Iomazenil

Iomazenil
Identifiers

IUPAC name ethyl 7-iodanyl-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylate
Synonyms	Ro 16-0154
CAS Number	127985-21-1^Y 127396-36-5 (¹²³I)
PubChem (CID)	65959
ChemSpider	59362
UNII	7DVX185FLQ^Y Template:UNII (¹²³I) Template:UNII (¹²³I)
ChEMBL	CHEMBL2105020
Chemical and physical data
Formula	C₁₅H₁₄¹²³IN₃O₃
Molar mass	407.290 g/mol
3D model (Jmol)	Interactive image
SMILES CCOC(=O)c1c2n(cn1)-c3cccc(c3C(=O)N(C2)C)I
InChI InChI=1S/C15H14IN3O3/c1-3-22-15(21)13-11-7-18(2)14(20)12-9(16)5-4-6-10(12)19(11)8-17-13/h4-6,8H,3,7H2,1-2H3/i16-4 Key:FRIZVHMAECRUBR-KIWWSDKQSA-N

Iomazenil (also known as Ro16-0154, INN, USAN; benzodine) is an antagonist and partial inverse agonist of benzodiazepine and a potential treatment for alcohol abuse. The compound was introduced in 1989 by pharmaceutical company Hoffmann-La Roche as an Iodine-123-labelled SPECT tracer for imaging benzodiazepine receptors (GABA_A receptors) in the brain. Iomazenil is an analogue of flumazenil (Ro15-1788).^[1]

Use in brain research

¹²³I-labelled iomazenil can be used to image epileptic seizure foci as an alternative to ¹⁸F-fludeoxyglucose PET imaging.^[2]^[3]

The effect of iomazenil of reducing levels of GABA in the brain was used by researchers to exacerbate symptoms in patients with schizophrenia in a laboratory study, supporting the theory that a GABA deficiency underlies that disease.^[4]

Alcohol treatment

Researcher Deepak D'Souza and colleagues at Yale University and Veterans Affairs Connecticut Healthcare System are testing iomazenil as a potential treatment for drunkenness due to its ability to bind alcohol receptors in the brain.^[5]

References

↑ Höll, K; Deisenhammer E; Dauth J; Carmann H; Schubiger PA (1989). "Imaging benzodiazepine receptors in the human brain by single photon emission computed tomography (SPECT)". Int J Rad Appl Instrum B. 16 (8): 759–63.
↑ Kung, Hank F.; Mei-Ping Kung; Seok Rye Choi (January 2003). "Radiopharmaceuticals for single-photon emission computed tomography brain imaging". Seminars in Nuclear Medicine. 33 (1): 2–13. doi:10.1053/snuc.2003.127296. PMID 12605353.
↑ Goethals, I; Van de Wiele C; Boon P; Dierckx R (February 2003). "Is central benzodiazepine receptor imaging useful for the identification of epileptogenic foci in localization-related epilepsies?". Eur J Nucl Med Mol Imaging. 30 (2): 325–8.
↑ Ahn, Kyungheup; Gil R; Seibyl J; Sewell RA; D'Souza DC (February 2011). "Probing GABA receptor function in schizophrenia with iomazenil". Neuropsychopharmacology. Nature Publishing Group. 36 (3): 677–83. doi:10.1038/npp.2010.198. PMC 3055690. PMID 21068719.
↑ Dobson, Roger; Jonathan Owen (13 May 2012). "Tests begin on new drink-busting drug". Independent on Sunday. Retrieved 20 May 2012.

