Abstract:
:Secretory granules of pancreatic β-cells contain high concentrations of Ca2+ ions that are co-released with insulin in the extracellular milieu upon activation of exocytosis. As a consequence, an increase in the extracellular Ca2+ concentration ([Ca2+]ext) in the microenvironment immediately surrounding β-cells should be expected following the exocytotic event. Using Ca2+-selective microelectrodes we show here that both high glucose and non-nutrient insulinotropic agents elicit a reversible increase of [Ca2+]ext within rat insulinoma (INS-1E) β-cells pseudoislets. The glucose-induced increases in [Ca2+]ext are blocked by pretreatment with different Ca2+ channel blockers. Physiological agonists acting as positive or negative modulators of the insulin secretion and drugs known to intersect the secretory machinery at different levels also induce [Ca2+]ext changes as predicted on the basis of their described action on insulin secretion. Finally, the glucose-induced [Ca2+]ext increase is strongly inhibited after disruption of the actin web, indicating that the dynamic [Ca2+]ext changes recorded in INS-1E pseudoislets by Ca2+-selective microelectrodes occur mainly as a consequence of exocytosis of Ca2+-rich granules. In conclusion, our data directly demonstrate that the extracellular spaces surrounding β-cells constitute a restricted domain where Ca2+ is co-released during insulin exocytosis, creating the basis for an autocrine/paracrine cell-to-cell communication system via extracellular Ca2+ sensors.
journal_name
Cell Calciumjournal_title
Cell calciumauthors
Gerbino A,Maiellaro I,Carmone C,Caroppo R,Debellis L,Barile M,Busco G,Colella Mdoi
10.1016/j.ceca.2012.01.002subject
Has Abstractpub_date
2012-05-01 00:00:00pages
393-401issue
5eissn
0143-4160issn
1532-1991pii
S0143-4160(12)00011-5journal_volume
51pub_type
杂志文章相关文献
CELL CALCIUM文献大全abstract::Quartered pituitaries from castrated (72 h) +/- estradiol (E2)-treated (24 h) rats were used in a perifusion system to investigate estradiol modulation of ionomycin and ionomycin + PMA stimulated LH secretion. Estradiol enhanced the LH responses to GnRH (1 nM) and ionomycin (10 microM), and was necessary for the manif...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/0143-4160(93)90015-x
更新日期:1993-01-01 00:00:00
abstract::Human neutrophils, preloaded with the fluorescent probe, Fura-2, were exposed to Ca2+-releasing agents. The monitored traces of fluorescence were transformed by computer to cytosolic Ca2+ concentration ([ Ca2+]i). Due to quenching of Fura-2, the addition of Mn2+ enabled us to compute the cytosolic concentration of tot...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/0143-4160(89)90025-0
更新日期:1989-10-01 00:00:00
abstract::Recent developments in microscopy and fluorescent indicators now make it possible to monitor the activity and localization of membrane ion channels by imaging Ca(2+) flux through individual channels. Such optical approaches have advantages over electrophysiological single-channel techniques in that they are less invas...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/j.ceca.2004.10.008
更新日期:2005-04-01 00:00:00
abstract::Store operated Ca(2+) entry (SOCE) replenishes intracellular Ca(2+) stores and activates a number of intracellular signalling pathways. Whilst several molecular components forming store operated Ca(2+) channels (SOCC) have been identified, their modulation in neurons remains poorly understood. Here, we extend on our p...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/j.ceca.2012.11.004
更新日期:2013-02-01 00:00:00
abstract::Dynamic nuclear Ca(2+) signals play pivotal roles in diverse cellular functions including gene transcription, cell growth, differentiation, and apoptosis. Here we report a novel nuclear Ca(2+) regulatory mechanism mediated by inositol 1,4,5-trisphosphate receptors (IP(3)Rs) around the nucleus in developing cardiac myo...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/j.ceca.2007.04.017
更新日期:2008-02-01 00:00:00
abstract::In salivary acinar cells, muscarinic-induced fluid secretion is associated with a 1,4,5-IP3 induced increase in the cytosolic free Ca2+ concentration ([Ca2+]i), which in turn activates Ca(2+)-dependent K+ and Cl- channels that modulate the membrane potential. In the present study the influence of the membrane potentia...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/0143-4160(93)90076-i
更新日期:1993-07-01 00:00:00
abstract::Maitotoxin (MTX), a water-soluble polyether obtained from the marine dinoflagellate Gambierdiscus toxicus increased intracellular calcium in a concentration-dependent manner in fibroblasts obtained from human skin. The effect of this toxin was both saturable and of high affinity, showing an apparent half activation co...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/s0143-4160(97)90087-7
更新日期:1997-07-01 00:00:00
abstract::Evidence is accumulating on a key role of T-type channels in neurotransmitter release. Recent works have brought undisputable proofs that T-type channels are capable of controlling hormone and neurotransmitters release in association with exocytosis of large dense-core and synaptic vesicles. T-type channel-secretion c...
