Bone Grafts Research Today is a free monthly online journal that collates and summarizes the latest research about Bone Grafts, including details on spine fusion, surgery, procedure, risks. | ||||||||
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Prolonged survival of rat whole-limb allografts treated with cyclophosphamide, granulocyte colony-stimulation factor and FK506.Muramatsu K, You-Xin S, Hashimoto T, Matsunaga T, Gondo T, Taguchi T Department of Orthopedic Surgery, Yamaguchi University School of Medicine, Yamaguchi, Japan. marumatu@yamaguchi-u.ac.jp We evaluated the efficacy of a new protocol using cyclophosphamide (CYP), granulocyte colony-stimulation factor (G-CSF) and FK506 to induce high level chimerism following rat whole-limb allotransplantation. The present study investigated the dose requirement and toxicity of CYP monotherapy in inducing stable bone marrow chimerism. Fifty-six whole-limb allotransplants from LacZ transgenic rats to LEW rats were performed. CYP at a dose of 100 mg to 200 mg/kg was injected 2 days before transplantation and G-CSF of 25 microg/kg/day was given for 4 days. FK506 was used for 28 days at 1 mg/kg/day. The level of chimerism was evaluated by semi-quantitative polymerase chain reaction. The survival of limb allografts in recipients treated with CYP of 150 mg/kg was significantly prolonged to 107 days. The onset of rejection was more prolonged to 158 days in recipients with CYP of 200 mg/kg, with two of eight grafts surviving >1 year and three recipients (38%) showed chronic, nonlethal GVHD with a high level of bone marrow chimerism. Limb allografting could contribute to chimerism in the recipient. Pretreatment with CYP had the dose-dependent effects of prolonging the survival of limb allografts. A CYP dose of 200 mg/kg appears to significantly prolong limb graft survival but frequently causes chronic nonlethal GVHD in the longer surviving recipients. Published 11 September 2006 in Transpl Int, 19(10): 840-7.
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