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Drug class | Trace amine-associated receptor 1 (TAAR1) partial or full agonist |
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Chemical and physical data | |
Formula | C13H18N2O |
Molar mass | 218.300 g·mol−1 |
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RO5256390 or RO-5256390 is a drug developed by Hoffmann-La Roche which acts as an agonist for the trace amine associated receptor 1 (TAAR1). [1] [2] It is a full agonist of the rat, cynomolgus monkey, and human TAAR1, but a partial agonist of the mouse TAAR1. [1] [2]
RO5256390 is a full agonist of the rat, cynomolgus monkey, and human TAAR1, but a high-efficacy partial agonist of the mouse TAAR1. [1] [2]
Species | Affinity (Ki, nM) | EC50 (nM) | Emax (%) |
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Mouse | 4.4 | 2–18 | 68–79% |
Rat | 2.9 | 5.1 | 107% |
Monkey | 16 | 16 | 100% |
Human | 24 | 16 | 98% |
RO5256390 has been found to suppress the firing rates of ventral tegmental area (VTA) dopaminergic neurons and dorsal raphe nucleus (DRN) serotonergic neurons in mouse brain slices ex vivo . [1] [2] This effect was absent in slices from TAAR1 knockout mice. [1] [2] Similarly, acute RO5256390 suppressed VTA dopaminergic and DRN serotonergic neuronal excitability in rats in vivo , whereas the excitability of locus coeruleus (LC) noradrenergic neurons was unaffected. [3] In contrast with acute exposure however, chronic administration of RO5256390 for 14 days increased the excitability of VTA dopaminergic and DRN serotonergic neurons. [3] The drug has been found to dose-dependently block cocaine-induced inhibition of dopamine clearance (reuptake inhibition) in rat nucleus accumbens (NAc) slices ex vivo whilst having no effect on dopamine clearance by itself. [1] [4]
RO5256390 has been found to fully suppress the hyperlocomotion (a psychostimulant-like effect) induced by cocaine in rodents. [1] [2] In addition, it dose-dependently inhibited the hyperlocomotion induced by the NMDA receptor antagonists phencyclidine (PCP) and L-687,414. [1] [2] RO5256390 is said to produce a brain activity pattern similar to that of the antipsychotic olanzapine in rodents and hence is presumed to have antipsychotic-like properties. [2] In contrast to classical antipsychotics however, RO5256390 did not produce extrapyramidal-like symptoms in rodents and instead could reduce the catalepsy induced by haloperidol. [2] RO5256390 has been found to dose-dependently inhibit cocaine self-administration and context-triggered cocaine-seeking behavior in rodents. [1] [5] [6]
RO5256390 shows robust aversive and locomotor-suppressing effects in rodents that are dependent on TAAR1 activation. [7] Similar aversive effects have also been observed with other TAAR1 agonists like RO5263397 and RO5166017. [7] [8] RO5256390 has been shown to decrease motor hyperactivity, novelty-induced locomotor activity, and induce anxiolytic-like effects in the spontaneously hypertensive rat (SHR), a rodent model of attention deficit hyperactivity disorder (ADHD). [9] In contrast to the TAAR1 partial agonist RO5263397, RO5256390 did not produce antidepressant-like effects in rodents. [2] Conversely however, both agents produced antidepressant-like effects in monkeys. [2]
RO5256390 has been found to produce pro-cognitive effects in rodents and monkeys. [2] [10] It has been shown to strongly suppress rapid eye movement (REM) sleep in rodents. [11] On the other hand, it did not promote wakefulness in rodents. [2] RO5256390 has been shown to block compulsive and binge-like eating behavior in rats. [12] For this reason, it is being investigated as a potential drug to treat binge eating disorder. [12]
RO5256390 was first described in the scientific literature by 2013. [2]