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    Effects of electroacupuncture at Chize (LU 5) versus Shangjuxu (ST 37) in rats with ulcerative colitis

    2015-05-18 09:01:35LuoQin羅欽LiZhitong李志同YangWeining楊偉寧LiShengjie李勝杰XieJieping解秸萍
    關(guān)鍵詞:尺澤上巨虛下丘腦

    Luo Qin (羅欽), Li Zhi-tong (李志同),2, Yang Wei-ning (楊偉寧), Li Sheng-jie (李勝杰), Xie Jie-ping (解秸萍)

    1 Department of Acupuncture and Massage, Beijing University of Chinese Medicine, Beijing 100029, China

    2 Department of Acupuncture and Massage, Changping Hospital of Traditional Chinese Medicine, Beijing 100029, China

    Basic Study

    Effects of electroacupuncture at Chize (LU 5) versus Shangjuxu (ST 37) in rats with ulcerative colitis

    Luo Qin (羅欽)1, Li Zhi-tong (李志同)1,2, Yang Wei-ning (楊偉寧)1, Li Sheng-jie (李勝杰)1, Xie Jie-ping (解秸萍)1

    1 Department of Acupuncture and Massage, Beijing University of Chinese Medicine, Beijing 100029, China

    2 Department of Acupuncture and Massage, Changping Hospital of Traditional Chinese Medicine, Beijing 100029, China

    Objective:To compare the effects between electroacupuncture (EA) at Chize (LU 5, the He-Sea point of the Lung Meridian) and Shangjuxu (ST 37, the lower He-Sea point of the large intestine) in rats with ulcerative colitis (UC) on the variations of mesenteric microcirculation and vasoactive intestinal peptide (VIP) in the colon, lung, and hypothalamus. The relative specificity of acupoints was also explored.

    Acupuncture Therapy; Electroacupuncture; Point, Chize (LU 5); Point, Shangjuxu (ST 37); Colitis, Ulcerative; Microcirculation; Vasoactive Intestinal Peptide

    The He-Sea point is one of the five Shu-Transport points. Based on traditional Chinese medicine (TCM) theories, the He-Sea point is for diarrhea caused by adverse flow of qi. Among the He-Sea points, Chize (LU 5), Ququan (LR 8) and Zusanli (ST 36) are more frequently used in treating vomiting and diarrhea[1]. Chize (LU 5) is the He-Sea point of the Lung Meridian. Boodletting at Chize (LU 5) can cure acute gastro-enteritis[2]. The lung and large intestine are internalexternally connected through meridians, and there is an interaction between the lung diseases and large intestine diseases[3-4]. Applying TCM theory on the lung always produces good effects in treating intestinal diseases[5]. The lower He-Sea points refer to the six specific acupoints of the Three Yang Meridians of Foot where qi of the six Fu organs descend and gather. As the lower He-Sea points can treat corresponding diseases of Fu organs, Shangjuxu (ST 37), the lower He-Sea point of the large intestine, is specially used for large intestine diseases[6]. As stated above, both Chize (LU 5) and Shangjuxu (ST 37) can treat intestinal diseases. Our previous study[7]indicated that electroacupuncture (EA) at Chize (LU 5) and Shangjuxu (ST 37) could produce beneficial effects in rats with chronic obstructive pulmonary diseases (COPD), a model of lung disease affecting the intestine. Chize (LU 5) showed better effects and the change of hypothalamus vasoactive intestinal peptide (VIP) possibly promoted its action mechanism. However, what is the difference between the two points in treating primary intestinal microcirculation abnormalities? Therefore, in this study, the ulcerative colitis (UC) rat model was established to investigate the different effects of Chize (LU 5) and Shangjuxu (ST 37) on mesenteric microcirculation and VIP in the colon, lung and hypothalamus.

    1 Materials and Methods

    1.1 Materials and apparatuses

    Acetic acid and urethane (Beijing Chemical Reagent Company, China); acupuncture needles (Beijing Zhongyantaihe Pharmaceutical Co., Ltd., China); Han’s nerve-acupoint stimulator (Nanjing Jisheng Medical Technology Co., Ltd., China); microcirculation microscopic tester XW-B-3 (Pathology Laboratory, Basic Medical College of Beijing University of Chinese Medicine, China); centrifuge 5810R (Eppendorf Company, Germany); VIP RIA Kits (Beijing Huanyataike Biomedical Technology Co., Ltd., China).

