Univerzitetna knjižnica Maribor (UKM)
Knjižnica je med tednom odprta od 8. do 19. ure, ob sobotah od 9. do 13. ure. Čitalnica ČUK je odprta od ponedeljka do sobote od 12. do 24. ure, ob nedeljah od 18. do 24. ure. Informacije: 02 25 07 431, ukm@um.si
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Fusion-activated Ca2+ entry via vesicular P2X4 receptors promotes fusion pore opening and exocytotic content release in pneumocytes [Elektronski vir]Miklavc, Pika ...Ca2+ is considered a key element in multiple steps during regulated exocytosis. During the postfusion phase, an elevated cytoplasmic Ca2+ concentration ([Ca2+])c leads to fusion pore dilation. In ... neurons and neuro endocrine cells, this results from activation of voltage- gated Ca2+ channels in the plasma membrane. However, these channels are activated in the prefusion stage, and little is known about Ca2+ entry mechanisms during the postfusion stage. This may be particularly important for slow and nonexcitable secretory cells. We recently described a Žfusion-activatedŽ Ca2+ entry (FACE) mechanism in alveolar type II (ATII) epithelial cells. FACE follows initial fusion pore opening with a delay of 200-500 ms. The site, molecular mechanisms, and functions of this mechanism remain unknown, however. Here we show that vesicle-associated Ca2+ channels mediate FACE. Using RT-PCR, Western blot analysis, and immunofluorescence, we demonstrate that P2X4 receptors are expressed on exocytotic vesicles known as lamellar bodies (LBs). Electrophysiological, pharmacological, and genetic data confirm that FACE is mediated via these vesicular P2X4 receptors. Furthermore, analysis of fluorophore diffusion into and out of individual vesicles after exocytotic fusion provides evidence that FACE regulates postfusion events of LB exocytosis via P2X4. Fusion pore dilation was clearly correlated with the amplitude of FACE, and content release from fused LBs was accelerated in fusions followed by FACE. Based on these findings, we propose a model for regulation of the exocytotic postfusion phase in nonexcitable cells in which Ca2+ influx via vesicular Ca2+ channels regulates fusion pore expansion and vesicle content release.Vir: Proceedings of the National Academy of Sciences of the United States of America [Elektronski vir]. - ISSN 1091-6490 (Vol. 108, no. 35, 2011, str. 14503-14508)Vrsta gradiva - e-članekLeto - 2011Jezik - angleškiCOBISS.SI-ID - 75510529
Avtor
Miklavc, Pika |
Mair, Norbert |
Wittekindt, Oliver H. |
Haller, Thomas, biolog |
Dietl, Paul |
Felder, Edward |
Timmler, M. |
Frick, Manfred
Teme
fiziologija človeka |
citologija |
secretion |
surfactant |
purinergic |
lung
Vnos na polico
Trajna povezava
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Faktor vpliva
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Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Baze podatkov, v katerih je revija indeksirana
Ime baze podatkov | Področje | Leto |
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Povezave do osebnih bibliografij avtorjev | Povezave do podatkov o raziskovalcih v sistemu SICRIS |
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Miklavc, Pika | 21409 |
Mair, Norbert | |
Wittekindt, Oliver H. | |
Haller, Thomas, biolog | |
Dietl, Paul | |
Felder, Edward | |
Timmler, M. | |
Frick, Manfred |
Vir: Osebne bibliografije
in: SICRIS
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