TY - JOUR
T1 - Alpha-lipoic acid provides neuroprotection from ischemia-reperfusion injury of peripheral nerve
AU - Mitsui, Yoshiyuki
AU - Schmelzer, James D.
AU - Zollman, Paula J.
AU - Mitsui, Manami
AU - Tritschler, Hans J.
AU - Low, Phillip A.
N1 - Funding Information:
Supported in part by grants from NINDS (NS22352) and Mayo funds.
PY - 1999/2/1
Y1 - 1999/2/1
N2 - Background: Reperfusion aggravates nerve ischemic fiber degeneration, likely by the generation of reduced oxygen species. We therefore evaluated if racemic α-lipoic acid (LA), a potent antioxidant, will protect peripheral nerve from reperfusion injury, using our established model of ischemia- reperfusion injury. Methods: We used male SD rats, 300±5 g. Ischemia was produced by the ligature of each of the supplying arteries to the sciatic- tibial nerve of the right hind-limb for predetermined periods of time (either 3 or 5 h), followed by the release of the ligatures, resulting in reperfusion. LA was given intraperitoneally daily for 3 days for both pre- and post-surgery. Animals received either LA, 100 mg/kg/day, or the same volume of saline intraperitoneally. Clinical behavioral score and electrophysiology of motor and sensory nerves were obtained at 1 week after ischemia-reperfusion. After electrophysiological examination, the sciatic- tibial nerve was fixed in situ and embedded in epon. We evaluated for ischemic fiber degeneration (IFD) and edema, as we described previously. Results: Distal sensory conduction (amplitude of sensory action potential and sensory conduction velocity (SCV) of digital nerve) was significantly improved in the 3-h ischemia group, treated with LA (P<0.05). LA also improved IFD of the mid tibial nerve (P=0.0522). LA failed to show favorable effects if the duration of ischemia was longer (5-h ischemia). Conclusion: These results suggest that α-lipoic acid is efficacious for moderate ischemia-reperfusion, especially on distal sensory nerves.
AB - Background: Reperfusion aggravates nerve ischemic fiber degeneration, likely by the generation of reduced oxygen species. We therefore evaluated if racemic α-lipoic acid (LA), a potent antioxidant, will protect peripheral nerve from reperfusion injury, using our established model of ischemia- reperfusion injury. Methods: We used male SD rats, 300±5 g. Ischemia was produced by the ligature of each of the supplying arteries to the sciatic- tibial nerve of the right hind-limb for predetermined periods of time (either 3 or 5 h), followed by the release of the ligatures, resulting in reperfusion. LA was given intraperitoneally daily for 3 days for both pre- and post-surgery. Animals received either LA, 100 mg/kg/day, or the same volume of saline intraperitoneally. Clinical behavioral score and electrophysiology of motor and sensory nerves were obtained at 1 week after ischemia-reperfusion. After electrophysiological examination, the sciatic- tibial nerve was fixed in situ and embedded in epon. We evaluated for ischemic fiber degeneration (IFD) and edema, as we described previously. Results: Distal sensory conduction (amplitude of sensory action potential and sensory conduction velocity (SCV) of digital nerve) was significantly improved in the 3-h ischemia group, treated with LA (P<0.05). LA also improved IFD of the mid tibial nerve (P=0.0522). LA failed to show favorable effects if the duration of ischemia was longer (5-h ischemia). Conclusion: These results suggest that α-lipoic acid is efficacious for moderate ischemia-reperfusion, especially on distal sensory nerves.
KW - Ischemia-reperfusion injury
KW - Ischemic fiber degeneration
KW - Neuroprotection
KW - Oxidative stress
KW - Peripheral nerve
KW - Sensory conduction velocity
KW - α-Lipoic acid
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U2 - 10.1016/S0022-510X(99)00017-9
DO - 10.1016/S0022-510X(99)00017-9
M3 - Article
C2 - 10223404
AN - SCOPUS:0033080764
SN - 0022-510X
VL - 163
SP - 11
EP - 16
JO - Journal of the neurological sciences
JF - Journal of the neurological sciences
IS - 1
ER -