PNU-99,194

Last updated
PNU-99,194
PNU-99194A-structure.png
Clinical data
Routes of
administration 		Oral
ATC code
  • none
Legal status
Legal status
  • In general: uncontrolled
Identifiers
  • 5,6-dimethoxy-N,N-dipropyl-2,3-dihydro-1H-inden-2-amine
CAS Number
PubChem CID
ChemSpider
UNII
ChEMBL
CompTox Dashboard (EPA)
Chemical and physical data
Formula C17H27NO2
Molar mass 277.408 g·mol−1
3D model (JSmol)
  • O(c1cc2c(cc1OC)CC(N(CCC)CCC)C2)C

PNU-99,194(A) (or U-99,194(A)) is a drug which acts as a moderately selective D3 receptor antagonist with ~15-30-fold preference for D3 over the D2 subtype. [1] [2] [3] Though it has substantially greater preference for D3 over D2, the latter receptor does still play some role in its effects, as evidenced by the fact that PNU-99,194 weakly stimulates both prolactin secretion and striatal dopamine synthesis, actions it does not share with the more selective (100-fold) D3 receptor antagonists S-14,297 and GR-103,691. [4]

In rodent studies, low doses of PNU-99,194 produce conditioned place preference (CPP) with no effect on intracranial self-stimulation (ICSS), whereas low doses of D3 agonists like 7-OH-DPAT inhibit ICSS behavior and cause conditioned place aversion (CPA). [5] [6] [7] In contrast, high doses of PNU-99,194 produce CPA and inhibit ICSS, while high doses of 7-OH-DPAT result in the opposite. [5] [6] [7] Paralleling this, low doses of PNU-99,194 and 7-OH-DPAT induce hyperactivity and hypoactivity, respectively, whereas the inverse is seen at high doses with both agents. [2] [3] [7] [8] [9] [10] These data indicate that the D3 receptor has biphasic effects on reward mechanisms and locomotor activity, likely due to opposing roles of autoreceptors versus postsynaptic receptors. [8] [11]

Other effects of PNU-99,194 at low doses in rodents include increased nociceptive responses, [12] hypothermia, [4] [13] anxiolysis, [14] and facilitation of learning and memory, [12] [15] [16] [17] as well as augmentation and inhibition, respectively, of amphetamine-induced reward and behavioral sensitization, [18] [19] and reversal of morphine-induced CPP. [6] At high doses it inhibits the self-administration of cocaine in both rats and monkeys. [1] [20]

See also

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References

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  2. 1 2 Waters N, Svensson K, Haadsma-Svensson SR, Smith MW, Carlsson A (1993). "The dopamine D3-receptor: a postsynaptic receptor inhibitory on rat locomotor activity". Journal of Neural Transmission. General Section. 94 (1): 11–9. doi:10.1007/bf01244979. PMID   8129881. S2CID   32918280.
  3. 1 2 Kling-Petersen T, Ljung E, Svensson K (1995). "Effects on locomotor activity after local application of D3 preferring compounds in discrete areas of the rat brain". Journal of Neural Transmission. General Section. 102 (3): 209–20. doi:10.1007/bf01281155. PMID   8788069. S2CID   10327706.
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  9. ↑ Gyertyán I, Sághy K (July 2004). "Effects of dopamine D3 receptor antagonists on spontaneous and agonist-reduced motor activity in NMRI mice and Wistar rats: comparative study with nafadotride, U 99194A and SB 277011". Behavioural Pharmacology. 15 (4): 253–62. doi:10.1097/01.fbp.0000137857.26150.ab. PMID   15252275. S2CID   41821358.
  10. ↑ Rodríguez-Arias M, Felip CM, Broseta I, Miñarro J (May 1999). "The dopamine D3 antagonist U-99194A maleate increases social behaviors of isolation-induced aggressive male mice". Psychopharmacology. 144 (1): 90–4. doi:10.1007/s002130050981. PMID   10379629. S2CID   20953625. Archived from the original on 2000-07-12. Retrieved 2010-04-30.
  11. ↑ Meyer ME (October 1996). "Mesolimbic 7-OH-DPAT affects locomotor activities in rats". Pharmacology Biochemistry and Behavior. 55 (2): 209–14. doi:10.1016/S0091-3057(96)00066-4. PMID   8951956. S2CID   46728735.
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  13. ↑ Boulay D, Depoortere R, Rostene W, Perrault G, Sanger DJ (April 1999). "Dopamine D3 receptor agonists produce similar decreases in body temperature and locomotor activity in D3 knock-out and wild-type mice". Neuropharmacology. 38 (4): 555–65. doi:10.1016/S0028-3908(98)00213-5. PMID   10221759. S2CID   1004412.
  14. ↑ Rogóz Z, Kłodzińska A, Maj J (2000). "Anxiolytic-like effect of nafadotride and PNU 99194A, dopamine D3 receptor antagonists in animal models". Polish Journal of Pharmacology. 52 (6): 459–62. PMID   11334239.
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  16. ↑ Hale MW, Crowe SF (July 2002). "The effects of selective dopamine agonists on a passive avoidance learning task in the day-old chick". Behavioural Pharmacology. 13 (4): 295–301. doi:10.1097/00008877-200207000-00006. PMID   12218510. S2CID   24698131.
  17. ↑ Hammad H, Wagner JJ (January 2006). "Dopamine-mediated disinhibition in the CA1 region of rat hippocampus via D3 receptor activation". The Journal of Pharmacology and Experimental Therapeutics. 316 (1): 113–20. doi:10.1124/jpet.105.091579. PMID   16162819. S2CID   10007327.
  18. ↑ Carr KD, Yamamoto N, Omura M, Cabeza de Vaca S, Krahne L (August 2002). "Effects of the D(3) dopamine receptor antagonist, U99194A, on brain stimulation and d-amphetamine reward, motor activity, and c-fos expression in ad libitum fed and food-restricted rats". Psychopharmacology. 163 (1): 76–84. doi:10.1007/s00213-002-1132-0. PMID   12185403. S2CID   1840764.
  19. ↑ Chiang YC, Chen PC, Chen JC (May 2003). "D(3) dopamine receptors are down-regulated in amphetamine sensitized rats and their putative antagonists modulate the locomotor sensitization to amphetamine". Brain Research. 972 (1–2): 159–67. doi:10.1016/S0006-8993(03)02522-8. PMID   12711089. S2CID   40067321.
  20. ↑ Gál K, Gyertyán I (October 2003). "Targeting the dopamine D3 receptor cannot influence continuous reinforcement cocaine self-administration in rats". Brain Research Bulletin. 61 (6): 595–601. doi:10.1016/S0361-9230(03)00217-X. PMID   14519456. S2CID   12383682.
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