Complement dysregulation in glomerulonephritis.

Area of Science:

• Nephrology
• Immunology
• Renal Pathology

Background:

• Glomerulonephritis (GN) encompasses renal diseases damaging glomeruli via immune mechanisms.
• Complement system dysregulation is a major driver in many GN manifestations, stemming from genetic factors, autoimmunity, infections, or abnormal immunoglobulins.
• The alternative pathway of complement activation is frequently implicated in GN pathogenesis.

Purpose of the Study:

• To review complement system dysfunction mechanisms in primary GN.
• To differentiate GN from atypical hemolytic uremic syndrome.
• To outline etiology-directed therapy and prognosis for common GN types.

Main Methods:

• Review of scientific literature on complement pathways and GN.
• Analysis of diagnostic cornerstones: renal biopsy and complement assessment.
• Discussion of clinical features, therapeutic principles, and emerging treatments.

Main Results:

• Complement overactivation or misdirection is a common link in diverse GN forms, including IgA GN, dense deposit disease, C3 GN, post-infectious GN, and membranous GN.
• Clinical features alone are insufficient for differential diagnosis of GN.
• Management involves controlling hypertension, reducing proteinuria, and sometimes immunomodulatory or complement-inhibiting therapies.

Conclusions:

• Understanding complement dysfunction is crucial for diagnosing and managing glomerulonephritis.
• Personalized, etiology-directed therapy and careful follow-up are essential for optimal patient outcomes.
• Complement inhibition represents a promising therapeutic avenue for GN.