Synergistic effect of acupoint injection and moxibustion or catgut embedding or acupuncture on symptoms and expression of Th1/Th2 related cytokines in nasal mucosa of rats with allergic rhinitis

Abstract

To observe the effect of moxibustion, catgut embedding and acupuncture on allergic symptoms and expression of interferon-γ (IFN-γ) and interleukin-4 (IL-4) of nasal mucosa in rats with allergic rhinitis (AR) based on acupoint injection, so as to explore their synergistic effect and related mechanism in relieving AR. SD rats (half male half female) were randomly divided into normal control, model, acupoint injection (AI), AI+moxibustion, AI+catgut embedding and AI+acupuncture groups, with 8 rats in each group. The AR model was established by intraperitoneal injection of ovalbumin suspension (once every other day for 7 times), and intranasal drop of 0.5% ovalbumin solution (once daily for 7 days). After successful modeling, rats of the AI group received injection of a mixture solution of equal proportion of 1% lidocaine, dexamethasone and transfer factor into "Yingxiang" (LI20) and "Yintang" (EX-HN3) once every 4 days, 4 times altogether. Mild moxibustion or catgut embedment or manual acupuncture was applied to bilateral "Feishu" (BL13) and "Zusanli" (ST36). Both moxibustion (20 min every time) and acupuncture (with the needles retained for 30 min every time) were conducted once daily for 14 times, and catgut embedding was conducted once a week, twice altogether based on acupoint injection. The rats' nasal allergic reaction score (symptom score, 1-3 points) was given according to the times of nose scratching and sneezing, and the running nose state in 30 min, and histopathological changes of nasal mucosa were observed by H.E. staining. The expression levels of IFN-γ and IL-4 in the nasal mucosa were detected by immunohistochemistry and Western blot, separately. Compared with the normal group, the symptom score and the expression of IL-4 positive cells and protein in nasal mucosa were significantly increased (P<0.05), while the expression of IFN-γ positive cells and protein were considerably decreased in the model group (P<0.05). In comparison with the model group, the symptom score and the expression of IL-4 positive cells and protein were obviously decreased (P<0.05), while the expression of IFN-γ positive cells and protein were remarkably increased in the 4 treatment groups (P<0.05). The effects of AI+moxibustion, AI+catgut embedment, AI+acupuncture were signi-ficantly superior to those of simple AI in up-regulating the expression of IFN-γ positive cells and protein and in down-regulating the expression of IL-4 positive cells and protein (P<0.05). Both the symptom score and the expression of IL-4 were notably lower in the AI+moxibustion group than in the AI+catgut embedment and AI+acupuncture groups (P<0.05), whereas the expression of IFN-γ was apparently higher in the AI+moxibustion group than in the other 3 treatment groups (P<0.05). No significant differences were found between the AI+catgut embedment and AI+acupuncture groups in the levels of symptom score, IFN-γ and IL-4 expressions (P>0.05). Moxibustion or catgut embedment or acupuncture and AI have a synergistic effect in relieving symptoms of AR rats, which may be related to their function in regulating the expression levels of nasal IFN-γ and IL-4 proteins. The therapeutic effect of moxibustion is obviously superior to those of both acupuncture and catgut embedment.