In vitro initial immune response against Leishmania amazonensis infection is characterized by an increased production of IL-10 and IL-13

Brazilian Journal of Infectious Diseases

Zirlane Castelo B Coêlho¹  Maria Jania Teixeira¹  Erika Freitas Mota¹  Mércia Sindeaux Frutuoso¹  João Santana Da Silva¹  Aldina Barral¹  Manoel Barral-netto¹  Margarida Maria L Pompeu¹ 

关键词: Leishmania amazonensis;    interleukin-10;    interleukin-13;   

DOI  :  10.1590/S1413-86702010000500009

来源: SciELO

【 摘 要 】

The initial encounter of Leishmania with its host's immune system is important in the outcome of infection. Previous studies have shown that PBMCs from healthy volunteers (HV) exposed to Leishmania differ in IFN-γ production. We have expanded such observations evaluating the profile and kinetics of cytokines (IFN-γ, IL-12p70, IL-10, IL-13), chemokines (CCL5, CCL3, CCL4, CXCL10), and chemokine receptors (CCR1,CCR5, CXCR3, CCR4) in vitro L. amazonensis-stimulated of HV's PBMCs. HVs were divided in groups of high (HR) or low (LR) IFN-γ responders. In both groups, HR and LR, after L. amazonensis infection there was a predominance of IL-10 and IL-13 over IFN-γ production, while IL-12 was produced in similar amount. Regarding chemokines, a more striking difference was observed for CCL3 expression that was lower at 12 hours and 48 hours post infection in LR than in HR. Interestingly, a downregulation of CCR5 and a greater expression of CCR4 were found in low IFN-γ responders. These data suggest that early after L. amazonensis infection there is a cytokine milieu dominated by IL-13 and IL-10, and despite of this environment, IFN-γ is produced, supporting the complexity of the response. It is noteworthy that the pattern of immune response is mounted in first hours after Leishmania stimulation, with the definition of the differentiation of Th1 versus Th2 cells. It remains to be determined if such an in vitro difference has an in vivo counterpart in terms of susceptibility to infection

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