ISSN 1671-5411 CN 11-5329/R
Xuyang Feng, Haokao Gao, Zheng He, Haichang Wang, Ruifen Xu, Yan Gao. Natural anti-oxLDL IgM monoclonal antibody in the pathogenesis of atherosclerosis. J Geriatr Cardiol 2009; 6(1): 42-48.
Citation: Xuyang Feng, Haokao Gao, Zheng He, Haichang Wang, Ruifen Xu, Yan Gao. Natural anti-oxLDL IgM monoclonal antibody in the pathogenesis of atherosclerosis. J Geriatr Cardiol 2009; 6(1): 42-48.

Natural anti-oxLDL IgM monoclonal antibody in the pathogenesis of atherosclerosis

  • Publish Date: 2009-03-28
  • Objective To explore the role and the possible molecular mechanisms of natural anti-oxLDL IgM monoclonal antibody played and involved in pathogenesis of atherosclerosis. Methods Natural anti-oxLDL IgM monoclonal antibody 3A6 was generated by using standard hybridoma production techniques. Influence of 3A6 on formation of foam cells was observed by Oil Red O staining and affinity of Na125 I-conjugated oxLDL on the na?ve and LPS-activated macrophages. After LPS stimulation on macrophages, anti-TLR4 neutralizing mAb, p38MAPK specific inhibitor SB203580, NF-kB specific inhibitor PDTC or RNAi targeting Fcα/μ receptor (Fcamr) were applied, respectively. Results Natural anti-oxLDL IgM monoclonal antibody 3A6 were found specifically inhibit the binding of CuoxLDL to na?ve macrophages but not the binding of CuoxLDL to LPS-activated macrophages. It also promoted the formation of CuoxLDL-mediated foam macrophages. 3A6 F(ab’)2 or pre-incubation with un-related IgM inhibited the binding of 3A6/CuoxLDL complex to LPS-activated macrophages. LPS up-regulated the expression of Fcamr in macrophages in a dose- and time-dependent manner, which was attenuated by treatment with anti-TLR4. LPS induced the phosphorylation of p38MAPK and translocation of NF-κB p65, contributing to the up-regulated expression of Fcα/μ receptor in macrophages. Conclusions Natural anti-oxLDL IgM monoclonal antibody 3A6 specifically inhibited the binding of CuoxLDL to na?ve macrophages in vitro. However, LPS, through the Toll-like receptor (TLR)4 receptor, activated the p38MAPK and NF-κB pathways and up-regulated the expression of Fcα/μ receptor in macrophages, which promoted the binding of 3A6/CuoxLDL complex to macrophages through binding with Fc fragments and the formation of foam macrophages. Therefore, our findings provide a new explanation why bacterial infection deteriorates the pathogenesis of atherosclerosis.
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