomédicas (CINBIO), Universidade de Vigo, Vigo, Spain
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25
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Dawson MI, Xia Z. The retinoid X receptors and their ligands. Biochim Biophys Acta Mol Cell Biol Lipids 2011; 1821:21-56. [PMID: 22020178 DOI: 10.1016/j.bbalip.2011.09.014] [Citation(s) in RCA: 257] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2011] [Revised: 08/23/2011] [Accepted: 09/23/2011] [Indexed: 12/12/2022]
Abstract
This chapter presents an overview of the current status of studies on the structural and molecular biology of the retinoid X receptor subtypes α, β, and γ (RXRs, NR2B1-3), their nuclear and cytoplasmic functions, post-transcriptional processing, and recently reported ligands. Points of interest are the different changes in the ligand-binding pocket induced by variously shaped agonists, the communication of the ligand-bound pocket with the coactivator binding surface and the heterodimerization interface, and recently identified ligands that are natural products, those that function as environmental toxins or drugs that had been originally designed to interact with other targets, as well as those that were deliberately designed as RXR-selective transcriptional agonists, synergists, or antagonists. Of these synthetic ligands, the general trend in design appears to be away from fully aromatic rigid structures to those containing partial elements of the flexible tetraene side chain of 9-cis-retinoic acid. This article is part of a Special Issue entitled Advances in High Density Lipoprotein Formation and Metabolism: A Tribute to John F. Oram (1945-2010).
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Affiliation(s)
- Marcia I Dawson
- Cancer Center, Sanford-Burn Medical Research Institute, 10901 North Torrey Pines Rd., La Jolla, CA 93207, USA.
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26
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The Novel Retinoid, 9cUAB30, Inhibits Telomerase and Induces Apoptosis in HL60 Cells. Transl Oncol 2011; 1:148-52. [PMID: 18795149 DOI: 10.1593/tlo.08142] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2008] [Revised: 07/01/2008] [Accepted: 07/04/2008] [Indexed: 11/18/2022] Open
Abstract
Telomerase, a ribonucleoprotein important to neoplastic immortality, is up-regulated in approximately 85% of cancers, including leukemias. In this study, 9cUAB30, a novel retinoic acid, resulted in differentiation of HL60 leukemia cells as indicated by morphologic changes characteristic of granulocytes. It also caused a down-regulation of hTERT gene expression and a decrease in telomerase activity. Telomerase inhibition was followed by loss of proliferative capacity, induction of apoptosis, and partial differentiation. These findings demonstrate the effectiveness of 9cUAB30 at inhibiting telomerase activity by down-regulating hTERT gene expression in human leukemic cells.
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27
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Kolesar JM, Hoel R, Pomplun M, Havighurst T, Stublaski J, Wollmer B, Krontiras H, Brouillette W, Muccio D, Kim K, Grubbs CJ, Bailey HE. A pilot, first-in-human, pharmacokinetic study of 9cUAB30 in healthy volunteers. Cancer Prev Res (Phila) 2011; 3:1565-70. [PMID: 21149332 DOI: 10.1158/1940-6207.capr-10-0149] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
9cUAB30 is a synthetic analog of 9-cis-retinoic acid with chemopreventive activity in cell lines and in animal models. The purpose of this first-in-human evaluation of 9cUAB30 was to evaluate the single-dose pharmacokinetic profile and toxicity of the compound in healthy volunteers at 3 dose levels. This study enrolled 14 patients to receive a single dose of 5, 10, or 20 mg of 9cUAB30. Plasma and urine samples were collected to assess 9cUAB30 concentrations by a validated LC/MS MS method. 9cUAB30 was well tolerated, with 1 patient experiencing grade 2 toxicity and no grade 3 or 4 toxicities reported. T(max) occurred approximately 3 hours after dose administration with the plasma half-life ranging from 2.79 to 7.21 hours. AUC increased linearly across the examined dose range of 5 to 20 mg; C(max) was proportional to the log of the dose. The plasma clearance ranged from 25 to 39 L/h compared to the renal clearance which ranged from 0.018 to 0.103 L/h. 9cUAB30 has a favorable toxicity and pharmacokinetic profile, with oral availability and primarily hepatic metabolism. Further dose ranging studies with once a day dosing are underway.
