title: Enhancement of immunity against RSV-induced sarcomas by generation of hapten-reactive helper T lymphocytes.
abstract: Previous work from this laboratory has shown that preimmunization of syngeneic hosts with Rous sarcoma virus (RSV)-transformed cells elicits a strong immune response against the growth of transplantable RSV sarcomas, mediated by T lymphocytes expressing the surface phenotype of helper cell precursors (Prat, Di Renzo & Comoglio, 1983). This paper shows that anti-tumour immunity may be elicited in tumour-bearing animals by triggering an experimentally pre-amplified T-helper cell population at the site of tumour growth. Mice were treated with cyclophosphamide (which inactivates suppressor T cells) followed by skin sensitization to trinitrochlorobenzene (TNCB) according to a protocol that has been shown to induce an appreciably amplified generation of trinitrophenyl (TNP)-reactive helper T cells (Fujiwara et al., 1984). Five weeks after TNCB painting, mice were transplanted s.c. with a lethal dose of RSV-induced syngeneic sarcoma cells; the injection at the tumour site of TNCB induced the regression of the tumour in mice in which the TNP-helper cell population has been amplified, but not in controls, including those injected with a non-related hapten or sensitized to TNCB without inactivation of suppressors.
authors.forename: P M
authors.initials: PM
authors.lastname: Comoglio
authors.forename: M
authors.initials: M
authors.lastname: Prat
authors.forename: S
authors.initials: S
authors.lastname: Bretti
mesh_terms: D000818:Animals; D003520:Cyclophosphamide / Q000494:pharmacology; D000939:Epitopes; D006241:Haptens / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D009368:Neoplasm Transplantation; D010853:Picryl Chloride / Q000494:pharmacology; D001357:Sarcoma, Avian / Q000276:immunology*; D013154:Spleen / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*
chemical_list: D000939:Epitopes; D006241:Haptens; D003520:Cyclophosphamide; D010853:Picryl Chloride