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Idiotypic determinants of monoclonal antibodies that bind to 3-fucosyllactosamine.

M Umeda, I Diego, E D Ball and D M Marcus
J Immunol April 1, 1986, 136 (7) 2562-2567;
M Umeda
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I Diego
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E D Ball
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D M Marcus
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Abstract

Many monoclonal antibodies that react with the lacto-N-fucopentaose III (LNF III) antigenic determinant, Gal beta 1-4(Fuc alpha 1-3)GlcNAc beta 1-3Gal beta 1-4Glc, have been described recently. The terminal trisaccharide of this determinant, fucosyllactosamine, is present on glycolipids and glycoproteins and on the surface of granulocytes, monocytes, and other cells. To study the structural and genetic diversity of these antibodies, syngeneic anti-idiotypic monoclonal antibodies were produced in BALB/c mice against PMN 6, a monoclonal antibody directed against this sequence. Anti-idiotypic antibodies 6B1 and 6C4 reacted with 50% of a panel of 20 anti-LNF III monoclonal antibodies, whereas 6A3 reacted strongly only with PMN 6. This indicates that the determinants recognized by 6C4 and 6B1 represent major cross-reactive idiotopes of this family of antibodies. The binding of idiotypic antibodies to a glycolipid bearing this antigenic determinant was completely inhibited by the three anti-idiotypic antibodies, 6A3, 6B1, and 6C4. The idiotopes could be demonstrated on the heavy chain of the monoclonal antibodies by an antibody transfer technique when mild reducing conditions were employed, but a high concentration of reducing agent destroyed the idiotypic determinants. This suggests that the anti-idiotypic antibodies recognize conformational structures expressed on the heavy chain molecules. The binding of 18 monoclonal antibodies to two glycolipid antigens and to a fucosyllactosamine-bovine serum albumin conjugate was compared. Antibodies that possessed the 6C4 cross-reactive idiotope bound to fucosyllactosamine-bovine serum albumin more weakly than idiotype-negative antibodies (p = 0.001). This suggests that the 6C4-positive antibodies might represent germline structures.

  • Copyright © 1986 by American Association of Immunologists

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The Journal of Immunology
Vol. 136, Issue 7
1 Apr 1986
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Idiotypic determinants of monoclonal antibodies that bind to 3-fucosyllactosamine.
M Umeda, I Diego, E D Ball, D M Marcus
The Journal of Immunology April 1, 1986, 136 (7) 2562-2567;

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Idiotypic determinants of monoclonal antibodies that bind to 3-fucosyllactosamine.
M Umeda, I Diego, E D Ball, D M Marcus
The Journal of Immunology April 1, 1986, 136 (7) 2562-2567;
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Print ISSN 0022-1767        Online ISSN 1550-6606