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28
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Abstract
Aberrant DNA methylation contributes to the malignant phenotype in virtually all types of cancer, including myeloid leukemia. We hypothesized that CpG island hypermethylation also occurs in juvenile myelomonocytic leukemia (JMML) and investigated whether it is associated with clinical, hematologic, or prognostic features. Based on quantitative measurements of DNA methylation in 127 JMML cases using mass spectrometry (MassARRAY), we identified 4 gene CpG islands with frequent hypermethylation: BMP4 (36% of patients), CALCA (54%), CDKN2B (22%), and RARB (13%). Hypermethylation was significantly associated with poor prognosis: when the methylation data were transformed into prognostic scores using a LASSO Cox regression model, the 5-year overall survival was 0.41 for patients in the top tertile of scores versus 0.72 in the lowest score tertile (P = .002). Among patients given allogeneic hematopoietic stem cell transplantation, the 5-year cumulative incidence of relapse was 0.52 in the highest versus 0.10 in the lowest score tertile (P = .007). In multivariate models, DNA methylation retained prognostic value independently of other clinical risk factors. Longitudinal analyses indicated that some cases acquired a more extensively methylated phenotype at relapse. In conclusion, our data suggest that a high-methylation phenotype characterizes an aggressive biologic variant of JMML and is an important molecular predictor of outcome.
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29
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Kapetanovic IM, Horn TL, Johnson WD, Cwik MJ, Detrisac CJ, McCormick DL. Murine oncogenicity and pharmacokinetics studies of 9-cis-UAB30, an RXR agonist, for breast cancer chemoprevention. Int J Toxicol 2010; 29:157-64. [PMID: 20335511 DOI: 10.1177/1091581809360070] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The synthetic retinoic acid analog, 9-cis-UAB30 [(2E,4E,6Z,8E)-8-(3',4'-dihydro-1'(2'H)-naphthalen-1'-ylidene)-3,7-dimethyl-2,4,6-octatrienoic acid], is a specific ligand for the retinoid X receptor. Murine oncogenicity and pharmacokinetics studies were performed as part of the preclinical development of 9-cis-UAB30 for breast cancer chemoprevention. In the oncogenicity study, TSG-p53((+/-)) (p53 knockout) mice (25 per sex per group) received daily gavage exposure to 9-cis-UAB30 doses of 0 (control), 30, 100, or 300 mg/kg/d for 6 months. Positive controls received p-cresidine (400 mg/kg/d) for 6 months. 9-cis-UAB30 had no biologically significant effects on survival, body weight, body weight gain, clinical signs, hematology, or clinical chemistry but induced dose-related hepatomegaly in both sexes and decreased thymus weights in high-dose females. Gross and microscopic pathology provided no evidence of 9-cis-UAB30 toxicity or oncogenicity; by contrast, p-cresidine induced urinary bladder neoplasms in more than 60% of male and female mice. It was concluded that 9-cis-UAB30 is not oncogenic in p53((+/-)) mice. In the pharmacokinetics study, C57BL/6 mice received daily gavage exposure to 9-cis-UAB30 (100 or 300 mg/kg/d) for 1 or 7 days. Pharmacokinetic parameters were similar after 1 and 7 days of dosing. Dose-related peak plasma levels of 9-cis-UAB30 were seen between 0.25 and 3 hours; volume of distribution was comparable at both dose levels. Increases in area under the curve were less than proportional to dose and were associated with an increased rate of apparent clearance and decreased elimination half-life. These results suggest decreased absorption and/or possible induction of clearance mechanisms. Enzyme induction may underlie the hepatomegaly seen in mice treated with 9-cis-UAB30 for 6 months in the oncogenicity study.
