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Expression of CAPON after Spinal Cord Injury in Rats

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Abstract

The adaptor protein, carboxy-terminal PDZ ligand of nNOS (CAPON), regulates the distribution of neuronal nitric oxide synthase (nNOS) that increased after spinal cord injury (SCI) and produces the key signaling molecule nitric oxide (NO). But little is known about the role of CAPON in the pathological process of SCI. The main objective of the present study was to investigate expression of CAPON and nNOS in a spinal cord contusion model in adult rats. Real time-polymerase chain reaction (PCR) and Western blot analysis revealed that mRNA and protein for CAPON increased at 2 h after SCI and reached the peak at 8 h, gradually recovered to the baseline level at 14 days. The expression of nNOS mRNA and protein was similar to that of CAPON. During the peak expression, CAPON mRNA was found in the ventral horn, mediate zone, dorsal horn, and white matter by in situ hybridization. Immunofluorescence showed that CAPON was colocalized with nNOS in neurons, oligodendrocytes, and some astrocytes of spinal cord tissues within 5 mm from the epicenter. Interaction between CAPON and nNOS was also detected by co-immunoprecipitation. Thus, the transient expression of high levels of CAPON may provide new insight into the secondary response after SCI.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 30300099), Natural Science Foundation of Jiangsu province (No. BK2003035, No. BK2006547), and “Six Talent Peak” Foundation of Jiangsu province.

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Authors and Affiliations

  1. The Jiangsu Province Key Laboratory of Neuroregeneration, Nantong University, 19 Qi-xiu Road, Nantong, Jiangsu, 226001, China

    Chun Cheng, Xin Li, Shuqiong Niu, Zhiqin Guo & Aiguo Shen

  2. Department of Microbiology and Immunology, Nantong University (Former Nantong Medical College), Nantong, 226001, China

    Chun Cheng, Xin Li, Shangfeng Gao, Mengling Chen & Jing Qin

  3. Department of Orthopaedics, Affiliated Hospital of Nantong University, Nantong, 226001, China

    Jian Zhao

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  1. Chun Cheng
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  2. Xin Li
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Correspondence to Aiguo Shen.

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Chun Cheng and Xin Li contributed equally to this work.

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Cheng, C., Li, X., Gao, S. et al. Expression of CAPON after Spinal Cord Injury in Rats. J Mol Neurosci 34, 109–119 (2008). https://doi.org/10.1007/s12031-007-9019-5

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