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RESEARCH PRODUCT

Modulation of C1q mRNA Expression and Secretion by Interleukin-1,Interleukin-6, and Interferon-g in Resident and Stimulated Murine Peritoneal Macrophages

Michael LoosDominik Faust

subject

ImmunologyGene Expressionchemical and pharmacologic phenomenaIn Vitro TechniquesProinflammatory cytokineInterferon-gammaMiceClassical complement pathwayImmune systemmedicineAnimalsImmunology and AllergyMacrophageInterferon gammaRNA MessengerInterleukin 6Macrophage inflammatory proteinMice Inbred BALB CbiologyInterleukin-6ChemistryComplement C1qInterleukinHematologyMacrophage ActivationRecombinant ProteinsCell biologyThioglycolatesMacrophages Peritonealbiology.proteinInterleukin-1medicine.drug

description

The complement system plays an important role in the humoral immune response. Activation of the classical complement pathway is mediated by its subcomponent, C1q. Among the main C1q-synthesising tissues, macrophages have been attributed as a source of particular importance. We investigated the effects of cytokines (IL-1, IL-6 and Interferon-gamma) on local C1q mRNA expression and C1q secretion in resident and in thioglycollate-stimulated murine peritoneal macrophages in vitro. The macrophages were isolated from murine peritoneal lavage fluid, maintained in culture and incubated with the cytokines. Among the cytokines, only IL-6 had a stimulatory effect on C1q production (25% increase vs. control), while IL-1 and interferon-gamma had an inhibitory effect (50% decrease vs. control), especially in stimulated peritoneal macrophages in culture. Our data suggest that C1q production in macrophages may be differentially regulated by inflammatory cytokines such as IL-1, IL-6 and interferon-gamma, the response being dependent on macrophage activation.

yearjournalcountryeditionlanguage
2002-11-20Immunobiology
https://doi.org/10.1078/0171-2985-00187