Conditioning to Injection Procedures and Repeated Testing Increase SCH 23390-Induced Catalepsy in Mice

Abstract

The cataleptic behavior induced by the dopamine D 1 antagonist SCH 23390 (SCH) has proven to be a useful assay for investigating the sensitivity of D 1 -like dopamine receptor-mediated effects during chronic drug administration. A fundamental flaw in most of these studies may be the involvement of the "repeated measures effect," a behavioral phenomenon well demonstrated for neurolepticinduced catalepsy but not yet investigated for dopamineThe ability of chronic neuroleptic treatment to produce increasing or decreasing degrees of both Parkinsonism in humans (see Hansen and Hoffman 1997) and catalepsy in laboratory animals (Barnes et al. 1990) over time remains controversial. Specifically, concerning the evolution of catalepsy during chronic haloperidol treatment, tolerance (Asper et al. 1973;Ezrin-Waters and Seeman 1977;Campbell and Baldessarini 1981), sensitization (Antelman et al. 1986;Kinon and Kane 1989;Barnes et al. 1990), or no effects (György et al. 1969;Moller Nielsen et al. 1974;Frussa-Filho et al. 1992) have been reported. Although the patterns of change in catalepsy responses to chronic neuroleptic treatment are influenced by multiple determinants (Barnes et al. 1990), two specific biological mechanisms seem to be of particular importance in determining the development of tolerance or sensitization: dopamine receptor supersensitivity (Ezrin-Waters and Seeman 1977;Hoffman and Beninger 1988) and a learning process due to repeated testing in the catalepsy apparatus (Iwata et al. 1989;Ferré et al. 1990), respectively. In regards to the learning process, both repeated measures in a single session after acute haloperidol administration (Stanley and Glick 1976;Hillegaart et al. 1987 Received October 12, 1998; revised April 30, 1999; accepted May 17, 1999. N EUROPSYCHOPHARMACOLOGY 1999 -VOL . 21 , NO . 5 Conditioning and SCH 23390-Induced Catalepsy 671 et al. 1990) have been reported to markedly enhance the cataleptic behavior presented by rodents.For many years, dopamine D 2 -like receptors were implicated as the only site mediating the cataleptic behavior of neuroleptics (Seeman 1980). However, in 1984, Christensen et al. (1984 first reported the cataleptogenic properties of SCH 23390, a selective antagonist of D 1 -like dopamine receptors (Hyttel 1983). Thus, besides providing a functional correlate of dopamine D 1 receptor antagonism (Mizuki et al. 1996), SCH 23390-induced catalepsy has proven to be a useful assay for investigating the functional interactions between D 1 -and D 2 -like dopamine receptors (see Klemm 1993). Catalepsy has also been used to investigate the sensitivity of D 1 -like dopamine receptor-mediated effects during chronic drug administration. In two landmark investigations, Hess et al. (1986Hess et al. ( , 1988 reported that although chronic treatment of rats with SCH 23390 resulted in an increase in D 1 -like striatal dopamine receptors as well as in spontaneous locomotion and D 1 -like and D 2 -like dopamine agonist-induced stereotypy, no tolerance to the cataleptic effect ...

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