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Poletto V, Galimberti V, Guerra G, Rosti V, Moccia F, Biggiogera M. Fine structural detection of calcium ions by photoconversion. Eur J Histochem 2016; 60:2695. [PMID: 27734989 PMCID: PMC5062637 DOI: 10.4081/ejh.2016.2695] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 07/05/2016] [Accepted: 07/05/2016] [Indexed: 11/22/2022] Open
Abstract
We propose a tool for a rapid high-resolution detection of calcium ions which can be used in parallel with other techniques. We have applied a new approach by photo-oxidation of diaminobenzidine in presence of the emission of an excited fluorochrome specific for calcium detection. This method combines the selectivity of available fluorophores to the high spatial resolution offered by transmission electron microscopy to detect fluorescing molecules even when present in low amounts in membrane-bounded organelles. We show in this paper that Mag-Fura 2 photoconversion via diaminobenzidine oxidation is an efficient way for localizing Ca2+ ions at electron microscopy level, is easily carried out and reproducible, and can be obtained on a good amount of cells, since the exposure in our conditions is not limited to the direct irradiation of the sample via an objective but obtained with a germicide lamp. The end product is sufficiently electron dense to be detected clearly when present in sufficient amount within a membrane boundary.
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Affiliation(s)
- V Poletto
- San Matteo foundation for health, hospitalization and care.
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Barosi G, Klersy C, Villani L, Bonetti E, Catarsi P, Poletto V, Campanelli R, Impera S, Latagliata R, Viarengo G, Carolei A, Massa M, Musso M, Crescimanno A, Gale RP, Rosti V. JAK2(V617F) allele burden ⩾50% is associated with response to ruxolitinib in persons with MPN-associated myelofibrosis and splenomegaly requiring therapy. Leukemia 2016; 30:1772-5. [PMID: 26975727 DOI: 10.1038/leu.2016.45] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- G Barosi
- Center for the Study of Myelofibrosis, Biotechnology Research Area, IRCCS Policlinico S. Matteo Foundation, Pavia, Italy
| | - C Klersy
- Biometry and Clinical Epidemiology, IRCCS Policlinico S. Matteo Foundation, Pavia, Italy
| | - L Villani
- Center for the Study of Myelofibrosis, Biotechnology Research Area, IRCCS Policlinico S. Matteo Foundation, Pavia, Italy
| | - E Bonetti
- Center for the Study of Myelofibrosis, Biotechnology Research Area, IRCCS Policlinico S. Matteo Foundation, Pavia, Italy
| | - P Catarsi
- Center for the Study of Myelofibrosis, Biotechnology Research Area, IRCCS Policlinico S. Matteo Foundation, Pavia, Italy
| | - V Poletto
- Center for the Study of Myelofibrosis, Biotechnology Research Area, IRCCS Policlinico S. Matteo Foundation, Pavia, Italy
| | - R Campanelli
- Center for the Study of Myelofibrosis, Biotechnology Research Area, IRCCS Policlinico S. Matteo Foundation, Pavia, Italy
| | - S Impera
- Hematology, Presidio Ospedaliero Garibaldi-Nesima, Catania, Italy
| | - R Latagliata
- Department of Cellular Biotechnology and Hematology, University of Rome, La Sapienza, Italy
| | - G Viarengo
- Immunohematology and Transfusion Service, IRCCS Policlinico S. Matteo Foundation, Pavia, Italy
| | - A Carolei
- Center for the Study of Myelofibrosis, Biotechnology Research Area, IRCCS Policlinico S. Matteo Foundation, Pavia, Italy
| | - M Massa
- Center for the Study of Myelofibrosis, Biotechnology Research Area, IRCCS Policlinico S. Matteo Foundation, Pavia, Italy
| | - M Musso
- Dipartimento Oncologico 'La Maddalena', UO di Oncologia e Trapianto di Midollo, Palermo, Italy
| | - A Crescimanno
- Dipartimento Oncologico 'La Maddalena', UO di Oncologia e Trapianto di Midollo, Palermo, Italy
| | - R P Gale
- Haematology Research Centre, Division of Experimental Medicine, Department of Medicine, Imperial College London, London, UK
| | - V Rosti
- Center for the Study of Myelofibrosis, Biotechnology Research Area, IRCCS Policlinico S. Matteo Foundation, Pavia, Italy
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Zuccolo E, Lim D, Poletto V, Guerra G, Tanzi F, Rosti V, Moccia F. Acidic Ca2+ stores interact with the endoplasmic reticulum to shape intracellular Ca2+ signals in human endothelial progenitor cells. Vascul Pharmacol 2015. [DOI: 10.1016/j.vph.2015.11.082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Zuccolo E, Poletto V, Guerra G, Rosti V, Moccia F. Arachidonic acid stimulates endothelial progenitor cell proliferation through an increase in Ca2+ concentration and nitric oxide production. Vascul Pharmacol 2015. [DOI: 10.1016/j.vph.2015.11.038] [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: 11/29/2022]
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Piras FM, Nergadze SG, Poletto V, Cerutti F, Ryder OA, Leeb T, Raimondi E, Giulotto E. Phylogeny of horse chromosome 5q in the genus Equus and centromere repositioning. Cytogenet Genome Res 2009; 126:165-72. [PMID: 20016166 DOI: 10.1159/000245916] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/13/2009] [Indexed: 11/19/2022] Open
Abstract
Horses, asses and zebras belong to the genus Equus and are the only extant species of the family Equidae in the order Perissodactyla. In a previous work we demonstrated that a key factor in the rapid karyotypic evolution of this genus was evolutionary centromere repositioning, that is, the shift of the centromeric function to a new position without alteration of the order of markers along the chromosome. In search of previously undiscovered evolutionarily new centromeres, we traced the phylogeny of horse chromosome 5, analyzing the order of BAC markers, derived from a horse genomic library, in 7 Equus species (E. caballus, E. hemionus onager, E. kiang, E. asinus, E. grevyi, E. burchelli and E. zebra hartmannae). This analysis showed that repositioned centromeres are present in E. asinus (domestic donkey, EAS) chromosome 16 and in E. burchelli (Burchell's zebra, EBU) chromosome 17, confirming that centromere repositioning is a strikingly frequent phenomenon in this genus. The observation that the neocentromeres in EAS16 and EBU17 are in the same chromosomal position suggests that they may derive from the same event and therefore, E. asinus and E. burchelli may be more closely related than previously proposed; alternatively, 2 centromere repositioning events, involving the same chromosomal region, may have occurred independently in different lineages, pointing to the possible existence of hot spots for neocentromere formation. Our comparative analysis also showed that, while E. caballus chromosome 5 seems to represent the ancestral configuration, centric fission followed by independent fusion events gave rise to 3 different submetacentric chromosomes in other Equus lineages.
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Affiliation(s)
- F M Piras
- Dipartimento di Genetica e Microbiologia Adriano Buzzati-Traverso, Università di Pavia, Pavia, Italy
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