journal_title:Cell calcium
pub_type: 杂志文章,评审
doi:10.1016/j.ceca.2006.04.019
更新日期:2006-08-01 00:00:00
abstract::To determine the effects of exposure to reserpine on subcellular Ca2+ transporting systems, active Ca2+ uptake was measured with and without ruthenium red in submandibular gland vesicles obtained from rats after chronic treatment with reserpine. The properties of ruthenium red-sensitive Ca2+ uptake were similar to tho...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/0143-4160(87)90010-8
更新日期:1987-10-01 00:00:00
abstract::Increases in global Ca(2+) in the endothelium are a crucial step in releasing relaxing factors to modulate arterial tone. In the present study we investigated spontaneous Ca(2+) events in endothelial cells, and the contribution of smooth muscle cells to these Ca(2+) events, in pressurized rat mesenteric resistance art...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/j.ceca.2007.11.012
更新日期:2008-08-01 00:00:00
abstract::Rapid formation of high-Ca2+ perimitochondrial cytoplasmic microdomains has been shown to evoke mitochondrial Ca2+ signal and activate mitochondrial dehydrogenases, however, the significance of submicromolar cytoplasmic Ca2+ concentrations in the control of mitochondrial metabolism has not been sufficiently elucidated...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1054/ceca.2001.0264
更新日期:2002-02-01 00:00:00
abstract::Mitochondrial Ca(2+) activates many processes, from mitochondrial metabolism to opening of the permeability transition pore (PTP) and apoptosis. However, there is considerable controversy regarding the free mitochondrial [Ca(2+)] ([Ca(2+)](M)) levels that can be attained during cell activation or even in mitochondrial...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/j.ceca.2008.10.007
更新日期:2009-03-01 00:00:00
abstract::The sternal epithelium of Porcellio scaber was used as a novel model to study the subcellular elemental distribution in control and Ca(2+)-transporting stages in situ. The anterior sternal epithelium (ASE) is specialized for transport of cuticular Ca to sternal CaCO(3) deposits during premolt, and from these deposits ...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/s0143-4160(02)00060-x
更新日期:2002-06-01 00:00:00
abstract::Duchenne muscular dystrophy (DMD) is a progressive muscle disease with severe cardiac complications. It is believed that cellular oxidative stress and augmented Ca(2+) signaling drives the development of cardiac pathology. Some mitochondrial and metabolic dysfunctions have also been reported. Here we investigate cellu...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/j.ceca.2015.04.006
更新日期:2015-08-01 00:00:00
abstract::Cooling can induce Ca(2+) signaling via activation of temperature-sensitive ion channels such as TRPM8, TRPA1 and ryanodine receptor channels. Here we have studied the mechanism of cooling-evoked Ca(2+) signaling in mouse olfactory ensheathing cells (OECs), a specialized type of glial cells in the olfactory nerve laye...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/j.ceca.2012.04.017
更新日期:2012-08-01 00:00:00
abstract::Glucose induces large amplitude oscillations of the cytoplasmic Ca2+ concentration ([Ca2+]i) in pancreatic beta-cells. The effects of temperature on these oscillations were examined by monitoring [Ca2+]i continuously in single beta-cells from ob/ob-mice using dual wavelength microfluorometry. The oscillations of [Ca2+...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/0143-4160(90)90053-w
更新日期:1990-06-01 00:00:00
abstract::Calcium regulates the proliferation and differentiation of keratinocytes both in vivo and in vitro. Elevated extracellular Ca2+ concentration ([Ca2+]o) raises the intracellular free calcium ([Ca2+]i) and activates differentiation-related genes. Cells lacking the calcium-sensing receptor (CaR) fail to respond to [Ca2+]...
journal_title:Cell calcium
pub_type: 杂志文章,评审
doi:10.1016/j.ceca.2003.10.019
更新日期:2004-03-01 00:00:00
abstract::Ca2+ efflux from dog red blood cells loaded with Ca2+ using the A23187 ionophore could be separated into two main components: (1) Mg- and ATP-dependent (active transport) and (2) dependent on external Na (K1/2 around 15 mM); at 80 microM internal free Ca the relative magnitudes of these fluxes were 70% and 30% respect...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/0143-4160(85)90025-9
更新日期:1985-12-01 00:00:00
abstract::Specific sequences (cis-acting elements) in the 3'-untranslated region (UTR) of RNA, together with stabilizing and destabilizing proteins (trans-acting factors), determine the mRNA stability, and consequently, the level of expression of several proteins. Such interactions were discovered initially for short-lived mRNA...
