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Shaik N, Alhourani E, Bosc A, Liu G, Towhid S, Lupescu A, Lang F. Stimulation of suicidal erythrocyte death by ipratropium bromide. Cell Physiol Biochem 2012; 30:1517-25. [PMID: 23235556 DOI: 10.1159/000343339] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/30/2012] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND/AIMS Ipratropium bromide, an anticholinergic agent widely used in obstructive lung disease, has previously been shown to trigger suicidal death of nucleated cells or apoptosis. Despite their lack of mitochondria and nuclei, key organelles in the execution of apoptosis, erythrocytes may similarly undergo suicidal cell death, which is characterized by cell shrinkage and by cell membrane scrambling with phosphatidylserine-exposure at the cell surface. Triggers of eryptosis include increase of cytosolic Ca(2+)-activity ([Ca(2+)](i)). The present study explored whether ipratropium bromide triggers eryptosis. METHODS [Ca Ca(2+)](i) was estimated utilizing Fluo3 fluorescence, cell volume from forward scatter, phosphatidylserine-exposure from annexin-V-binding, and hemolysis from hemoglobin release. RESULTS A 48 h exposure to ipratropium bromide (1 nM) significantly increased [Ca(2+)](i), decreased forward scatter and increased annexin-V-binding. Ipratropium bromide treatment was followed by slight but significant increase of hemolysis. Removal of extracellular Ca(2+) or inhibition of Ca(2+) permeable cation channels with amiloride (1 mM) virtually abolished cell membrane scrambling. Ca(2+) ionophore ionomycin (1 µM, 30 min) increased the percentage of phosphatidylserine exposing erythrocytes to similarly high levels in the absence and presence of ipratropium bromide (1 nM). CONCLUSIONS Ipratropium bromide triggers suicidal erythrocyte death or eryptosis, an effect mainly due to stimulation of Ca(2+)-entry.
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Affiliation(s)
- Nazneen Shaik
- Department of Physiology, University of Tuebingen, Tuebingen, Germany
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Abstract
BACKGROUND Sulindac sulfide, a non-steroidal anti-inflammatory drug (NSAID), stimulates apoptosis of tumor cells and is thus effective against malignancy. In analogy to apoptosis of nucleated cells, erythrocytes may undergo eryptosis, an apoptosis-like suicidal erythrocyte death, characterized by cell shrinkage and cell membrane scrambling with phosphatidylserine-exposure at the cell surface. Stimulators of eryptosis include increase of cytosolic Ca(2+)-activity ([Ca(2+)](i)) and ceramide formation. The present study explored, whether sulindac sulfide stimulates eryptosis. METHODS [Ca(2+)](i) was estimated from Fluo-3 fluorescence, cell volume from forward scatter, phosphatidylserine-exposure from binding of fluorescent annexin-V, hemolysis from hemoglobin release, and ceramide abundance utilizing fluorescent antibodies. RESULTS A 48 h exposure to sulindac sulfide (≤ 20 µM) was followed by significant increase of [Ca(2+)](i), enhanced ceramide abundance, decreased forward scatter and increased percentage of annexin-V-binding erythrocytes. Sulindac sulfide triggered slight but significant hemolysis. Removal of extracellular Ca(2+) significantly blunted, but did not abrogate the effect of sulindac sulfide (20 µM) on annexin-V-binding. CONCLUSION Sulindac sulfide stimulates the suicidal death of erythrocytes or eryptosis, an effect paralleled by Ca(2+)-entry, ceramide formation, cell shrinkage and phosphatidylserine-exposure.
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Affiliation(s)
- Mohanad Zbidah
- Department of Physiology, University of Tuebingen, Tuebingen, Germany
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Ogée J, Barbour MM, Wingate L, Bert D, Bosc A, Stievenard M, Lambrot C, Pierre M, Bariac T, Loustau D, Dewar RC. A single-substrate model to interpret intra-annual stable isotope signals in tree-ring cellulose. Plant Cell Environ 2009; 32:1071-1090. [PMID: 19422614 DOI: 10.1111/j.1365-3040.2009.01989.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The carbon and oxygen stable isotope composition of wood cellulose (delta(13)C(cellulose) and delta(18)O(cellulose), respectively) reveal well-defined seasonal variations that contain valuable records of past climate, leaf gas exchange and carbon allocation dynamics within the trees. Here, we present a single-substrate model for wood growth to interpret seasonal isotopic signals collected in an even-aged maritime pine plantation growing in South-west France, where climate, soil and flux variables were also monitored. Observed seasonal patterns in delta(13)C(cellulose) and delta(18)O(cellulose) were different between years and individuals, and mostly captured by the model, suggesting that the single-substrate hypothesis is a good approximation for tree ring studies on Pinus pinaster, at least for the environmental conditions covered by this study. A sensitivity analysis revealed that the model was mostly affected by five isotopic discrimination factors and two leaf gas-exchange parameters. Modelled early wood signals were also very sensitive to the date when cell wall thickening begins (t(wt)). Our model could therefore be used to reconstruct t(wt) time series and improve our understanding of how climate influences this key parameter of xylogenesis.
