Ocular Delivery of PACAP1-27 Protects the Retina From Ischemic Damage in Rodents.

Abstract:

Purpose:Pituitary adenylate cyclase activating polypeptide (PACAP) is neuroprotective in neuronal injuries. Bilateral common carotid artery occlusion (BCCAO) causes chronic hypoperfusion-induced degeneration in the rat retina, where we proved the retinoprotective effect of intravitreal PACAP. Although this route of administration is a common clinical practice in several diseases, easier routes are clinically important. Our aim was to investigate the potential retinoprotective effects of PACAP eye drops in BCCAO-induced ischemic retinopathy. Methods:After performing BCCAO in rats, the right eyes were treated with PACAP1-27 eye drops (1 μg/drop, 2 × 1 drops/day for 5 days), containing different vehicles: saline, water for injections, thiomersal or benzalkonium solution for ophthalmic use (SOCB). Histology and immunohistochemistry were performed 2 weeks after surgery, while molecular analysis was performed 24 hours after BCCAO. Passage of PACAP1-27 through the ocular layers was tested with radioactive PACAP-SOCB in mice. Results:Bilateral common carotid artery occlusion led to a severe degeneration of all retinal layers. Solution for ophthalmic use was the most effective vehicle for delivering PACAP (PACAP-SOCB), significantly ameliorating BCCAO-induced damage. The massive upregulation of GFAP was not observed in retinas treated with PACAP-SOCB eye drops. PACAP-SOCB treatment also increased activation of the protective Akt and ERK1/2 in hypoperfused retinas. The cytokine profile showing upregulation in different cytokines was attenuated by PACAP-SOCB. Radioactive PACAP reached the retina when delivered in SOCB-containing eye drops. Conclusions:PACAP1-27, delivered in the SOCB vehicle as eye drops, was retinoprotective in ischemic retinopathy, providing the basis for future therapeutic administration.

authors

Werling D,Reglodi D,Banks WA,Salameh TS,Kovacs K,Kvarik T,Vaczy A,Kovacs L,Mayer F,Danyadi B,Lokos E,Tamas A,Toth G,Biro Z,Atlasz T

doi

10.1167/iovs.16-20630

subject

Has Abstract

pub_date

2016-12-01 00:00:00

pages

6683-6691

issue

15

eissn

0146-0404

issn

1552-5783

pii

2593013

journal_volume

57

pub_type

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