Tesofensine

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Tesofensine
Tesofensine chemical structure.png
Systematic (IUPAC) name
(1R,2R,3S)-3-(3,4-dichlorophenyl)-2-(ethoxymethyl)-8-methyl-8-azabicyclo[3.2.1]octane
Clinical data
Pregnancy cat. Not applicable
Legal status Investigatory new drug
Routes Oral
Pharmacokinetic data
Bioavailability 90%
Metabolism 15–20% renal; hepatic: CYP3A4
Half-life 220 hours
Excretion Not applicable
Identifiers
CAS number 195875-84-4 N
ATC code None
PubChem CID 11370864
ChemSpider 9545781 N
UNII BLH9UKX9V1 YesY
Chemical data
Formula C17H23Cl2NO 
Mol. mass 328.277 g/mol
 N (what is this?)  (verify)

Tesofensine (NS2330) is a serotonin–noradrenaline–dopamine reuptake inhibitor from the phenyltropane family of drugs, which is being developed for the treatment of obesity.[1] The right to develop and market tesofensine is held by NeuroSearch, a Danish pharmaceutical company.

History[edit]

Tesofensine was originally investigated for the treatment of Alzheimer's disease and Parkinson's disease,[2] and was subsequently dropped from development for these applications after early trial results showed limited efficacy for treatment of these diseases.[3][4] However, weight loss was consistently reported as an adverse event in the original studies, especially in overweight or obese patients.[5] Therefore, it was decided to pursue development of tesofensine for the treatment of obesity.

Tesofensine primarily acts as an appetite suppressant, but possibly also acts by increasing resting energy expenditure.[6] Phase 2 trials for the treatment of obesity have been successfully completed.

Pharmacology[edit]

Metabolism and t½[edit]

Tesofensine has a long half-life of about 9 days (220 h)[2] and is mainly metabolized by cytochrome P4503A4 (CYP3A4) to the N-normethyl-metabolite NS2360.[7][8] NS2360 is the only metabolite detectable in human plasma. It has a longer half-life than tesofensine, i.e. approximately 16 days (374 h) in humans, and has an exposure of 31–34% of the parent compound at steady state. In vivo data indicate that NS2360 is responsible for approximately 6% of the activity of tesofensine. As in animals, the kidney appears to play only a minor role in the clearance of tesofensine in humans (about 15–20%).

Transporter selectivity[edit]

Originally it had been reported that Tesofensine has IC50 of 8.0, 3.2 and 11.0nM at the DAT, NAT and 5HTT.[9] More recently, though, the following data was submitted: IC50 (nM) NE 1.7, SER 11, DA 65.[[10] cited in [11]] The revised IC50's would adequately explain the lack of efficacy in treating PD, i.e. insufficient DRI potency relative to the SERT and the NET. This could also help account for why TF is not reliably self-administered by human stimulant abusers[12] since it has been believed to be the case that DAT blockade is necessary for this and not NET blockade.[13][14]

Tesofensine also indirectly potentiates cholinergic neurotransmission[15] proven to have beneficial effects on cognition, particularly in learning and memory. Sustained treatment with tesofensine has been shown to increase BDNF levels in the brain, and may possibly have an antidepressant effect.[10]

Clinical trials[edit]

Phase 2b trial (TIPO-1) results reported in The Lancet[16] showed levels of weight loss over a 6-month period that were significantly greater than those achieved with any currently available drugs. Patients lost an average of 12.8 kg on the 1 mg dose, 11.3 kg on the 0.5 mg dose and 6.7 kg on the 0.25 mg dose, compared with a 2.2 kg loss in the placebo group.

All participants were instructed to follow a diet with a 300 kcal deficit and to increase their physical activity gradually to 30–60 minutes of exercise per day. The placebo-subtracted mean weight losses were 4.5%, 9.2% and 10.6% in the 0.25 mg, 0.5 mg and 1 mg dose groups, respectively. This is approximately twice the weight loss produced by medications currently approved by the US Food and Drug Administration (FDA) for the treatment of obesity.

NeuroSearch has also reported interim results[6] from a 48-week, open-label, extension trial (TIPO-4) in which 140 patients who completed the 24-week phase 2b trial (TIPO-1) were re-enrolled after an average of 3 months’ wash-out. All were initially treated with 0.5 mg tesofensine once daily but up-titration to 1.0 mg once daily was allowed in the first 24 weeks of the extension study. At this time point, all subjects were continued on the 0.5 mg dose for an additional 24 weeks. The 24-week interim results for those who were previously treated with tesofensine 0.5 mg in TIPO-1 showed a total mean weight loss of between 13 kg and 14 kg over 48 weeks of treatment. Furthermore, TIPO-4 confirmed the TIPO-1 results since those patients who were previously treated with placebo lost approximately 9 kg in the first 24 weeks of the TIPO-4 study.