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Affiliation(s)
- J Ogée
- Ephyse, Inra, Bordeaux, BP81, 33883 Villenave d'Ornon, France.
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Paiva JAP, Garnier-Géré PH, Rodrigues JC, Alves A, Santos S, Graça J, Le Provost G, Chaumeil P, Da Silva-Perez D, Bosc A, Fevereiro P, Plomion C. Plasticity of maritime pine (Pinus pinaster) wood-forming tissues during a growing season. New Phytol 2008; 179:1180-1194. [PMID: 18631295 DOI: 10.1111/j.1469-8137.2008.02536.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The seasonal effect is the most significant external source of variation affecting vascular cambial activity and the development of newly divided cells, and hence wood properties. Here, the effect of edapho-climatic conditions on the phenotypic and molecular plasticity of differentiating secondary xylem during a growing season was investigated. Wood-forming tissues of maritime pine (Pinus pinaster) were collected from the beginning to the end of the growing season in 2003. Data from examination of fibre morphology, Fourier-transform infrared spectroscopy (FTIR), analytical pyrolysis, and gas chromatography/mass spectrometry (GC/MS) were combined to characterize the samples. Strong variation was observed in response to changes in edapho-climatic conditions. A genomic approach was used to identify genes differentially expressed during this growing season. Out of 3512 studied genes, 19% showed a significant seasonal effect. These genes were clustered into five distinct groups, the largest two representing genes over-expressed in the early- or late-wood-forming tissues, respectively. The other three clusters were characterized by responses to specific edapho-climatic conditions. This work provides new insights into the plasticity of the molecular machinery involved in wood formation, and reveals candidate genes potentially responsible for the phenotypic differences found between early- and late-wood.
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Affiliation(s)
- J A P Paiva
- INRA, UMR1202, BIOGECO, Domaine de l'Hermitage, 69 route d'Arcachon, F-33612 Cestas Cedex, France
- Université de Bordeaux, UMR1202, BIOGECO, Bât B8 RdC, Av des Facultés, F-33405 Talence, France
- Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. da República-EAN, 2780-157 Oeiras, Portugal
- Tropical Research Institute of Portugal (IICT), Forestry and Forest Products Centre, Tapada da Ajuda, 1349-017 Lisboa, Portugal
| | - P H Garnier-Géré
- INRA, UMR1202, BIOGECO, Domaine de l'Hermitage, 69 route d'Arcachon, F-33612 Cestas Cedex, France
- Université de Bordeaux, UMR1202, BIOGECO, Bât B8 RdC, Av des Facultés, F-33405 Talence, France
| | - J C Rodrigues
- Tropical Research Institute of Portugal (IICT), Forestry and Forest Products Centre, Tapada da Ajuda, 1349-017 Lisboa, Portugal
| | - A Alves
- Tropical Research Institute of Portugal (IICT), Forestry and Forest Products Centre, Tapada da Ajuda, 1349-017 Lisboa, Portugal
| | - S Santos
- Departamento de Engenharia Florestal, Instituto Superior de Agronomia, TULisbon, ISA-DEF, Tapada Ajuda, 1349-017 Lisboa, Portugal
| | - J Graça
- Departamento de Engenharia Florestal, Instituto Superior de Agronomia, TULisbon, ISA-DEF, Tapada Ajuda, 1349-017 Lisboa, Portugal
| | - G Le Provost
- INRA, UMR1202, BIOGECO, Domaine de l'Hermitage, 69 route d'Arcachon, F-33612 Cestas Cedex, France
- Université de Bordeaux, UMR1202, BIOGECO, Bât B8 RdC, Av des Facultés, F-33405 Talence, France
| | - P Chaumeil
- Université de Bordeaux, UMR1202, BIOGECO, Bât B8 RdC, Av des Facultés, F-33405 Talence, France
| | - D Da Silva-Perez
- Laboratoire Bois Process, FCBA InTechFibres, Domaine Universitaire, BP 251, 38044 Grenoble Cedex, France
| | - A Bosc
- INRA, UR Ecologie fonctionnelle et physique de l'Environnement, EPHYSE, 71 avenue Edouard Bourleaux, 33883 Villenave d'Ornon Cedex, France
| | - P Fevereiro
- Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. da República-EAN, 2780-157 Oeiras, Portugal
- Departamento de Biologia Vegetal, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1700 Lisboa, Portugal
| | - C Plomion
- INRA, UMR1202, BIOGECO, Domaine de l'Hermitage, 69 route d'Arcachon, F-33612 Cestas Cedex, France
- Université de Bordeaux, UMR1202, BIOGECO, Bât B8 RdC, Av des Facultés, F-33405 Talence, France
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