[Effects of early electroacupuncture on the expression of Iba-1 and TNF-α in Parkinson's disease mice].

Abstract

To observe the effect of early electroacupuncture(EA) intervention on ionized calcium binding adapter molecule 1 (Iba-1), tyrosine hydroxylase (TH) and tumor necrosis factor-α (TNF-α) in Parkinson's disease (PD) mice, so as to explore its neuroinflammation mechanism in treating PD. A total of 24 male C57BL/6J mice (9 weeks old) were randomly divided into control, model and EA groups, with 8 mice in each group. The PD model was established by long-term low dose subcutaneous injection of rotenone. Started at the same time with modeling, EA (2 Hz/100 Hz, 1 mA) was applied to "Shenting"(GV24), bilateral "Tianshu"(LI11), "Quchi"(ST25), and "Shangjuxu"(ST37) for 15 min, once a day for 8 weeks. The motor function was assessed by rotorod test and step length test. The expression levels of Iba-1 and TH proteins in substantia nigra pars compacta (SNpc) was detected by Western blot and immunohistochemistry. The expression level of TNF-α protein in colon tissue was examined by Western blot and immunofluorescence staining. Compared with the control group, the fall latency shortened at 4, 6, and 8 weeks after modeling (P<0.01) and the step length of hind limbs shortened at 5 and 7 weeks after modeling (P<0.01), the expression levels of Iba-1 in SNpc and TNF-α in colon tissue were increased (P<0.01), and the expression level of TH in SNpc was decreased (P<0.01) in the model group. Compared with the model group, the fall latency prolonged at 6 and 8 weeks after modeling (P<0.01) and the step length of hind limbs prolonged at 5 and 7 weeks after modeling (P<0.01), the expression levels of Iba-1 in SNpc and TNF-α in colon tissue were decreased (P<0.01, P<0.05), and the expression level of TH in SNpc was increased (P<0.05, P<0.01) in the EA group. Early EA intervention can delay the occurring time of motor disfunction, alleviated the loss of substantia nigra dopaminergic neurons, and exerted a good neuroprotective effect on the degenerative changes in rotenone-induced PD mice, which may be related to its effects in alleviating the intestinal inflammation, inhibiting the activation of microglia, thereby reducing the neuroinflammation.