Abstract:
:The role of elevated intracellular calcium concentration [Ca2+]i in the LPS-induced activation of interleukin-1 beta (IL-1 beta) production was examined in cells representing different stages of myeloid differentiation (undifferentiated monocytic leukaemia cell line THP-1, THP-1 cells induced to adherent, macrophage-like cells by phorbol ester treatment and normal peripheral blood-derived adherent monocytes). LPS did not elevate the [Ca2+]i as measured by the Fura-2 fluorescence technique. When these cells were stimulated with LPS in the presence of the calcium ionophore A23187, a clear increase in the IL-1 beta protein production was observed in the undifferentiated THP-1 cells but not in the more differentiated cell types. This ionophore-induced increase was also seen in the IL-1 beta mRNA levels. Thus these data confirm the previous findings demonstrating that elevation of [Ca2+]i is not involved in the LPS-dependent signal transmission. However, the LPS-induced signals are greatly potentiated by the elevated [Ca2+]i, but only in undifferentiated monocytic cells.
journal_name
Scand J Immunoljournal_title
Scandinavian journal of immunologyauthors
Hurme M,Viherluoto J,Nordström Tdoi
10.1111/j.1365-3083.1992.tb02966.xkeywords:
subject
Has Abstractpub_date
1992-09-01 00:00:00pages
507-11issue
3eissn
0300-9475issn
1365-3083journal_volume
36pub_type
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journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
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