journal_title:Cell calcium
pub_type: 杂志文章,评审
doi:10.1016/j.ceca.2006.04.004
更新日期:2006-10-01 00:00:00
abstract::Numerous lines of evidence indicate that nuclear calcium concentration ([Ca2+]n) may be controlled independently from cytosolic events by a local machinery. In particular, the perinuclear space between the inner nuclear membrane (INM) and the outer nuclear membrane (ONM) of the nuclear envelope (NE) likely serves as a...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/j.ceca.2019.102143
更新日期:2020-03-01 00:00:00
abstract::We tested a mixture of Calcium-Green-1 (CG-1) and Brilliantsulfaflavine (BS) for dual excitation ratiometric measurements of the intracellular free calcium concentration ([Ca2+]i) in bovine adrenal chromaffin cells. Dyes were coloaded (without being molecularly linked to each other) in the whole-cell configuration of ...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/s0143-4160(98)90090-2
更新日期:1998-07-01 00:00:00
abstract::Antigen-mediated mast cell (MC) degranulation is the critical early event in the induction of allergic reactions. Transient receptor potential channels (TRPC), particularly TRPC1, are thought to contribute to such MC activation. To explore the contribution of TRPC1 in MC-driven allergic reactions, we examined antigen-...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/j.ceca.2013.02.001
更新日期:2013-05-01 00:00:00
abstract::Cardiogenesis depends on a tightly regulated balance between proliferation and differentiation of cardiac progenitor cells (CPCs) and their cardiomyocyte descendants. While exposure of early mouse embryos to Ca(2+) channel antagonists has been associated with abnormal cardiac morphogenesis, less is known about the con...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/j.ceca.2014.02.018
更新日期:2014-05-01 00:00:00
abstract::A rapid increase in intracellular calcium directly triggers regulated exocytosis. In addition, changes in intracellular calcium concentration can adjust the extent of exocytosis (quantal content) or the magnitude of individual release events (quantal size) in both the short- and long-term. It is generally agreed that ...
journal_title:Cell calcium
pub_type: 杂志文章,评审
doi:10.1016/j.ceca.2005.06.012
更新日期:2005-09-01 00:00:00
abstract::A whole range of cell functions are regulated by the free cytosolic Ca(2+)concentration. Activator Ca(2+)from the extracellular space enters the cell through various types of Ca(2+)channels and sometimes the Na(+)/Ca(2+)-exchanger, and is actively extruded from the cell by Ca(2+)pumps and Na(+)/Ca(2+)-exchangers. Acti...
journal_title:Cell calcium
pub_type: 杂志文章,评审
doi:10.1054/ceca.2000.0131
更新日期:2000-07-01 00:00:00
abstract::We have used single cell fluorescence imaging techniques to examine how functional properties of the caffeine-sensitive Ca(2+) store change during differentiation of a sub-population of caffeine-sensitive SH-SY5Y cells. Application of caffeine (30 mM) 1-10.5 min after a 'priming' depolarisation pulse of 55 mM K(+) rev...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/j.ceca.2006.06.007
更新日期:2007-03-01 00:00:00
abstract::We have recently shown that freshly isolated astrocytes from the mouse brain express mRNA for the L-channel gene Cav1.3 to at least the same degree (per mg mRNA) as corresponding neurons. The amount of extracellular Ca(2+) actually entering cultured astrocytes by its opening is modest, but due to secondary Ca(2+)-medi...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/j.ceca.2014.01.002
更新日期:2014-03-01 00:00:00
abstract::Stromal interaction molecule (STIM)-1 and -2 are multi-domain, single-pass transmembrane proteins involved in sensing changes in compartmentalized calcium (Ca2+) levels and transducing this cellular signal to Orai1 channel proteins. Our understanding of the molecular mechanisms underlying STIM signaling has been drama...
journal_title:Cell calcium
pub_type: 杂志文章,评审
doi:10.1016/j.ceca.2018.04.006
更新日期:2018-07-01 00:00:00
abstract::The store-operated, calcium release-activated calcium current I(CRAC) is activated by the depletion of inositol 1,4,5-trisphosphate (IP(3))-sensitive stores. The significantly different dose-response relationships of IP(3)-mediated Ca(2+) release and CRAC channel activation indicate that I(CRAC) is activated by a func...
journal_title:Cell calcium
pub_type: 杂志文章
doi:10.1016/j.ceca.2008.12.001
更新日期:2009-04-01 00:00:00
abstract::Animals have evolved sophisticated physiological systems for sensing ambient temperature since changes in environmental temperatures affect various biological processes. Thermosensitive transient receptor potential (thermoTRP) channels serve as thermal sensors in diverse animal species. They are multimodal receptors t...
journal_title:Cell calcium
pub_type: 杂志文章,评审
doi:10.1016/j.ceca.2014.12.001
更新日期:2015-03-01 00:00:00