Adverse events[edit]

In general, the safety profile of tesofensine is similar to currently approved medications for the treatment of obesity. The most commonly reported side effects in the obese population were dry mouth, headache, nausea, insomnia, diarrhoea and constipation. A dose-dependent pattern was observed for dry mouth and insomnia. The overall withdrawal rate due to adverse events in clinical trials in the obese population was 13% with tesofensine and 6% with placebo. Blood pressure and heart rate increases with the therapeutically relevant doses of tesofensine (0.25 mg and 0.5 mg) were 1–3 mmHg and up to 8 bpm, respectively.[6][16]

References[edit]

  1. ^ Doggrell SA. "Tesofensine – a novel potent weight loss medicine. Evaluation of: Astrup A, Breum L, Jensen TJ, Kroustrup JP, Larsen TM. Effect of tesofensine on bodyweight loss, body composition, and quality of life in obese patients: a randomised, double-blind, placebo-controlled trial. Lancet 2009 372; 1906–13" Doggrell, SA (2009). "Tesofensine--a novel potent weight loss medicine. Evaluation of: Astrup A, Breum L, Jensen TJ, Kroustrup JP, Larsen TM. Effect of tesofensine on bodyweight loss, body composition, and quality of life in obese patients: a randomised, double-blind, placebo-controlled trial. Lancet 2008;372:1906-13.". Expert Opin Investig Drugs 18 (7): 1043–6. doi:10.1517/13543780902967632. PMID 19548858. 
  2. ^ a b Bara-Jimenez W, Dimitrova T, Sherzai A, Favit A, Mouradian MM, Chase TN (2004). "Effect of monoamine reuptake inhibitor NS 2330 in advanced Parkinson's disease". Mov Disord 19: 1183–6. doi:10.1002/mds.20124. PMID 15390018. 
  3. ^ Hauser R, Salin L, Juhel N, Konyago V. (2007). "Randomized trial of the triple monoamine reuptake inhibitor NS 2330 (tesofensine) in early Parkinson's disease". Mov Disord 22: 359–65. doi:10.1002/mds.21258. PMID 17149725. 
  4. ^ Rascol O, Poewe W, Lees A et al (2008). "Tesofensine (NS 2330), a monoamine reuptake inhibitor, in patients with advanced Parkinson disease and motor fluctuations: the ADVANS Study". Arch Neurol 65: 577–83. doi:10.1001/archneur.65.5.577. PMID 18474731. 
  5. ^ Astrup A, Meier DH, Mikkelsen BO, Villumsen JS, Larsen TM. (2008). "Weight loss produced by tesofensine in patients with Parkinson's or Alzheimer's disease". Obesity (Silver Spring) 16 (6): 1363–9. doi:10.1038/oby.2008.56. PMID 18356831. 
  6. ^ a b c NeuroSearch. "Tesofensine". http://www.neurosearch.dk/Default.aspx?ID=118 Accessed 17 May 2010.
  7. ^ Lehr T, Staab A, Tillmann C et al (2007). "Population pharmacokinetic modelling of NS2330 (tesofensine) and its major metabolite in patients with Alzheimer's disease". Br J Clin Pharmacol 64: 36–48. doi:10.1111/j.1365-2125.2007.02855.x. PMID 17324246. 
  8. ^ Lehr T, Staab A, Tillmann C (2008). "Contribution of the active metabolite M1 to the pharmacological activity of tesofensine in vivo: a pharmacokinetic-pharmacodynamic modelling approach". Br J Pharmacol 153: 164–74. doi:10.1038/sj.bjp.0707539. PMC 2199391. PMID 17982477. 
  9. ^ Jorgen Scheel-Kruger, Peter Moldt, Frank Watjen. Tropane-derivatives, their preparation and use. U.S. Patent 6,288,079
  10. ^ a b Larsen, M.; Rosenbrock, H.; Sams-Dodd, F.; Mikkelsen, J. (2007). "Expression of brain derived neurotrophic factor, activity-regulated cytoskeleton protein mRNA, and enhancement of adult hippocampal neurogenesis in rats after sub-chronic and chronic treatment with the triple monoamine re-uptake inhibitor tesofensine". European Journal of Pharmacology 555 (2–3): 115–121. doi:10.1016/j.ejphar.2006.10.029. PMID 17112503.  edit
  11. ^ Marks, D.; Pae, C.; Patkar, A. (2008). "Triple reuptake inhibitors: the next generation of antidepressants". Current neuropharmacology 6 (4): 338–343. doi:10.2174/157015908787386078. PMC 2701280. PMID 19587855.  edit
  12. ^ Schoedel, K. A.; Meier, D.; Chakraborty, B.; Manniche, P. M.; Sellers, E. M. (2010). "Subjective and Objective Effects of the Novel Triple Reuptake Inhibitor Tesofensine in Recreational Stimulant Users". Clinical Pharmacology & Therapeutics 88 (1): 69–78. doi:10.1038/clpt.2010.67. PMID 20520602.  edit
  13. ^ Wee, S.; Wang, Z.; He, R.; Zhou, J.; Kozikowski, A.; Woolverton, W. (2006). "Role of the increased noradrenergic neurotransmission in drug self-administration". Drug and alcohol dependence 82 (2): 151–157. doi:10.1016/j.drugalcdep.2005.09.002. PMID 16213110.  edit
  14. ^ Wee, S.; Woolverton, W. L. (2004). "Evaluation of the reinforcing effects of atomoxetine in monkeys: comparison to methylphenidate and desipramine". Drug and Alcohol Dependence 75 (3): 271–276. doi:10.1016/j.drugalcdep.2004.03.010. PMID 15283948.  edit
  15. ^ http://eprints.qut.edu.au/29667/1/c29667.pdf
  16. ^ a b Astrup A, Madsbad S, Breum L, Jensen TJ, Kroustrup JP, Larsen TM (2008). "Effect of tesofensine on bodyweight loss, body composition, and quality of life in obese patients: a randomised, double-blind, placebo-controlled trial". Lancet 372: 1906–13. doi:10.1016/S0140-6736(08)61525-1. PMID 18950853. 

External links[edit]