Daylight-Mediated, Passive, and Sustained Release of the Glaucoma Drug Timolol from a Contact Lens.
ACS Cent Sci
; 4(12): 1677-1687, 2018 Dec 26.
Article
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| MEDLINE
| ID: mdl-30648151
ABSTRACT
Timolol, a potent inhibitor of ß-adrenergic receptors (ßARs), is a first-line drug for decreasing the intraocular pressure (IOP) of patients with glaucoma. Timolol is administered using 0.5% eye-drop solutions at >3 × 107 times the inhibitory concentration (k i) for ßARs. This high dose is wasteful and triggers off-target effects that increase medication noncompliance. Here, we introduce contact lenses that release timolol to the eye throughout the day during passive exposures to natural daylight at a more therapeutically relevant concentration (>3000 k i). Timolol is coupled to the polymer of the contact lens via a photocleavable caged cross-linker and is released exclusively to the surrounding fluid after the 400-430 nm mediated cleavage of the cross-linking group. Studies conducted in a preclinical mouse model of glaucoma show photoreleased timolol is effective as authentic timolol in reducing IOP. Our studies highlight several advantages of daylight-mediated release of timolol from lenses compared to eye-drops. First, fitted contact lenses exposed to natural daylight release sufficient timolol to sustain the inhibition of ßARs over a 10 h period. Second, the contact lenses inhibit ßARs in the eye using only 5.7% of the timolol within a single eye-drop. Third, the lenses allow the patient to passively control the amount of timolol released from the lens-for example, early morning exposure to outdoor sunlight would release enough timolol to maximally reduce the IOP, whereas subsequent periodic exposures to indoor daylight would release sufficient timolol to overcome the effects of its spontaneous dissociation from ßARs. Fourth, our lenses are disposable, designed for single day use, and manufactured at a low cost.
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MEDLINE
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ACS Cent Sci
Año:
2018
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Article
País de afiliación:
Estados Unidos