The neurotrophic factor pleiotrophin modulates amphetamine-seeking behaviour and amphetamine-induced neurotoxic effects: evidence from pleiotrophin knockout mice
| Autor: | Thomas F. Deuel, María José Polanco, Pablo Perez-Pinera, Alessia Putelli, Gonzalo Herradón, Esther Gramage, Carmen González-Martín, Luis F. Alguacil, Laura Ezquerra |
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| Rok vydání: | 2010 |
| Předmět: |
Pharmacology
medicine.medical_specialty Chemistry Medicine (miscellaneous) Striatum Methamphetamine Nucleus accumbens Pleiotrophin Conditioned place preference Psychiatry and Mental health Endocrinology Neurotrophic factors Internal medicine Knockout mouse medicine Amphetamine Neuroscience medicine.drug |
| Zdroj: | Addiction Biology. 15:403-412 |
| ISSN: | 1355-6215 |
| DOI: | 10.1111/j.1369-1600.2009.00202.x |
| Popis: | Pleiotrophin (PTN), a neurotrophic factor with important roles in survival and differentiation of dopaminergic neurons, is up-regulated in the nucleus accumbens after amphetamine administration suggesting that PTN could modulate amphetamine-induced pharmacological or neuroadaptative effects. To test this hypothesis, we have studied the effects of amphetamine administration in PTN genetically deficient (PTN ―/―) and wild type (WT, +/+) mice. In conditioning studies, we found that amphetamine induces conditioned place preference in both PTN ―/―) and WT (+/+) mice. When these mice were re-evaluated after a 5-day period without amphetamine administration, we found that WT (+/+) mice did not exhibit amphetamine-seeking behaviour, whereas, PTN ―/― mice still showed a robust drug-seeking behaviour. In immunohystochemistry studies, we found that amphetamine (10 mg/kg, four times, every 2 hours) causes a significant increase of glial fibrillary acidic protein positive cells in the striatum of amphetamine-treated PTN ―/― mice compared with WT mice 4 days after last administration of the drug, suggesting an enhanced amphetamine-induced astrocytosis in the absence of endogenous PTN. Interestingly we found in concomitant in vitro studies that PTN (3 μM) limits amphetamine (1 mM)-induced loss of viability of PC 12 cell cultures, effect that could be related to the ability of PTN to induce the phosphorylation of Akt and ERK1/2. To test this possibility, we used specific Akt and ERK1/2 inhibitors uncovering for the first time that PTN-induced protective effects against amphetamine-induced toxicity in PC12 cells are mediated by the ERK1/2 signalling pathway. The data suggest an important role of PTN to limit amphetamine-induced neurotoxic and rewarding effects. |
| Databáze: | OpenAIRE |
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