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        頭痛寧膠囊對(duì)偏頭痛大鼠中腦降鈣素基因相關(guān)肽表達(dá)的影響

        2014-09-15 16:57:10姚剛趙繼福黃倩于挺敏
        關(guān)鍵詞:偏頭痛

        姚剛+趙繼福+黃倩+于挺敏

        [摘要] 目的 探討頭痛寧膠囊干預(yù)偏頭痛大鼠,對(duì)模型大鼠中腦降鈣素基因相關(guān)肽(CGRP)基因表達(dá)的影響,及頭痛寧膠囊對(duì)內(nèi)源性痛覺(jué)調(diào)制系統(tǒng)功能的干預(yù)作用。 方法 將24只健康成年Wistar大鼠隨機(jī)分為對(duì)照組(A組),偏頭痛組(B組),頭痛寧膠囊對(duì)照組(C組),頭痛寧膠囊治療組(D組),每組6只。C、D組給予頭痛寧膠囊0.375 g/(kg·d)灌胃7 d,之后B、D組大鼠制備硝酸甘油型偏頭痛大鼠模型,造模2 h處死大鼠,取中腦組織。采用實(shí)時(shí)定量PCR檢測(cè)各組大鼠中腦CGRP mRNA拷貝數(shù)。 結(jié)果 A、B、C、D組大鼠中腦每250 ng總RNA中腦CGRP mRNA拷貝數(shù)分別為:(1.13±0.68)×104、(1.61±0.51)×104、(0.80±0.45)×104、(0.75±0.27)×104。A組與B組、C組與D組大鼠中腦CGRP mRNA拷貝數(shù)比較,差異均無(wú)統(tǒng)計(jì)學(xué)意義(P > 0.05);C、D組大鼠中腦CGRP mRNA拷貝數(shù)明顯低于B組,差異有統(tǒng)計(jì)學(xué)意義(P < 0.05)。 結(jié)論 頭痛寧膠囊可以降低偏頭痛發(fā)作時(shí)中腦CGRP基因的表達(dá),發(fā)揮治療偏頭痛的作用。

        [關(guān)鍵詞] 降鈣素基因相關(guān)肽;偏頭痛;頭痛寧膠囊

        [中圖分類號(hào)] R747.2 [文獻(xiàn)標(biāo)識(shí)碼] A [文章編號(hào)] 1673-7210(2014)08(c)-0012-04

        Effects of Toutongning Capsule on CGRP expression in the midbrain of rats with migraine headache model

        YAO Gang1 ZHAO Jifu2 HUANG Qian1 YU Tingmin1▲

        1.Department of Neurology, the Second Hospital of Jilin University, Jilin Province, Changchun 130041, China; 2. Department of Medical, Changchun Hospital of Traditional Chinese Medicine, Jilin Province, Changchun 130022, China

        [Abstract] Objective To investigate the effects of Toutongning Capsule on Calcitonin gene-related peptide (CGRP) expression in the midbrain of rats with migraine headache, and the intervention effect of Toutongning Capsule on the function of endogenous pain modulation system. Methods A total of 24 adult Wistar rats were divided into control group (group A), model group (group B), Toutongning Capsule control group (group C) and Toutongning Capsule treatment group (group D), with 6 rats in each group. Group C and group D were given the Toutongning Capsule 0.375 g/(kg·d) for 7 days. 2 hours following nitroglycerin injection, the midbrains of rats were isolated and the expression of CGR was detected by real-time quantitative PCR. Results CGRP mRNA levels (CGRP mRNA copies per 250 ng total RNA) in the rat midbrain of group A, B, C, D were (1.13±0.68)×104, (1.61±0.51)×104, (0.80±0.45)×104, (0.75±0.27)×104 respectively. CGRP mRNA levels were similar between group A and group B, group C and group D, there were no significant differences in the CGRP mRNA copy number in the rat midbrain (P > 0.05). The CGRP mRNA levels were significantly lower in the group C and group D compared with the groups B, the difference was statistically significant (P < 0.05). Conclusion The therapeutically beneficial effects of Toutongning Capsule to migraine headaches is ralated to downregulation of calcitonin gene-related peptide mRNA expressions in the midbrain.

