Volume 41, Issue 2 pp. 311-320
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Effect of Chronic Administration of Haloperidol (Intermittently) and Haloperidol-Decanoate (Continuously) on D2 Dopamine and Muscarinic Cholinergic Receptors and on Carbachol-Stimulated Phosphoinositide Hydrolysis in the Rat Striatum

Kazufumi Akiyama M.D.

Corresponding Author

Kazufumi Akiyama M.D.

Department of Neuropsychiatry, Okayama University Medical School, Okayama

Department of Neuropsychiatry, Okayama University Medical School, 2–5–1 Shikata-cho, Okayama 700, JapanSearch for more papers by this author
Mitsumoto Sato M.D.

Mitsumoto Sato M.D.

*Department of Psychiatry, Tohoku University School of Medicine, Sendai

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Norihito Yamada M.D.

Norihito Yamada M.D.

Department of Neuropsychiatry, Okayama University Medical School, Okayama

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Saburo Otsuki M.D.

Saburo Otsuki M.D.

Department of Neuropsychiatry, Okayama University Medical School, Okayama

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First published: June 1987
Citations: 1

Abstract

Abstract: It has been reported that apomorphine-induced stereotypy is sensitized after a chronic intermittent administration of haloperidol (HPD), but not after a chronic continuous exposure to haloperidol-decanoate (HPD-D). The present study was undertaken to investigate changes in the D2 dopamine and muscarinic receptors in the ratstriatum after the administration of HPD intermittently and HPD-D continuously. The number of striatal [3H] spiperone binding sites increased significantly after HPD-D, but did not change after HPD. Neither the number of [3H](–)QNB binding sites nor carbachol-stimulated phosphoinositide hydrolysis changed after either HPD or HPD-D. These results indicate that the increase in striatal D2 receptors in rats administered HPD-D represents behavioral and biochemical tolerance, and that neither the D2 dopamine receptor supersensitivity nor muscarinic receptor hyposensitivity underlies sensitization of apomorphine-induced stereotypy.

abbreviations used are:

  • InsP
  • inositol monophosphate;
  • InsP2
  • inositol biphosphate;
  • InsP3
  • inositol triphosphate;
  • HPD
  • haloperidol;
  • HPD-D
  • haloperidol-decanoate;
  • (-)QNB
  • (–) quinuclidinyl benzilate;
  • KD
  • dissociation constant;
  • Bmax
  • maximal number of binding sites.
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