Trimipramine maleate

Trimipramine maleate is a 5-HT receptor antagonist, with pKis of 6.39, 8.10, 4.66 for 5-HT1C, 5-HT2 and 5-HT1A, respectively.

Signaling Pathways >> GPCR/G Protein >> 5-HT Receptor

Signaling Pathways >> Neuronal Signaling >> 5-HT Receptor

Research Areas >> Neurological Disease

5-HT1C Receptor:6.39 (pKi)

5-HT2 Receptor:8.10 (pKi)

5-HT1A Receptor:4.66 (pKi)

Trimipramine displays much higher affinity for 5-HT2 than for 5-HT1C receptors[1].

The chronic administration of Trimipramine (5 mg/kg/day), as delivered by the osmotic minipump in 14 days produce significant increases in the regional concentration of 5-HT. The increases are highest in the frontal cortex and the hippocampus, followed by the olfactory tubercles and the hypothalamus. The Trimipramine treatment also produces marked increases in brain 5-HIAA concentrations ranging from 63% in the hippocampus to 25% in the nucleus accumbens with intermediate values for the hypothalamus, olfactory tubercles, frontal cortex and nucleus accumbens. Trimipramine treatment produces significant increases in DA concentrations in the nucleus accumbens, striaturn, and olfactory tubercles reaching 43, 21 and 11% respectively. Chronic administration of Trimipramine produces a marked reduction in the number of frontal cortex 5-HT2 and striatal DA D2 receptors. The chronic administration of Trimipramine produces an increase in the brain regional level of monoamines and metabolites indicating a greater synthesis rate for DA and 5-HT coinciding with an adaptive down regulation of 5-HT2 and DA D2 receptors[2].

Rats[2] Male Wistar rats weighing 220-250 g at the beginning of the experiment are used. The animals, housed in groups of 6-8 have free access to food and water and are kept on a 12 hr light/dark cycle (light on at 6a.m.) at a temperature. The rats are anaesthetized with pentobarbital (50 mg/kg i.p.) and an osmotic minipump is implanted subcutaneously in the dorsal thoracic interscapular region. Each pump delivers 5 mg/kg/day of Trimipramine or amitriptyline. Control rats are implanted with pumps filled with 0.9%, saline. The total volume of solution in the pump is sufficient for at least 14 days delivery of drugs. After implantation, the incision is cleaned and sutured and the animals kept warm until they recovered from anaesthesia[2].

[1]. Jenck F, et al. Evidence for a role of 5-HT1C receptors in the antiserotonergic properties of some antidepressant drugs. Eur J Pharmacol. 1993 Feb 9;231(2):223-9.

[2]. Juorio AV, et al. The effects of chronic trimipramine treatment on biogenic amine metabolism and on dopamine D2, 5-HT2 and tryptamine binding sites in rat brain. Gen Pharmacol. 1990;21(5):759-62.

Harmine | Pimavanserin | Serotonin hydrochloride | Sodium Ferulate | Thioridazine hydrochloride | Brexpiprazole | Risperidone | TG6-10-1 | Cariprazine | Quetiapine | SERTINDOLE | Alprenolol hydrochloride | B-HT 920 | Ketanserin | Palonosetron hydrochloride

MOLECULAR WEIGHT :

410.56

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :

LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :

Oral

SPECIES OBSERVED :

Rodent - rat

DOSE/DURATION :

800 mg/kg

TOXIC EFFECTS :

Details of toxic effects not reported other than lethal dose value

REFERENCE :

FRPPAO Farmaco, Edizione Pratica. (Casella Postale 227, 27100 Pavia, Italy) V.8-43 1953-88 For publisher information, see FRMCE8 Volume(issue)/page/year: 25,519,1970

TYPE OF TEST :

LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :

Intraperitoneal

SPECIES OBSERVED :

Rodent - rat

DOSE/DURATION :

150 mg/kg

TOXIC EFFECTS :

Details of toxic effects not reported other than lethal dose value

REFERENCE :

FRPPAO Farmaco, Edizione Pratica. (Casella Postale 227, 27100 Pavia, Italy) V.8-43 1953-88 For publisher information, see FRMCE8 Volume(issue)/page/year: 25,519,1970

TYPE OF TEST :

LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :

Subcutaneous

SPECIES OBSERVED :

Rodent - rat

DOSE/DURATION :

308 mg/kg

TOXIC EFFECTS :

Details of toxic effects not reported other than lethal dose value

REFERENCE :

