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Male Wistar rats (250 to 300 g) were used. HU-210 was provided by R. Mechoulam (Hebrew University of Jerusalem). SR 141716A was obtained through SANOFI Recherche (Montpellier, France). Both drugs were prepared in a vehicle solution of saline, propylene glycol, and Tween 80 (90:5:5). Doses were selected on the basis of full dose-response studies (6, 12). Drugs were administered intraperitoneally in a volume of 1 ml per kilogram of body weight. Animals assigned to the cannabinoid withdrawal condition received daily injections of HU-210 (100 μg/kg) for 14 days.
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Intracranial microdialysis for CRF was performed as described (10). Fractions of the perfusate were collected at 20-min intervals in polyethylene tubes on ice. Five fractions were collected for determination of basal CRF efflux. Animals were then injected with either HU-210 (100 μg/kg), SR 141716A (3 mg/kg), or vehicle. Rats that had been pretreated with HU-210 (100 μg/kg) for 14 days (the "cannabinoid withdrawal" group) received either SR 141716A (3 mg/ kg) or vehicle. Sampling continued for six to eight fractions after drug treatments were terminated, at which time the microdialysis probes were perfused for 60 min with artificial cerebrospinal fluid containing the depolarizing agent 4-aminopyridine (5 mM) (4-AP, Sigma) to confirm the neurogenic origin of CRF. At the end of each experiment, rats were injected with a lethal dose of pentobarbital; their brains were perfused and fixed in 4% paraformaldehyde and then frozen, sectioned, and stained with cresyl violet.
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1,29 = 11.75, P < 0.002 compared with basal concentrations) except after single treatments with HU-210 or SR 141716A. Means ± SEM of basal CRF concentrations versus CRF concentrations after treatment with 4-AP (fmol of CRF-IR per 50 μl) were as follows: 0.99 ± 0.22 versus 2.32 ± 0.9 (vehicle); 1.2 ± 0.29 versus 1.57 ± 0.45 (HU-210); 1.07 ± 0.19 versus 1.75 ± 0.56 (SR 141716A); 0.85 ± 0.2 versus 1.51 ± 0.21 (long-term HU-210); and 0.69 ± 0.12 versus 1.30 ± 0.19 (SR 141716A after long-term HU-210).
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Plasma corticosterone concentration was monitored in separate groups of rats that were exposed to the same treatment as the animals in the microdialysis experiments. Rats were decapitated 3 hours after treatment. Corticosterone was measured by radioimmunoassay (8) with a specific antibody from Bio Clin (Cardiff, England). The detection limit was 62 pg/ml
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M. D. Hayward, R. S. Duman, E. J. Nestler, Brain Res. 525, 256 (1990); R. L. Stometta, F. E. Norton, P. G. Guyenet, ibid. 624, 19 (1993); A. M. Beckmann, I. Matsumoto, P. A. Wilce, Neuropharmacology 34, 1183 (1995).
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Hayward, M.D.1
Duman, R.S.2
Nestler, E.J.3
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48
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0027242098
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M. D. Hayward, R. S. Duman, E. J. Nestler, Brain Res. 525, 256 (1990); R. L. Stometta, F. E. Norton, P. G. Guyenet, ibid. 624, 19 (1993); A. M. Beckmann, I. Matsumoto, P. A. Wilce, Neuropharmacology 34, 1183 (1995).
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Stometta, R.L.1
Norton, F.E.2
Guyenet, P.G.3
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49
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0029162230
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M. D. Hayward, R. S. Duman, E. J. Nestler, Brain Res. 525, 256 (1990); R. L. Stometta, F. E. Norton, P. G. Guyenet, ibid. 624, 19 (1993); A. M. Beckmann, I. Matsumoto, P. A. Wilce, Neuropharmacology 34, 1183 (1995).
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(1995)
Neuropharmacology
, vol.34
, pp. 1183
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Beckmann, A.M.1
Matsumoto, I.2
Wilce, P.A.3
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50
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1842269853
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1,32 = 3.08, 0.05 < P < 0.1]
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1,32 = 3.08, 0.05 < P < 0.1].
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51
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1842283503
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note
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In the defensive withdrawal test, a single dose of HU-210 in drug-naïve rats also produced an anxiety-like effect. An important factor in the subjective reaction to cannabinoids is dosage (1). Low doses of HU-210 abolish the behavioral response to novelty and inhibit the HPA stress response, whereas higher doses, particularly under conditions of novelty, have the opposite effect (12), as in the test described here. Comparative analysis of the patterns of Fos expression in the withdrawal and short-term HU-210 treatment conditions demonstrated an overlap as well as a dissociation of affected brain regions (Table 2), implicating the involvement of different neural substrates in the anxiety-like response induced by a single high dose of cannabinoid as opposed to withdrawal from long-term cannabinoid exposure. In the central amygdala, Fos expression appeared dispersed after a single injection of HU-210, whereas after antagonist-induced withdrawal Fos-positive nuclei were densely distributed (Fig. 2). In the BNST, immunopositive cells were found in a more medial-anterior gradient during cannabinoid withdrawal, whereas Fos activation was more prominent in the lateral dorsal region after short-term cannabinoid exposure (Table 2). In the hypothalamus, the PVN exhibited less Fos immunoreactivity during cannabinoid withdrawal compared with the effects of a single treatment with cannabinoid agonist. Thus, HPA activation after a single exposure to HU-210 in drug-naïve rats appears to be mediated directly by the PVN, whereas the increase in plasma corticosterone concentrations during withdrawal may involve activation of the central amygdala, transmitted to the PVN through its direct connections or by the BNST, which, in turn, may also activate the PVN. Because both the central amygdala and PVN are thought to be involved in anxiety-like behavioral responses to stress (13, 14), these observations suggest that the balance between the contributions of both structures after acute cannabinoid treatment or antagonist-induced withdrawal may result in the particular behavioral reactivity to the novelty condition in the defensive withdrawal test.
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55
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25344451241
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data not shown
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F. Rodríguez de Fonseca, M. R. A. Carrera, M. Navarro, G. F. Koob, F. Weiss, data not shown.
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Rodríguez De Fonseca, F.1
Carrera, M.R.A.2
Navarro, M.3
Koob, G.F.4
Weiss, F.5
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56
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1842382494
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note
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Supported by National Institute on Drug Abuse grant DA 08426 (F.W.); National Institute of Diabetes, Digestive and Kidney Diseases grant DK 26741 (G.F.K. and M.R.A.C.); and Comisión Interministerial de Ciencia y Tecnología grant SAF 94/0465, multidisciplinary grant PR218/94-5670, and Comunidad Autónoma de Madrid grant CAM-AE00340/95 (M.N. and F.R.d.F.). F.R.d.F. is a research fellow of the Fundación Jaime del Amo, Universidad Complutense de Madrid. We thank M. Wilson for providing facilities and help with Fos immunohistochemistry, R. Mechoulam for HU-210, M. A. Villanúa and R. M. Muñoz for measuring corticosterone, Y. Martin for assistance with behavioral procedures, and R. Schroeder for technical assistance with the CRF radioimmunoassay.
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