    1.2 Animals and groups

    Wistar rats [male, SPF-class, (200±20) g] were supplied by Xinglong Experimental Animal Breeding Factory of Haidian District, Beijing [SCXK-(JUN) 2007-004]. All rats were housed at (22±2) ℃ and humidity (60±5)% with free access to food and water. The study was performed in accordance with the guidelines approved by the Animal Ethics Committee of Beijing University of Chinese Medicine. After adaptive feeding for 3 d, the rats were randomly divided into four groups: a normal group, a model group, a Chize (LU 5) group and a Shangjuxu (ST 37) group, 7 in each group.

    1.3 Modeling

    The UC rat model was established by improved acetic acid method[8]. All rats fasted for 24 h but had free access to water before operation. After anesthetized with urethane, the rats were kept upside down. Rats in the model group, Chize (LU 5) group and Shangjuxu (ST 37) group were slowly injected with 10% acetic acid at 10 mL/(kg·bw) into the anus with a PVC tube of 2 mm in diameter, while rats in the normal group were injected with normal saline at 10 mL/(kg·bw). The solution was retained in the gut cavity at a depth of 8 cm, and then the rats were inverted by lifting their tails for 20 s.

    1.4 Acupoints and interventions

    The points Chize (LU 5) and Shangjuxu (ST 37) were located according to theExperimental Acupuncture Science[9].

    The interventions began on the third day after successful modeling. The normal group and model group only received fixed for 15 min once daily for 7 d. The Chize (LU 5) group and Shangjuxu (ST 37) group were given EA at Chize (LU 5) (depth: 3 mm) and Shangjuxu (ST 37) (depth: 5 mm) respectively with Han’s nerve-acupoint stimulator at 2 Hz/100 Hz and 0.2-0.4 mA for 15 min, once daily for 7 d.

    1.5 Microcirculation observation

    After all interventions, each rat was narcotized with 20% urethane at 7 mL/(kg·bw) injected into its lateral thigh muscle. Then they were fixed on the operation table in a supine position and made a 1-2 cm incision along the ventral midline. Get the mesentery near to the ileocecum, spread it in a physiological saline mesentery observation box at 37 ℃. Switch on the microcirculation microscopic tester and select a mesenteric micro-vessel at a length of 20-100 μm with a concomitant artery-vein and without tanglesome vessels around to make observation. Record changes of the mesenteric microvascular calibers and collect the static image of microvascular blood flow status with ×10, ×20, and ×40 microscope and dynamic image with ×20 and ×40 microscope every 10 min. Make observation and records for 4 times in a row and get the average data. The blood flow status was graded on the basis of semi-quantitative determination of velocity classification method[10].

    The grades criteria and their features are as follows. Grade 3: fastest blood flow, presenting as a smooth line strips and without particles. Grade 2: relatively faster blood flow, a few or even obvious particles. Grade 1: slow blood flow, presenting as sediment form. Grade 0: stasis of blood flow or even invisible.

    1.6 Sample preparation and VIP measurement

    The colon of over 3 cm from the anus, right lung and hypothalamus of each rat were separated and washed by iced saline. Cut each part at approximately 200 mg, and then put them into three slurry pipes with iced saline at 1:4 respectively. Grind the tissues on the ice tillcompletely mixed with the iced saline. Get them centrifuged at 4℃, 3 500 r/min for 15-20 min, then collect the supernate and store them at -20℃. VIP in the colon, lung and hypothalamus were measured by radioimmunoassay according to the VIP kit instructions.

    1.7 Statistical analysis

    2 Results

    2.1 General condition

    The normal group rats were in a good condition. The UC rats had loose stools with waste residue around the anus, accompanied by lassitude and a poor appetite since the third day after modeling. After the 7 d interventions, stools of the model group rats were still pasty, while this symptom was improved in Chize (LU 5) group and Shangjuxu (ST 37) group. As to Chize (LU 5) group rats, loose stools almost disappeared. Shangjuxu (ST 37) group rats had no loose stools and presented a good condition with good appetite and spirit.

    2.2 Mesenteric microcirculations analysis

    2.2.1 Mesenteric microvascular calibers

    Compared with the normal group, the calibers were significantly expanded in the model group and Chize (LU 5) group (P<0.05); there was no significant difference between the model group and Chize (LU 5) group (P>0.05); compared with the model group and Chize (LU 5) group, the calibers were obviously shrunk in Shangjuxu (ST 37) group (P<0.05), (Table 1 and Figure 1).

