Pineal volume and evening melatonin in young people with affective disorders.
Affective disorders in young people have been associated with disruptions in circadian rhythms, including abnormalities in secretion of the pineal hormone melatonin. Previous research reports relationships between pineal gland volumes, melatonin secretion, and sleep-wake cycles, but the relationship between these factors has not been explored in affective disorders. This study aimed to characterize these factors and explore associations with mood symptoms and functioning in a sample of young people with affective disorders. Pineal volume from magnetic resonance imaging and melatonin assay from evening dim-light saliva collection were evaluated in 50 individuals (15-30 years old; 72 % female) with bipolar, depressive, or anxiety disorders. Actigraphy monitoring was also conducted for approximately two weeks to derive sleep-wake measures. Pineal volume was associated with melatonin secretion across the evening, replicating previous findings in psychiatrically healthy individuals. Pineal volume was smaller in participants in which melatonin onset was not detected. Timing of melatonin secretion was related to sleep timing, but amount of melatonin and pineal volume were not related to any sleep-wake measures. A shorter phase angle between onset of melatonin secretion and sleep onset was associated with longer total sleep time. Lower melatonin levels were associated with poorer social and occupational functioning. Although pineal volume is not directly related to sleep disturbances or symptoms, melatonin may influence both sleep-wake cycles and functioning in the early stages of affective disorder. Causal links remain to be established, however, treatments that target circadian rhythms may be useful in improving functioning in young people with affective disorders.
Brain and Mind Centre, University of Sydney, 94 Mallet Street, Camperdown, NSW, 2050, Australia. joanne.carpenter@sydney.edu.au.
Joanne S
JS
Carpenter
Brain and Mind Centre, University of Sydney, 94 Mallet Street, Camperdown, NSW, 2050, Australia.
Amy C
AC
Abelmann
Brain and Mind Centre, University of Sydney, 94 Mallet Street, Camperdown, NSW, 2050, Australia.|Department of Psychiatry, University of California San Diego, La Jolla, CA, USA.
Sean N
SN
Hatton
Brain and Mind Centre, University of Sydney, 94 Mallet Street, Camperdown, NSW, 2050, Australia.|Institute of Mental Health Research, University of Ottawa, Ottawa, ON, Canada.
Rébecca
R
Robillard
Brain and Mind Centre, University of Sydney, 94 Mallet Street, Camperdown, NSW, 2050, Australia.
Daniel F
DF
Hermens
Brain and Mind Centre, University of Sydney, 94 Mallet Street, Camperdown, NSW, 2050, Australia.
Maxwell R
MR
Bennett
Brain and Mind Centre, University of Sydney, 94 Mallet Street, Camperdown, NSW, 2050, Australia.|Sunshine Coast Mind and Neuroscience- Thompson Institute, University of the Sunshine Coast, Birtinya, QLD, Australia.
Jim
J
Lagopoulos
Brain and Mind Centre, University of Sydney, 94 Mallet Street, Camperdown, NSW, 2050, Australia.
Ian B
IB
Hickie
D056044:Actigraphy; D000293:Adolescent; D000328:Adult; D002940:Circadian Rhythm / Q000502:physiology; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008550:Melatonin / Q000378:metabolism*; D019964:Mood Disorders / Q000000981:diagnostic imaging* / Q000378:metabolism* / Q000473:pathology; D009929:Organ Size; D017440:Photoperiod; D010870:Pineal Gland / Q000000981:diagnostic imaging* / Q000473:pathology; D011569:Psychiatric Status Rating Scales; D012463:Saliva / Q000378:metabolism; D012890:Sleep; D055815:Young Adult
D008550:Melatonin
Affective disorders; Circadian; MRI; Melatonin; Pineal gland; Sleep