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Radu-Loghin C, Mocanu K, Al Gouhmani H, Vardavas C, Lagou I, Plyta Z, Papathanasaki A, Vogiatzidaki S, Vardavas A, Tzatzarakis M, Tsatsakis A, Filippidis F, Kyriakos C, Fernandez E, Tigova O, Martinez C, Luque AML, Eremia M, Lotrean LM, Trofor A, Wenzl T, Simpson B, Powell P, Starchenko P, Bakou A, Asimaki E, Vivilaki V. EUREST-RISE: An innovative networking and training project on European Tobacco Control. Tob Prev Cessat 2023; 9:12. [PMID: 37101785 PMCID: PMC10123401 DOI: 10.18332/tpc/163137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 04/13/2023] [Indexed: 04/28/2023]
Affiliation(s)
| | - Karina Mocanu
- European Network for Smoking and Tobacco Prevention, Brussels, Belgium
| | - Hani Al Gouhmani
- European Network for Smoking and Tobacco Prevention, Brussels, Belgium
| | | | - Ioanna Lagou
- School of Medicine, University of Crete, Heraklion, Greece
| | - Zinovia Plyta
- School of Medicine, University of Crete, Heraklion, Greece
| | | | | | | | | | | | | | | | - Esteve Fernandez
- Catalan Institute of Oncology, Spain
- Bellvitge Biomedical Research Institute, Spain
- School of Medicine and Health Sciences, Universitat de Barcelona, Barcelona, Spain
- CIBER of Respiratory Diseases, Spain
| | - Olena Tigova
- Catalan Institute of Oncology, Spain
- Bellvitge Biomedical Research Institute, Spain
- School of Medicine and Health Sciences, Universitat de Barcelona, Barcelona, Spain
- CIBER of Respiratory Diseases, Spain
| | - Cristina Martinez
- Catalan Institute of Oncology, Spain
- Bellvitge Biomedical Research Institute, Spain
- School of Medicine and Health Sciences, Universitat de Barcelona, Barcelona, Spain
- CIBER of Respiratory Diseases, Spain
| | - Anna Mar Lopez Luque
- Catalan Institute of Oncology, Spain
- Bellvitge Biomedical Research Institute, Spain
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Bakou A, Katerina N. Pilot outline of a school-based intervention on tobacco use in a high school of Attica, Greece. Tob Induc Dis 2019. [DOI: 10.18332/tid/112988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Polioudaki H, Kourmouli N, Drosou V, Bakou A, Theodoropoulos PA, Singh PB, Giannakouros T, Georgatos SD. Histones H3/H4 form a tight complex with the inner nuclear membrane protein LBR and heterochromatin protein 1. EMBO Rep 2001; 2:920-5. [PMID: 11571267 PMCID: PMC1084077 DOI: 10.1093/embo-reports/kve199] [Citation(s) in RCA: 136] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have recently shown that heterochromatin protein 1 (HP1) interacts with the nuclear envelope in an acetylation-dependent manner. Using purified components and in vitro assays, we now demonstrate that HP1 forms a quaternary complex with the inner nuclear membrane protein LBR and a sub-set of core histones. This complex involves histone H3/H4 oligomers, which mediate binding of LBR to HP1 and cross-link these two proteins that do not interact directly with each other. Consistent with previous observations, HP1 and LBR binding to core histones is strongly inhibited when H3/H4 are modified by recombinant CREB-binding protein, revealing a new mechanism for anchoring domains of under-acetylated chromatin to the inner nuclear membrane.
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Affiliation(s)
- H Polioudaki
- Department of Basic Sciences, The University of Crete, School of Medicine, 71 110 Heraklion, Crete, Greece
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Kourmouli N, Theodoropoulos PA, Dialynas G, Bakou A, Politou AS, Cowell IG, Singh PB, Georgatos SD. Dynamic associations of heterochromatin protein 1 with the nuclear envelope. EMBO J 2000; 19:6558-68. [PMID: 11101528 PMCID: PMC305850 DOI: 10.1093/emboj/19.23.6558] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
To study the dynamics of mammalian HP1 proteins we have microinjected recombinant forms of mHP1alpha, M31 and M32 into the cytoplasm of living cells. As could be expected from previous studies, the three fusion proteins were efficiently transported into the nucleus and targeted specific chromatin areas. However, before incorporation into these areas the exogenous proteins accumulated in a peripheral zone and associated closely with the nuclear envelope. This transient association did not occur when the cells were treated with deacetylase inhibitors, indicating an acetylation-inhibited interaction. In line with these observations, recombinant HP1 proteins exhibited saturable binding to purified nuclear envelopes and stained the nuclei of detergent-permeabilized cells in a rim-like fashion. Competition experiments with various M31 mutants allowed mapping of the nuclear envelope-binding site within an N-terminal region that includes the chromodomain. A His(6)-tagged peptide representing this region inhibited recruitment of LAP2beta and B-type lamins around the surfaces of condensed chromosomes, suggesting involvement of HP1 proteins in nuclear envelope reassembly.
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Affiliation(s)
- N Kourmouli
- Department of Basic Sciences, The University of Crete School of Medicine, 71 110 Heraklion, Crete, Greece
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Vass I, Sass L, Spetea C, Bakou A, Ghanotakis DF, Petrouleas V. UV-B-induced inhibition of photosystem II electron transport studied by EPR and chlorophyll fluorescence. Impairment of donor and acceptor side components. Biochemistry 1996; 35:8964-73. [PMID: 8688433 DOI: 10.1021/bi9530595] [Citation(s) in RCA: 125] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Inhibition of photosystem II electron transport by UV-B radiation has been studied in isolated spinach photosystem II membrane particles using low-temperature EPR spectroscopy and chlorophyll fluorescence measurements. UV-B irradiation results in the rapid inhibition of oxygen evolution and the decline of variable chlorophyll fluorescence. These effects are accompanied by the loss of the multiline EPR signal arising from the S2 state of the water-oxidizing complex and the induction of Signal IIfast originating from stabilized Try-Z+. The EPR signals from the QA-Fe2+ acceptor complex, Tyr-D+, and the oxidized non-heme iron (Fe3+) are also decreased during the course of UV-B irradiation, but at a significantly slower rate than oxygen evolution and the multiline signal. The decrease of the Fe3+ signal at high g values (g = 8.06, g = 5.6) is accompanied by the induction of another EPR signal at g = 4.26 that arises most likely from the same Fe3+ ion in a modified ligand environment. UV-B irradiation also affects cytochrome b-559. The g = 2.94 EPR signal that arises from the dark- oxidized form is enhanced, whereas the light inducible g = 3.04 signal that arises from the photo-oxidizable population of cytochrome b-559 is diminished. UV-B irradiation also induces the degradation of the D1 reaction center protein. The rate of the D1 protein loss is slower than the inhibition of oxygen evolution and of the multiline signal but follows closely the loss of Signal IIslow, the QA-Fe2+ and the Fe3+ EPR signals, as well as the release of protein-bound manganese. It is concluded from the results that UV-B radiation affects photosystem II redox components at both the donor and acceptor side. The primary damage occurs at the water-oxidizing complex. Modification and/or inactivation of tyrosine-D, cytochrome b-559, and the QAFe2+ acceptor complex are subsequent events that coincide more closely with the UV-B-induced damage to the protein structure of the photosystem II reaction center.
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Affiliation(s)
- I Vass
- Institute of Plant Biology, Biological Research Center, Szeged, Hungary
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