    2.2.2 Blood flow status

    The four groups showed no significant inter-group differences (P>0.05), (Table 1).

    2.3 Distribution of VIP in the colon, lung and hypothalamus

    The colonic VIP levels in the model group and Chize (LU 5) group were significantly higher than that in the normal group (P<0.01,P<0.05); the level in Shangjuxu (ST 37) group was markedly lower than that in the model group (P<0.01). VIP levels in lung and hypothalamus seemed no significant inter-group differences (P>0.05), (Table 2).

    Table 1. Comparison of mesenteric microvascular calibers and blood flow status

    Figure 1. Variation of mesenteric microvascular caliber (×20)

    Table 2. Distribution of VIP in different tissues

    Table 2. Distribution of VIP in different tissues

    Note: Compared with the normal group, 1) P<0.05, 2) P<0.01; compared with the model group, 3) P<0.01

    Group n Colon Lung Hypothalamus Normal 7 2.34±0.35 3.08±0.58 4.45±0.37 Model 7 4.08±0.352) 2.32±0.75 4.38±0.26 Chize (LU 5) 7 3.36±0.191) 2.57±0.68 5.17±0.52 Shangjuxu (ST 37) 7 2.64±0.343) 2.76±0.70 5.03±0.45

    3 Discussion

    UC is a form of inflammatory bowel diseases (IBD), and its main clinical symptoms include frequent small-volume diarrhea with urgency and blood[11]. Among various UC modeling methods, acetic acid modeling is frequently used for its convenience, short modeling period, high success rate and presents with similar acute symptoms and colonic pathology to UC in human. In this study, after anal injection of aceticacid, UC rats had loose stool. In our another related study[12], the colonic pathology showed that the gland structures of colonic epithelium were damaged. The mesenchyme appeared obvious edema and congestion with heavy neutrophil infiltration invasion. This infers that anal injection of acetic acid has successfully and rapidly induced UC models.

    The microcirculation mainly refers to the blood/fluid flow status of arterioles capillaries, lymphatic and tissue spaces. The microcirculation has a close correlation with the transmission of intercellular materials, information and energy[13]. Acupuncture can significantly affect the microcirculations of brain, nail fold, gastro-intestine, uterus[14]. The variation of mesenteric microcirculation can vividly show the differences of intestinal pathology among conditions of normal, UC and post-EA. This study found that the mesenteric microvascular calibers were significantly expanded after UC modeling, corresponding with the vessel variation in acute inflammation. Compared with the model group, the calibers of Shangjuxu (ST 37) group were significantly shrunk, while Chize (LU 5) group seemed no obvious change. We can infer that Shangjuxu (ST 37) helped relieve the change of mesenteric microvascular calibers along with the inflammation pathology, while Chize (LU 5) cannot. There was no significant difference in the blood flow status among the four groups. While in our previous study[7], both Chize (LU 5) and Shangjuxu (ST 37) could markedly reduce the fast blood flow of mesenteric microcirculation in COPD rats. This difference between our COPD and UC studies may be related to different disease models and disease inflammation processes. So, it indicates that Shangjuxu (ST 37) has a better regulation effect on mesenteric microcirculation than Chize (LU 5) in primary bowel diseases.

    VIP is one of the most important neuropeptides in intestine[15]. Besides intestine, VIP exists in many organs and VIP receptors are specially expressed in the lung and brain[16-17]. VIP has a strong vasodilator function and can inhibit the peristaltic reflex in the circular muscle layer and control intestinal blood flow[18-19]. It possesses powerful anti-inflammatory effects and participates in intestinal mucosal immunity[15,20]. In this study, the colonic VIP increased in the model group, serving as a self-protective reaction in acute inflammation, and it corresponds with the trend of mesenteric microvascular caliber change. VIP in Shangjuxu (ST 37) group was significantly lower than that in the model group, and was also associated with the microvascular caliber change. VIP in Chize (LU 5) group showed a decline trend, but without a significant difference. It also prompts that Shangjuxu (ST 37) has a better anti-inflammatory effect on UC. It was found in our another related study[12]that both Chize (LU 5) and Shangjuxu (ST 37) significantly down-regulated colonic tumor necrosis factor (TNF)-α level in UC rats. So, the effect of Chize (LU 5) could not be denied. Chize (LU 5) might show relative lag effects on anti-inflammatory. These different effects may be associated with the different nerve segments[21]. The colonic nerve segment locates at the level of T6-L3, Shangjuxu (ST 37) at the level of L4-S2and Chize (LU 5) at C5-C6. The nerve segments of colon and Shangjuxu (ST 37) are relatively near, so Shangjuxu (ST 37) has a quicker nerveendocrine-immune system response than Chize (LU 5)[22].

