Seletracetam interacts to the synaptic vesicle protein SV2A and reduces seizure activity in several epilepsy models[2]. Synaptic responses are reduced by seletracetam in a concentration-, frequency-, and time-dependent manner[2]. In vitro, seletracetam reduces intracellular Ca2+ accumulation and high-voltage-activated Ca2+ currents in rat cortical neurons[3].

Absorption, Distribution and Excretion
Seletracetam is rapidly absorbed following oral administration, reaching the Cmax within 1 hour and displaying oral bioavailability of >90%.
Primarily eliminated through renal excretion. It is as mainly excreted as unchanged drug (30%) and an acidic metabolite ucb-101596-1 (60%).
The volume of distribution is approximately 0.6 L/kg, which is close to that of total body water.
The total apparent clearance is approximately 0.8mL/min/kg.

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Metabolism / Metabolites
It undergoes hydrolysis of the acetamide group to form the carboxylic acid metabolite ucb-101596-1, which is pharmacologically inactive.

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Biological Half-Life
Approximately 8 hours in healthy young male subjects.

Protein Binding
Demonstrates low plasma protein binding (<10%)

[1]. Seletracetam, a small molecule SV2A modulator for the treatment of epilepsy. Curr Opin Investig Drugs. 2008 Jan;9(1):101-7.

[2]. Seletracetam (ucb 44212) inhibits high-voltage-activated Ca2+ currents and intracellular Ca2+ increase in rat cortical neurons in vitro. Epilepsia. 2009 Apr;50(4):702-10.

[3]. Seletracetam enhances short term depression in vitro. Epilepsy Res. 2015 Nov;117:17-22.

Seletracetam is an organonitrogen compound and an organooxygen compound. It is functionally related to an alpha-amino acid.
Seletracetam is a pyrrolidone derivative and with a structural similarity to newer generation antiepileptic drug levetiracetam. It binds to the same target as levetiracetam but with higher affinity and has shown potent seizure suppression in models of acquired and genetic epilepsy with high CNS tolerability. It is predicted to have low drug-drug interactions and inhibition or induction of any major human metabolizing enzymes. Seletracetam was in Phase II clinical trials under the supervision of the U.S. Food and Drug Administration (FDA) investigated as treatment of epilepsy and partial epilepsy however its development had been put on hold in July 2007. As of 2010, its production was further halted due to the investigation of a newer antiepileptic agent, brivaracetam.

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Drug Indication
Investigated for use/treatment in epilepsy.

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Mechanism of Action
Seletracetam binds to SV2A in a stereospecific and selective manner. SV2A is a membrane glycoprotein present in synaptic vesicles of neurons that plays a role as calcium regulators in neurotransmitter release and modulate synaptic networks. Seletracetam is thought to reduce excessive neuronal activity by modulating SV2A function and restoring the ability of a neuron to regulate its neurotransmitter release. Seizure generation induces a sustained membrane depolarization causing a prolonged firing of voltage-dependent calcium currents sufficient to induce a significant rise in calcium concentration. High voltage-activated calcium currents are inhibited by seletracetam by blocking N-type calcium channels in the pyramidal neurons. The drug reduces the degree of calcium influx and decreases the intraneuronal calcium concentration, blocking the abnormal fluctuations in membrane potential occurring during epileptic discharges.

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Pharmacodynamics
Seletracetam is an antiepileptic agent that targets the presynaptic mechanisms of epilepsy. It interferes with synaptic vesicle exocytosis and neurotransmitter release by binding to synaptic vesicle protein 2A (SV2A) which is involved in synaptic vesicle docking and fusion. It is also a N-type calcium channel blocker that inhibits the abnormal neuronal discharge by inhibiting the calcium channel function and associated calcium currents. Seletracetam markedly reduces epileptiform markers of both hyper-excitability and hyper-synchronization in an in vitro slice model of epilepsy and potently suppresses seizures in in vivo epilepsy models mimicking both partial and generalized epilepsy.

