Post by eleva

C3 glomerulopathy (C3G) is a rare kidney disease — but it offers fascinating insights into the complexity of complement biology. At the center of the disease process lies one critical regulator: → Factor H Under normal conditions, Factor H acts as a safeguard of the alternative complement pathway, preventing excessive complement activation and protecting healthy tissues from damage. In C3G, this protective function can be disrupted by: - Genetic variants affecting complement regulators - Autoantibodies that interfere with Factor H activity - Persistent overactivation of the complement cascade The consequences can be severe: → Continuous C3 activation → Complement deposition within the glomeruli → Progressive kidney injury → Declining renal function and, in some cases, kidney failure What makes C3G particularly interesting is that it illustrates a broader principle: Many complement-mediated diseases are not driven by excessive activation alone — but by the loss of regulatory balance. When key regulators such as Factor H fail to maintain control, physiological defense mechanisms can become drivers of tissue damage. Understanding these regulatory mechanisms may be essential for developing more targeted and physiologically relevant therapeutic strategies in complement-driven diseases. As our understanding of complement biology evolves, could restoring physiological regulation become the next frontier beyond complement inhibition? Reference: Smith RJH et al. Nature Reviews Nephrology (2019) #ComplementSystem #FactorH #ComplementBiology #Immunology #C3G