    ‘The correlation between acupoints and Zang-fu organs’ is one of the basic contents of acupuncture theories. It’s been proven that an acupoint can treat different diseases of Zang-fu organs, meanwhile different acupoints can used for the same disease of Zang-fu organs[23-24]. This shows that acupoints should have relative specificity in treatment. The results of this study indicate that Shangjuxu (ST 37) should have better benefits in treating UC than Chize (LU 5). It can be concluded that when diarrhea results from intestine itself, the efficacy of Shangjuxu (ST 37, the lower He-Sea point of large intestine) seems better than that of Chize (LU 5, the He-Sea point of the Lung Meridian). The lower He-Sea point can treat its corresponding diseases of Fu organ and the He-Sea point can treat diarrhea caused by adverse flowing qi. Chize (LU 5) belongs to Water in the Five Elements, so it has the kidney characteristic for the five Zang organs and the Five Elements are correlated with each other. The kidney dominates the transportation and distribution of water from the stomach. If the kidney fails to transform qi, the water will go down and stay in the intestine, and diarrhea will appear. Therefore, both Chize (LU 5) and Shangjuxu (ST 37) can treat diarrhea, while Shangjuxu (ST 37) tends to work better for diarrhea caused by intestine itself such as UC, and Chize (LU 5) tends to diarrhea caused by disturbance of kidney qi.

    In this study, VIP in lung and hypothalamus showed insignificant inter-group differences, which is different from our COPD study[7]. This might be associated with the modeling method. Even though acetic acid modeling could present with similar human acute UC symptoms and pathological changes[25], the complex pathogenesis of UC and the chronic recurrent characteristics could not be reflected. The complex pathogenesis might involve the interactions among genes, environment, microorganism and the immune system[26]. Therefore, the lung and hypothalamus were not influenced yet in a short time. In the further study, the modeling methods need more careful consideration.

    In conclusion, our results suggest that the effects of Chize (LU 5) and Shangjuxu (ST 37) are different in treating UC. Shangjuxu (ST 37) showed better efficacies in reducing VIP in the colon and regulating mesentericmicrocirculation, while the effects of Chize (LU 5) were not significant. The results of our COPD[7]study and this study jointly support that acupoints have relative specificity in treatment.

    Conflict of Interest

    There was no conflict of interest in this article.

    Acknowledgments

    This work was supported by the Independent Subject Project of Beijing University of Chinese Medicine for Postgraduate (北京中醫(yī)藥大學(xué)在讀研究生自主選題項(xiàng)目, No.2011-JYBZZ-XS099).

    Statement of Informed Consent

    The treatment of animals conformed to the ethical criteria in this experiment.

    Received: 25 December 2014/Accepted: 28 January 2015

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    [17] Harmar AJ, Arimura A, Gozes I, Journot L, Laburthe M, Pisegna JR, Rawlings SR, Robberecht P, Said SI, Sreedharan SP, Wank SA, Waschek JA. Nomenclature of receptors for vasoactive intestinal peptide and pituitary adenylate cyclase-activating polypeptide. Pharmacol Rev, 1998, 50(2): 265-270.

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    [19] Kimata H, Fujimoto M. Vasoactive intestinal peptide specifically induces human IgA1 and IgA2 production. Eur J Immunol, 1994, 24(9): 2262-2265.

    [20] Blinman TA, Gukovsky I, Mouria M, Zaninovic V, Livingston E, Pandol SJ, Gukovskaya AS. Activation of pancreatic acinar cells on isolation from tissue cytokine up regulation via p38 MAP kinase. Am J Physiol Cell Physiol, 2000, 279(6): 1993-2003.

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    [22] Chen SZ. Observation on ‘a(chǎn)cupoints-viscera relevant law’of stomach channel by clinical experience statistics. JCAM, 2010, 26(8): 8-10.

