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Daylight-Mediated, Passive, and Sustained Release of the Glaucoma Drug Timolol from a Contact Lens
ACS Central Science ( IF 12.7 ) Pub Date : 2018-11-29 00:00:00 , DOI: 10.1021/acscentsci.8b00641
Changhua Mu 1 , Meng Shi 1 , Ping Liu 1 , Lu Chen 1 , Gerard Marriott 1
Affiliation  

Timolol, a potent inhibitor of β-adrenergic receptors (βARs), 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 (ki) for βARs. 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 ki). 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 βARs over a 10 h period. Second, the contact lenses inhibit βARs 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 βARs. Fourth, our lenses are disposable, designed for single day use, and manufactured at a low cost.

中文翻译:


日光介导的青光眼药物噻吗洛尔从隐形眼镜中的被动持续释放



噻吗洛尔是一种有效的 β-肾上腺素能受体 (βAR) 抑制剂,是降低青光眼患者眼压 (IOP) 的一线药物。使用 0.5% 滴眼液以 >3 × 10 7倍 βAR 抑制浓度 ( k ) 施用噻吗洛尔。这种高剂量是浪费,并会引发脱靶效应,从而增加用药依从性。在这里,我们介绍了隐形眼镜,在被动暴露于自然日光时,全天都会以更具有治疗相关性的浓度 (>3000 k ) 向眼睛释放噻吗洛尔。噻吗洛尔通过可光裂解的笼状交联剂与隐形眼镜的聚合物偶联,并在 400-430 nm 介导的交联基团裂解后专门释放到周围液体中。在青光眼临床前小鼠模型中进行的研究表明,光释放的噻吗洛尔在降低眼压方面与真正的噻吗洛尔一样有效。我们的研究强调了与滴眼剂相比,日光介导的噻吗洛尔从镜片中释放的几个优点。首先,暴露在自然光下的佩戴隐形眼镜会释放足够的噻吗洛尔,以在 10 小时内维持 βAR 的抑制。其次,隐形眼镜在单滴眼药水中仅使用 5.7% 的噻吗洛尔即可抑制眼内的 βAR。第三,镜片允许患者被动控制从镜片释放的噻吗洛尔的量,例如,清晨暴露于室外阳光下会释放足够的噻吗洛尔以最大限度地降低眼压,而随后定期暴露于室内日光下会释放足够的噻吗洛尔以最大程度地降低眼压。克服其与 βAR 自发解离的影响。第四,我们的镜片是一次性的,专为单日使用而设计,并且制造成本低廉。
更新日期:2018-11-29
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