TRANSPLANTATION OF EXPANDED LIMBAL EPITHELIAL STEM CELLS

点击翻译按钮获取中文摘要

DESCRIPTION (provided by applicant): Corneal diseases manifesting limbal stem cell deficiency remain to be one of the most difficult and challenging conditions for clinicians to manage. Ever since PI's reintroduction in 1995 of transplantation of preserved human amniotic membrane for ocular surface reconstruction, a number of studies have shown that amniotic membrane transplantation is effective in facilitating epithelial wound healing, and reducing stromal inflammation, scarring and unwanted new blood vessel formation. Amniotic membrane transplantation for ocular surface reconstruction has been approved by FDA and Medicare. Under RO1 EY06819 support, PI has gathered sufficient laboratory and pre-clinical rabbit data to support the hypothesis that such preserved amniotic membrane is also an ideal substrate to restore the "stromal niche" essential for successful ex vivo expansion of limbal epithelial stem cells. PI has obtained an IND (No.10313) from US Food & Drug Administration (FDA) and an IRB approval to translate the aforementioned basic research to clinical application by conducting a Phase I clinical trial to accomplish the following two Aims: Aim 1: To confirm the safety and efficacy of autologous ex vivo expanded limbal epithelial stem cells for reconstructing corneal surfaces with unilateral total limbal stem cell deficiency. Aim 2: To confirm the safety and efficacy of allogeneic ex vivo expanded limbal epithelial stem cells for reconstructing corneal surfaces with bilateral total limbal stem cell deficiency. Completion of this clinical trial will prove, for the first time that the said new surgical technique can be used to alleviate symptoms and to restore sights for patients inflicted with total limbal stem cell deficiency. With further modification and improvement made during subsequent clinical trials, this new technology may be developed into a commercial product (FDA's classification as a "Biologics"). Furthermore, from such a platform of ex vivo manipulation based on FDA's cGMP guidelines, new therapeutics may also be developed in the future by gene therapies targeted at expanded limbal epithelial stem cells.