Abstract:
:The inositol phospholipid metabolism and the increase in cytosolic free Ca2+ concentration ([Ca2+]i) into the cell are recognized as two important events in the anti-mu-induced B cell activation. The anti-mu stimulation caused the [3H]inositol incorporation and also a rapid increase in [Ca2+]i from 85 nM to 285 nM. This signal returned to baseline a few minutes after stimulation. By using the fluorescent indicator quin-2 we demonstrated that this [Ca2+]i uptake was derived part from extracellular medium and part from intracellular stores. Both EGTA (a calcium chelator) and TMB.8 (a drug which interferes with Ca2+ sequestration by smooth endoplasmic reticulum) partially suppressed the intracellular Ca2+ uptake and were fully inhibitory when added together. The role of Ca2+ from intracellular stores may also be evidenced in calcium-free experiments, or in permeabilized experiments using exogenous inositol 1,4,5-trisphosphate (IP3, the putative mobilizer of intracellular Ca2+). Preventing the increase in [Ca2+]i also prevents the apparition of early activation makers. These results are consistent with the hypothesis that the Ca2+ increase in B cells stimulated by anti-mu is caused by the generation of IP3 during the phosphatidyl-inositol metabolism and also by the entry of extracellular Ca2+ through the plasma membrane.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Dugas B,Calenda A,Delfraissy JF,Vazquez A,Bach JF,Galanaud Pdoi
10.1002/eji.1830170916subject
Has Abstractpub_date
1987-09-01 00:00:00pages
1323-8issue
9eissn
0014-2980issn
1521-4141journal_volume
17pub_type
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