Patricia López1, Javier Rodríguez-Carrio2, Ana Suárez3. 1. Department of Functional Biology, Immunology Area, Faculty of Medicine, University of Oviedo, Oviedo, Spain. Electronic address: lopezpatricia@uniovi.es. 2. Department of Functional Biology, Immunology Area, Faculty of Medicine, University of Oviedo, Oviedo, Spain. Electronic address: rodriguezcjavier@uniovi.es. 3. Department of Functional Biology, Immunology Area, Faculty of Medicine, University of Oviedo, Oviedo, Spain. Electronic address: anasua@uniovi.es.
Abstract
OBJECTIVES: To analyse the influence of IFNα on TNFα production by human peripheral blood mononuclear cells (PBMCs), as well as the possible interference of this cytokine on the effect of antimalarial drugs, TNFα regulators widely used in the treatment of systemic lupus erythematosus (SLE). METHODS: PBMCs, monocytes or T cells were treated with IFNα alone or simultaneously to cellular stimuli as well as in the presence or absence of chloroquine. Supernatants from such cultures were collected to quantify TNFα by ELISA. TNFα and STAT4 expression in cultured cells were analysed by intracellular flow cytometry. In addition, STAT4 gene expression and serum levels of TNFα and IFNα were quantified in 53 SLE patients and 45 controls. RESULTS: IFNα alone did not modify significantly TNFα production, but an increase was observed in stimulated PBMC. Further analyses showed that monocytes were the cellular population responsible for this effect. In addition, IFNα treatment increased STAT4 in stimulated monocytes, suggesting that TNFα upregulation could be mediated by STAT4. On the other hand, the analysis of the antimalarial effect showed that chloroquine was able to inhibit in vitro the expression of TNFα and STAT4 enhanced by IFNα. In antimalarial-treated SLE patients, however, only those with high IFNα serum levels presented lower expression of STAT4. CONCLUSIONS: IFNα treatment enhances the induction of TNFα and STAT4 in stimulated monocytes, an effect inhibited in vitro by chloroquine treatment. However, the consequence of antimalarial treatment on SLE patients could be different depending on their IFNα serum levels.
OBJECTIVES: To analyse the influence of IFNα on TNFα production by human peripheral blood mononuclear cells (PBMCs), as well as the possible interference of this cytokine on the effect of antimalarial drugs, TNFα regulators widely used in the treatment of systemic lupus erythematosus (SLE). METHODS: PBMCs, monocytes or T cells were treated with IFNα alone or simultaneously to cellular stimuli as well as in the presence or absence of chloroquine. Supernatants from such cultures were collected to quantify TNFα by ELISA. TNFα and STAT4 expression in cultured cells were analysed by intracellular flow cytometry. In addition, STAT4 gene expression and serum levels of TNFα and IFNα were quantified in 53 SLEpatients and 45 controls. RESULTS: IFNα alone did not modify significantly TNFα production, but an increase was observed in stimulated PBMC. Further analyses showed that monocytes were the cellular population responsible for this effect. In addition, IFNα treatment increased STAT4 in stimulated monocytes, suggesting that TNFα upregulation could be mediated by STAT4. On the other hand, the analysis of the antimalarial effect showed that chloroquine was able to inhibit in vitro the expression of TNFα and STAT4 enhanced by IFNα. In antimalarial-treated SLEpatients, however, only those with high IFNα serum levels presented lower expression of STAT4. CONCLUSIONS: IFNα treatment enhances the induction of TNFα and STAT4 in stimulated monocytes, an effect inhibited in vitro by chloroquine treatment. However, the consequence of antimalarial treatment on SLEpatients could be different depending on their IFNα serum levels.
Authors: Juan M Mejia-Vilet; Samir V Parikh; Huijuan Song; Paolo Fadda; John P Shapiro; Isabelle Ayoub; Lianbo Yu; Jianying Zhang; Norma Uribe-Uribe; Brad H Rovin Journal: Nephrol Dial Transplant Date: 2019-07-01 Impact factor: 5.992
Authors: Petrus Linge; Paul R Fortin; Christian Lood; Anders A Bengtsson; Eric Boilard Journal: Nat Rev Rheumatol Date: 2018-03-21 Impact factor: 20.543