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Role of melatonin in the eye and ocular dysfunctions

Published online by Cambridge University Press:  30 January 2007

PER O. LUNDMARK ,
SEITHIKURIPPU R. PANDI-PERUMAL ,
VENKATARAMANUJAN SRINIVASAN  and
DANIEL P. CARDINALI
PER O. LUNDMARK
Affiliation:
Department of Optometry and Vision Sciences, Buskerud University College, Kongsberg, Norway
SEITHIKURIPPU R. PANDI-PERUMAL
Affiliation:
Comprehensive Center for Sleep Medicine, Department of Pulmonary, Critical Care and Sleep Medicine, Mount Sinai School of Medicine, New York, New York
VENKATARAMANUJAN SRINIVASAN
Affiliation:
Department of Physiology, School of Medical Sciences, University Sains Malaysia, Kubang kerian, Kelantan, Malaysia
DANIEL P. CARDINALI
Affiliation:
Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
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Abstract

Melatonin is a ubiquitous molecule and widely distributed in nature, with functional activity occurring in unicellular organisms, plants, fungi, and animals. Several studies have indicated that melatonin synthesis occurs in the retina of most vertebrates, including mammals. The retinal biosynthesis of melatonin and the mechanisms involved in the regulation of this process have been extensively studied. Circadian clocks located in the photoreceptors and retinal neurons regulate melatonin synthesis in the eye. Photoreceptors, dopaminergic amacrine neurons, and horizontal cells of the retina, corneal epithelium, stroma endothelium, and the sclera all have melatonin receptors, indicating a widespread ocular function for melatonin. In addition, melatonin is an effective antioxidant which scavenges free radicals and up-regulates several antioxidant enzymes. It also has a strong antiapoptotic signaling function, an effect that it exerts even during ischemia. Melatonin cytoprotective properties may have practical implications in the treatment of ocular diseases, like glaucoma and age-related macular degeneration.

Keywords

MelatoninRetinal phototransductionIntraocular pressureCorneal epitheliumAntioxidants

Information

Type
Research Article
Information
Visual Neuroscience , Volume 23 , Issue 6 , November 2006 , pp. 853 - 862
Copyright
© 2006 Cambridge University Press

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References

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