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ObjectiveTo study the changes of cellular immunity caused by intravenous infusion of allogenic rhesus mesenchymal stem cells (MSCs).MethodsMSCs were isolated and cultured.Then the immunomodulatory effects after MSCs infusion were evaluated by means of peripheral blood counts,mixed lymphocyte reaction (MLR) and analysis of lymphocytic subgroup. ResultsMSCs of rehsus were successfully cultivated. No acute toxicities or GVHD were observed in recipients. No obvious changes of peripheral blood counts were present. Recipients A2, A3, A4 were administered with MSC by 4.0 ×105/kg, 1.0 ×106/kg, 2.0×106/kg respectively and relative reaction (RR) of MLR decreased 14 days post MSCs infusion: from 46±2.6 ％to 40.4±1.73 ％ (F =10.19, P =0.023), from (40.9±2.3) ％ to (33±2.1) ％ (F =2.593, P =0.013), from 48.3±2.0 ％ to 39±1.0 ％ (F =28.431, P =0.003) respectively. The decrease degree (ARR) was positively related to the amount of MSCs(F =27.413, P =0.038). RR was restored within 30 days post MSCs infusion. After MSCs infusion, CD3+ CD3+CD4+ and CD3+CD8+ T-lymphocytes decreased in recipient A4, who was administered with the largest number of MSCs, and restored within 30 days. ConclusionMSCs infusion without any other treatment could temporarily inhibit immunity of T lymphocytes in MLR and the immunity inhibition was positively related to the amount of MSCs.The specific immunological characteristics of MSCs were demonstrated with extensive prospect in clinical research.
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Objective To explore the incidence ,clinical and neuroimaging features, possible risk factors and outcome of central nervous system (CNS) complications one year after hapilo-matched non-ablative hematopoietic stem cells transplantation. Methods The medical records of 36 consecutive patients who underwent hapilo-matched non-ablative hematopoietic stem cells transplantation for malignant and nonmalignant hematologic diseases between February 2004 and May 2009 were reviewed. Results CNS complications occurred in six (16.7 %) patients. Four of the six patients (66.7 %) died. Cerebral infarction occurred in three (8.3 %) patients. Cerebral softenness occurred in two (5.6 %) patients. Cerebral hemarrage occurred in 1 (2.8 %) patient. Epilepsy occurred in 1 (2.8 %) patient. The CNS complications occurred between 12 days and 286 days after stem cells transplantation. The age illness status and death rate were statistically different compared to patients without CNS complications (P ＜0.05). Conclusion The incidence and mortality of CNS complications are higher in those who underwent hapilo-matched non-ablative hematopoietic stem cells transplantation,which will make impacts on the patients' life quality and outcome.The illness status and eldly are probably the risk factors.