Linked Life Data

7617445

Source:http://linkedlifedata.com/resource/pubmed/id/7617445

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1995-8-23
pubmed:abstractText
The relationship between the initial increase of intracellular Ca2+ concentration ([Ca2+]i) (measured at the single-cell level with an imaging system) and the ensuing proliferation was examined in a human T cell clone stimulated by a phorbol ester in combination with ionomycin, thapsigargin or an anti-CD3 mAb (monoclonal antibody against the CD3 molecule, UCHT1). From the responses to various ionomycin concentrations, one can define a range of [Ca2+]i values (400-900 nM) which appears optimal for T cell proliferation; lower [Ca2+]i values are suboptimal, higher values are cytotoxic. It was then examined if the [Ca2+]i requirements were similar following anti-CD3 stimulation. [Ca2+]i oscillations elicited by a concentration of UCHT1 (1/1,000) optimal for mitogenicity fall precisely within the 400-900 nM range. However, very low concentrations of UCHT1 (1/100,000) which evoke barely detectable [Ca2+]i responses still cause the cells to proliferate. The possibility that the lower [Ca2+]i requirements observed following anti-CD3 stimulation was due to [Ca2+]i oscillations was tested under conditions which prevented the appearance of these oscillations. It turns out that an oscillatory Ca2+ signal is not more mitogenic than a sustained augmentation of [Ca2+]i. Finally, it was examined if overstimulation via CD3 could have toxic consequences similar to those elicited after ionomycin overstimulation. Large transient [Ca2+]i responses can be observed following anti-CD3 stimulation in appropriate conditions, and namely in T cells pretreated with interleukin-2. These [Ca2+]i augmentations are not cytotoxic. A role for the plasmalemmal Ca2+ pump in the prevention of cytotoxicity can be demonstrated.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0031-6768
pubmed:author
pubmed:issnType
Print
pubmed:volume
429
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
546-54
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
The intracellular Ca2+ concentration optimal for T cell activation is quite different after ionomycin or CD3 stimulation.
pubmed:affiliation
Laboratoire de Neurobiologie, CNRS URA 1857, Ecole Normale Supérieure, Paris, France.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't