Increase of peripheral B lymphocytes committed to the production of monoreactive and high affinity antibodies to HTLV-1 in patients with HAM/TSP.
We quantitated the frequency of B lymphocytes capable of producing antibodies to HTLV-1 in the peripheral blood from patients with HAM/TSP, non-HAM/TSP HTLV-1 carriers and seronegative healthy subjects. Epstein-Barr virus (EBV) was used as a polyclonal activator of B lymphocytes in a limiting dilution condition. We found that B lymphocytes committed to the production of monoreactive-IgG and -IgA antibodies to recombinant HTLV-1 (gag + env) hybrid protein were significantly increased in a number in patients with HAM/TSP as compared to non-HAM/TSP HTLV-1 carriers and seronegative healthy subjects. By transforming these B lymphocytes with EBV and fusing them with human-mouse heteromyeloma (F3B6), a stable hybridoma producing IgG monoclonal antibody (mAb) to HTLV-1 (gag + env) protein was generated from a patient with HAM/TSP. This mAb (IgG1, kappa), designated F31.1, specifically bound to the amino acid residues from 235 to 254 of HTLV-1 envelope glycoproteins (gp46) with high affinity (Kd = 4.0 x 10(-9) mol/l). These data indicate that the antigen-driven process of B lymphocytes maturation by HTLV-1 antigens is markedly increased in patients with HAM/TSP.
First Department of Internal Medicine, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
M
M
Nakamura
Y
Y
Itoyama
M
M
Kuroki
S
S
Nakano
S
S
Kondoh
S
S
Nagafuchi
J
J
Kira
I
I
Ichinose
K
K
Mitsugi
K
K
Anzai
D000915:Antibody Affinity; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology*; D000939:Epitopes; D015481:HTLV-I Antibodies / Q000276:immunology*; D015486:HTLV-I Antigens / Q000032:analysis; D006801:Humans; D015493:Paraparesis, Tropical Spastic / Q000276:immunology*
D000939:Epitopes; D015481:HTLV-I Antibodies; D015486:HTLV-I Antigens