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2016 ; 13
(ä): 52
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Actin- and clathrin-dependent mechanisms regulate interferon gamma release after
stimulation of human immune cells with respiratory syncytial virus
#MMPMID27004689
Jans J
; elMoussaoui H
; de Groot R
; de Jonge MI
; Ferwerda G
Virol J
2016[Mar]; 13
(ä): 52
PMID27004689
show ga
BACKGROUND: Respiratory syncytial virus (RSV) can cause recurrent and severe
respiratory tract infections. Cytoskeletal proteins are often involved during
viral infections, either for cell entry or the initiation of the immune response.
The importance of actin and clathrin dynamics for cell entry and the initiation
of the cellular immune response against RSV in human immune cells is not known
yet. The aim of this study was to investigate the role of actin and clathrin on
cell entry of RSV and the subsequent effect on T cell activation and interferon
gamma release in human immune cells. METHODS: Peripheral blood mononuclear cells
and purified monocytes were isolated from healthy adults and stimulated in vitro
with RSV. Actin and clathrin dynamics were inhibited with respectively
cytochalasin D and chlorpromazine. T cell receptor signaling was inhibited with
cyclosporin A. Flow cytometry was used to determine the role of actin and
clathrin on cell entry and T cell activation by RSV. Enzyme-linked immunosorbent
assays were used to investigate the contribution of actin and clathrin on the
release of interferon gamma. RESULTS: Cell entry, virus gene transcription and
interferon gamma release are actin-dependent. Post-endocytic processes like the
increased expression of major histocompatibility complex II on monocytes , T cell
activation and the release of interferon gamma are clathrin-dependent. Finally, T
cell receptor signaling affects T cell activation, whereas soluble interleukin 18
is dispensable. CONCLUSION: Analysis of cell entry and interferon gamma release
after infection with RSV reveals the importance of actin- and clathrin-dependent
signaling in human immune cells. Insights into the cellular biology of the human
immune response against respiratory syncytial virus will provide a better
understanding of disease pathogenesis and may prove useful in the development of
preventive strategies.