Two-dimensional lectin affinity electrophoresis of alpha-fetoprotein: characterization of erythroagglutinating phytohemagglutinin-dependent microheterogeneity forms.
By means of two-dimensional lectin affinity electrophoresis of human alpha-fetoprotein (AFP) from different sources, AFP bands separated with erythroagglutinating phytohemagglutinin (E-PHA) were further characterized with other lectins of known oligosaccharide specificities. The results with a cord serum AFP revealed that not only AFP-P2 (E-PHA-nonreactive) but also AFP-P4 and P5 (E-PHA-reactive) had affinities for Concanavalin A (Con A) and Allomyrina dichotoma lectin (allo A), indicating that the cord serum AFP has nonbisected biantennary complex-type oligosaccharides with the terminal galactose on Man alpha 1----6 residue sialylated at the C-6, but not C-3, position. On the other hand, the results with a hepatoblastoma (HUH-6 C1-5 cell line) AFP showed that not only AFP-P5 but also AFP-P1 (E-PHA-nonreactive) and P3 (E-PHA-less reactive) had Con A-nonreactive AFP and that AFP-P1 had AFP-A1 (allo A-nonreactive) and AFP-A2 (allo A-less reactive), and AFP-P3 and P4 had AFP-A1s (allo A-nonreactive), as main components, in addition to the spots of cord serum AFP. Most of the E-PHA-dependent bands of AFP were further subdivided with Lens culinaris agglutinin (LCA-A) into LCA-A-reactive, weakly reactive and nonreactive spots. Similar results were obtained with AFP preparations from hepatocellular carcinomas and other malignancies, indicating that the bisected bi-(or tri- and tetra-) antennary sugar chains with the exposed terminal galactose of the Man alpha 1----6 arm as well as those with the C-3 sialylated galactose residues could be expressed in AFP upon malignant transformation.(ABSTRACT TRUNCATED AT 250 WORDS)
Taketa
K
K
Health Research Center, Kagawa University, Takamatsu, Japan.
Ichikawa
E
E
Sato
J
J
Taga
H
H
Hirai
H
H
D003208:Concanavalin A; D015180:Electrophoresis, Gel, Two-Dimensional / Q000379:methods*; D006801:Humans; D007536:Isomerism; D037102:Lectins; D010835:Phytohemagglutinins; D014407:Tumor Cells, Cultured; D000509:alpha-Fetoproteins / Q000032:analysis*
C045794:Allomyrina lectin; D037102:Lectins; D010835:Phytohemagglutinins; D000509:alpha-Fetoproteins; D003208:Concanavalin A