title: Expression of pertussis toxin adenosine diphosphate-ribosyltransferase in a T-cell hybridoma reduces metastatic capacity.
abstract: T-cell hybridomas are highly metastatic, and their in vitro invasiveness correlates with metastatic capacity. Invasion is blocked by pertussis toxin (PT), which adenosine diphosphate (ADP)-ribosylates G1-proteins, and we have provided evidence that the PT-sensitive signal stimulates leukocyte function-associated antigen-1 (LFA-1)-mediated adhesion required for invasion. PT pretreatment of TAM2D2 T-cell hybridoma cells reduced metastasis, but only to a limited extent. In the present study, we have transfected the cDNA of the PT ADP-ribosyltransferase S1 subunit into TAM2D2 cells to abrogate G1-protein function permanently. We report here a substantial reduction in the metastatic capacity of two transfectants, S05 and S09, in which 88% and 95% of the G1-proteins was ADP-ribosylated. Two-thirds of the mice injected with S09 cells were tumor-free. Metastasis to the liver was almost completely prevented and less metastases were formed in the spleen and kidneys. Metastasis formation by S05 cells in liver and spleen was much reduced, but in lymph nodes and peritoneal tissues, metastases occurred with a frequency similar to that of controls. We conclude that G1-proteins play an important role in T-cell hybridoma metastasis. We propose that the reduction in metastasis is due to diminished entry of tumor cells from the blood into tissues.
authors.affiliation: Division of Cell Biology, The Netherlands Cancer Institute, Amsterdam, The Netherlands.
authors.forename: M H
authors.initials: MH
authors.lastname: Driessens
authors.forename: E A
authors.initials: EA
authors.lastname: van Rijthoven
authors.forename: G
authors.initials: G
authors.lastname: La Rivière
authors.forename: E
authors.initials: E
authors.lastname: Roos
mesh_terms: D000818:Animals; D002448:Cell Adhesion; D015815:Cell Adhesion Molecules / Q000096:biosynthesis / Q000235:genetics; D018076:DNA, Complementary / Q000235:genetics; D005260:Female; D005347:Fibroblasts; D019206:GTP-Binding Protein alpha Subunits, Gi-Go / Q000378:metabolism*; D006825:Hybridomas / Q000201:enzymology / Q000473:pathology* / Q000637:transplantation; D051379:Mice; D008806:Mice, Inbred AKR; D009361:Neoplasm Invasiveness; D009362:Neoplasm Metastasis / Q000517:prevention & control*; D009363:Neoplasm Proteins / Q000096:biosynthesis / Q000235:genetics; D009368:Neoplasm Transplantation; D037342:Pertussis Toxin; D011065:Poly(ADP-ribose) Polymerases / Q000235:genetics / Q000378:metabolism*; D051381:Rats; D011994:Recombinant Proteins / Q000378:metabolism*; D013601:T-Lymphocytes / Q000201:enzymology / Q000473:pathology* / Q000637:transplantation; D014162:Transfection; D010566:Virulence Factors, Bordetella / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*
chemical_list: D015815:Cell Adhesion Molecules; D018076:DNA, Complementary; D009363:Neoplasm Proteins; D011994:Recombinant Proteins; D010566:Virulence Factors, Bordetella; D011065:Poly(ADP-ribose) Polymerases; D037342:Pertussis Toxin; D019206:GTP-Binding Protein alpha Subunits, Gi-Go