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Serotonin (/ ˌ s ɛr ə ˈ t oʊ n ɪ n, ˌ s ɪər ə-/) [6] [7] [8] or 5-hydroxytryptamine (5-HT) is a monoamine neurotransmitter.Its biological function is complex, touching on diverse functions including mood, cognition, reward, learning, memory, and numerous physiological processes such as vomiting and vasoconstriction.
Meta analysis on cytokine levels in people with MDD have demonstrated increased levels of IL-1, IL-6, C-reactive protein, but not IL-10. [145] [146] Increased numbers of T-Cells presenting activation markers, levels of neopterin, IFN-γ, sTNFR, and IL-2 receptors have been observed in depression. [147]
5-Hydroxyindoleacetic acid (5-HIAA) is the main metabolite of serotonin. The metabolic intermediate 5-hydroxyindoleacetaldehyde (5-HIAL) is formed from serotonin by monoamine oxidase (MAO) and then 5-HIAA is formed from 5-HIAL via aldehyde dehydrogenase (ALDH). In chemical analysis of urine samples, 5-HIAA is used to determine serotonin levels ...
NHS figures show that the number of people in England taking antidepressants continues to rise, with 8.3m patients receiving them in 2021/22. No ‘clear evidence’ depression is caused by low ...
Decreasing levels of different serotonin receptors and the serotonin transporter (5-HTT), have also been shown to occur with age. Studies conducted using PET methods on humans, in vivo, show that levels of the 5-HT 2 receptor in the caudate nucleus , putamen , and frontal cerebral cortex, decline with age. [ 40 ]
A reference range is usually defined as the set of values 95 percent of the normal population falls within (that is, 95% prediction interval). [2] It is determined by collecting data from vast numbers of laboratory tests. [citation needed]
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Hone Health reports on the factors responsible for testosterone levels in men and how they are affected by age and lifestyle.