SOCS2 influences LPS induced human monocyte-derived dendritic cell maturation.
Dendritic cells (DCs) are highly specific antigen presenting cells, which link innate and adaptive immune responses and participate in protecting hosts from invading pathogens. DCs can be generated in vitro by culturing human monocytes with GM-CSF and IL-4 followed by LPS induced DC maturation. We set out to study the suppressor of cytokine signaling (SOCS) proteins during maturation and activation of human monocyte-derived DCs from peripheral blood in vitro. We found that the expression of SOCS2 mRNA and protein is dramatically up-regulated during DC maturation. Silencing of SOCS2 using siRNA, inhibited DC maturation as evidenced by a decreased expression of maturation markers such as CD83, co-stimulatory molecules CD40, CD86 and HLA-DR. Furthermore, silencing of SOCS2 decreased LPS induced activation of MAP kinases (SAKP/JNK, p38, ERK), IRF3, decreased the translocation of the NF-kappaB transcription factor and reduced downstream gene mRNA expression. These results suggest a role for SOCS2 in the MyD88-dependent and -independent TLR4 signaling pathways. In conclusion, our results demonstrate that SOCS2 is required for appropriate TLR4 signaling in maturating human DCs via both the MyD88-dependent and -independent signaling pathway.
Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden.
Jin
J
Hu
Ola
O
Winqvist
Amilcar
A
Flores-Morales
Ann-Charlotte
AC
Wikström
Gunnar
G
Norstedt
D015703:Antigens, CD / Q000096:biosynthesis; D051940:B7-2 Antigen / Q000096:biosynthesis; D019013:CD40 Antigens / Q000096:biosynthesis; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000166:cytology*; D020868:Gene Silencing; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000378:metabolism; D006684:HLA-DR Antigens / Q000378:metabolism; D006801:Humans; D007136:Immunoglobulins / Q000096:biosynthesis; D015847:Interleukin-4 / Q000378:metabolism; D008070:Lipopolysaccharides / Q000378:metabolism*; D008562:Membrane Glycoproteins / Q000096:biosynthesis; D009000:Monocytes / Q000166:cytology*; D053594:Myeloid Differentiation Factor 88 / Q000378:metabolism; D034741:RNA, Small Interfering / Q000378:metabolism; D050826:Suppressor of Cytokine Signaling Proteins / Q000378:metabolism* / Q000502:physiology*; D000097802:CD83 Antigen
D015703:Antigens, CD; D051940:B7-2 Antigen; D019013:CD40 Antigens; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D006684:HLA-DR Antigens; D007136:Immunoglobulins; D015847:Interleukin-4; D008070:Lipopolysaccharides; D008562:Membrane Glycoproteins; D053594:Myeloid Differentiation Factor 88; D034741:RNA, Small Interfering; D050826:Suppressor of Cytokine Signaling Proteins; D000097802:CD83 Antigen; C507779:MYD88 protein, human; C106643:SOCS2 protein, human