Bone marrow-derived mesenchymal stem cells ameliorate autoimmune enteropathy independently of regulatory T cells

Stem Cells
Biju ParekkadanMartin L Yarmush

Abstract

Cell-based tolerogenic therapy is a relatively new approach for the treatment of autoimmune diseases. Mesenchymal stem cells (MSCs) have been shown to be potent immunomodulatory agents in a number of experimental and clinical scenarios; however, their use in various autoimmune diseases is undefined. Herein, we report the efficacy of MSC transplantation in a multiorgan autoimmunity model. Mice with defective peripheral tolerance caused by a deficiency in regulatory T cells were used as a testbed for therapy. After screening multiple target tissues of autoimmune attack, we observed an MSC-specific improvement in the histopathology of the distal ileum of treated mice. We then showed that MSCs can reduce mesenteric lymph node (MLN) cellularity in autoimmune mice during active disease and decrease activated T-cell populations in the MLN. Trafficking studies using enhanced green fluorescent protein (eGFP)-reporter MSCs revealed no appreciable engraftment in the intestine, but it did reveal the presence of eGFP+ cells organized in clusters within the MLN, as well as ancillary nodes. Semiquantitative analysis showed no difference in the number of clusters; however, eGFP+ cells in MLNs compared with ancillary nodes had distinct fibrobla...Continue Reading

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