Abstract：
:Effects of Pb(2+) on vesicular catecholamine release in intact and ionomycin-permeabilized PC12 cells were investigated using carbon fibre microelectrode amperometry. Changes in intracellular Pb(2+) and Ca(2+) were measured from indo-1 fluorescence by confocal laser scanning microscopy. Depolarization of intact cells and superfusion of permeabilized cells with saline containing > or = 100 microm Ca(2+) rapidly evokes quantal catecholamine release. Superfusion with up to 10 microm Pb(2+) -containing saline evokes release of similar catecholamine quanta after a concentration-dependent delay. Thresholds to induce exocytosis within 30 min of exposure are between 1 and 10 microm Pb(2+) in intact cells and between 10 and 30 nm Pb(2+) in permeabilized cells. Additional inhibition of exocytosis occurs in permeabilized cells exposed to 10 microm Pb(2+). Using membrane-impermeable and -permeable chelators it is demonstrated that intracellular Ca(2+) is not required for Pb(2+) -induced exocytosis. In indo- 1-loaded cells Pb(2+) reduces the fluorescence intensity after a concentration-dependent delay, whereas the fluorescence ratio, indicating intracellular Ca(2+) concentration, remains unchanged. The delay to detect an increase in free intracellular Pb(2+) (> or = 30 nm) is much longer than the delay to Pb(2+) -induced exocytosis, indicating that cytoplasmic components buffer Pb(2+) with high affinity. It is concluded that Pb(2+) acts as a high-affinity substitute for Ca(2+) to trigger essential steps leading to vesicular catecholamine release, which occurs when only approximately 20% of the intracellular high-affinity binding capacity ( approximately 2 attomol/cell) is saturated with Pb(2+).
journal_name
J Neurochemjournal_title
Journal of neurochemistryauthors
Westerink RH,Vijverberg HPdoi
10.1046/j.0022-3042.2001.00751.xkeywords:
subject
Has Abstractpub_date
2002-03-01 00:00:00pages
861-73issue
5eissn
0022-3042issn
1471-4159journal_volume
80pub_type
杂志文章abstract：:Circulating antibody to the bovine white matter proteolipid apoprotein was detected in rabbits 1 month ater a single injection of the water-soluble form of the apoprotein. By double immunodiffusion, the antiserum reacted specifically with the delipidated proteolipid apoprotein and the crude proteolipid fraction contai...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1981.tb02383.x
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.1996.66010006.x
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更新日期：1995-03-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1981.tb04499.x
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pub_type： 杂志文章
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pub_type： 杂志文章,评审
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更新日期：2008-07-01 00:00:00
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journal_title：Journal of neurochemistry
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doi：10.1111/j.1471-4159.1984.tb00922.x
更新日期：1984-08-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.2007.04983.x
更新日期：2008-01-01 00:00:00
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pub_type： 杂志文章
doi：10.1111/j.1471-4159.2008.05703.x
更新日期：2008-12-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.2002.00992.x
更新日期：2002-07-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1986.tb01752.x
更新日期：1986-05-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1985.tb04007.x
更新日期：1985-08-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.1996.67031132.x
更新日期：1996-09-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1990.tb01239.x
更新日期：1990-05-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
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更新日期：2013-07-01 00:00:00
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pub_type： 杂志文章
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更新日期：1999-08-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.2008.05419.x
更新日期：2008-07-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 社论
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更新日期：2016-08-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.2012.07889.x
更新日期：2012-10-01 00:00:00
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pub_type： 杂志文章
doi：10.1046/j.1471-4159.2000.740777.x
更新日期：2000-02-01 00:00:00
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更新日期：2000-04-01 00:00:00
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pub_type： 杂志文章,评审
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更新日期：2021-01-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章,评审
doi：10.1111/j.1471-4159.2011.07248.x
更新日期：2011-06-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章,评审
doi：10.1046/j.1471-4159.2001.00322.x
更新日期：2001-05-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1992.tb10064.x
更新日期：1992-05-01 00:00:00