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30
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Jiang W, Deng W, Bailey SK, Nail CD, Frost AR, Brouillette WJ, Muccio DD, Grubbs CJ, Ruppert JM, Lobo-Ruppert SM. Prevention of KLF4-mediated tumor initiation and malignant transformation by UAB30 rexinoid. Cancer Biol Ther 2009; 8:289-98. [PMID: 19197145 PMCID: PMC2776760 DOI: 10.4161/cbt.8.3.7486] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The transcription factor KLF4 acts in post-mitotic epithelial cells to promote differentiation and functions in a context-dependent fashion as an oncogene. In the skin KLF4 is co-expressed with the nuclear receptors RARgamma and RXRalpha, and formation of the skin permeability barrier is a shared function of these three proteins. We utilized a KLF4-transgenic mouse model of skin cancer in combination with cultured epithelial cells to examine functional interactions between KLF4 and retinoic acid receptors. In cultured cells, activation of a conditional, KLF4-estrogen receptor fusion protein by 4-hydroxytamoxifen resulted in rapid upregulation of transcripts for nuclear receptors including RARgamma and RXRalpha. We tested retinoids in epithelial cell transformation assays, including an RAR-selective agonist (all-trans RA), an RXR-selective agonist (9-cis UAB30, rexinoid), and a pan agonist (9-cis RA). Unlike for several other genes, transformation by KLF4 was inhibited by each retinoid, implicating distinct nuclear receptor heterodimers as modulators of KLF4 transforming activity. When RXRalpha expression was suppressed by RNAi in cultured cells, transformation was promoted and the inhibitory effect of 9-cis UAB30 was attenuated. Similarly as shown for other mouse models of skin cancer, rexinoid prevented skin tumor initiation resulting from induction of KLF4 in basal keratinocytes. Rexinoid permitted KLF4 expression and KLF4-induced cell cycling, but attenuated the KLF4-induced misexpression of cytokeratin 1 in basal cells. Neoplastic lesions including hyperplasia, dysplasia and squamous cell carcinoma-like lesions were prevented for up to 30 days. Taken together, the results identify retinoid receptors including RXRalpha as ligand-dependent inhibitors of KLF4-mediated transformation or tumorigenesis.
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Affiliation(s)
- Wen Jiang
- Department of Cell Biology, University of Alabama at Birmingham, Birmingham, AL, USA
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31
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Morishita KI, Yakushiji N, Ohsawa F, Takamatsu K, Matsuura N, Makishima M, Kawahata M, Yamaguchi K, Tai A, Sasaki K, Kakuta H. Replacing alkyl sulfonamide with aromatic sulfonamide in sulfonamide-type RXR agonists favors switch towards antagonist activity. Bioorg Med Chem Lett 2008; 19:1001-3. [PMID: 19095448 DOI: 10.1016/j.bmcl.2008.11.086] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2008] [Revised: 11/12/2008] [Accepted: 11/18/2008] [Indexed: 11/29/2022]
Abstract
Retinoid X receptor (RXR) ligands are attractive candidates for clinical application because of their activity against tamoxifen-resistant breast cancer, taxol-resistant lung cancer, metabolic syndrome, and allergy. Though several RXR ligands, especially RXR antagonists, have been reported, the rational molecular design of such compounds is not well advanced. 4-[N-Methanesulfonyl-N-(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-2-naphthyl)amino]nicotinic acid (5a) is a moderately RXRalpha-preferential agonist, and we examined the feasibility of replacing the methyl group on the sulfonamide with a longer alkyl chain or an aromatic ring as an approach to produce new RXR antagonists. Several of the resulting benzenesulfonanilide-type compounds showed RXR antagonist activity. This design strategy should be a useful approach for addressing the lack of structure diversity of RXR antagonists.
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Affiliation(s)
- Ken-ichi Morishita
- Division of Pharmaceutical Sciences, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 1-1-1, Tsushima-Naka, Okayama 700-8530, Japan
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32
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Grubbs CJ, Lubet RA, Atigadda VR, Christov K, Deshpande AM, Tirmal V, Xia G, Bland KI, Eto I, Brouillette WJ, Muccio DD. Efficacy of new retinoids in the prevention of mammary cancers and correlations with short-term biomarkers. Carcinogenesis 2005; 27:1232-9. [PMID: 16344269 DOI: 10.1093/carcin/bgi308] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