External links

Diagnostic radiopharmaceuticals (V09)

Central nervous system	^99mTc (Exametazime) ¹²³I (Ioflupane Iofetamine Iomazenil) ¹⁸F (Florbetapir, Flutemetamol)

Skeletal system	^99mTc (Medronic acid)

Renal	¹²³I (Sodium iodohippurate) ⁶⁴Cu (Cu-ETS2)

Hepatic/reticuloendothelial	⁷⁵Se (SeHCAT)

Respiratory system	¹³³Xe ^81mKr

Cardiovascular system	^99mTc (Sestamibi Tetrofosmin) ¹¹¹In (Imciromab) ⁸²Rb (Rubidium chloride)

Inflammation/infection	^99mTc (Exametazime Sulesomab Tilmanocept) ¹¹¹In ⁶⁷Ga

Tumor	^99mTc (Arcitumomab Votumumab Hynic-octreotide) ¹¹¹In (Capromab pendetide Satumomab pendetide) ¹²⁵I ( Minretumomab) ¹²³I/¹³¹I (Iobenguane) ¹⁸F (Fludeoxyglucose Sodium fluoride)

Adrenal cortex	¹²³I/¹²⁵I (Iodocholesterol)

Radionuclides (including tracers)	positron (PET): ¹⁸F ¹¹C ⁶⁴Cu ¹³N ¹⁵O ⁶⁸Ga gamma ray/photon (SPECT/scintigraphy): ^99mTc ¹²³I ¹²⁵I ¹³¹I ¹¹¹In ⁵⁷Co ¹⁵³Sm ¹³³Xe ⁵¹Cr ^81mKr ²⁰¹Tl ⁶⁷Ga ⁷⁵Se

GABAergics

Receptor
(ligands)

GABA_A

Agonists	(+)-Catechin Bamaluzole Barbiturates (e.g., phenobarbital) BL-1020 DAVA Dihydromuscimol GABA Gabamide GABOB Gaboxadol (THIP) Homotaurine (tramiprosate, 3-APS) Ibotenic acid iso-THAZ iso-THIP Isoguvacine Isomuscimol Isonipecotic acid Kojic amine Lignans (e.g., honokiol) Monastrol Muscimol Neuroactive steroids (e.g., allopregnanolone) Org 20599 Phenibut Picamilon P4S Progabide Propofol Quisqualamine SL-75102 TACA TAMP Terpenoids (e.g., borneol) Thiomuscimol Tolgabide ZAPA

PAMs	(Abridged; see here for a full list): α-EMTBL Alcohols (e.g., ethanol) Anabolic steroids Avermectins (e.g., ivermectin) Barbiturates (e.g., phenobarbital) Benzodiazepines (e.g., diazepam) Bromide compounds (e.g., potassium bromide) Carbamates (e.g., meprobamate) Carbamazepine Chloralose Chlormezanone Clomethiazole Dihydroergolines (e.g., ergoloid (dihydroergotoxine)) Etazepine Etifoxine Fenamates (e.g., mefenamic acid) Flavonoids (e.g., apigenin, hispidulin) Fluoxetine Flupirtine Imidazoles (e.g., etomidate) Kava constituents (e.g., kavain) Lanthanum Loreclezole Monastrol Neuroactive steroids (e.g., allopregnanolone, cholesterol) Niacin Nicotinamide (niacinamide) Nonbenzodiazepines (e.g., β-carbolines (e.g., abecarnil), cyclopyrrolones (e.g., zopiclone), imidazopyridines (e.g., zolpidem), pyrazolopyrimidines (e.g., zaleplon)) Norfluoxetine Petrichloral Phenols (e.g., propofol) Phenytoin Piperidinediones (e.g., glutethimide) Propanidid Pyrazolopyridines (e.g., etazolate) Quinazolinones (e.g., methaqualone) Retigabine (ezogabine) ROD-188 Skullcap constituents (e.g., baicalin) Stiripentol Sulfonylalkanes (e.g., sulfonmethane (sulfonal)) Topiramate Valerian constituents (e.g., valerenic acid) Volatiles/gases (e.g., chloral hydrate, chloroform, diethyl ether, paraldehyde, sevoflurane)

Antagonists	Bicuculline Coriamyrtin Dihydrosecurinine Gabazine (SR-95531) Hydrastine Hyenachin (mellitoxin) PHP-501 Pitrazepin Securinine Sinomenine SR-42641 SR-95103 Thiocolchicoside Tutin

