Mostrar el registro sencillo del ítem
Artículo
Hypoxia induces voltage-dependent Ca2+ entry and quantal dopamine secretion in carotid body glomus cells
dc.creator | Ureña López, Juan | |
dc.creator | Fernández-Chacón, Rafael | |
dc.creator | Rodríguez Benot, Alberto | |
dc.creator | Álvarez de Toledo Naranjo, Guillermo | |
dc.creator | López Barneo, José | |
dc.date.accessioned | 2015-01-14T13:52:23Z | |
dc.date.available | 2015-01-14T13:52:23Z | |
dc.date.issued | 1994 | |
dc.identifier.issn | 1091-6490 | es |
dc.identifier.issn | 0027-8424 | es |
dc.identifier.uri | http://hdl.handle.net/11441/17476 | |
dc.description.abstract | We have investigated the changes of cytosolic [Ca2+1 and the secretory -activity in single glomus cells dispersed from rabbit carotid bodies during exposure to solutions with variable 02 tension (Po2). In normoxic conditions (Po2= 145 mmHg; 1 mmHg = 133 Pa), intracellular [Ca2+J was 58 1 29 nM, and switching to lo'iV P02 (between 10 and 60 mmHg) led to a reversible of [Ca2+1 up to 800 nM. The response to hypoxia completely disappeared after removal of external Ca2+ or with the addition of 0.2 mM Cd2+ to the external solution. These same solutions also abolished both the Ca2+ current of the cells and the increase of internal (Ca2+ elicited by hig external K+. Elevations of cytosolic [Ca2e+ in response to hypoxia or to direct membrane depolarization elicited the release of dopamine, which was detected by amperometric techniques. Dopamine secretion occurred in episodes of spike-like activity that appear to represent the release from single secretory vesicles. From the mean charge of well-resolved secretory events, we estimated the average number of dopamine molecules per vesicle to be =140,000, a value about 15 times smaller than a previous estimate in chromaffin granules of adrenomedullary cells. These results directly demonstrate in a single-cell preparation the secretory response of glomus cells to hypoxia. The data indicate that the enhancement of cellular excitability upon exposure to low Po2 results in Ca2+ entry through voltage-gated channels, which leads to an increase in intracellular [Ca2+J and exocytotic transmitter release. | es |
dc.language.iso | eng | es |
dc.relation.ispartof | Proceedings of the National Academy of Sciences of the United States of America, 91 (21), 10208-10211. | es |
dc.rights | Atribución-NoComercial-SinDerivadas 4.0 España | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.title | Hypoxia induces voltage-dependent Ca2+ entry and quantal dopamine secretion in carotid body glomus cells | es |
dc.type | info:eu-repo/semantics/article | es |
dcterms.identifier | https://ror.org/03yxnpp24 | |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.contributor.affiliation | Universidad de Sevilla. Departamento de Fisiología Médica y Biofísica | es |
dc.journaltitle | Proceedings of the National Academy of Sciences of the United States of America | es |
dc.publication.volumen | 91 | es |
dc.publication.issue | 21 | es |
dc.publication.initialPage | 10208 | es |
dc.publication.endPage | 10211 | es |
dc.identifier.idus | https://idus.us.es/xmlui/handle/11441/17476 |
Ficheros | Tamaño | Formato | Ver | Descripción |
---|---|---|---|---|
PNAS-1994-Ureña-10208-11.pdf | 901.6Kb | [PDF] | Ver/ | |