Abstract
The pineal gland is a neuroendocrine organ located in the epithalamus. The gland’s major task is the synthesis and release of melatonin, a versatile hormone regulating many physiological body functions involving circadian rhythms, sleep processes, temperature regulation, inflammation, and reproduction. The pineal gland and its effects are currently experiencing an emerging body of interest among scientists, physicians, and even the general population. Against this backdrop, a substantial effort of research has been conducted to uncover potential pathophysiological impacts of melatonin. Sleep disorders, cancer, several psychiatric diseases, such as affective disorders and schizophrenia, as well as neurological disorders, e.g., Parkinson’s disease and Alzheimer’s disease, might be associated with malfunctions of melatonin secretion patterns.
Despite this, only a few studies have investigated potential interrelations between both pineal gland morphology and/or pineal gland volume and these disorders. A very recent study found lower pineal volume in patients with primary insomnia compared to healthy controls. A similar phenomenon was found in male patients suffering from schizophrenia, whereas pineal volume was not reduced in bipolar patients.
Further studies are needed in the future to clarify whether an alteration of the pineal volume and morphology and subsequent changes in melatonin release might also be associated with other physical and/or mental illnesses and whether advanced imaging techniques might assess pineal function more accurately.
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- AA-NAT:
-
Arylalkylamine N-acetyltransferase
- aMT6s:
-
6-Sulphatoxymelatonin
- ASMT:
-
Acetylserotonin methyltransferase
- CT:
-
Computed tomography
- FLAIR:
-
Fluid-attenuated inversion recovery
- MPRAGE:
-
Magnetization-prepared rapid gradient echo
- MRI:
-
Magnetic resonance imaging
- PGV:
-
Pineal gland volume
- TrueFISP:
-
True fast imaging with steady-state precession
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Acknowledgments
We would like to thank Ms. U. Schmid for editing this article. We gratefully acknowledge the gentle possibility to use figures already published in the Journal of Sleep Research and the Journal of Magnetic Resonance Imaging.
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The authors declare no conflict of interest.
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Bumb, J.M., Nölte, I.S. (2016). Neuroimaging of the Pineal Gland: Focus on Primary Insomnia. In: López-Muñoz, F., Srinivasan, V., de Berardis, D., Álamo, C., Kato, T. (eds) Melatonin, Neuroprotective Agents and Antidepressant Therapy. Springer, New Delhi. https://doi.org/10.1007/978-81-322-2803-5_3
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