C10H14F2N2O2

232.2308

232.102

357336-74-4

Seletracetam lithium;Seletracetam lithium bromide;2024584-38-9

9942725

Off-white to light yellow solid powder

1.966

1

4

4

16

327

2

CC[C@@H](N1C[C@H](/C=C(\F)/F)CC1=O)C(=O)N

ANWPENAPCIFDSZ-RQJHMYQMSA-N

InChI=1S/C10H14F2N2O2/c1-2-7(10(13)16)14-5-6(3-8(11)12)4-9(14)15/h3,6-7H,2,4-5H2,1H3,(H2,13,16)/t6-,7+/m1/s1

(2S)-2-[(4S)-4-(2,2-difluoroethenyl)-2-oxopyrrolidin-1-yl]butanamide

UCB-44212 UCB44212 UCB 44212 Seletracetam

2934.99.9001

Powder      -20°C    3 years

                     4°C     2 years

In solvent   -80°C    6 months

                  -20°C    1 month

Note: Please store this product in a sealed and protected environment (e.g. under nitrogen), avoid exposure to moisture.

Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

DMSO : ~200 mg/mL (~861.22 mM)

Note: Listed below are some common formulations that may be used to formulate products with low water solubility (e.g. < 1 mg/mL), you may test these formulations using a minute amount of products to avoid loss of samples.

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Injection Formulation 1: DMSO : Tween 80： Saline = 10 : 5 : 85 (i.e. 100 μL DMSO stock solution → 50 μL Tween 80 → 850 μL Saline)
*Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH ₂ O to obtain a clear solution.
Injection Formulation 2: DMSO : PEG300 ：Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL DMSO → 400 μLPEG300 → 50 μL Tween 80 → 450 μL Saline)
Injection Formulation 3: DMSO : Corn oil = 10 : 90 (i.e. 100 μL DMSO → 900 μL Corn oil)
Example: Take the Injection Formulation 3 (DMSO : Corn oil = 10 : 90) as an example, if 1 mL of 2.5 mg/mL working solution is to be prepared, you can take 100 μL 25 mg/mL DMSO stock solution and add to 900 μL corn oil, mix well to obtain a clear or suspension solution (2.5 mg/mL, ready for use in animals).

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Injection Formulation 4: DMSO : 20% SBE-β-CD in saline = 10 : 90 [i.e. 100 μL DMSO → 900 μL (20% SBE-β-CD in saline)]
*Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution.
Injection Formulation 5: 2-Hydroxypropyl-β-cyclodextrin : Saline = 50 : 50 (i.e. 500 μL 2-Hydroxypropyl-β-cyclodextrin → 500 μL Saline)
Injection Formulation 6: DMSO : PEG300 : castor oil : Saline = 5 : 10 : 20 : 65 (i.e. 50 μL DMSO → 100 μLPEG300 → 200 μL castor oil → 650 μL Saline)
Injection Formulation 7: Ethanol : Cremophor : Saline = 10： 10 : 80 (i.e. 100 μL Ethanol → 100 μL Cremophor → 800 μL Saline)
Injection Formulation 8: Dissolve in Cremophor/Ethanol (50 : 50), then diluted by Saline
Injection Formulation 9: EtOH : Corn oil = 10 : 90 (i.e. 100 μL EtOH → 900 μL Corn oil)
Injection Formulation 10: EtOH : PEG300：Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL EtOH → 400 μLPEG300 → 50 μL Tween 80 → 450 μL Saline)

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Oral Formulation 1: Suspend in 0.5% CMC Na (carboxymethylcellulose sodium)
Oral Formulation 2: Suspend in 0.5% Carboxymethyl cellulose
Example: Take the Oral Formulation 1 (Suspend in 0.5% CMC Na) as an example, if 100 mL of 2.5 mg/mL working solution is to be prepared, you can first prepare 0.5% CMC Na solution by measuring 0.5 g CMC Na and dissolve it in 100 mL ddH2O to obtain a clear solution; then add 250 mg of the product to 100 mL 0.5% CMC Na solution, to make the suspension solution (2.5 mg/mL, ready for use in animals).

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Oral Formulation 3: Dissolved in PEG400
Oral Formulation 4: Suspend in 0.2% Carboxymethyl cellulose
Oral Formulation 5: Dissolve in 0.25% Tween 80 and 0.5% Carboxymethyl cellulose
Oral Formulation 6: Mixing with food powders

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Note: Please be aware that the above formulations are for reference only. InvivoChem strongly recommends customers to read literature methods/protocols carefully before determining which formulation you should use for in vivo studies, as different compounds have different solubility properties and have to be formulated differently.

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 (Please use freshly prepared in vivo formulations for optimal results.)