Selective loss of pertussis toxin-sensitive G-proteins from the plasma membrane after antibody-induced internalization of T-cell surface molecules
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Selective loss of pertussis toxin-sensitive G-proteins from the plasma membrane after antibody-induced internalization of T-cell surface molecules. / Gerardy-Schahn, R; Mittrücker, H W; Schultze, U; Fleischer, B.
In: J BIOL CHEM, Vol. 266, No. 11, 15.04.1991, p. 6942-7.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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T1 - Selective loss of pertussis toxin-sensitive G-proteins from the plasma membrane after antibody-induced internalization of T-cell surface molecules
AU - Gerardy-Schahn, R
AU - Mittrücker, H W
AU - Schultze, U
AU - Fleischer, B
PY - 1991/4/15
Y1 - 1991/4/15
N2 - Antibody-induced antigenic modulation occurs after binding of antibodies to a variety of cell surface proteins. It is characterized by aggregation and subsequent loss of the molecules from the cell surface, usually by internalization. In this study we have investigated the effect of modulation of the T-cell antigen receptor complex (TCR) and the transferrin receptor (TFR) on the distribution of cholera toxin (CTx)- and pertussis toxin (PTx)-sensitive GTP binding proteins in human T-lymphocytes. Modulation of both the TCR and the TFR induced a selective shift of PTx-sensitive G-proteins from the plasma membrane to a high density membrane fraction enriched for lysosomal membranes. The distribution of CTx-sensitive G-proteins was unaffected. This shift was found in both the T-cell leukemia line Jurkat and in normal T-cells. The loss of PTx-sensitive G-proteins from the plasma membrane required approximately 15 h to be complete and was not inhibited by cycloheximide. It had no influence on T-cell triggering via anti-T-cell receptor antibodies and is unrelated to the inactivating effect of TCR-modulation on T-cell signalling. The loss of PTx-sensitive G-proteins was not accompanied by greater sensitivity to stimuli raising cAMP concentration. These results show that PTx-sensitive G-proteins can be selectively depleted from the plasma membrane by antibody treatment of T-cells.
AB - Antibody-induced antigenic modulation occurs after binding of antibodies to a variety of cell surface proteins. It is characterized by aggregation and subsequent loss of the molecules from the cell surface, usually by internalization. In this study we have investigated the effect of modulation of the T-cell antigen receptor complex (TCR) and the transferrin receptor (TFR) on the distribution of cholera toxin (CTx)- and pertussis toxin (PTx)-sensitive GTP binding proteins in human T-lymphocytes. Modulation of both the TCR and the TFR induced a selective shift of PTx-sensitive G-proteins from the plasma membrane to a high density membrane fraction enriched for lysosomal membranes. The distribution of CTx-sensitive G-proteins was unaffected. This shift was found in both the T-cell leukemia line Jurkat and in normal T-cells. The loss of PTx-sensitive G-proteins from the plasma membrane required approximately 15 h to be complete and was not inhibited by cycloheximide. It had no influence on T-cell triggering via anti-T-cell receptor antibodies and is unrelated to the inactivating effect of TCR-modulation on T-cell signalling. The loss of PTx-sensitive G-proteins was not accompanied by greater sensitivity to stimuli raising cAMP concentration. These results show that PTx-sensitive G-proteins can be selectively depleted from the plasma membrane by antibody treatment of T-cells.
KW - Adenosine Diphosphate Ribose
KW - Antibodies, Monoclonal
KW - Antigens, CD
KW - Antigens, CD3
KW - Antigens, Differentiation, T-Lymphocyte
KW - Calcium
KW - Cell Fractionation
KW - Cell Line
KW - Cell Membrane
KW - Centrifugation, Density Gradient
KW - Cytosol
KW - Exocytosis
KW - GTP-Binding Proteins
KW - Guanosine 5'-O-(3-Thiotriphosphate)
KW - Humans
KW - Kinetics
KW - NAD
KW - Pertussis Toxin
KW - Receptors, Antigen, T-Cell
KW - T-Lymphocytes, Cytotoxic
KW - Virulence Factors, Bordetella
M3 - SCORING: Journal article
C2 - 1826680
VL - 266
SP - 6942
EP - 6947
JO - J BIOL CHEM
JF - J BIOL CHEM
SN - 0021-9258
IS - 11
ER -