Dysregulated 24 h melatonin secretion associated with intrinsically photosensitive retinal ganglion cell function in diabetic retinopathy: a cross-sectional study
Authors:
Sirimon Reutrakul, Jason C. Park, J. Jason McAnany, Felix Y. Chau, Kirstie K. Danielson, Bharati Prasad, Andrew Cross, Stephanie Sintetas, Julie Law, Silvana Pannain, Sarida Pratuangtham, Eve Van Cauter, Erin C. Hanlon
The aim of this study was to explore whether diabetic retinopathy is associated with alterations of the circadian system, and to examine the role of reduced intrinsically photosensitive retinal ganglion cell (ipRGC) function.
Methods
Participants with type 2 diabetes, with diabetic retinopathy (n=14) and without diabetic retinopathy (n=9) underwent 24 h blood sampling for melatonin and cortisol under controlled laboratory conditions. ipRGC function was inferred from the post-illumination pupil response (PIPR). Habitual sleep duration, efficiency and variability were assessed by actigraphy.
Results
Participants with diabetic retinopathy compared to participants without diabetic retinopathy had smaller PIPR (p=0.007), lower 24 h serum melatonin output (p=0.042) and greater day-to-day sleep variability (p=0.012). By contrast, 24 h cortisol profiles, sleep duration and efficiency were similar in both groups. Six individuals with diabetic retinopathy had no detectable dim-light melatonin onset. PIPR correlated with 24 h mean melatonin levels (r=0.555, p=0.007).
Conclusions/interpretation
ipRCG dysfunction in diabetic retinopathy is associated with disruptions of the 24 h melatonin rhythm, suggesting circadian dysregulation in diabetic retinopathy.
Dysregulated 24 h melatonin secretion associated with intrinsically photosensitive retinal ganglion cell function in diabetic retinopathy: a cross-sectional study
Authors
Sirimon Reutrakul Jason C. Park J. Jason McAnany Felix Y. Chau Kirstie K. Danielson Bharati Prasad Andrew Cross Stephanie Sintetas Julie Law Silvana Pannain Sarida Pratuangtham Eve Van Cauter Erin C. Hanlon
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