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Van Aelst B, Devloo R, Zachée P, t'Kindt R, Sandra K, Vandekerckhove P, Compernolle V, Feys HB. Psoralen and Ultraviolet A Light Treatment Directly Affects Phosphatidylinositol 3-Kinase Signal Transduction by Altering Plasma Membrane Packing. J Biol Chem 2016; 291:24364-24376. [PMID: 27687726 DOI: 10.1074/jbc.m116.735126] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 09/17/2016] [Indexed: 01/15/2023] Open
Abstract
Psoralen and ultraviolet A light (PUVA) are used to kill pathogens in blood products and as a treatment of aberrant cell proliferation in dermatitis, cutaneous T-cell lymphoma, and graft-versus-host disease. DNA damage is well described, but the direct effects of PUVA on cell signal transduction are poorly understood. Because platelets are anucleate and contain archetypal signal transduction machinery, they are ideally suited to address this. Lipidomics on platelet membrane extracts showed that psoralen forms adducts with unsaturated carbon bonds of fatty acyls in all major phospholipid classes after PUVA. Such adducts increased lipid packing as measured by a blue shift of an environment-sensitive fluorescent probe in model liposomes. Furthermore, the interaction of these liposomes with lipid order-sensitive proteins like amphipathic lipid-packing sensor and α-synuclein was inhibited by PUVA. In platelets, PUVA caused poor membrane binding of Akt and Bruton's tyrosine kinase effectors following activation of the collagen glycoprotein VI and thrombin protease-activated receptor (PAR) 1. This resulted in defective Akt phosphorylation despite unaltered phosphatidylinositol 3,4,5-trisphosphate levels. Downstream integrin activation was furthermore affected similarly by PUVA following PAR1 (effective half-maximal concentration (EC50), 8.4 ± 1.1 versus 4.3 ± 1.1 μm) and glycoprotein VI (EC50, 1.61 ± 0.85 versus 0.26 ± 0.21 μg/ml) but not PAR4 (EC50, 50 ± 1 versus 58 ± 1 μm) signal transduction. Our findings were confirmed in T-cells from graft-versus-host disease patients treated with extracorporeal photopheresis, a form of systemic PUVA. In conclusion, PUVA increases the order of lipid phases by covalent modification of phospholipids, thereby inhibiting membrane recruitment of effector kinases.
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Affiliation(s)
- Britt Van Aelst
- From the Transfusion Research Center, Belgian Red Cross-Flanders, 9000 Ghent, Belgium
| | - Rosalie Devloo
- From the Transfusion Research Center, Belgian Red Cross-Flanders, 9000 Ghent, Belgium
| | - Pierre Zachée
- the Department of Hematology, Hospital Network Antwerp, 2000 Antwerp, Belgium
| | - Ruben t'Kindt
- the Research Institute for Chromatography, 8500 Kortrijk, Belgium
| | - Koen Sandra
- the Research Institute for Chromatography, 8500 Kortrijk, Belgium
| | - Philippe Vandekerckhove
- the Blood Service of the Belgian Red Cross-Flanders, 2800 Mechelen, Belgium,; the Department of Public Health and Primary Care, KULeuven, 3000 Leuven, Belgium, and; the Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium
| | - Veerle Compernolle
- From the Transfusion Research Center, Belgian Red Cross-Flanders, 9000 Ghent, Belgium,; the Blood Service of the Belgian Red Cross-Flanders, 2800 Mechelen, Belgium,; the Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium
| | - Hendrik B Feys
- From the Transfusion Research Center, Belgian Red Cross-Flanders, 9000 Ghent, Belgium,.
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Marques I, Colaço AR, Costa PJ, Busschaert N, Gale PA, Félix V. Tris-thiourea tripodal-based molecules as chloride transmembrane transporters: insights from molecular dynamics simulations. SOFT MATTER 2014; 10:3608-3621. [PMID: 24663079 DOI: 10.1039/c3sm52140k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The interaction of six tripodal synthetic chloride transmembrane transporters with a POPC bilayer was investigated by means of molecular dynamics simulations using the general Amber force field (GAFF) for the transporters and the LIPID11 force field for phospholipids. These transporters are structurally simple molecules, based on the tris(2-aminoethyl)amine scaffold, containing three thiourea binding units coupled with three n-butyl (1), phenyl (2), fluorophenyl (3), pentafluorophenyl (4), trifluoromethylphenyl (5), or bis(trifluoromethyl)phenyl (6) substituents. The passive diffusion of 1-6⊃ Cl(-) was evaluated with the complexes initially positioned either in the water phase or inside the bilayer. In the first scenario the chloride is released in the water solution before the synthetic molecules achieve the water-lipid interface and permeate the membrane. In the latter one, only when the chloride complex reaches the interface is the anion released to the water phase, with the transporter losing the initial ggg tripodal shape. Independently of the transporter used in the membrane system, the bilayer structure is preserved and the synthetic molecules interact with the POPC molecules at the phosphate headgroup level, via N-H···O hydrogen bonds. Overall, the molecular dynamics simulations' results indicate that the small tripodal molecules in this series have a low impact on the bilayer and are able to diffuse with chloride inside the lipid environment. Indeed, these are essential conditions for these molecules to promote the transmembrane transport as anion carriers, in agreement with experimental efflux data.
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Affiliation(s)
- Igor Marques
- Departamento de Química, CICECO and Secção Autónoma de Ciências da Saúde, Universidade de Aveiro, 3810-193 Aveiro, Portugal.
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Huang X, Zhang R. A Theoretical Rationale why Furan-side Monoadduct is More Favorable Toward Diadduct Formation in 8-Methoxypsoralen and Thymine Complexes. Photochem Photobiol 2013; 89:891-9. [DOI: 10.1111/php.12067] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Accepted: 02/26/2013] [Indexed: 11/30/2022]
Affiliation(s)
- Xuebin Huang
- Key Laboratory of Cluster Science; School of Chemistry; Beijing Institute of Technology; Beijing; China
| | - Rubo Zhang
- Key Laboratory of Cluster Science; School of Chemistry; Beijing Institute of Technology; Beijing; China
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Haynes CJE, Moore SJ, Hiscock JR, Marques I, Costa PJ, Félix V, Gale PA. Tunable transmembrane chloride transport by bis-indolylureas. Chem Sci 2012. [DOI: 10.1039/c2sc20041d] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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