TY - JOUR
T1 - Glycosylation of the interleukin-1 receptor type I is required for optimal binding of interleukin-1
AU - Mancilla, J.
AU - Ikejima, T.
AU - Dinarello, C. A.
PY - 1992
Y1 - 1992
N2 - The two types of cell surface receptors for interleukin-1 (IL-1) are glycoproteins that contain N-glycosidic chains on their extracellular portions. To determine the role of glycosylation of the IL-1 receptor type I (IL-1RtI) in the binding and function of IL-1, we used four plant lectins and glycosidase treatment on two different T-cell lines (EL4-6.1 and D10S) and expressing high number of binding sites for IL-1. The lectins wheat germ agglutinin, phytohemagglutinin, and concanavalin A inhibited in a dose- response manner the IL-1-induced proliferation of D10S cells. Binding of IL-1 was blocked and radioactive IL-1 was displaced from these cells by these lectins. Specific sugars (GlcNAc, NeuAc, Gal-GlcNAc-Man, Man, or α-MeMan) did not themselves affect IL-1 binding but reversed the blocking effects of the lectins. The two cell lines differed in their responses to the lectin- mediated inhibition of IL-1 binding. Digestion by N-glycosidase significantly decreased the capacity of cells to bind IL-1, and reduced by ~20,000 D the M(r) of the IL-1RtI. Neuraminidase and O-glycanase treatment did not alter the binding of IL-1 to D10S or EL4-6.1 cells. This study demonstrates that glycosylation of the extracellular domain of the IL-1RtI is due to N-linked carbohydrates, that the degree of glycosylation can vary in cells of different lineage, and that this N-linked glycosylation appears to be essential for optimal binding and activity of IL-1 to its type I receptor.
AB - The two types of cell surface receptors for interleukin-1 (IL-1) are glycoproteins that contain N-glycosidic chains on their extracellular portions. To determine the role of glycosylation of the IL-1 receptor type I (IL-1RtI) in the binding and function of IL-1, we used four plant lectins and glycosidase treatment on two different T-cell lines (EL4-6.1 and D10S) and expressing high number of binding sites for IL-1. The lectins wheat germ agglutinin, phytohemagglutinin, and concanavalin A inhibited in a dose- response manner the IL-1-induced proliferation of D10S cells. Binding of IL-1 was blocked and radioactive IL-1 was displaced from these cells by these lectins. Specific sugars (GlcNAc, NeuAc, Gal-GlcNAc-Man, Man, or α-MeMan) did not themselves affect IL-1 binding but reversed the blocking effects of the lectins. The two cell lines differed in their responses to the lectin- mediated inhibition of IL-1 binding. Digestion by N-glycosidase significantly decreased the capacity of cells to bind IL-1, and reduced by ~20,000 D the M(r) of the IL-1RtI. Neuraminidase and O-glycanase treatment did not alter the binding of IL-1 to D10S or EL4-6.1 cells. This study demonstrates that glycosylation of the extracellular domain of the IL-1RtI is due to N-linked carbohydrates, that the degree of glycosylation can vary in cells of different lineage, and that this N-linked glycosylation appears to be essential for optimal binding and activity of IL-1 to its type I receptor.
UR - http://www.scopus.com/inward/record.url?scp=0026641183&partnerID=8YFLogxK
M3 - Artículo
SN - 1056-5477
VL - 11
SP - 197
EP - 205
JO - Lymphokine and Cytokine Research
JF - Lymphokine and Cytokine Research
IS - 4
ER -