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Title: Human cytomegalovirus modulates the Ca2+ response to vasopressin and ATP in fibroblast cultures
Authors: Himpens, Bernard ×
Proot, Pieter
Neyts, Johan
De Smedt, Humbert
De Clercq, Erik
Casteels, Rik #
Issue Date: Dec-1995
Series Title: Cell calcium. vol:18 issue:2 pages:111-9
Abstract: The free calcium concentrations in the nucleus ([Ca2+]n) and in cytosol ([Ca2+]c) of cultured human embryonic lung (HEL) fibroblasts were estimated by confocal laser microscopy using the Ca(2+)-indicator Indo-1. In resting HEL cells, The free cellular Ca(2+)-concentration significantly increased upon human cytomegalovirus (HCMV) infection. The ratio between [Ca2+]n and [Ca2+]c was not affected. Following stimulation by ATP or [Arg8] vasopressin (AVP), a differential Ca2+ response of the HCMV-infected HEL cells was observed. While uninfected cells were highly sensitive to AVP and only poorly sensitive to ATP, infected cells showed a high responsiveness to ATP but not to AVP. This switch in sensitivity to the agonists first observed at 24 h post infection. The Ca(2+)-rise following ATP or AVP stimulation was derived from intracellular Ca2+ stores. The magnitude of the ATP-induced Ca(2+)-rise increased upon infection. In contrast to non-infected cells where [Ca2+]n > [Ca2+]c during stimulation with AVP or ATP, no nucleo-cytosolic Ca(2+)-gradient was observed in infected cells. Furthermore, the magnitude of the Ca2+ rise in the two compartments was higher in ATP-stimulated cells. It is concluded that HCMV infection significantly interferes with Ca(2+)-homeostasis in HEL cells which could be related to the pathogenesis of the disease.
ISSN: 0143-4160
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory of Virology and Chemotherapy (Rega Institute)
Physiology Section (-)
Laboratory of Molecular and Cellular Signaling
× corresponding author
# (joint) last author

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