In light of its only recently discovered dopaminergic activity, conclusions drawn from studies that employed WAY-100635 as a selective 5-HT1A antagonist may need to be re-evaluated.[5]
In relating its binding to subject variables one Swedish study found WAY-100635 binding in raphe brain region correlating with self-transcendence and spiritual acceptance personality traits.[8]
WAY-100635 binding has also been assessed in connection with clinical depression, where there has been disagreement about the presence and direction of the 5-HT1A receptor binding.[9]
In healthy subjects WAY-100635 binding has been found to decline with age,[10]
— though not all studies have found this relationship.[11][12]
Human WAY-100635 binding neuroimaging studies (patients compared to healthy control subjects).
Reducing in binding in raphe in both treated and untreated. Reduced binding in global postsynaptic regions for untreated, while no or little reduction for treated.
WAY-100635 has also been found to increase the analgesic effects of opioid drugs in a dose-dependent manner, in contrast to 5-HT1A agonists such as 8-OH-DPAT which were found to reduce opioid analgesia.[23][24] However, since 5-HT1A agonists were also found to reduce opioid-induced respiratory depression and WAY-100635 was found to block this effect,[25] it is likely that 5-HT1A antagonists might worsen this side effect of opioids. Paradoxically, chronic administration of the very high efficacy 5-HT1A agonist befiradol results in potent analgesia following an initial period of hyperalgesia, an effect most likely linked to desensitisation and/or downregulation of 5-HT1A receptors (i.e. analogous to a 5-HT1A antagonist-like effect).[26][27][28] As with other 5-HT1A silent antagonists such as UH-301 and robalzotan, WAY-100635 can also induce a head-twitch response in rodents.[29]
^Marona-Lewicka D, Nichols DE (2009). "WAY 100635 produces discriminative stimulus effects in rats mediated by dopamine D(4) receptor activation". Behav Pharmacol. 20 (1): 114–8. doi:10.1097/FBP.0b013e3283242f1a. PMID19179855. S2CID43332577.
^A. Fletcher, E. A. Forster, D. J. Bill, G. Brown, I. A. Cliffe, J. E. Hartley, D. E. Jones, A. McLenachan, K. J. Stanhope, D. J. Critchley, K. J. Childs, V. C. Middlefell, L. Lanfumey, R. Corradetti, A. M. Laporte, H. Gozlan, M. Hamon & C. T. Dourish (1996). "Electrophysiological, biochemical, neurohormonal and behavioural studies with WAY-100635, a potent, selective and silent 5-HT1A receptor antagonist". Behavioural Brain Research. 73 (1–2): 337–53. doi:10.1016/0166-4328(96)00118-0. PMID8788530. S2CID18229202.((cite journal)): CS1 maint: multiple names: authors list (link)
^Chemel, Benjamin R.; Roth, Bryan L.; Armbruster, Blaine; Watts, Val J.; Nichols, David E. (October 2006). "WAY-100635 is a potent dopamine D<Subscript>4</Subscript> receptor agonist". Psychopharmacology. 188 (2): 244–251. doi:10.1007/s00213-006-0490-4. ISSN0033-3158. PMID16915381. S2CID24194034.
^ abRabiner EA; Messa C; Sargent PA; Husted-Kjaer K; Montgomery A; Lawrence AD; Bench CJ; Gunn RN; Cowen P; Grasby PM. (March 2002). "A database of [11C]WAY-100635 binding to 5-HT1A receptors in normal male volunteers: normative data and relationship to methodological, demographic, physiological, and behavioral variables". NeuroImage. 15 (3): 620–632. doi:10.1006/nimg.2001.0984. PMID11848705. S2CID42080193.
^ abcdR. V. Parsey; M. A. Oquendo; N. R. Simpson; R. T. Ogden; R. Van Heertum; V. Arango V; J. J. Mann (November 2002). "Effects of sex, age, and aggressive traits in man on brain serotonin 5-HT1A receptor binding potential measured by PET using [C-11]WAY-100635". Brain Research. 954 (2): 173–182. doi:10.1016/S0006-8993(02)03243-2. PMID12414100. S2CID20650203.