A number of retinoid X receptor (RXR) agonists have proven to be highly effective in preventing methylnitrosourea (MNU) induced mammary cancers. However, these agonists have side effects; particularly causing an increase in serum triglyceride levels. A series of ligands for RXR were designed based on computer modeling to the ligand binding domain (LBD) of the RXR receptors and on structure-activity relationships. The chemopreventive effects of these retinoids were evaluated in the relatively long-term MNU model. As a short-term assay to predict their efficacy, the ability of the retinoids to modulate cell proliferation and apoptosis was also determined in mammary cancers after only 7 days of treatment. The five UAB retinoids evaluated included two Class I UAB retinoids (UAB20, UAB112) and three Class II UAB retinoids (UAB30, 4-methyl-UAB30 and the benzosuberone-analog of UAB30). The previously evaluated RXR agonist targretin and the pan-agonist 9-cis-retinoic acid (9-cis-RA), which interacts with both RAR and RXR receptors, were included as positive agonists known to prevent cancer in the MNU model. In the prevention studies, in which the agents were administered beginning 5 days after MNU until the end of the study, targretin (150 mg/kg diet) and 4-methyl-UAB30 (200 mg/kg diet) were highly effective in decreasing cancer numbers by 75-85%. UAB30 (200 mg/kg diet) and 9-cis-RA (60 mg/kg diet) gave intermediate inhibitions of 60 and 45%, respectively. Targretin (15 mg/kg diet), UAB20 (200 mg/kg diet) and the benzosuberone analog of UAB30 (200 mg/kg diet) showed limited activity by decreasing cancer multiplicity 25-30%, while UAB112 had no effect on mammary cancer multiplicity. A direct correlation was observed between the long-term chemopreventive efficacy of these agents and their ability to decrease cell proliferation in mammary cancers after short-term treatment. Furthermore, the highly effective agents (4-methyl-UAB30 and targretin at 150 mg/kg diet) increased apoptosis 3-5 times, while agents with moderate or limited preventive efficacy failed to significantly increase apoptosis. Although the more effective retinoid treatments increased serum triglycerides 2.5- to 4.0-fold, one moderately effective agent (UAB30) had no significant effect on lipid levels. In summary, a short-term in vivo method has been identified for screening newly synthesized retinoids both for chemopreventive efficacy and for their adverse effect on serum triglycerides.
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Affiliation(s)
- Clinton J Grubbs
- Department of Surgery, University of Alabama at Birmingham, Birmingham, AL 35294-0019, USA.
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33
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Grubbs CJ, Hill DL, Bland KI, Beenken SW, Lin TH, Eto I, Atigadda VR, Vines KK, Brouillette WJ, Muccio DD. 9cUAB30, an RXR specific retinoid, and/or tamoxifen in the prevention of methylnitrosourea-induced mammary cancers. Cancer Lett 2003; 201:17-24. [PMID: 14580682 DOI: 10.1016/s0304-3835(03)00461-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Studies were performed in female Sprague-Dawley rats to determine the efficacy of a new RXR specific retinoid (9cUAB30) when combined with tamoxifen in the prevention of mammary cancers and to determine various pharmacokinetic parameters of the retinoid. When administered by gavage, 9cUAB30 was rapidly absorbed and had a serum t(1/2) of 13.5 h. Since the retinoid was administered in the diet for the chemoprevention study, a 28-day study in which 9cUAB30 was given at dose levels of 200, 400, and 600 mg/kg diet revealed fairly constant serum levels regardless of dose or length of treatment; possibly accounting for the observed low toxicity of this compound. When suboptimal doses of 9cUAB30 were given in the methylnitrosourea (MNU)-induced mammary cancer model, the following average number of mammary cancers were observed: 9cUAB30 (150 mg/kg diet), 4.3; tamoxifen (0.4 mg/kg diet), 4.6; 9cUAB30 (150 mg/kg diet)+tamoxifen (0.4 mg/kg diet), 2.6; and controls, 6.0. Thus, the combination of the agents resulted in an increased effect in preventing mammary cancers; suggesting that cancer cell proliferation was inhibited by the compounds blocking different pathways.
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MESH Headings
- Administration, Oral
- Alkylating Agents/toxicity
- Animals
- Antineoplastic Agents, Hormonal/pharmacology
- Antineoplastic Combined Chemotherapy Protocols/pharmacology
- Body Weight/drug effects
- Chromatography, High Pressure Liquid
- Diet
- Dose-Response Relationship, Drug
- Fatty Acids, Unsaturated/administration & dosage
- Fatty Acids, Unsaturated/blood
- Fatty Acids, Unsaturated/pharmacology
- Female
- Mammary Neoplasms, Experimental/chemically induced
- Mammary Neoplasms, Experimental/drug therapy
- Mammary Neoplasms, Experimental/prevention & control
- Methylnitrosourea/toxicity
- Naphthalenes/administration & dosage
- Naphthalenes/blood
- Naphthalenes/pharmacology
- Rats
- Rats, Sprague-Dawley
- Receptors, Retinoic Acid
- Retinoid X Receptors
- Retinoids/pharmacology
- Tamoxifen/pharmacology
- Transcription Factors
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Affiliation(s)
- Clinton J Grubbs
- Department of Surgery, The University of Alabama at Birmingham, Birmingham, AL 35294, USA.
