RESUMO
Although previous studies have demonstrated the efficient modulatory effects of ultraviolet radiation B (UVB) on cutaneous graft-versus-host disease (GVHD), most animal research on GVHD has been performed in murine models of acute GVHD. Here, we studied the preventive effect of UVB radiation on the occurrence of chronic sclerodermatous (Scl) GVHD in a murine model. Scl GVHD was induced by transplanting lethally irradiated BALB/c mice with B10.D2 bone marrow and spleen cells. Recipient mice were exposed to UVB before or after bone marrow and spleen cell infusion. Histological and clinical evaluation of GVHD was performed, in association with the characterization of epidermal Langerhans cells. UVB irradiation of recipients after, and more remarkably before, transplantation induced a decrease of Scl GVHD severity associated with epidermal Langerhans cells depletion. We conclude that UVB irradiation of recipient before or after transplantation has a preventive effect on cutaneous Scl GVHD and may represent an effective strategy for prevention of Scl GVHD.
Assuntos
Transplante de Medula Óssea/imunologia , Transplante de Medula Óssea/patologia , Transfusão de Linfócitos , Esclerodermia Limitada/radioterapia , Esclerodermia Limitada/cirurgia , Transplante Homólogo/imunologia , Transplante Homólogo/patologia , Raios Ultravioleta , Animais , Modelos Animais de Doenças , Doença Enxerto-Hospedeiro/imunologia , Doença Enxerto-Hospedeiro/patologia , Imuno-Histoquímica , Células de Langerhans/patologia , Células de Langerhans/efeitos da radiação , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Endogâmicos , Baço/transplanteRESUMO
Orbital presentation of non-Hodgkin's Lymphoma (NHL) is uncommon but occurs both as the only site of disease and as a site of recurrence. Primary orbital NHLs are usually low-grade, and mostly extranodal marginal zone/mucosa associated lymphoid tissue B-cell neoplasms. They are commonly associated with chronic inflammatory conditions. The issue of bilaterality in orbital lymphoma is not very common. The onset of malignant lymphoproliferation may precede, follow, or exist simultaneously with scleroderma. Different treatment modalities were applied in orbital NHL such as surgery, radiation therapy, chemotherapy or both. We report a 57-year-old man with scleroderma presenting with eyelid hernias who had biopsy-proven marginal zone NHL, successfully treated with radiotherapy and combined chemotherapy, and also review the literature.