Abstract
Rationale and objectives
Many pathological and physiological processes are associated with the transcriptional induction of specific receptors. The aim of the present study was to examine whether the development of d-amphetamine (AMPH)-induced sensitisation is related to an altered P2Y1 receptor expression.
Methods
Rats, treated for 5 successive days with AMPH (1.5 mg/kg, i.p.), alone or after pre-treatment with the non-specific P2 receptor antagonist pyridoxal-phosphate-6-azophenyl-2,4-disulphonic acid (PPADS, 0.6 nmol, i.c.v.) and tested in an open field system with respect to locomotor response, were studied immunocytochemically 5 days after the last AMPH injection.
Results
In the behaviourally sensitised animals, astrogliosis, characterised by hypertrophy, increase in glial fibrillary acidic protein (GFAP) immunoreactivity (IR) and astrocytic proliferation in striatal areas and the nucleus accumbens were observed. Quantification of the P2Y1 receptor stained cells revealed an increase in the receptor expression after AMPH-induced sensitisation in the studied regions. Pre-treatment with PPADS prior to each AMPH administration prevented the development of sensitisation, astrogliosis and P2Y1 receptor up-regulation. PPADS failed to alter the number of P2Y1 receptor-labelled cells when given alone. Confocal laser scanning microscopy indicated the localisation of P2Y1 receptors on GFAP-labelled astrocytes as well as on tubulin (βIII)-labelled neurones, under control conditions and after AMPH administration.
Conclusion
The present results confirm the existence of P2Y1 receptors on astrocytes and neurones as possible targets of endogenous ATP and in addition show their up-regulation as a consequence of P2Y1 receptor-involvement in AMPH-induced sensitisation in vivo.
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Acknowledgements
The authors thank Dr. D. Moore (Department of Neurobiology, The Babraham Institute, Cambridge and SmithKline Beecham Pharmaceuticals, UK) for the P2Y1 receptor antibody. The authors are grateful to M. Henschke, M. Noack and K. Krause for technical assistance. This study was supported by the Deutsche Forschungsgemeinschaft (KI 677/2-1) and by the "Interdisciplinary Center for Clinical Research" at the University of Leipzig (01KS9504, Project Z10).
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Franke, H., Kittner, H., Grosche, J. et al. Enhanced P2Y1 receptor expression in the brain after sensitisation with d-amphetamine. Psychopharmacology 167, 187–194 (2003). https://doi.org/10.1007/s00213-002-1386-6
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DOI: https://doi.org/10.1007/s00213-002-1386-6