Kawata J, Yamaguchi R, Yamamoto T, Ishimaru Y, Sakamoto A, Aoki M, Kitano M, Umehashi M, Hirose E, Yamaguchi Y. Human Neutrophil Elastase Induce Interleukin-10 Expression in Peripheral Blood Mononuclear Cells through Protein Kinase C Theta/Delta and Phospholipase Pathways.
CELL JOURNAL 2016;
17:692-700. [PMID:
26862528 PMCID:
PMC4746419 DOI:
10.22074/cellj.2016.3841]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Accepted: 03/15/2015] [Indexed: 01/30/2023]
Abstract
Objective
Neutrophils have an important role in the rapid innate immune response,
and the release or active secretion of elastase from neutrophils is linked to various
inflammatory responses. Purpose of this study was to determine how the human
neutrophil elastase affects the interleukin-10 (IL-10) response in peripheral blood
mononuclear cells (PBMC).
Materials and Methods
In this prospective study, changes in IL-10 messenger RNA
(mRNA) and protein expression levels in monocytes derived from human PBMCs
were investigated after stimulation with human neutrophil elastase (HNE). A set of
inhibitors was used for examining the pathways for IL-10 production induced by HNE.
Results
Reverse transcription polymerase chain reaction (RT-PCR) showed that
stimulation with HNE upregulated IL-10 mRNA expression by monocytes, while the
enzyme-linked immunosorbent assay (ELISA) revealed an increase of IL-10 protein
level in the culture medium. A phospholipase C inhibitor (U73122) partially blunt-
ed the induction of IL-10 mRNA expression by HNE, while IL-10 mRNA expression
was significantly reduced by a protein kinase C (PKC) inhibitor (Rottlerin). A calcium
chelator (3,4,5-trimethoxybenzoic acid 8-(diethylamino)octyl ester: TMB-8) inhibited
the response of IL-10 mRNA to stimulation by HNE. In addition, pretreatment with
a broad-spectrum PKC inhibitor (Ro-318425) partly blocked the response to HNE.
Finally, an inhibitor of PKC theta/delta abolished the increased level of IL-10 mRNA
expression.
Conclusion
These results indicate that HNE mainly upregulates IL-10 mRNA ex-
pression and protein production in moncytes via a novel PKC theta/delta, although
partially via the conventional PKC pathway.
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