advertisement
Abstract #56259 Published in IGR 16-1
Application of canaloplasty in glaucoma gene therapy: where are we?
Aktas Z; Tian B; McDonald J; Yamamato R; Larsen C; Kiland J; Kaufman PL; Rasmussen CAJournal of Ocular Pharmacology and Therapeutics 2014; 30: 277-282
PURPOSE: Schlemm's canal (SC) inner wall is adjacent to the juxtacanalicular trabecular meshwork (TM) over their entire circumference. We seek to transfer reporter and therapeutic genes to these outflow-modulating tissues via canaloplasty surgery in live monkeys. METHODS: A standard canaloplasty surgical approach was performed in cynomolgus monkeys using flexible canaloplasty catheters, modified for monkey eyes with a 175-μm outer diameter and an LED-lighted tip. A 6-0 prolene suture was used for the exact localization of SC. Trypan blue was injected during catheter withdrawal to document catheter placement within SC and to determine ease of injecting fluid into SC. Before, during, and after the injection, the position of the catheter and the anatomic details were video-captured with an externally positioned noncontact endoscopic imaging system and 50 mHz ultrasound biomicroscopy (UBM). RESULTS: A 360° catheterization and injection of dye into SC was achieved. Suture, catheter, and trypan blue were imaged with the endoscope camera system and the catheter was also visualized with UBM. Trypan blue was seen in the SC over 5 clock hours after a 1 clock-hour insertion of the catheter. CONCLUSIONS: A modified canaloplasty catheter device might be used for gene delivery to the SC/TM area without circumferential catheterization. Further studies comparing different delivery methods of the vector/transgene into the SC using canaloplasty are needed.
Full article
Classification:
11.9 Gene therapy (Part of: 11 Medical treatment)
12.8.3 Non-perforating (Part of: 12 Surgical treatment > 12.8 Filtering surgery)
