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Dopaminergic Modulation of Grooming Behavior in Virgin and Pregnant Rats

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Dopaminergic Modulation of Grooming Behavior in Virgin and Pregnant Rats Brazilian Journal of Medical and Biological Research (2001) 34: 1465-1470 Grooming, dopamine receptors and pregnancy 1465 ISSN 0100-879X Dopaminergic modulation of grooming behavior in virgin and pregnant rats A.P. Serafim and Departamento de Patologia, Faculdade de Medicina Veterinária, L.F. Felicio Universidade de São Paulo, São Paulo, SP, Brasil Abstract Correspondence Dopamine receptors are involved in the expression of grooming Key words L.F. Felicio behavior. The pregnancy-induced increase in self-licking observed in · Self-licking Departamento de Patologia rats is important for mammary gland development and lactation. This · Lisuride Faculdade de Medicina Veterinária study focuses on the role of dopamine receptor subtypes in grooming · SKF-81297 Universidade de São Paulo behavior of virgin and pregnant female rats. General and mammary · SKF-83566 Av. Orlando Marques Paiva, 87 · gland grooming were measured in virgin rats treated with 0.25 mg/kg Sulpiride 05508-900 São Paulo, SP · of the D1-like agonist SKF-81297 and antagonist SKF-83566 and the Mammary gland Brasil · Prolactin D2-like agonist lisuride and antagonist sulpiride. The effects of 0.01 Fax: +55-11-3818-7829 · Dopamine E-mail: [email protected] and 0.25 mg/kg doses of the same agonists and antagonists were evaluated in pregnant rats as well. In virgin animals both SKF-83566 Research supported by FAPESP and sulpiride treatments significantly reduced the time spent in gen- (No. 96/4193-0) and CNPq eral grooming, while none of the dopamine agonists was able to (No. 520234/96) grants to L.F. Felicio. A.P. Serafim was significantly change any parameter of general grooming. Time spent the recipient of FAPESP and CNPq in grooming directed at the mammary glands was not affected signifi- fellowships. cantly by any of the drug treatments in virgin rats. All drugs tested significantly decreased the frequency of and the time spent with general grooming, while SKF-81297 treatment alone did not signifi- cantly reduce the duration of mammary gland grooming in pregnant Received May 7, 2001 rats. These data show that in female rats the behavioral effects of D1- Accepted September 4, 2001 like and D2-like dopamine receptor stimulation and blockade differ according to physiological state. The results suggest that dopamine receptors may play specific roles modulating grooming behavior in pregnant rats. Since grooming of the mammary gland during preg- nancy may influence lactation, this aspect is relevant for studies regarding the perinatal use of dopamine-related drugs. Introduction by stimulation and blockade of dopamine receptor subtypes (5,7-9), sex (10) and re- Almost all animal species spend a signifi- productive state (11). Grooming behavior is cant part of their time in grooming behavior under the influence of the endocrine milieu (1). Although various neurotransmitters can (4,12). During pregnancy female rats change modulate the expression of this behavior their grooming patterns, tending to lick their (2,3), dopamine is particularly involved (4,5). mammary glands more than prior to preg- Lesions in brain regions rich in dopaminer- nancy (11,13). This in turn has been shown gic inputs influence the implementation of to be important for mammary gland develop- grooming syntax (6). Moreover, in rodents ment and lactation (14). Researchers have grooming behavior is differently modulated shown that dopamine is involved in both the Braz J Med Biol Res 34(11) 2001 1466 A.P. Serafim and L.F. Felicio onset and maintenance of maternal care tional Research Council, USA. (15,16). There are two pharmacologically distinct dopamine receptor families, D1-like Drugs and D2-like (17). These receptors are repre- sented by at least five different proteins; D1 Drugs were the D1-like agonist SKF- and D5 are subtypes of D1-like receptors, 81297 and antagonist SKF-83566 and the while D2, D3 and D4 are subtypes of D2-like D2-like agonist lisuride and antagonist sul- receptors (18). While it is possible to differ- piride, all obtained from RBI (Natick, MA, entiate between the two dopamine receptor USA). They were diluted in saline and ad- subfamilies, the different members within ministered subcutaneusly (sc) in a volume of each subfamily cannot be distinguished by 1.0 ml/kg. pharmaceutical means. Pharmacological manipulations of the dopaminergic systems Measurements and observations during pregnancy can influence both mater- nal (15,16) and offspring behavior (19-24). Grooming behavior was videotaped dur- The aim of the present study was to investi- ing 30-min test sessions on days 7, 8 and 9 of gate the role of D1-like and D2-like dopa- pregnancy. Virgin