RT Journal Article
A1 Robbie, Scott J.
A1 Lundh von Leithner, Peter
A1 Ju, Meihua
A1 Lange, Clemens A.
A1 King, Andrew G.
A1 Adamson, Peter
A1 Lee, Dennis
A1 Sychterz, Caroline
A1 Coffey, Pete
A1 Ng, Yin-Shan
A1 Bainbridge, James W.
A1 Shima, David T.
T1 Assessing a Novel Depot Delivery Strategy for Noninvasive Administration of VEGF/PDGF RTK Inhibitors for Ocular Neovascular Disease
JF Investigative Ophthalmology & Visual Science
JO IOVS
YR 2013
DO 10.1167/iovs.12-10169
JF Investigative Ophthalmology & Visual Science
VO 54
IS 2
SP 1490
OP 1500
SN 1552-5783
AB    Two noninvasive delivery strategies for VEGF/PDGF receptor tyrosine kinase inhibitors (RTKI) were explored that exploited uveal retention as a means for establishing an ocular drug depot: a single oral “loading” dose and topical administration.    Melanin binding was confirmed by centrifugation and mass spectrometry. Ocular retention was examined in pigmented and albino rats. Ocular release kinetics were measured 3 to 28 days postdosing in pigmented rats. Microautoradiography was used to demonstrate retention of RTKI in the uveal tract. A uveal drug depot of pazopanib was created by a single oral dose prior to induction of laser choroidal neovascularization (CNV). Choroid/retinal pigmented epithelium (RPE) retention of a related RTKI with enhanced topical bioavailability, GW771806, was confirmed by bioanalytics, and its ability to regress CNV compared with pazopanib.    Pazopanib and GW771806 directly bound melanin and were retained within the uveal tract of pigmented rats for weeks following a single oral dose. Pazopanib was undetectable systemically following a single oral administration prior to CNV induction, and reduced CNV as well as twice daily dosing. Topical ocular delivery of GW771806 at 5 mg/mL led to high choroidal/RPE exposure and significantly regressed CNV lesions; 2 mg/mL prevented lesion progression.    Uveal retention of drugs such as pazopanib can be used to create a sustained-release depot. Topical GW771806 regressed CNV. These data indicate that topical or infrequent oral loading dose treatment with VEGF/PDGF RTKI retained in the choroid/RPE might allow noninvasive treatments for ocular neovascular disease.  
RD 12/12/2019
UL https://doi.org/10.1167/iovs.12-10169