title: Immunological studies of SK2 hybridoma cells microencapsulated with alginate-poly(L)lysine-alginate (APA) membrane following allogeneic transplantation.
abstract: Microencapsulation of living cells or tissues has been proposed to prevent their immune destruction following transplantation. In this study, we examined whether SK2 hybridoma cells microencapsulated in an alginate-poly(L)lysine-alginate (APA) membrane (APA-SK2 cells) were immunoisolated from the allogeneic host's immune system using a cytotoxicity test. The APA membrane inhibited the activation of the host's cellular immune response, but did not prevent the production of cytotoxic antibodies against entrapped SK2 cells following allogeneic transplantation. However, the APA-SK2 cells remained vital in SK2 cell-immunized mice as well as in intact mice. We considered that complement regulatory factors which were present on cell membrane and had species-specific restriction blocked the complement-mediated cell lysis on allogeneic transplantation, since APA-SK2 cells were destroyed by rabbit anti-SK2 cell antiserum. Our results demonstrated that APA membrane could inhibit cell-cell contact between entrapped cells and the host's lymphocytes, but could not completely protect the entrapped cells from xenogeneic humoral immunity.
authors.affiliation: Faculty and Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Okada
authors.forename: H
authors.initials: H
authors.lastname: Miyamoto
authors.forename: T
authors.initials: T
authors.lastname: Yoshioka
authors.forename: K
authors.initials: K
authors.lastname: Sakamoto
authors.forename: A
authors.initials: A
authors.lastname: Katsume
authors.forename: H
authors.initials: H
authors.lastname: Saito
authors.forename: S
authors.initials: S
authors.lastname: Nakagawa
authors.forename: Y
authors.initials: Y
authors.lastname: Ohsugi
authors.forename: T
authors.initials: T
authors.lastname: Mayumi
mesh_terms: D019264:Adoptive Transfer; D000464:Alginates / Q000494:pharmacology* / Q000627:therapeutic use; D000818:Animals; D002214:Capsules; D006825:Hybridomas / Q000276:immunology* / Q000637:transplantation*; D007274:Injections, Intraperitoneal; D008297:Male; D012515:Mast-Cell Sarcoma; D008567:Membranes, Artificial; D051379:Mice; D008810:Mice, Inbred C57BL; D011107:Polylysine / Q000031:analogs & derivatives* / Q000494:pharmacology / Q000627:therapeutic use; D011817:Rabbits; D014183:Transplantation, Heterologous; D014184:Transplantation, Homologous / Q000276:immunology*
chemical_list: D000464:Alginates; D002214:Capsules; D008567:Membranes, Artificial; C051546:alginate-polylysine-alginate; D011107:Polylysine