animals were observed on mine receptor families in grooming behavior each testing day as well. To minimize pos- of virgin and pregnant rats. Our working sible circadian influences, observations of hypothesis was that in female rats the modu- animals from different groups were inter- latory role of each of these receptor families mixed; observations began at 8:00 am and in grooming behavior changes according to animals were placed in the same order every reproductive state. Since frequently small day. Each rat was videotaped under room and large doses of dopamine-related drugs light in her own cage with a glass cover. Two have different effects, pregnant rats were habituation sessions were held on the days challenged with two doses. preceding the day of the first testing session. Each pregnant animal was tested three times, Material and Methods being injected with a different dose of the drug each time. The days of each drug dose Animals were randomly assigned to each animal. Each drug dose was tested on at least six animals. At least one month before the behavioral Self-licking was recorded according to the tests, adult virgin female Wistar rats from body region to which it was confined. Head, our own colony weighing 180-220 g at the forepaws, shoulders and upper back were beginning of the experiments were individu- recorded as general grooming, while nipple ally housed in polypropylene cages (45 x 25 lines, genital and pelvic regions were con- x 20 cm) on a controlled light-dark cycle sidered as mammary gland grooming. The (lights on from 6:00 to 18:00) at a tempera- frequency and duration in seconds of each of ture of 22 ± 3ºC. Water and food were avail- these behavioral categories were recorded able ad libitum. Rats were kept virgin for during individual 30-min sessions. experiment 1 or were mated with males (ex- periment 2). The day sperm was observed in Experiment 1. Effects of stimulation and the vaginal lavage was designated day 1 of blockade of dopamine receptors on groom- pregnancy. The animals used in this study ing behavior of virgin female rats were maintained in accordance with the guidelines of the Committee on Care and Virgin rats were injected sc with saline or Use of Laboratory Animal Resources, Na- 0.25 mg/kg of SKF-81297, SKF-83566, Braz J Med Biol Res 34(11) 2001 Grooming, dopamine receptors and pregnancy 1467 lisuride or sulpiride and tested for grooming (F(2,54) = 11.3; P<0.05) and the D2-like behavior for 30 min starting 10 min after antagonist sulpiride (F(2,62) = 6.4; P<0.05) drug injection. significantly reduced the time spent in mam- mary gland grooming by pregnant rats (Fig- Experiment 2. Effects of stimulation ures 1 and 2). None of the treatments with and blockade of dopamine receptors on the D1-like agonist SKF-81297 significantly grooming behavior of pregnant female rats influenced the time spent in mammary gland grooming by pregnant rats (Figure 1). The Pregnant rats were injected sc with sa- frequency of grooming was not significantly line, 0.01 or 0.25 mg/kg of SKF-81297, SKF- affected by any drug treatment in virgin rats 83566, lisuride or sulpiride and tested for (Table 3). Both the 0.01 and 0.25 mg/kg grooming behavior for 30 min starting 10 doses of SKF-81297 (F(2,62) = 12.03; min after drug injection. Table 1. Effects of stimulation and blockade of Statistical analysis dopamine receptors on time (seconds) spent in grooming behavior by virgin rats. Statistical comparisons between two groups were made using the Student t-test General Mammary gland grooming grooming (Experiment 1). One-way analysis of vari- ance (ANOVA) followed by the Tukey- Saline (24) 58±3.7 8±2.7 Kramer test was used to compare grooming SKF-81297 (6) 50±5.8 5±2.2 behavioral data when various doses were SKF-83566 (6) 32±6.6* 9±1.7 used (Experiment 2). A probability of P<0.05 Lisuride (6) 50±5.8 7±3.1 was considered significant for all compari- Sulpiride (6) 40±6.9* 5±2.5 sons made. Animals were treated with saline or 0.25 mg/kg sc of one of the drugs and observed for 30 min for Results grooming behavior. Data are reported as means ± SEM. The number of animals is given in parenthe- Only the dopamine receptor antagonists ses. *P<0.05 compared to the saline group (Stu- dent t-test). SKF-83566 and sulpiride significantly re- duced the time spent in general grooming by virgin rats (P<0.05; Table 1), while none of Table 2. Effects of stimulation and blockade of the dopamine receptor agonists or antago- dopamine receptors on time spent in general nists significantly influenced the time spent grooming behavior by pregnant rats. in mammary grooming by virgins (Table 1). Dose (mg/kg) General grooming displayed by pregnant rats was significantly reduced by previous treat- 0.00 0.01 0.25 ment with the lower dose (0.01 mg/kg) of Saline 200±104 -- SKF-81297 (F(2,62) = 15.7; P<0.05).
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