Abstract
Objective
The aim of the study was to investigate the role of src-suppressed C kinase substrate (SSeCKS) in the modulation of rat pulmonary microvascular endothelial cells (RPMVEC) permeability elicited by interleukin (IL)-1β and tumor necrosis factor (TNF)-α.
Methods
The gene expression of SSeCKS was analyzed by reverse transcription-polymerase chain reaction. Immunoblotting was used to determine the SSeCKS protein expression and the activation of the protein kinase C (PKC) signaling pathway. A RPMVEC monolayer was constructed to determine changes of transendothelial electrical resistance (TER) and FITC-dextran flux (P d) across the monolayer. SSeCKS-specific small interfering RNA was transfected into RPMVEC.
Results
IL-1β and TNF-α activated the PKC signaling pathway in RPMVEC, and up-regulated the gene and protein expression of SSeCKS. Depletion of endogenous SSeCKS in RPMVEC significantly attenuated cytokine-induced decrease in TER and increase in P d, but not to the basal levels. PKC inhibitors also significantly decreased cytokine-induced hyperpermeability and SSeCKS expression.
Conclusions
SSeCKS is involved in the endothelial hyperpermeability induced by IL-1β and TNF-α in inflammatory process.







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Acknowledgments
This work was supported by a grant from the National Natural Science Foundation of China (No. 30670935). The authors thank Pro. Yuan Wang (Laboratory of Molecular Biology, Key Laboratory of Gene Resource Utilization for Genetic Diseases of Ministry of Education and Anhui Province) for helpful suggestions and technical support.
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Responsible Editor: Makoto Katori.
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You, QH., Sun, GY., Wang, N. et al. Role of src-suppressed C kinase substrate in rat pulmonary microvascular endothelial hyperpermeability stimulated by inflammatory cytokines. Inflamm. Res. 59, 949–958 (2010). https://doi.org/10.1007/s00011-010-0207-3
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DOI: https://doi.org/10.1007/s00011-010-0207-3


