Complement C4d ELISA Kit

Complement C4d ELISA Kit

Complement C4d is a degradation product of the complement protein C4 that becomes covalently bound to tissues or cell surfaces following activation of the classical or lectin complement pathways. Because C4d remains associated with sites of complement activation, it serves as a useful biomarker for assessing complement activity and deposition. Unlike circulating C4 levels, which can fluctuate and may not directly reflect local complement activation, C4d can provide insight into complement activity at specific tissue or cellular sites.

In research settings, C4d is widely used to study complement-mediated tissue injury and inflammatory processes. Its deposition can be assessed in experimental models of autoimmune disease, transplant rejection, and infectious pathology to investigate mechanisms of complement activation and immune complex–mediated tissue damage. C4d detection can help researchers characterize local complement activity, monitor changes in experimental disease models, and evaluate the effects of complement-targeted therapies in preclinical studies.

In clinical settings, C4d is particularly important in transplantation research and medicine as a biomarker associated with antibody-mediated rejection (AMR). Detection of C4d in biopsy samples from transplanted organs, such as kidney or heart, can indicate complement activation associated with donor-specific antibodies and may contribute to clinical assessment of graft injury. C4d has also been investigated as a biomarker in autoimmune diseases such as systemic lupus erythematosus, where complement activation and immune complex formation contribute to tissue injury.

This Complement C4d ELISA Kit is manufactured in Sweden by Svar Life Sciences.