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Action at a Distance: Systemically Administered Adult Stem/Progenitor Cells (MSCs) Reduce Inflammatory Damage to the Cornea Without Engraftment and Primarily by Secretion of TNF-α Stimulated Gene/Protein 6 *

Previous reports demonstrated that the deleterious effects of chemical injury to the cornea were ameliorated by local or systemic administration of adult stem/progenitor cells from bone marrow referred to as mesenchymal stem or stromal cells (MSCs). However, the mechanisms for the beneficial effects of MSCs on the injured cornea were not clarified. Herein, we demonstrated that human MSCs (hMSCs) were effective in reducing corneal opacity and inflammation without engraftment after either intraperitoneal (i.p.) or intravenous (i.v.) administration following chemical injury to the rat cornea. A quantitative assay for human mRNA for glyceraldehyde 3-phosphate dehydrogenase (GAPDH) demonstrated that less than 10 hMSCs were present in the corneas of rats 1-day and 3 days after i.v. or i.p. administration of 1 × 107 hMSCs. In vitro experiments using a transwell coculture system demonstrated that chemical injury to corneal epithelial cells activated hMSCs to secrete the multipotent anti-inflammatory protein TNF-α stimulated gene/protein 6 (TSG-6). In vivo, the effects of i.v. injection of hMSCs were largely abrogated by knockdown of TSG-6. Also, the effects of hMSCs were essentially duplicated by either i.v. or topical administration of TSG-6. Therefore, the results demonstrated that systemically administered hMSCs reduce inflammatory damage to the cornea without engraftment and primarily by secretion of the anti-inflammatory protein TSG-6 in response to injury signals from the cornea. STEM CELLS 2011;29:1572–1579

URL: http://onlinelibrary.wiley.com/doi/10.1002/stem.708/full

* Legal Disclaimer: Chelation and Hyperbaric Therapy, Stem Cell Therapy, and other treatments and modalities mentioned or referred to in this web site are medical techniques that may or may not be considered “mainstream”. As with any medical treatment, results will vary among individuals, and there is no implication or guarantee that you will heal or achieve the same outcome as patients herein.

As with any procedure, there could be pain or other substantial risks involved. These concerns should be discussed with your health care provider prior to any treatment so that you have proper informed consent and understand that there are no guarantees to healing.

THE INFORMATION IN THIS WEBSITE IS OFFERED FOR GENERAL EDUCATIONAL PURPOSES ONLY AND DOES NOT IMPLY OR GIVE MEDICAL ADVICE. No Doctor/Patient relationship shall be deemed to have arisen simply by reading the information contained on these pages, and you should consult with your personal physician/care giver regarding your medical treatment before undergoing any sort of treatment or therapy.

Published on 10-08-2014