Protective effect of rutin on myelin sheath injury in the sciatic nerve of rats induced by acrylamide

doi:10.16098/j.issn.0529-1356.2022.02.005

Abstract

Abstract:

Objective To investigate the effect of rutin (Rut) on sciatic nerve myelin injury induced by acrylamide（ACR）, and to observe the changes of myelin structure, myelin basic protein (MBP) and myelin associated glycoprotein (MAG) in rats exposed to ACR.

Methods Thirty-six adult male SD rats were randomly divided into 4 groups: control group (ddH2O), 20 mg/kg ACR exposure group (ACR), 100 mg/kg Rut pre-protection ACR exposure group (R1+ACR), 200 mg/kg Rut pre-protection ACR exposure group (R2+ACR), 9 rats in each group, and were given gastric gavage for 21 days. HE staining and transmission electron microscopy were used to observe the changes of the sciatic nerve myelin sheath structure, immunohistochemistry and Western blotting were used to detect the changes in the expression of MBP and MAG in each group of rats. Results Hind limb distance measurement showed that compared with the control group, the hind limb distance of rats in the ACR group increased with the prolonged exposure time (P<0.05). After pre-protection with Rut, the hind limb distance of the R1+ACR and R2+ACR groups was significantly lower than that in the ACR group. HE staining showed that after ACR was infected, nerve fibers were disordered and myelin swelling appeared, while in R2+ACR group, nerve fibers were orderly and myelin swelling was reduced. Transmission electron microscopy showed that the myelin in ACR group was swollen and loosened, vacuoles were found in the interlamellar area, and some axons had vacuolar degeneration. Compared with the ACR group, the laxity of myelin in the R2+ACR group was improved and vacuolar degeneration was not obvious, and only a few vacuoles were found in the myelin lamina and axons. Immunohistochemistry and Western blotting results showed that the expression levels of MBP and MAG in the ACR group decreased significantly compared with the control group (P<0.01), compared with ACR group, the expression levels of MBP and MAG in R1+ACR group and R2+ACR group increased (P<0.05). Conclusion Rut has a protective effect on myelin sheath in the sciatic nerve of rats induced by acrylamide, which may be related to the inhibition of Rut on the decreased expression of MBP and MAG in the sciatic nerve induced by ACR.

Key words: Acrylamide, Rutin, Sciatic nerve, Myelin basic protein, Myelin associated glycoprotein, Immunohistochemistry, Western blotting, Rat

CLC Number:

R338.7

BAI Yanxian JIA Hui ZHANG Tong LUO Yu-you ZHANG Chun-mei LUO Li MA Yu-xin LIU Jing. Protective effect of rutin on myelin sheath injury in the sciatic nerve of rats induced by acrylamide[J]. Acta Anatomica Sinica, 2022, 53(2): 166-172.

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