Daily Injection But Not Continuous Infusion of Apomorphine Inhibits Form-Deprivation Myopia in Mice

Investigative Ophthalmology & Visual Science
Tingting YanXiangtian Zhou

Abstract

To compare the effects of daily injection versus continuous infusion of a nonspecific dopamine agonist, apomorphine (APO), on refraction and ocular growth in normal postnatal mice and mice with form-deprivation myopia (FDM). The C57BL/6 mice were subjected (or not) to monocular FD by covering the left eye with a frosted goggle and leaving the right (fellow) eye uncovered. During postnatal days 28 to 56, both groups received APO (5 mg/kg/d) or vehicle either as daily intraperitoneal injection or by continuous subcutaneous infusion with mini-pumps. After these treatments, binocular refractions were measured by photoretinoscopy and binocular ocular dimensions were measured by optical coherence tomography. Monocular photopic flash electroretinograms were recorded from non-FD mice. In normal mice, daily injection or continuous infusion of APO did not affect normal postnatal development of refraction. However, in the FD group, daily APO-injection attenuated ocular growth and also myopia development, as reflected in the interocular differences for APO-injected mice compared with vehicle-injected mice: (1) refraction, -1.04 ± 0.37 diopter (D) (APO-injection) compared with -4.14 ± 0.77 D (vehicle-injection) (P < 0.05); (2) vitreous cham...Continue Reading

Citations

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