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Atigadda VR, Vines KK, Grubbs CJ, Hill DL, Beenken SL, Bland KI, Brouillette WJ, Muccio DD. Conformationally defined retinoic acid analogues. 5. Large-scale synthesis and mammary cancer chemopreventive activity for (2E,4E,6Z,8E)-8-(3',4'-dihydro-1'(2'H)-naphthalen-1'-ylidene)-3,7-dimethyl-2,4,6-octatrienoic acid (9cUAB30). J Med Chem 2003; 46:3766-9. [PMID: 12904083 DOI: 10.1021/jm030095q] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Retinoids that activate the nuclear retinoid X receptors (RXRs) display potential for chemoprevention of breast cancer. We previously reported that 9cUAB30 (1) is an RXR-selective retinoid. To explore its in vivo chemopreventive activity, multigram quantities of 1 were needed. Here, we describe a modified synthesis that yields up to 100 g of 1. We further demonstrate that 1 is very effective in the prevention of N-methyl-N-nitrosourea induced mammary cancers in rats without signs of toxicity.
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Affiliation(s)
- Venkatram R Atigadda
- Department of Chemistry, University of Alabama at Birmingham, 901 South 14th Street, Birmingham, AL 35294, USA
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Jones CL, Fish F, Muccio DD. Determination of RNase A/2'-cytidine monophosphate binding affinity and enthalpy by a global fit of thermal unfolding curves. Anal Biochem 2002; 302:184-90. [PMID: 11878796 DOI: 10.1006/abio.2001.5529] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A spectropolarimeter was used to measure the thermal response curves of RNase A in the presence and absence of the ligand cytidine 2'-monophosphate. A coupled equilibrium model was used to describe the dissociation of the protein-ligand complex (NL<==>N + L) and the thermal unfolding of the free protein (N<==>U). The unfolding curves of the protein in the presence of several different concentrations of ligand were fit to this coupled equilibrium model using global linkage analysis. The best-fitted values for the thermal unfolding of the apo-protein were 60.9 +/- 0.2 degrees C (T(m)) and 105.5 +/- 1.4 kcal/mol (DeltaH), while the fitted values for the dissociation of the protein-ligand complex were 1.6 +/- 0.4 microM (K(D)) and 18.7 +/- 1.0 kcal mol(-1) (DeltaH(L)). These values were in excellent agreement with values obtained by other methods. The sensitivity of the data fitting was compared using linear or quadratic temperature dependence for the response curves of the free ligand (L), native apo-protein (N), native ligand-bound protein (NL), and unfolded apo-protein (U). There was no significant improvement in the precision of the fitted data when the temperature-dependent response for each species (N, L, NL, and U) was expressed as quadratic functions of temperature.
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Affiliation(s)
- Cecil L Jones
- Department of Chemistry, University of Alabama at Birmingham, 901 South 14th Street, Alabama 35294, USA
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Smith FO, King R, Nelson G, Wagner JE, Robertson KA, Sanders JE, Bunin N, Emaunel PD, Davies SM. Unrelated donor bone marrow transplantation for children with juvenile myelomonocytic leukaemia. Br J Haematol 2002; 116:716-24. [PMID: 11849238 DOI: 10.1046/j.0007-1048.2001.03333.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Children with juvenile myelomonocytic leukaemia (JMML) have a poor outcome, with survival in a minority of patients. The major limitation on success of sibling donor bone marrow transplantation for JMML has been reported to be relapse. A total of 46 children with a diagnosis of JMML underwent unrelated donor marrow (URD) transplantation facilitated by the National Marrow Donor Program. Forty-three of 46 patients had neutrophil engraftment at a median of 20 d post transplant, with platelet recovery in 28 of 40 evaluable patients at a median of 34.5 d. Thirty-two of 44 evaluable patients developed acute graft-versus-host-disease (GVHD) (Grades 2-4) and chronic GVHD developed in 14 of 35 evaluable patients. At a median follow-up of 2.0 years, probabilities of survival and disease-free survival were 42% and 24% respectively. The probability of relapse was 58% at 2 years and represents the major cause of treatment failure. Multivariate analysis revealed that chronic GVHD was associated with reduced relapse [risk ratio 0.20 (95% CI 0.04-1.02, P=0.05)] improved survival [risk ratio 0.13 (95% CI 0.03-0.68, P=0.02)] and event-free survival [risk ratio 0.23 (95% CI 0.06-0.94, P=0.04)]. This study demonstrates that relapse is the major cause of treatment failure in patients with JMML undergoing URD transplantation. With lower relapse observed in patients with chronic GVHD, new treatment strategies that focus on enhancing the graft-versus-leukaemia effect may improve survival.
