RT Journal Article T1 Complement as a diagnostic tool in immunopathology A1 López Lera, Alberto A1 Corvillo, Fernando A1 Nozal, Pilar A1 Regueiro González-Barros, José Ramón A1 Sánchez Corral, Pilar A1 López Trascasa, Margarita AB The complement system is a complex and autoregulated multistep cascade at the interface of innate and adaptive immunity. It is activated by immune complexes or apoptotic cells (classical pathway), pathogen-associated glycoproteins (lectin pathway) or a variety of molecular and cellular surfaces (alternative pathway). Upon activation, complement triggers the generation of proteolytic fragments that allow the elimination of the activating surface by enhancing inflammation, opsonization, phagocytosis, and cellular lysis. Moreover, complement efficiently discriminates self from non-self surfaces by means of soluble and membrane-bound complement regulators which are critical for innate self-tolerance. Complement deficiency or dysfunction disturb complement homeostasis and give rise to diseases as diverse as bacterial infections, autoimmunity, or renal and neurological disorders. Research on complement-targeted therapies is an expanding field that has already improved the prognosis of severe diseases such as atypical Haemolytic Uremic syndrome or Paroxysmal Nocturnal Haemoglobinuria. Therefore, complement analysis and monitoring provides valuable information with deep implications for diagnosis and therapy. In addition to its important role as an extracellular defense system, it has now become evident that complement is also present intracellularly, and its activation has profound implications for leukocyte survival and function. In this review, we summarize the essential, up-to-date information on the use of complement as a diagnostic and therapeutic tool in the clinics. PB Elsevier SN 1084-9521 YR 2018 FD 2018-06-12 LK https://hdl.handle.net/20.500.14352/106737 UL https://hdl.handle.net/20.500.14352/106737 LA eng NO López-Lera A, Corvillo F, Nozal P, Regueiro JR, Sánchez-Corral P, López-Trascasa M. Complement as a diagnostic tool in immunopathology. Semin Cell Dev Biol. 2019 Jan;85:86-97. doi: 10.1016/j.semcdb.2017.12.017. Epub 2018 Jan 12. PMID: 29292221. NO Instituto de Salud Carlos III NO Fondos FEDER NO CIBERER NO Fundación SENEFRO DS Docta Complutense RD 7 abr 2025