Abstract:
:The objective of this study is to investigate the role of Calmodulin-dependent protein kinase IV (CaMKIV) in Cardiotoxin (CTX)-induced mice muscle inflammation. CTX injection i.m. was performed to induce B6 mice acute tibialis anterior (TA) muscle injury. The mice were then injected i.p. with the recombinant CaMKIV protein or its antagonist KN-93. Immunoblotting was used to assess Calmodulin (CaM) and CaMKIV levels. Immunofluorescence was used to detect intramuscular infiltration or major histocompatibility complex (MHC)-I expression in damaged muscle. The extent of infiltration was evaluated by fluorescent intensity analysis. Cytokines/chemokines levels were determined by qPCR. CaMKIV gene knockdown in C2C12 cells was performed in order to evaluate the effects of CaMKIV on immuno-behavior of muscle cells. CTX administration induced a strong up-regulation of CaM and p-CaMKIV levels in infiltrated mononuclear cells and regenerated myofibers. In vivo adding of the recombinant CaMKIV protein enhanced intramuscular infiltration of monocytes/macrophages in damaged muscle and increased the number of proinflammatory Ly-6C+F4/80+ macrophage cells. CaMKIV protein treatment induced a striking up-regulation of mRNA levels of IL-1, IL-6, MCP-1, and MCP-3 in CD45+ cells sorted from damaged muscle; increased the infiltration of CD8+ T cells; and induced the up-regulation of MHC-I in partial regenerated myofibers, which was rarely observed in muscle damage alone. Additionally, CaMKIV protein treatment diminished the regulatory T cells (Tregs) number and led to the damaged TA muscle repair delay. In vitro CaMKIV gene knockdown reversed IFN-γ-induced up-regulation of MHC-I/II and TLR3 in the differentiated C2C12 myotubes. CaMKIV can act as an immunostimulation molecule and enhances the acute muscle inflammatory responses.
journal_name
Inflammationjournal_title
Inflammationauthors
Shi D,Gu R,Song Y,Ding M,Huang T,Guo M,Xiao J,Huang W,Liao Hdoi
10.1007/s10753-017-0678-2subject
Has Abstractpub_date
2018-02-01 00:00:00pages
199-212issue
1eissn
0360-3997issn
1573-2576pii
10.1007/s10753-017-0678-2journal_volume
41pub_type
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