TPEN, a Zn2+/Fe2+ chelator with low affinity for Ca2+, inhibits lamin assembly, destabilizes nuclear architecture and may independently protect nuclei from apoptosis in vitro.

2.50
Hdl Handle:
http://hdl.handle.net/10541/92737
Title:
TPEN, a Zn2+/Fe2+ chelator with low affinity for Ca2+, inhibits lamin assembly, destabilizes nuclear architecture and may independently protect nuclei from apoptosis in vitro.
Authors:
Shumaker, D K; Vann, L R; Goldberg, Martin W; Allen, Terence D; Wilson, K L
Abstract:
We used Xenopus egg extracts to examine the effects of TPEN, a chelator with strong affinities for Zn2+, Fe2+, and Mn2+, on nuclear assembly in vitro. At concentrations above 1 mM, TPEN blocked the assembly of the nuclear lamina and produced nuclei that were profoundly sensitive to stress-induced balloon-like 'shedding' of nuclear membranes away from chromatin-associated membranes. TPEN-arrested nuclei were also defective for DNA replication, which could be explained as secondary to the lack of a lamina. Imaging of TPEN-arrested nuclei by field emission in-lens scanning electron microscopy (FEISEM) revealed clustered, structurally-perturbed nuclear pore complexes. TPEN-arrested nuclei were defective in the accumulation of fluorescent karyophilic proteins. All detectable effects caused by TPEN were downstream of the effects of BAPTA, a Ca2+/Zn2+ chelator that blocks pore complex assembly at two distinct early stages. Surprisingly, TPEN-arrested nuclei, but not control nuclei, remained active for replication in apoptotic extracts, as assayed by [32P]-dCTP incorporation into high molecular weight DNA, suggesting that TPEN blocks a metal-binding protein(s) required for nuclear destruction during programmed cell death.
Affiliation:
Department of Cell Biology and Anatomy, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
Citation:
TPEN, a Zn2+/Fe2+ chelator with low affinity for Ca2+, inhibits lamin assembly, destabilizes nuclear architecture and may independently protect nuclei from apoptosis in vitro., 23 (2-3):151-64 Cell Calcium
Journal:
Cell Calcium
Issue Date:
23-Feb-2010
URI:
http://hdl.handle.net/10541/92737
PubMed ID:
9601611
Type:
Article
Language:
en
ISSN:
0143-4160
Appears in Collections:
All Paterson Institute for Cancer Research

Full metadata record

DC FieldValue Language
dc.contributor.authorShumaker, D Ken
dc.contributor.authorVann, L Ren
dc.contributor.authorGoldberg, Martin Wen
dc.contributor.authorAllen, Terence Den
dc.contributor.authorWilson, K Len
dc.date.accessioned2010-02-23T11:09:55Z-
dc.date.available2010-02-23T11:09:55Z-
dc.date.issued2010-02-23T11:09:55Z-
dc.identifier.citationTPEN, a Zn2+/Fe2+ chelator with low affinity for Ca2+, inhibits lamin assembly, destabilizes nuclear architecture and may independently protect nuclei from apoptosis in vitro., 23 (2-3):151-64 Cell Calciumen
dc.identifier.issn0143-4160-
dc.identifier.pmid9601611-
dc.identifier.urihttp://hdl.handle.net/10541/92737-
dc.description.abstractWe used Xenopus egg extracts to examine the effects of TPEN, a chelator with strong affinities for Zn2+, Fe2+, and Mn2+, on nuclear assembly in vitro. At concentrations above 1 mM, TPEN blocked the assembly of the nuclear lamina and produced nuclei that were profoundly sensitive to stress-induced balloon-like 'shedding' of nuclear membranes away from chromatin-associated membranes. TPEN-arrested nuclei were also defective for DNA replication, which could be explained as secondary to the lack of a lamina. Imaging of TPEN-arrested nuclei by field emission in-lens scanning electron microscopy (FEISEM) revealed clustered, structurally-perturbed nuclear pore complexes. TPEN-arrested nuclei were defective in the accumulation of fluorescent karyophilic proteins. All detectable effects caused by TPEN were downstream of the effects of BAPTA, a Ca2+/Zn2+ chelator that blocks pore complex assembly at two distinct early stages. Surprisingly, TPEN-arrested nuclei, but not control nuclei, remained active for replication in apoptotic extracts, as assayed by [32P]-dCTP incorporation into high molecular weight DNA, suggesting that TPEN blocks a metal-binding protein(s) required for nuclear destruction during programmed cell death.en
dc.language.isoenen
dc.subject.meshAnimals-
dc.subject.meshApoptosis-
dc.subject.meshCalcium-
dc.subject.meshCell Nucleus-
dc.subject.meshChelating Agents-
dc.subject.meshDNA Replication-
dc.subject.meshEgtazic Acid-
dc.subject.meshEthylenediamines-
dc.subject.meshFerrous Compounds-
dc.subject.meshLamins-
dc.subject.meshNuclear Proteins-
dc.subject.meshXenopus-
dc.subject.meshZinc-
dc.titleTPEN, a Zn2+/Fe2+ chelator with low affinity for Ca2+, inhibits lamin assembly, destabilizes nuclear architecture and may independently protect nuclei from apoptosis in vitro.en
dc.typeArticleen
dc.contributor.departmentDepartment of Cell Biology and Anatomy, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.en
dc.identifier.journalCell Calciumen
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