title: Defective solubilization of immune complexes and activation of the complement system in patients with pulmonary tuberculosis.
abstract: BACKGROUND
  Association between inherited deficiencies of the complement components and immune complex disease indicates the importance of the complement system in the handling of circulating immune complexes. High levels of circulating immune complexes are seen in pulmonary tuberculosis. This study is, therefore, aimed to look at the concentration of circulating immune complexes, the status of complement-mediated immune complex handling, and the extent of complement activation in untreated pulmonary tuberculosis compared to treated pulmonary tuberculosis patients and healthy controls.
  
  
  RESULTS
  High immune complex levels, decreased complement-mediated solubilization, and increased activation of the complement system were observed in untreated tuberculosis patients.
  
  
  CONCLUSIONS
  The results obtained from the present study suggest that complement mediated solubilization is less in patients with tuberculosis, and this defective solubilization is likely to take part in a vicious cycle involving immune complex deposition and complement activation and, thus, may lead to disease progression depending on the nature of the defect.
authors.affiliation: Department of Clinical Pathology, Tuberculosis Research Centre, Chetput, Chennai 600031, India.
authors.forename: P
authors.initials: P
authors.lastname: Senbagavalli
authors.forename: S T
authors.initials: ST
authors.lastname: Geetha
authors.forename: P
authors.initials: P
authors.lastname: Venkatesan
authors.forename: V D
authors.initials: VD
authors.lastname: Ramanathan
mesh_terms: D000328:Adult; D000936:Antigen-Antibody Complex / Q000096:biosynthesis* / Q000097:blood / Q000235:genetics; D015415:Biomarkers / Q000097:blood; D003167:Complement Activation / Q000235:genetics; D003176:Complement C3 / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D003181:Complement C4 / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D003602:Cytotoxicity, Immunologic; D005260:Female; D006801:Humans; D007105:Immune Complex Diseases / Q000151:congenital; D008297:Male; D008875:Middle Aged; D015166:Monitoring, Immunologic; D009169:Mycobacterium tuberculosis / Q000276:immunology* / Q000472:pathogenicity; D011379:Prognosis; D014397:Tuberculosis, Pulmonary / Q000097:blood / Q000175:diagnosis / Q000235:genetics / Q000276:immunology* / Q000503:physiopathology; D014774:Virulence
chemical_list: D000936:Antigen-Antibody Complex; D015415:Biomarkers; D003176:Complement C3; D003181:Complement C4