    [23] Yan J, Yang RD, Yi SX, Chang XR, Lin YP. Study on regularity of multi-meridians controlling a same organ from the protective action of acupuncture at different acupoints on gastric mucosa in the rabbit. Zhongguo Zhen Jiu, 2004, 24(8): 579-582.

    [24] Wang XY, Wu FD, Wang SJ, Ying ZH, Huang XH. Theoretic discussion on acupoint and visceral coupling and influence of E-acupuncture Zusanli on model rats’ organs microcirculation with disordered gastricintestinal function. Zhejiang Zhongyiyao Daxue Xuebao, 2011, 35(3): 415-417.

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    電針尺澤及電針上巨虛對(duì)潰瘍性結(jié)腸炎大鼠的影響比較

    目的:比較電針尺澤(肺經(jīng)合穴)與上巨虛(大腸下合穴)對(duì)潰瘍性結(jié)腸炎(ulcerative colitis, UC)大鼠腸系膜微循環(huán)及結(jié)腸、肺、下丘腦中血管活性腸肽(vasoactive intestinal peptide, VIP)的不同影響, 并探討腧穴相對(duì)特異性規(guī)律。方法:將28只Wistar雄性大鼠隨機(jī)分為正常組、模型組、尺澤組及上巨虛組, 每組7只。采用乙酸灌腸法制備UC模型。灌腸后第3天起, 尺澤組與上巨虛組每日分別電針尺澤穴、上巨虛穴15 min, 連續(xù)治療7天后取材。微循環(huán)儀觀察腸系膜微血管管徑及血液流態(tài)變化; 放射免疫法測(cè)定結(jié)腸、肺及下丘腦VIP含量。結(jié)果:模型組腸系膜微循環(huán)管徑較正常組顯著擴(kuò)大(P<0.05); 模型組與尺澤組無顯著差異(P>0.05); 上巨虛組較模型組、尺澤組顯著縮小(P<0.05)。各組血液流態(tài)無統(tǒng)計(jì)學(xué)差異(P>0.05)。模型組、尺澤組結(jié)腸VIP含量較正常組顯著升高(P<0.01,P<0.05);上巨虛組較模型組顯著下降(P<0.05)。各組肺、下丘腦VIP含量無顯著差異(P>0.05)。結(jié)論:尺澤穴和上巨虛穴對(duì)UC效應(yīng)不同, 上巨虛穴能降低UC大鼠結(jié)腸VIP, 改善腸道微循環(huán), 尺澤穴效應(yīng)不明顯。

    針刺療法; 電針; 穴, 尺澤; 穴, 下巨虛; 結(jié)腸炎, 潰瘍性; 微循環(huán); 血管活性腸肽

    R2-03 【

    】A

    Author: Luo Qin, 2012 master degree candidate

    Xie Jie-ping, M.D., professor.

    E-mail: xiejieping@sina.com.

    Methods: A total of 28 male Wistar rats were randomized into a normal group, a model group, a Chize (LU 5) group and a Shangjuxu (ST 37) group, 7 rats in each group. The UC model was established by enema with acetic acid. Since the third day after modeling, rats in the Chize (LU 5) group and Shangjuxu (ST 37) group respectively received EA at Chize (LU 5) and Shangjuxu (ST 37), 15 min each time for successive 7 d. The variations of mesenteric microvascular calibers and blood flow status were observed by a microcirculation microscopic tester; VIP in the colon, lung and hypothalamus was measured by radioimmunoassay.

    Results:Compared with the normal group, the mesenteric microvascular calibers were significantly expanded in the model group (P<0.05); there was no significant difference between the model group and Chize (LU 5) group (P>0.05); compared with the model group and Chize (LU 5) group, the calibers were obviously shrunk in Shangjuxu (ST 37) group (P<0.05). The four groups showed no significant inter-group differences in comparing blood flow status (P>0.05). The colonic VIP levels in the model group and Chize (LU 5) group were significantly higher than that in the normal group (P<0.01,P<0.05); the VIP level in Shangjuxu (ST 37) group was markedly lower than that in the model group (P<0.01). There were no significant differences among the four groups in comparing VIP level in lung and hypothalamus (P>0.05).

    Conclusion:The effects of Chize (LU 5) and Shangjuxu (ST 37) were different in treating UC. Shangjuxu (ST 37) showed a more significant efficacy in down-regulating VIP in the colon and regulating mesenteric microcirculation, while the effects of Chize (LU 5) were not obvious.

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