title: Studies of allogeneic bone marrow and spleen cell transplantation in a murine model using ultraviolet-B light.
abstract: Ultraviolet irradiation inhibits alloreactive and mitogen-induced responses and might reduce both graft-versus-host and host-versus-graft reactions after bone marrow transplantation (BMT). We have studied proliferative responses to mitogens and reactivity in mixed lymphocyte culture after irradiation with ultraviolet (UV)-B light using splenocytes from Balb/c (H-2d) and CBA (H-2k) mice. Response to mitogens and in MLC was strongly inhibited by 20 J/m2 and abolished at 50 J/m2. Clonogenic cell recovery (CFU-GM; CFU-S) after UV-B irradiation was also reduced. When bone marrow and spleen cells were transplanted from parent (Balb/c) animals into F1 hybrid (Balb/c X CBA) recipients, all animals died with features indicative of graft-versus-host disease (GVHD) in 34 days. If the grafts were first irradiated with 100 J/m2 of UV-B at a mean wavelength of 310 nm, then 76% survived to day 80 when they were killed and shown to have normal marrow cellularity. The remainder died in marrow aplasia or of GVHD. H-2 typing in a group of surviving recipients showed either donor hematopoiesis only (8 of 15), mixed allogeneic chimerism (5 of 15), or recipient type hematopoiesis (2 of 15). Higher doses (200 to 300 J/m2) were detrimental to survival with 88% of recipients dying in marrow aplasia. Syngeneic BMT in Balb/c mice showed slower hematopoietic reconstitution when the grafts were first irradiated with 100 J/m2. After BMT from Balb/c to CBA mice all recipients of unirradiated grafts died within 54 days. By contrast, after graft irradiation with 100 J/m2 survival of recipient animals to day 80 was 59%. If these grafts were treated with 50 J/m2 survival was only 26% with an increase in deaths due to GVHD. Hematopoiesis at day 80 in a group of survivors studied by Ig heavy chain allotyping indicated donor type hematopoiesis in 6 of 10 (50 J/m2) and 2 of 9 (100 J/m2). These data indicate that UV-B irradiation inhibits lymphocyte reactivity and can prevent GVHD. However, there is clear in vitro and in vivo evidence of stem cell damage, such that autologous marrow recovery was demonstrated in a proportion of recipients. In parent----F1 UV-irradiated transplants, sustained hematopoietic recovery was effected in the majority by donor stem cells.
authors.affiliation: South Western Regional Transfusion Centre, Bristol, UK.
authors.forename: D H
authors.initials: DH
authors.lastname: Pamphilon
authors.forename: A A
authors.initials: AA
authors.lastname: Alnaqdy
authors.forename: V
authors.initials: V
authors.lastname: Godwin
authors.forename: A W
authors.initials: AW
authors.lastname: Preece
authors.forename: T B
authors.initials: TB
authors.lastname: Wallington
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000528:radiation effects; D016026:Bone Marrow Transplantation; D002455:Cell Division; D003114:Colony-Forming Units Assay; D003208:Concanavalin A / Q000494:pharmacology; D006086:Graft vs Host Disease / Q000517:prevention & control; D006410:Hematopoiesis; D006824:Hybridization, Genetic; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D008214:Lymphocytes / Q000166:cytology; D051379:Mice; D008807:Mice, Inbred BALB C; D008808:Mice, Inbred CBA; D010835:Phytohemagglutinins / Q000494:pharmacology; D013154:Spleen / Q000166:cytology / Q000528:radiation effects / Q000637:transplantation*; D014466:Ultraviolet Rays
chemical_list: D010835:Phytohemagglutinins; D003208:Concanavalin A