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Amino Acid Incorporation Into Rat Spinal Cord And Brain After Simultaneous And Interval Sciatic Nerve Lesions

M. R. Wells, J. J. Bernstein
Published 1978 · Medicine

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The incorporation of [3H]lysine into the trichloracetic acid (TCA) precipitable protein and soluble fractions of brain and spinal cord of rats subjected to immediate transection distal and crush proximal or transection distal, two week interval, and crush proximal of the left sciatic nerve has been studied at 5, 11, and 18 days postoperative. In addition, the regeneration of the nerve fibers was measured. A greater rate of (P 18 day group > 5 day group. However, no significant differences in uptake into protein in spinal cord and brain were seen between the simultaneous lesion sciatic animals over postoperative days. In brain, differences between the [3H]lysine incorporation into protein of the left (L) and right (R) cortical hemispheres was noted. The incorporation into somatomotor cortex showed a L > R difference which was most pronounced after simultaneous sciatic nerve lesion. Interestingly, the largest R > L difference was in occipital cortex after interval lesions of sciatic nerve. In spinal cord, the protein radioactivity of the L5–6 and S1–4 segments which include most of the affected neurons was greater on the right (unlesioned) side than on the left (sciatic crush) side over all lesioned animals. This effect was most pronounced after interval sciatic lesion. The alteration of central nervous system incorporation of lysine after peripheral nerve (sciatic) lesion and regeneration are discussed.
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