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Affiliation(s)
- Franklin O Smith
- Division of Hematology/Oncology, Children's Hospital Medical Center, Cincinnati, OH 45229, USA.
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Berbenni V, Marini A, Bruni G, Cardini A. Thermoanalytical and spectroscopic characterisation of solid-state retinoic acid. Int J Pharm 2001; 221:123-41. [PMID: 11397574 DOI: 10.1016/s0378-5173(01)00677-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Thermoanalytical (differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), thermogravimetric analysis coupled with Fourier transform infrared spectroscopy (TG/FTIR)) and spectroscopic (X-ray diffraction (XRD), ultraviolet-visible (UV-Vis), mass spectrometry (MS) and Fourier transform infrared diffuse reflectance (DRIFT) measurements have been used to characterise solid-state retinoic acid (RA) from a chemico-physical point of view. Between 130 and 160 degrees C, a phase transition takes place that does not correspond to the transition between the known monoclinic and triclinic phases (DSC and XRD evidence). By annealing in air (in the 130-160 degrees C temperature range and for different times), an exothermic oxidative degradation occurs that, depending on the thermal treatment, competes with the mentioned phase transition (TGA evidence). Spectroscopic techniques (UV-Vis, MS and DRIFT) allow one to conclude that the new solid phase is still constituted by retinoic acid with a different orientation of the side chain. Finally, RA does not undergo stable melting: the fragmentation patterns, both in air and in nitrogen, have been examined by TG/FTIR.
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Affiliation(s)
- V Berbenni
- CSGI, Dipartimento di Chimica Fisica, Università di Pavia, Viale Taramelli 16, 27100 Pavia, Italy.
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Abstract
Retinoids (vitamin A and related molecules) are biologic agents that have demonstrated, in preclinical and clinical models, potent activity in the prevention and treatment of a variety of malignancies. Presented in this article is a review of recent clinical studies and correlative laboratory findings that advance our understanding of the biologic basis for the use of retinoids in cancer prevention and treatment.
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Affiliation(s)
- J M Kurie
- Department of Thoracic/Head and Neck Medical Oncology, University of Texas-M.D. Anderson Cancer Center, Houston 77030, USA
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Canan Koch SS, Dardashti LJ, Cesario RM, Croston GE, Boehm MF, Heyman RA, Nadzan AM. Synthesis of retinoid X receptor-specific ligands that are potent inducers of adipogenesis in 3T3-L1 cells. J Med Chem 1999; 42:742-50. [PMID: 10052980 DOI: 10.1021/jm980621r] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel series of oxime ligands has been synthesized that displays potent, specific activation of the retinoid X receptors (RXRs). The oximes of 3-substituted (tetramethyltetrahydronaphthyl)carbonylbenzoic acids are readily available by condensation with hydroxyl- or methoxylamine; alkylation of the hydroxyl oxime provides a variety of analogues. Oximes and variously substituted oxime derivatives demonstrate high binding affinity for the RXRs and specific RXR activation and, hence, are called rexinoids. These oxime rexinoids are activators of the RXR:PPARgamma heterodimer and are potent inducers of differentiation of 3T3-L1 preadipocytes to adipocytes. We have recently reported that ligands which activate the RXR:PPARgamma heterodimer in this manner are effective in the treatment of type II diabetes (non-insulin-dependent diabetes mellitus, NIDDM). Thus, these new oxime rexinoids are potential therapeutic agents for the treatment of metabolic disorders, such as obesity and diabetes.
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Affiliation(s)
- S S Canan Koch
- Departments of Medicinal Chemistry, Retinoid Research, and New Leads Discovery, Ligand Pharmaceuticals, Incorporated, 10255 Science Center Drive, San Diego, California 92121, USA
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