title: Role of T cell subsets in the maternal-to-neonatal transmission of immunity against Trichinella spiralis during lactation in rats.
abstract: We have previously demonstrated the maternal-to-neonatal transfer of immunity to T. spiralis during lactation and have shown that antigen-specific T lymphocytes, when injected into the mother or orally fed to neonates, can mediate this transfer. To further analyze the T cell subsets involved in conferring this protection, T lymphocytes were isolated from the mesenteric lymph nodes of syngeneic donor rats infected 4-6 days earlier with T. spiralis. The T cells were incubated in vitro with either mouse-anti-rat 0X8 or W3/25 monoclonal antibody, "panned" on plates coated with goat-anti-mouse Ig, and the non-adherent T helper or T cytotoxic/suppressor cells harvested. 100 x 10(6) T helper cells were injected i.v. into mothers once in early lactation and again two days prior to challenging their pups (200 T. spiralis larvae) at 2 weeks of age. This resulted in significant passage of immunity from the mothers to their suckling neonates, worm counts being 59% and 73% of control values 3 and 8 days post-challenge (P less than 0.01). Injection of T-cytotoxic/suppressor cells using the same regimen resulted in significant suppression of immunity in challenged pups, who retained worm counts that were 105% and 145% of control values at 3 and 8 days post-challenge. Synergy between recombined panned T-helper and T cytotoxic/suppressor cells without Ly1+2+3+ amplifier cells was tested by recombining non-adherent panned 0X8 and W3/25 cells. This resulted in no significant expressions of immunity in the pups when compared to controls. The presence of transferred maternal T cells within the neonate was evidenced by the fact that neonates (nursing on immune mothers) had significant (P less than 0.01) delayed footpad reactions to a crude T. spiralis antigen preparation, as compared with neonates nursing on non-immune controls.
authors.affiliation: Department of Cellular Biology and Anatomy, Louisiana State University Medical Center, Shreveport 71130.
authors.forename: S N
authors.initials: SN
authors.lastname: Kumar
authors.forename: G L
authors.initials: GL
authors.lastname: Stewart
authors.forename: W M
authors.initials: WM
authors.lastname: Steven
authors.forename: L L
authors.initials: LL
authors.lastname: Seelig
mesh_terms: D000818:Animals; D005260:Female; D006968:Hypersensitivity, Delayed / Q000139:chemically induced; D007112:Immunity, Maternally-Acquired; D007774:Lactation; D011247:Pregnancy; D051381:Rats; D011919:Rats, Inbred Strains; D013601:T-Lymphocytes / Q000276:immunology*; D014234:Trichinella / Q000276:immunology*