Strong induction of ICAM-1 in human T cells transformed by human T-cell-leukemia virus type 1 and depression of ICAM-1 or LFA-1 in adult T-cell-leukemia-derived cell lines.
Sixteen human T-cell lines were studied for the expression of a cell-adhesion molecule ICAM-1 and its counter-receptor LFA-1. The cell lines included 3 human T-cell-leukemia-virus-type-I (HTLV-1)-negative cell lines derived from acute lymphoblastic leukemia (ALL) and 13 HTLV-1-positive cell lines, 7 of them established from cord- or peripheral-blood T cells by in vitro transformation with HTLV-1, 2 derived from HTLV-1 carriers, and 4 derived from patients with adult T-cell leukemia (ATL). In sharp contrast to a basal level of ICAM-1 in 3 HTLV-1-negative ALL cell lines, strong induction of ICAM-1 was seen in all HTLV-1-positive T-cell lines except for MT-1, one of the 4 ATL cell lines used in the present study. On the other hand, the expression of LFA-1 (CD11a and CD18) was more or less similar among the cell lines with and without HTLV-1. Interestingly, however, 3 out of 4 ATL cell lines (TL-Om1, H582, HUT102) revealed striking depression of LFA-1 expression. Several lines of evidence strongly argued against direct involvement of the viral transactivator p40tax or some autocrine cytokines in the induction of ICAM-1 in HTLV-1-positive T-cell lines. It was also found that ICAM-1 and LFA-1 were involved in syncytium formation induced in the co-culture of HTLV-1-positive and HTLV-1-negative human T-cell lines. Implications of constitutive expression of ICAM-1 for certain clinical manifestations of ATL and of depression of either ICAM-1 or LFA-1 during progression of ATL are discussed.
Shionogi Institute for Medical Science, Osaka, Japan.
K
K
Fukudome
M
M
Furuse
N
N
Fukuhara
S
S
Orita
T
T
Imai
S
S
Takagi
M
M
Nagira
Y
Y
Hinuma
O
O
Yoshie
D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D001483:Base Sequence; D015152:Blotting, Northern; D015815:Cell Adhesion Molecules / Q000096:biosynthesis* / Q000235:genetics; D002472:Cell Transformation, Viral; D016207:Cytokines / Q000502:physiology; D005434:Flow Cytometry; D016356:Gene Products, tax / Q000502:physiology; D015368:Human T-lymphotropic virus 1 / Q000472:pathogenicity*; D006801:Humans; D018799:Intercellular Adhesion Molecule-1; D015458:Leukemia, T-Cell / Q000378:metabolism* / Q000473:pathology; D016169:Lymphocyte Function-Associated Antigen-1 / Q000032:analysis*; D051379:Mice; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000032:analysis; D013601:T-Lymphocytes / Q000378:metabolism*; D014407:Tumor Cells, Cultured
D000911:Antibodies, Monoclonal; D015815:Cell Adhesion Molecules; D016207:Cytokines; D016356:Gene Products, tax; D016169:Lymphocyte Function-Associated Antigen-1; D012333:RNA, Messenger; D018799:Intercellular Adhesion Molecule-1