FRPPAO Farmaco, Edizione Pratica. (Casella Postale 227, 27100 Pavia, Italy) V.8-43 1953-88 For publisher information, see FRMCE8 Volume(issue)/page/year: 25,519,1970

TYPE OF TEST :

LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :

Intravenous

SPECIES OBSERVED :

Rodent - rat

DOSE/DURATION :

38 mg/kg

TOXIC EFFECTS :

Details of toxic effects not reported other than lethal dose value

REFERENCE :

FRPPAO Farmaco, Edizione Pratica. (Casella Postale 227, 27100 Pavia, Italy) V.8-43 1953-88 For publisher information, see FRMCE8 Volume(issue)/page/year: 25,519,1970

TYPE OF TEST :

LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :

Oral

SPECIES OBSERVED :

Rodent - mouse

DOSE/DURATION :

425 mg/kg

TOXIC EFFECTS :

Details of toxic effects not reported other than lethal dose value

REFERENCE :

NIIRDN Drugs in Japan (Ethical Drugs). (Yakugyo Jiho Co., Ltd., Tokyo, Japan) Volume(issue)/page/year: 6,526,1982

TYPE OF TEST :

LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :

Intraperitoneal

SPECIES OBSERVED :

Rodent - mouse

DOSE/DURATION :

140 mg/kg

TOXIC EFFECTS :

Details of toxic effects not reported other than lethal dose value

REFERENCE :

FRPPAO Farmaco, Edizione Pratica. (Casella Postale 227, 27100 Pavia, Italy) V.8-43 1953-88 For publisher information, see FRMCE8 Volume(issue)/page/year: 25,519,1970

TYPE OF TEST :

LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :

Subcutaneous

SPECIES OBSERVED :

Rodent - mouse

DOSE/DURATION :

240 mg/kg

TOXIC EFFECTS :

Details of toxic effects not reported other than lethal dose value

REFERENCE :

FRPPAO Farmaco, Edizione Pratica. (Casella Postale 227, 27100 Pavia, Italy) V.8-43 1953-88 For publisher information, see FRMCE8 Volume(issue)/page/year: 25,519,1970

TYPE OF TEST :

LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :

Intravenous

SPECIES OBSERVED :

Rodent - mouse

DOSE/DURATION :

40 mg/kg

TOXIC EFFECTS :

Details of toxic effects not reported other than lethal dose value

REFERENCE :

FRPPAO Farmaco, Edizione Pratica. (Casella Postale 227, 27100 Pavia, Italy) V.8-43 1953-88 For publisher information, see FRMCE8 Volume(issue)/page/year: 25,519,1970

TYPE OF TEST :

LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :

Intramuscular

SPECIES OBSERVED :

Rodent - mouse

DOSE/DURATION :

223 mg/kg

TOXIC EFFECTS :

Details of toxic effects not reported other than lethal dose value

REFERENCE :

NIIRDN Drugs in Japan (Ethical Drugs). (Yakugyo Jiho Co., Ltd., Tokyo, Japan) Volume(issue)/page/year: -,876,1995

TYPE OF TEST :

LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :

Intravenous

SPECIES OBSERVED :

Rodent - rabbit

DOSE/DURATION :

27 mg/kg

TOXIC EFFECTS :

Behavioral - convulsions or effect on seizure threshold Lungs, Thorax, or Respiration - respiratory depression Nutritional and Gross Metabolic - body temperature decrease

REFERENCE :

BJPCAL British Journal of Pharmacology and Chemotherapy. (London, UK) V.1-33, 1946-68. For publisher information, see BJPCBM. Volume(issue)/page/year: 25,158,1965 ** REPRODUCTIVE DATA **

TYPE OF TEST :

TDLo - Lowest published toxic dose

ROUTE OF EXPOSURE :

Subcutaneous

DOSE :

85 mg/kg

SEX/DURATION :

female 9 day(s) after conception

TOXIC EFFECTS :

Reproductive - Effects on Embryo or Fetus - fetal death Reproductive - Effects on Embryo or Fetus - fetotoxicity (except death, e.g., stunted fetus) Reproductive - Specific Developmental Abnormalities - Central Nervous System

REFERENCE :

DGDFA5 Development, Growth & Differentiation. (Japan Pub. Trading Co. (USA), 1255 Howard St., San Francisco, CA 94103) V.11- 1969- Volume(issue)/page/year: 22,61,1980