NAMs	1,3M1B 3M2B 17-Phenylandrostenol α5IA (LS-193,268) β-CCB β-CCE β-CCM β-CCP β-EMGBL Anabolic steroids Amiloride Anisatin β-Lactams (e.g., penicillins, cephalosporins, carbapenems) Basmisanil Bemegride Bilobalide CHEB Cicutoxin Cloflubicyne Cyclothiazide DHEA DHEA-S Dieldrin (+)-DMBB DMCM DMPC EBOB Etbicyphat FG-7142 (ZK-31906) Fiproles (e.g., fipronil) Flavonoids (e.g., amentoflavone, oroxylin A) Flumazenil Fluoroquinolones (e.g., ciprofloxacin) Flurothyl Furosemide Iomazenil (¹²³I) Isoallopregnanolone Isopregnanolone (sepranolone) L-655,708 Laudanosine Leptazol Lindane MaxiPost Morphine Morphine-3-glucuronide MRK-016 Naloxone Naltrexone Nicardipine Non-steroidal antiandrogens (e.g., apalutamide, bicalutamide, enzalutamide, flutamide, nilutamide) Oenanthotoxin Pentetrazol (metrazol) Phenylsilatrane Picrotoxin (i.e., picrotin and picrotoxinin) Pregnenolone sulfate Propybicyphat PWZ-029 Radequinil Ro 15-4513 Ro 19-4603 RO4882224 RO4938581 Sarmazenil SCS Suritozole TB-21007 TBOB TBPS TCS-1105 Terbequinil TETS Thujone U-93631 Zinc ZK-93426

GABA_A-ρ

Agonists	BL-1020 CACA CAMP Homohypotaurine GABA GABOB Ibotenic acid Isoguvacine Muscimol N⁴-Chloroacetylcytosine arabinoside Picamilon Progabide TACA TAMP Thiomuscimol Tolgabide

PAMs	Allopregnanolone Alphaxolone ATHDOC Lanthanides

Antagonists	(S)-2-MeGABA (S)-4-ACPBPA (S)-4-ACPCA 2-MeTACA 3-APMPA 4-ACPAM 4-GBA cis-3-ACPBPA CGP-36742 (SGS-742) DAVA Gabazine (SR-95531) Gaboxadol (THIP) I4AA Isonipecotic acid Loreclezole P4MPA P4S SKF-97541 SR-95318 SR-95813 TPMPA trans-3-ACPBPA ZAPA

NAMs	5α-Dihydroprogesterone Bilobalide Loreclezole Picrotoxin (picrotin, picrotoxinin) Pregnanolone ROD-188 THDOC Zinc

GABA_B

Agonists	1,4-Butanediol Aceburic acid Arbaclofen Arbaclofen placarbil Baclofen BL-1020 GABA Gabamide GABOB GBL GHB GHBAL GHV GVL Isovaline Lesogaberan Phenibut Picamilon Progabide Sodium oxybate SKF-97,541 SL 75102 Tolgabide Tolibut

Antagonists	2-Hydroxysaclofen CGP-35348 CGP-46381 CGP-52432 CGP-54626 CGP-55845 CGP-64213 DAVA Homotaurine (tramiprosate, 3-APS) Phaclofen Saclofen SCH-50911 SKF-97541

NAMs	Compound 14

PAMs	ADX-71441 BHF-177 BHFF BSPP CGP-7930 CGP-13501 GS-39783 rac-BHFF

Transporter
(blockers)

GAT	4-Aminovaleric acid β-Alanine Arecaidine CI-966 DABA Deramciclane (EGIS-3886, EGYT-3886) EF-1502 Gabaculine Guvacine Ibotenic acid Muscimol Nipecotic acid NNC 05-2090 NO-711 Riluzole SKF-89976A SNAP-5114 TACA Tiagabine

VIAAT	β-Alanine Bafilomycin A1 Chicago sky blue 6B Evans blue GABA Glycine N-Butyric acid Nigericin Nipecotic acid Valinomycin Vigabatrin

