Abstract:
OBJECTIVE:To evaluate the feasibility of a new technique for the implantation of ultrathin substrates containing stem cell-derived retinal pigment epithelium (RPE) cells into the subretinal space of retina-degenerate Royal College of Surgeon (RCS) rats. METHODS:A platform device was used for the implantation of 4-µm-thick parylene substrates containing a monolayer of human embryonic stem cell-derived RPE (hESC-RPE). Normal Copenhagen rats (n = 6) and RCS rats (n = 5) were used for the study. Spectral-domain optical coherence tomography (SD-OCT) scanning and histological examinations were performed to confirm placement location of the implant. hESC-RPE cells attached to the substrate before and after implantation were evaluated using standard cell counting techniques. RESULTS:SD-OCT scanning and histological examination revealed that the substrates were precisely placed in the rat's subretinal space. The hESC-RPE cell monolayer that covered the surface of the substrate was found to be intact after implantation. Cell counting data showed that less than 2% of cells were lost from the substrate due to the implantation procedure (preimplantation count 2,792 ± 74.09 cells versus postimplantation count 2,741 ± 62.08 cells). Detailed microscopic examination suggested that the cell loss occurred mostly along the edges of the implant. CONCLUSION:With the help of this platform device, it is possible to implant ultrathin substrates containing an RPE monolayer into the rat's subretinal space. This technique can be a useful approach for stem cell-based tissue bioengineering techniques in retinal transplantation research.
journal_name
Ophthalmic Resjournal_title
Ophthalmic researchauthors
Hu Y,Liu L,Lu B,Zhu D,Ribeiro R,Diniz B,Thomas PB,Ahuja AK,Hinton DR,Tai YC,Hikita ST,Johnson LV,Clegg DO,Thomas BB,Humayun MSdoi
10.1159/000338749subject
Has Abstractpub_date
2012-01-01 00:00:00pages
186-91issue
4eissn
0030-3747issn
1423-0259pii
000338749journal_volume
48pub_type
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