Binding of galectin-1 (gal-1) to the Thomsen-Friedenreich (TF) antigen on trophoblast cells and inhibition of proliferation of trophoblast tumor cells in vitro by gal-1 or an anti-TF antibody.
Galectin-1 (gal-1), a member of the mammalian beta-galactoside-binding proteins, recognizes preferentially Galbeta1-4GlcNAc sequences of several cell surface oligosaccharides. We demonstrate histochemically that the lectin recognizes appropriate glycotopes on the syncytiotrophoblast and extravillous trophoblast layer from second trimester human placenta and on BeWo chorion carcinoma cells. Gal-1 binding to BeWo cells was diminished by the Thomsen-Friedreich (TF)-disaccharide (Galbeta1-3GalNAc-) conjugated to polyacrylamide (TF-PAA). Gal-1 also inhibited BeWo cell proliferation in a concentration-dependent manner. Similar antiproliferative effects were also observed with an anti-TF monoclonal antibody (mAb, A78-G/A7). Therefore, we conclude that ligation of Galbeta1-4GlcNAc and Galbeta1-3GalNAc epitopes on BeWo cells may have regulatory effects on cell proliferation.
Jeschke
Udo
U
First Department of Obstetrics and Gynaecology, Ludwig Maximilians University of Munich, Maistrasse 11, 80337, Munich, Germany. udo.jeschke@med.uni-muenchen.de
Karsten
Uwe
U
Wiest
Irmi
I
Schulze
Sandra
S
Kuhn
Christina
C
Friese
Klaus
K
Walzel
Hermann
H
D000906:Antibodies / Q000494:pharmacology; D015295:Antigens, Tumor-Associated, Carbohydrate / Q000378:metabolism*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects*; D005260:Female; D037483:Galectin 1 / Q000378:metabolism* / Q000494:pharmacology*; D006021:Glycophorins / Q000276:immunology; D006801:Humans; D007075:Immunoglobulin M / Q000494:pharmacology; D014328:Trophoblastic Neoplasms / Q000378:metabolism*; D014327:Trophoblasts / Q000187:drug effects* / Q000378:metabolism
D000906:Antibodies; D015295:Antigens, Tumor-Associated, Carbohydrate; D037483:Galectin 1; D006021:Glycophorins; D007075:Immunoglobulin M; C016467:Thomsen-Friedenreich antigen; C025991:Thomsen-Friedenreich antibodies