BACKGROUND: Transforming growth factor (TGF)-beta inhibits the maturation and function of antigen-presenting cells. Our purpose was to evaluate the impact of retroviral delivery of human TGF-beta1 to murine myeloid dendritic cell (DC) progenitors on (i) their in vitro properties, (ii) their in vivo function, and (iii) their influence on organ allograft survival. METHODS: C57BL10 (B10; H2b) bone marrow cells were lineage depleted and stimulated with granulocyte-macrophage colony-stimulating factor for 6 days. Replicating DC progenitors were transduced on days 2, 3, and 4 of culture by ecotropic retrovirus encoding human TGF-beta1 using centrifugal enhancement. Secretion of TGF-beta1 and other cytokines was quantified by enzyme immunoassay. Allogeneic C3H/HeJ (C3H; H2k) T-cell proliferative responses and generation of cytotoxic T lymphocytes in mixed leukocyte reaction were determined by [3H]thymidine incorporation and 51Cr release assays, respectively. DC migration was analyzed by immunohistochemistry, and their impact on survival of intra-abdominal heart transplants was determined. RESULTS: Maximal TGF-beta1 transduction efficiency was 60%. The TGF-beta-transduced DC showed pronounced impairment (>80%) of T-cell allostimulatory activity in vitro. After their IV injection, B10 TGF-beta-transduced DC (IAb+) were detected in T-cell areas of spleens of allogeneic C3H recipients. Splenic T-cell responses to donor alloantigens of mice that received TGF-beta-transduced DC were severely impaired. This was accompanied by marked inhibition of interleukin-2 and interferon-gamma production in response to restimulation with donor alloantigen. Survival of B10 cardiac allografts in C3H mice given B10 TGF-beta-transduced DC (2x106 IV, 7 days before transplantation), was extended modestly but significantly. CONCLUSION: Retroviral transduction of myeloid DC progenitors to overexpress TGF-beta is associated with marked impairment of their T-cell allostimulatory activity but with only modest prolongation of organ allograft survival.
BACKGROUND:Transforming growth factor (TGF)-beta inhibits the maturation and function of antigen-presenting cells. Our purpose was to evaluate the impact of retroviral delivery of humanTGF-beta1 to murinemyeloid dendritic cell (DC) progenitors on (i) their in vitro properties, (ii) their in vivo function, and (iii) their influence on organ allograft survival. METHODS: C57BL10 (B10; H2b) bone marrow cells were lineage depleted and stimulated with granulocyte-macrophage colony-stimulating factor for 6 days. Replicating DC progenitors were transduced on days 2, 3, and 4 of culture by ecotropic retrovirus encoding humanTGF-beta1 using centrifugal enhancement. Secretion of TGF-beta1 and other cytokines was quantified by enzyme immunoassay. Allogeneic C3H/HeJ (C3H; H2k) T-cell proliferative responses and generation of cytotoxic T lymphocytes in mixed leukocyte reaction were determined by [3H]thymidine incorporation and 51Cr release assays, respectively. DC migration was analyzed by immunohistochemistry, and their impact on survival of intra-abdominal heart transplants was determined. RESULTS: Maximal TGF-beta1 transduction efficiency was 60%. The TGF-beta-transduced DC showed pronounced impairment (>80%) of T-cell allostimulatory activity in vitro. After their IV injection, B10 TGF-beta-transduced DC (IAb+) were detected in T-cell areas of spleens of allogeneic C3H recipients. Splenic T-cell responses to donor alloantigens of mice that received TGF-beta-transduced DC were severely impaired. This was accompanied by marked inhibition of interleukin-2 and interferon-gamma production in response to restimulation with donor alloantigen. Survival of B10 cardiac allografts in C3H mice given B10 TGF-beta-transduced DC (2x106 IV, 7 days before transplantation), was extended modestly but significantly. CONCLUSION: Retroviral transduction of myeloid DC progenitors to overexpress TGF-beta is associated with marked impairment of their T-cell allostimulatory activity but with only modest prolongation of organ allograft survival.
Authors: Mu Li; Hua Qian; Thomas E Ichim; Wei-Wen Ge; Igor A Popov; Katarzyna Rycerz; John Neu; David White; Robert Zhong; Wei-Ping Min Journal: Immunol Res Date: 2004 Impact factor: 2.829
Authors: Amy E Anderson; David J Swan; Bethan L Sayers; Rachel A Harry; Angela M Patterson; Alexei von Delwig; John H Robinson; John D Isaacs; Catharien M U Hilkens Journal: J Leukoc Biol Date: 2008-11-06 Impact factor: 4.962