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Integrin-Linked Kinase Is Involved in Cocaine Sensitization by Regulating PSD-95 and Synapsin I Expression and GluR1 Ser845 Phosphorylation

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Abstract

Our recent studies have demonstrated that integrin-linked kinase (ILK) is involved in the induction and maintenance of cocaine behavioral sensitization and chronic cocaine-induced neural plasticity in the nucleus accumbens (NAc) core. In the present study, we used ILK silencing to investigate how ILK may influence cocaine-induced neural plasticity. Adeno-associated virus carrying a small interfering RNA-ILK cassette under the control of an inducible Tet-On system was injected into the NAc core of Sprague–Dawley rats. Induced silencing was established during repeated cocaine injections (sensitization induction period) or between withdrawal days 9 and 22 (sensitization maintenance period). Under both paradigms, established cocaine sensitization under non-silenced conditions was associated with enhanced PSD-95 and synapsin I protein expression as well as enhanced Ser845 phosphorylation of the GluR1 subunit on withdrawal day. Silencing ILK expression under both paradigms prevented or reversed these changes. Importantly, ILK appears to form a complex with PSD-95 and synapsin I because it co-immunoprecipitated with each of these proteins. Together, these data suggest that ILK exerts pleiotropic actions by regulating pre- and postsynaptic neural plasticities within the NAc core in response to repeated cocaine exposure.

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Acknowledgment

This study was supported by grants from the National Institute of Drug Abuse (by DA021185 to XZ and DA12768 to THL).

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Authors and Affiliations

  1. Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Box 3870, Durham, NC, 27710, USA

    Qiang Chen, Yu Zhang, William C. Wetsel, Tong H. Lee & Xiuwu Zhang

  2. Medical Psychological Research Center, Second XiangYa Hospital, Central South University, Changsha, Hunan, 410011, China

    Xiongzhao Zhu

  3. Department of Neurobiology, Duke University Medical Center, Durham, NC, 27710, USA

    William C. Wetsel

  4. Department of Cell Biology, Duke University Medical Center, Durham, NC, 27710, USA

    William C. Wetsel

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  1. Qiang Chen
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  2. Xiongzhao Zhu
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  5. Tong H. Lee
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Correspondence to Xiuwu Zhang.

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Chen, Q., Zhu, X., Zhang, Y. et al. Integrin-Linked Kinase Is Involved in Cocaine Sensitization by Regulating PSD-95 and Synapsin I Expression and GluR1 Ser845 Phosphorylation. J Mol Neurosci 40, 284–294 (2010). https://doi.org/10.1007/s12031-009-9218-3

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