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Am J Physiol Cell Physiol 281: C849-C856, 2001;
0363-6143/01 $5.00
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Vol. 281, Issue 3, C849-C856, September 2001

Gene and protein expressions of nitric oxide synthases in ischemia-reperfused peripheral nerve of the rat

Wen-Ning Qi2, Zuo-Qin Yan1, Peter G. Whang1, Qi Zhou2, Long-En Chen1, Anthony V. Seaber1, Jonathan S. Stamler3, and James R. Urbaniak1

1 Orthopaedic Microsurgery Research Laboratory, Department of Surgery, 2 Orthopaedic Cell Biology Laboratory, and 3 Howard Hughes Medical Institute, Pulmonary and Cardiovascular Divisions, Department of Medicine, and Department of Cell Biology, Duke University Medical Center, Durham, North Carolina 27710

This study examined mRNA and protein expressions of neuronal (nNOS), inducible (iNOS), and endothelial nitric oxide synthases (eNOS) in peripheral nerve after ischemia-reperfusion (I/R). Sixty-six rats were divided into the ischemia only and I/R groups. One sciatic nerve of each animal was used as the experimental side and the opposite untreated nerve as the control. mRNA levels in the nerve were quantitatively measured by competitive PCR, and protein was determined by Western blotting and immunohistochemical staining. The results showed that, after ischemia (2 h), both nNOS and eNOS protein expressions decreased. After I/R (2 h of ischemia followed by 3 h of reperfusion), expression of both nNOS and eNOS mRNA and protein decreased further. In contrast, iNOS mRNA significantly increased after ischemia and was further upregulated (14-fold) after I/R, while iNOS protein was not detected. The results reveal the dynamic expression of individual NOS isoforms during the course of I/R injury. An understanding of this modulation on a cellular and molecular level may lead to understanding the mechanisms of I/R injury and to methods of ameliorating peripheral nerve injury.

nitric oxide synthase transcription; nitric oxide synthase translation; reperfusion; sciatic nerve


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