[Effects of Human Amniotic Mesenchymal Stem Cells on Acute Graft-Versus-Host Disease in Xenotransplantation].

Objective: To investigate the effects of human amniotic mesenchymal stem cell（AMSC） on acute graft-versus-host disease (aGVHD) in xenotransplatation.
Methods: NPG mice were injected with human PBMNC via tail vein to establish a xenografted aGVHD model. The mice in the experimental group were divided into PBMNC infusion group and PBMNC+AMSC co-infusion group, the general condition, survival time and manifestations of aGVHD were observed, the body weight and blood routine indicators were detected, the pathological changes of aGVHD target organs (lung, liver, spleen, small intestine) were observed by HE staining, and the levels of human T cells in peripheral blood, tissues and organs of mice was detected by flow cytometry.
Results: The manifestations of aGVHD (lassitude hunchback, shrub, weight reduction, etc.) and the pathological damage of the target organs (lung, liver, spleen, intestine) in PBMNC+AMSC co-infusion group were lighter than those in PBMNC infusion group. Moreover, the PBMNC and AMSC co-infusion significantly reduced the implantion proportion of human T lymphocytes (CD3 ⁺ , CD45 ⁺ ) in mice and increased the ratio of CD4 ⁺ /CD8 ⁺ .
Conclusion: Infusion of human-derived AMSC can attenuate the manifestations of aGVHD in mouse xenografts to a certain level, and improve the pathological damage of receptor target organs.