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Silva JB, Echeverry JP, Rodrigues dos Santos RC, Ferreira de Paula V, Florindo Guedes MI, Silva BP, Valentini A, Santos Caetano EW, Freire VN. Molecular γ-amino butyric acid and its crystals: Structural, electronic and optical properties. J SOLID STATE CHEM 2023. [DOI: 10.1016/j.jssc.2023.123900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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Bazzurro V, Gatta E, Angeli E, Cupello A, Lange S, Jennische E, Robello M, Diaspro A. Involvement of GABA A receptors containing α 6 subtypes in antisecretory factor activity on rat cerebellar granule cells studied by two-photon uncaging. Eur J Neurosci 2022; 56:4505-4513. [PMID: 35848658 PMCID: PMC9541628 DOI: 10.1111/ejn.15775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 06/11/2022] [Accepted: 07/07/2022] [Indexed: 11/28/2022]
Abstract
The antisecretory factor (AF) is an endogenous protein that counteracts intestinal hypersecretion and various inflammation conditions in vivo. It has been detected in many mammalian tissues and plasma, but its mechanisms of action are largely unknown. To study the pharmacological action of the AF on different GABAA receptor populations in cerebellar granule cells, we took advantage of the two‐photon uncaging method as this technique allows to stimulate the cell locally in well‐identified plasma membrane parts. We compared the electrophysiological response evoked by releasing a caged GABA compound on the soma, the axon initial segment and neurites before and after administering AF‐16, a 16 amino acids long peptide obtained from the amino‐terminal end of the AF protein. After the treatment with AF‐16, we observed peak current increases of varying magnitude depending on the neuronal region. Thus, studying the effects of furosemide and AF‐16 on the electrophysiological behaviour of cerebellar granules, we suggest that GABAA receptors, containing the α6 subunit, may be specifically involved in the increase of the peak current by AF, and different receptor subtype distribution may be responsible for differences in this increase on the cell.
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Affiliation(s)
- Virginia Bazzurro
- DIFILAB, Department of Physics, University of Genoa, Genoa, Italy.,Nanoscopy, CHT Erzelli, Istituto Italiano di Tecnologia, Genoa, Italy
| | - Elena Gatta
- DIFILAB, Department of Physics, University of Genoa, Genoa, Italy
| | - Elena Angeli
- DIFILAB, Department of Physics, University of Genoa, Genoa, Italy
| | - Aroldo Cupello
- DIFILAB, Department of Physics, University of Genoa, Genoa, Italy
| | - Stefan Lange
- Department of Infectious Diseases, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden.,Region Västra Götaland, Department of Clinical Microbiology, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Eva Jennische
- Department of Medical Biochemistry and Cell Biology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Mauro Robello
- DIFILAB, Department of Physics, University of Genoa, Genoa, Italy
| | - Alberto Diaspro
- DIFILAB, Department of Physics, University of Genoa, Genoa, Italy.,Nanoscopy, CHT Erzelli, Istituto Italiano di Tecnologia, Genoa, Italy
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Gatta E, Bazzurro V, Angeli E, Salis A, Damonte G, Cupello A, Robello M, Diaspro A. Electrophysiological study of the effects of side products of RuBi-GABA uncaging on GABA A receptors in cerebellar granule cells. Biomol Concepts 2022; 13:289-297. [DOI: 10.1515/bmc-2022-0022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 05/10/2022] [Indexed: 11/15/2022] Open
Abstract
Abstract
The study of the GABAA receptor itself and its pharmacology is of paramount importance for shedding light on the role of this receptor in the central nervous system. Caged compounds have emerged as powerful tools to support research in this field, as they allow to control, in space and time, the release of neurotransmitters enabling, for example, to map receptors’ distribution and dynamics. Here we focus on γ-aminobutyric acid (GABA)-caged compounds, particularly on a commercial complex called RuBi-GABA, which has high efficiency of uncaging upon irradiation at visible wavelengths. We characterized, by electrophysiological measurements, the effects of RuBi-GABA on GABAA receptors of rat cerebellar granule cells in vitro. In particular, we evaluated the effects of side products obtained after RuBi-GABA photolysis. For this purpose, we developed a procedure to separate the “RuBi-cage” from GABA after uncaging RuBi-GABA with a laser source; then, we compared electrophysiological measurements acquired with and without administering the RuBi-cage in the perfusing bath. In conclusion, to investigate the role of the “cage” molecules both near and far from the cell soma, we compared experiments performed changing the distance of the uncaging point from the cell.
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Affiliation(s)
- Elena Gatta
- Department of Physics, DIFILAB, University of Genoa , via Dodecaneso 33, 16146 , Genoa , Italy
| | - Virginia Bazzurro
- Department of Physics, DIFILAB, University of Genoa , via Dodecaneso 33, 16146 , Genoa , Italy
- Nanoscopy, CHT Erzelli, Istituto Italiano di Tecnologia , via E. Melen, 83, 16152 , Genoa , Italy
| | - Elena Angeli
- Department of Physics, DIFILAB, University of Genoa , via Dodecaneso 33, 16146 , Genoa , Italy
| | - Annalisa Salis
- Department of Experimental Medicine (DIMES), University of Genoa , via L.B. Alberti 2, 16132 , Genoa , Italy
| | - Gianluca Damonte
- Department of Experimental Medicine (DIMES), University of Genoa , via L.B. Alberti 2, 16132 , Genoa , Italy
| | - Aroldo Cupello
- Department of Physics, DIFILAB, University of Genoa , via Dodecaneso 33, 16146 , Genoa , Italy
| | - Mauro Robello
- Department of Physics, DIFILAB, University of Genoa , via Dodecaneso 33, 16146 , Genoa , Italy
| | - Alberto Diaspro
- Department of Physics, DIFILAB, University of Genoa , via Dodecaneso 33, 16146 , Genoa , Italy
- Nanoscopy, CHT Erzelli, Istituto Italiano di Tecnologia , via E. Melen, 83, 16152 , Genoa , Italy
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Filevich O, Etchenique R. Photochemical biosignaling with ruthenium complexes. BIOMEDICAL APPLICATIONS OF INORGANIC PHOTOCHEMISTRY 2022. [DOI: 10.1016/bs.adioch.2022.04.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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