Enzyme
(inhibitors)

GAD	3-Mercaptopropionic acid AAOA L-Allylglycine Semicarbazide

GABA-T	3-Hydrazinopropionic acid γ-Acetylenic-GABA AOAA EOS Gabaculine Isoniazid L-Cycloserine Phenelzine PEH Rosmarinic acid (lemon balm) Sodium valproate Valnoctamide Valproate pivoxil Valproate semisodium (divalproex sodium) Valproic acid Valpromide Vigabatrin

Others

Precursors	1,4-Butanediol GHB GHBAL Glutamate Glutamine

Analogues	Pregabalin 4-Methylpregabalin Atagabalin Gabapentin Gabapentin enacarbil Imagabalin Mirogabalin PD-200,347 PD-217,014 PD-299,685 Phenibut

Others	Vitamin B₆ GABA-T activators: 3-Methyl-GABA

See also: GHBergics • Glutamatergics • Glycinergics

Benzodiazepines

1,4-Benzodiazepines	2-Oxoquazepam 3-Hydroxyphenazepam Bromazepam Camazepam Carburazepam Chlordiazepoxide Cinazepam Cinolazepam Clonazepam Clorazepate Cyprazepam Delorazepam Demoxepam Desmethylflunitrazepam Devazepide* Diazepam Diclazepam Doxefazepam Elfazepam Ethyl carfluzepate Ethyl dirazepate Ethyl loflazepate Flubromazepam Fletazepam Fludiazepam Flunitrazepam Flurazepam Flutemazepam Flutoprazepam Fosazepam Gidazepam Halazepam Iclazepam Irazepine Kenazepine Ketazolam Lorazepam Lormetazepam Lufuradom* Meclonazepam Medazepam Menitrazepam Metaclazepam Motrazepam N-Desalkylflurazepam Nifoxipam Nimetazepam Nitrazepam Nitrazepate Nordazepam Nortetrazepam Oxazepam Phenazepam Pinazepam Pivoxazepam Prazepam Proflazepam Quazepam QH-II-66 Reclazepam RO4491533* Ro5-4864* Sulazepam Temazepam Tetrazepam Tifluadom* Tolufazepam Triflunordazepam Tuclazepam Uldazepam

1,5-Benzodiazepines	Arfendazam Clobazam CP-1414S Lofendazam Triflubazam

2,3-Benzodiazepines*	Girisopam GYKI-52466 GYKI-52895 Nerisopam Talampanel Tofisopam

Triazolobenzodiazepines	Adinazolam Alprazolam Clonazolam Estazolam Flubromazolam Nitrazolam Pyrazolam Triazolam

Imidazobenzodiazepines	Bretazenil Climazolam EVT-201 FG-8205 Flumazenil Imidazenil ¹²³I-Iomazenil L-655,708 Loprazolam Midazolam PWZ-029 Remimazolam Ro15-4513 Ro48-6791 Ro48-8684 Ro4938581 Sarmazenil SH-053-R-CH3-2′F

Oxazolobenzodiazepines	Cloxazolam Flutazolam Haloxazolam Mexazolam Oxazolam

Thienodiazepines	Bentazepam Clotiazepam

Thienotriazolodiazepines	Brotizolam Ciclotizolam Deschloroetizolam Etizolam Israpafant* JQ1* Metizolam

Thienobenzodiazepines*	Olanzapine Telenzepine

Pyridodiazepines	Lopirazepam

Pyridotriazolodiazepines	Zapizolam

Pyrazolodiazepines	Razobazam* Ripazepam Zolazepam Zomebazam Zometapine*

Pyrrolodiazepines	Premazepam

Tetrahydroisoquinobenzodiazepines	Clazolam

Pyrrolobenzodiazepines*	Anthramycin

Benzodiazepine prodrugs	Avizafone Rilmazafone

* atypical activity profile (not GABA_A receptor ligands)

This article is issued from Wikipedia - version of the 11/2/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.