5-HT(1A) receptors and lower urinary tract function and ‘fight-or-flight’ conditions

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Home of Kyle J. Norton for The Better of Living & Living Health Serotonin or 5-hydroxytryptamine (5-HT) is a monoamine neurotransmitter derived from tryptophan,  primarily found in the gastrointestinal (GI) tract, platelets, and in the central nervous system (CNS). In Gut, serotonin regulates intestinal movements, in CNS, it regulates mood, appetite, sleep, memory and learning, etc,.
5-HT(1A) receptors and lower urinary tract function and ‘fight-or-flight‘ conditions
In the study to examine the role of 5-HT(1A) receptors in control of lower urinary tract function in cats,  using 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) and 5-methoxy-N,N-dimethyltryptamine (5-MeODMT) as agonists and WAY100635 and LY206130 as antagonists, found that  5-HT(1A) receptor stimulation is inhibitory to bladder function in cats, especially under conditions where the bladder is hyperactive due to irritation. Furthermore, these bladder-inhibitory effects are the exact opposite of the bladder-excitatory effects of 8-OH-DPAT reported in rats. 5-HT(1A) receptor stimulation increases EUS motoneuron activity when driven by nociceptive bladder afferent inputs but not when driven by non-nociceptive afferent inputs. In summary, 5-HT(1A) receptor agonists facilitate a nociceptor-driven spinal reflex (sphincter activity) but inhibit a nociceptor-driven supraspinal reflex (micturition). This pattern of activity would facilitate urine storage and may be important under ‘fight-or-flight‘ conditions when serotonergic activity is high(42).

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Sources
(42) http://www.ncbi.nlm.nih.gov/pubmed/12137933  http://medicaladvisorjournals.blogspot.com

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