title: Expression of CAPON after spinal cord injury in rats.
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.
authors: The Jiangsu Province Key Laboratory of Neuroregeneration, Nantong University, 19 Qi-xiu Road, Nantong, Jiangsu 226001, China.
authors: Chun
authors: C
authors: Cheng
authors: Xin
authors: X
authors: Li
authors: Shangfeng
authors: S
authors: Gao
authors: Shuqiong
authors: S
authors: Niu
authors: Mengling
authors: M
authors: Chen
authors: Jing
authors: J
authors: Qin
authors: Zhiqin
authors: Z
authors: Guo
authors: Jian
authors: J
authors: Zhao
authors: Aiguo
authors: A
authors: Shen
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D006801:Humans; D008297:Male; D052248:Nitric Oxide Synthase Type I / Q000235:genetics / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013119:Spinal Cord Injuries / Q000378:metabolism* / Q000473:pathology
chemical_list: D048868:Adaptor Proteins, Signal Transducing; C488082:NOS1AP protein, rat; D052248:Nitric Oxide Synthase Type I