^Wayne C. Drevets, Ellen Frank, Julie C. Price, David J. Kupfer, Daniel Holt, Phil J. Greer, Yiyun Huang, Clara Gautier and Chester Mathis (November 1999). "Pet imaging of serotonin 1A receptor binding in depression". Biological Psychiatry. 46 (10): 1375–1387. doi:10.1016/S0006-3223(99)00189-4. PMID10578452. S2CID719822.((cite journal)): CS1 maint: multiple names: authors list (link)
^Victor W. Pike, Julie A. McCarron, Adriaan A. Lammerstma, Susan P. Hume, Keith Poole, Paul M. Grasby, Andrea Malizia, Ian A. Cliffe, Allan Fletcher & Christopher J. Bench (September 1995). "First delineation of 5-HT1A receptors in human brain with PET and [11C]WAY-100635". European Journal of Pharmacology. 283 (s 1–3): R1–R3. doi:10.1016/0014-2999(95)00438-Q. PMID7498295.((cite journal)): CS1 maint: multiple names: authors list (link)
^Victor W. Pike, Julie A. McCarron, Adriaan A. Lammertsma, Safiye Osman, Susan P. Hume, Peter A. Sargent, Christopher J. Bench, Ian A. Cliffe, Alan Fletcher and Paul M. Grasby (April 1996). "Exquisite delineation of 5-HT1A receptors in human brain with PET and [carbonyl-11C]WAY-100635". European Journal of Pharmacology. 301 (1–3): R5–R7. doi:10.1016/0014-2999(96)00079-9. PMID8773468.((cite journal)): CS1 maint: multiple names: authors list (link)
^Susan P. Hume, Sharon Ashworth, Jolanta Opacka-Juffry, Randal G. Ahier, Adriaan A. Lammertsma, Victor W. Pike, Ian A. Cliffe, Allan Fletcher and Alan C. White (December 1994). "Evaluation of [O-methyl-3H]WAY-100635 as an in vivo radioligand for 5-HT1A receptors in rat brain". European Journal of Pharmacology. 271 (2–3): 515–523. doi:10.1016/0014-2999(94)90813-3. PMID7705452.((cite journal)): CS1 maint: multiple names: authors list (link)
^P. W. J. Burnet, S. L. Eastwood & P. J. Harrison (June 1997). "[3H]WAY-100635 for 5-HT1A receptor autoradiography in human brain: a comparison with [3H]8-OH-DPAT and demonstration of increased binding in the frontal cortex in schizophrenia". Neurochemistry International. 30 (6): 565–574. doi:10.1016/S0197-0186(96)00124-6. PMID9152998. S2CID21135585.
^Berrocoso E, De Benito MD, Mico JA (July 2007). "Role of serotonin 5-HT1A and opioid receptors in the antiallodynic effect of tramadol in the chronic constriction injury model of neuropathic pain in rats". Psychopharmacology. 193 (1): 97–105. doi:10.1007/s00213-007-0761-8. PMID17393145. S2CID21898521.
^Sahibzada N, Ferreira M, Wasserman AM, Taveira-DaSilva AM, Gillis RA (February 2000). "Reversal of morphine-induced apnea in the anesthetized rat by drugs that activate 5-hydroxytryptamine(1A) receptors". The Journal of Pharmacology and Experimental Therapeutics. 292 (2): 704–13. PMID10640309.
^Bardin L, Assié MB, Pélissou M, Royer-Urios I, Newman-Tancredi A, Ribet JP, Sautel F, Koek W, Colpaert FC (March 2005). "Dual, hyperalgesic, and analgesic effects of the high-efficacy 5-hydroxytryptamine 1A (5-HT1A) agonist F 13640 [(3-chloro-4-fluoro-phenyl)-[4-fluoro-4-{[(5-methyl-pyridin-2-ylmethyl)-amino]-methyl}piperidin-1-yl]methanone, fumaric acid salt]: relationship with 5-HT1A receptor occupancy and kinetic parameters". The Journal of Pharmacology and Experimental Therapeutics. 312 (3): 1034–42. doi:10.1124/jpet.104.077669. PMID15528450. S2CID42446435.