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5-HT2C receptor-mediated phosphoinositide turnover and the stimulus effects of m-chlorophenylpiperazine.
Psychopharmacology (Berl). 1995 Dec; 122(3):237-43.P

Abstract

The present study was designed to investigate the hypothesis that agonist interactions at 5-HT2C receptors mediate the discriminative stimulus properties of m-chlorophenylpiperazine (mCPP). Three structural classes of compounds have been described to stimulate increases in phosphoinositide (PI) hydrolysis at the 5-HT2C receptor site: phenylpiperazines, phenylalkylamines, and indolamines. Four representative phenylpiperazines, mCPP, TFMPP, MK-212 and quipazine, one phenylalkylamine, (-)DOM, and one indolamine, LSD, were employed in the present study. The efficacies of these compounds were defined (1) in vitro, with respect to their abilities to stimulate increases in PI hydrolysis in the choroid plexus, and (2) in vivo with respect to their abilities to substitute for the mCPP discriminative stimulus. In vitro intrinsic activity at the 5-HT2C site was expressed as a fraction of the maximal PI hydrolysis response elicited by serotonin (5-HT). MK-212 (fractional efficacy = 1.1) and (-)DOM (0.77) were full agonists, while mCPP (0.72), LSD (0.27), quipazine (0.24), and TFMPP (0.22) were partial agonists with respect to the stimulation of PI hydrolysis at the 5-HT2C receptor. In vivo, each of the phenylpiperazines fully substituted for the mCPP stimulus, while (-)DOM (75%), and LSD (67%) elicited only partial substitution. While compounds with agonist activity at the 5-HT2C receptor in vitro substitute for the mCPP stimulus in vivo, no clear relationship exists between in vitro intrinsic activity at the 5-HT2C receptor with respect to the stimulation of PI turnover and maximal substitution for the mCPP stimulus in vivo. The present data suggest that mCPP elicits a compound stimulus which is mediated by agonist interactions at the 5-HT2C receptor and possibly additional interactions with 5-HT2A, 5-HT3, and/or 5-HT1B receptors.

Authors+Show Affiliations

Fiorella D
Department of Pharmacology and Toxicology, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, USA.
Helsley S
No affiliation info available
Rabin RA
No affiliation info available
Winter JC
No affiliation info available

MeSH

2,5-Dimethoxy-4-MethylamphetamineAnimalsChoroid PlexusConditioning, OperantDrug InteractionsKetanserinLysergic Acid DiethylamideOndansetronPhosphatidylinositolsPiperazinesPyrazinesQuipazineRatsReceptors, SerotoninSerotonin AntagonistsSerotonin Receptor Agonists

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

8748393

Citation

Fiorella, D, et al. "5-HT2C Receptor-mediated Phosphoinositide Turnover and the Stimulus Effects of M-chlorophenylpiperazine." Psychopharmacology, vol. 122, no. 3, 1995, pp. 237-43.
Fiorella D, Helsley S, Rabin RA, et al. 5-HT2C receptor-mediated phosphoinositide turnover and the stimulus effects of m-chlorophenylpiperazine. Psychopharmacology (Berl). 1995;122(3):237-43.
Fiorella, D., Helsley, S., Rabin, R. A., & Winter, J. C. (1995). 5-HT2C receptor-mediated phosphoinositide turnover and the stimulus effects of m-chlorophenylpiperazine. Psychopharmacology, 122(3), 237-43.
Fiorella D, et al. 5-HT2C Receptor-mediated Phosphoinositide Turnover and the Stimulus Effects of M-chlorophenylpiperazine. Psychopharmacology (Berl). 1995;122(3):237-43. PubMed PMID: 8748393.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - 5-HT2C receptor-mediated phosphoinositide turnover and the stimulus effects of m-chlorophenylpiperazine. AU - Fiorella,D, AU - Helsley,S, AU - Rabin,R A, AU - Winter,J C, PY - 1995/12/1/pubmed PY - 1995/12/1/medline PY - 1995/12/1/entrez SP - 237 EP - 43 JF - Psychopharmacology JO - Psychopharmacology (Berl) VL - 122 IS - 3 N2 - The present study was designed to investigate the hypothesis that agonist interactions at 5-HT2C receptors mediate the discriminative stimulus properties of m-chlorophenylpiperazine (mCPP). Three structural classes of compounds have been described to stimulate increases in phosphoinositide (PI) hydrolysis at the 5-HT2C receptor site: phenylpiperazines, phenylalkylamines, and indolamines. Four representative phenylpiperazines, mCPP, TFMPP, MK-212 and quipazine, one phenylalkylamine, (-)DOM, and one indolamine, LSD, were employed in the present study. The efficacies of these compounds were defined (1) in vitro, with respect to their abilities to stimulate increases in PI hydrolysis in the choroid plexus, and (2) in vivo with respect to their abilities to substitute for the mCPP discriminative stimulus. In vitro intrinsic activity at the 5-HT2C site was expressed as a fraction of the maximal PI hydrolysis response elicited by serotonin (5-HT). MK-212 (fractional efficacy = 1.1) and (-)DOM (0.77) were full agonists, while mCPP (0.72), LSD (0.27), quipazine (0.24), and TFMPP (0.22) were partial agonists with respect to the stimulation of PI hydrolysis at the 5-HT2C receptor. In vivo, each of the phenylpiperazines fully substituted for the mCPP stimulus, while (-)DOM (75%), and LSD (67%) elicited only partial substitution. While compounds with agonist activity at the 5-HT2C receptor in vitro substitute for the mCPP stimulus in vivo, no clear relationship exists between in vitro intrinsic activity at the 5-HT2C receptor with respect to the stimulation of PI turnover and maximal substitution for the mCPP stimulus in vivo. The present data suggest that mCPP elicits a compound stimulus which is mediated by agonist interactions at the 5-HT2C receptor and possibly additional interactions with 5-HT2A, 5-HT3, and/or 5-HT1B receptors. SN - 0033-3158 UR - https://www.unboundmedicine.com/medline/citation/8748393/5_HT2C_receptor_mediated_phosphoinositide_turnover_and_the_stimulus_effects_of_m_chlorophenylpiperazine_ L2 - https://antibodies.cancer.gov/detail/CPTC-GSTP1-1 DB - PRIME DP - Unbound Medicine ER -