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Decay-Accelerating Factor Differentially Associates With Complement-Mediated Damage in Synovium After Meniscus Tear As Compared to Anterior Cruciate Ligament Injury

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Journal Immune Netw
Date 2024 May 10
PMID 38725672
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Abstract

We have reported that anterior cruciate ligament (ACL) injury leads to the differential dysregulation of the complement system in the synovium as compared to meniscus tear (MT) and proposed this as a mechanism for a greater post-injury prevalence of post traumatic osteoarthritis (PTOA). To explore additional roles of complement proteins and regulators, we determined the presence of decay-accelerating factor (DAF), C5b, and membrane attack complexes (MACs, C5b-9) in discarded surgical synovial tissue (DSST) collected during arthroscopic ACL reconstructive surgery, MT-related meniscectomy, osteoarthritis (OA)-related knee replacement surgery and normal controls. Multiplexed immunohistochemistry was used to detect and quantify complement proteins. To explore the involvement of body mass index (BMI), after these 2 injuries, we examined correlations among DAF, C5b, MAC and BMI. Using these approaches, we found that synovial cells after ACL injury expressed a significantly lower level of DAF as compared to MT (p<0.049). In contrast, C5b staining synovial cells were significantly higher after ACL injury (p<0.0009) and in OA DSST (p<0.039) compared to MT. Interestingly, there were significantly positive correlations between DAF & C5b (r=0.75, p<0.018) and DAF & C5b (r=0.64 p<0.022) after ACL injury and MT, respectively. The data support that DAF, which should normally dampen C5b deposition due to its regulatory activities on C3/C5 convertases, does not appear to exhibit that function in inflamed synovia following either ACL injury or MT. Ineffective DAF regulation may be an additional mechanism by which relatively uncontrolled complement activation damages tissue in these injury states.

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References
1.
Nicholson-Weller A, Burge J, Austen K . Purification from guinea pig erythrocyte stroma of a decay-accelerating factor for the classical c3 convertase, C4b,2a. J Immunol. 1981; 127(5):2035-9. View

2.
Egan E, Jiang R, Moechtar M, Barteneva N, Weekes M, Nobre L . Malaria. A forward genetic screen identifies erythrocyte CD55 as essential for Plasmodium falciparum invasion. Science. 2015; 348(6235):711-4. PMC: 4465434. DOI: 10.1126/science.aaa3526. View

3.
Holers V, Frank R, Clauw A, Seifert J, Zuscik M, Asokan S . Potential causal role of synovial complement system activation in the development of post-traumatic osteoarthritis after anterior cruciate ligament injury or meniscus tear. Front Immunol. 2023; 14:1146563. PMC: 10189880. DOI: 10.3389/fimmu.2023.1146563. View

4.
Li Q, Huang D, Nacion K, Bu H, Lin F . Augmenting DAF levels in vivo ameliorates experimental autoimmune encephalomyelitis. Mol Immunol. 2009; 46(15):2885-91. PMC: 2753188. DOI: 10.1016/j.molimm.2009.07.003. View

5.
Fridkis-Hareli M, Storek M, Or E, Altman R, Katti S, Sun F . The human complement receptor type 2 (CR2)/CR1 fusion protein TT32, a novel targeted inhibitor of the classical and alternative pathway C3 convertases, prevents arthritis in active immunization and passive transfer mouse models. Mol Immunol. 2018; 105:150-164. PMC: 6331245. DOI: 10.1016/j.molimm.2018.09.013. View