        [Key words] Calcitonin gene-related peptide; Migraine; Toutongning Capsule

        降鈣素基因相關(guān)肽(calcitonin gene-related peptide,CGRP)是內(nèi)源性痛覺(jué)調(diào)制系統(tǒng)中重要的中介物質(zhì),拮抗和減弱內(nèi)源性阿片肽在中腦的鎮(zhèn)痛效應(yīng),參與調(diào)節(jié)內(nèi)源性痛覺(jué)調(diào)制系統(tǒng)的功能[1-2]。頭痛寧膠囊對(duì)多種慢性頭痛(如偏頭痛、緊張型頭痛等)均有較為滿意的療效[3-4]。該藥對(duì)內(nèi)源性痛覺(jué)調(diào)制系統(tǒng)的關(guān)鍵結(jié)構(gòu)——中腦CGRP的表達(dá)是否產(chǎn)生影響目前尚無(wú)相關(guān)研究。本實(shí)驗(yàn)通過(guò)觀察頭痛寧膠囊對(duì)偏頭痛模型大鼠中腦CGRP mRNA表達(dá)的影響,探討該藥對(duì)偏頭痛的治療機(jī)制。

        1 材料與方法

        1.1 試劑與儀器

        頭痛寧膠囊(咸陽(yáng)步長(zhǎng)制藥有限公司);硝酸甘油注射劑(山西康寶生物制品股份有限公司);RNAiso Reagent、RNA PCR Kit(AMV)Ver.3.0、E.coli DH5α、pEASY-T1 Vector、限制酶BamH Ⅰ和EcoR Ⅴ、SYBR Premix Ex TaqTM均購(gòu)自大連TaKaRa公司;AxyPrep DNA Gel Extraction Kit及AxyPrep Plasmid Miniprep Kit購(gòu)自Axygen Biosciences公司;其他試劑均為國(guó)產(chǎn)分析純。PCR儀(Perkin Elmer GeneAmp PCR system2400);臺(tái)式冷凍離心機(jī)(MIKRO 22R zentrifugen);超低溫冰箱(MDF-382E);Sub-Cell GT(Agarose Gel Electrophoresis Systems,BIO-RAD);BIO-RAD Power PAC 200/300穩(wěn)壓穩(wěn)流電泳儀;凝膠成像系統(tǒng)(Kada);紫外分光光度計(jì)(UV-2401PC,Shimadzu),軟件:UVPC version 3.9;定量PCR儀(ABI PRISM 7500)。

        1.2 方法

        1.2.1實(shí)驗(yàn)動(dòng)物、分組、藥物干預(yù)、造模

        健康Wistar大鼠24只,雌雄各半,200~220 g,由吉林大學(xué)基礎(chǔ)醫(yī)學(xué)院動(dòng)物中心提供。24只健康成年Wistar大鼠,隨機(jī)分為4組:對(duì)照組(A組),偏頭痛組(B組),頭痛寧膠囊對(duì)照組(C組),頭痛寧膠囊治療組(D組),每組6只。根據(jù)成人每日口服劑量換算得到實(shí)驗(yàn)大鼠給藥劑量,頭痛寧膠囊對(duì)照組和頭痛寧膠囊治療組給予頭痛寧膠囊0.375 g/(kg·d)灌胃,對(duì)照組、偏頭痛組給予生理鹽水2 mL/d灌胃給藥,連續(xù)給藥7 d后,偏頭痛組和頭痛寧膠囊對(duì)照組大鼠制備偏頭痛大鼠模型(臀部皮下注射硝酸甘油注射劑10 mg/kg),以造模大鼠出現(xiàn)爬籠次數(shù)增多、前肢頻繁搔頭、往返運(yùn)動(dòng)、咬尾等不適的癥狀為造模成功的指標(biāo)[6]。對(duì)照組和頭痛寧膠囊對(duì)照組大鼠皮下注射生理鹽水2 mL/kg。

        1.2.2 標(biāo)本采集

        造模2 h時(shí)10%水合氯醛麻醉大鼠(0.3 mL/100 g),取腦,分離中腦,-70℃保存。

        1.2.3 實(shí)時(shí)定量PCR

        1.2.3.1 cDNA合成 按RNA提取試劑盒說(shuō)明書提取各組大鼠中腦總RNA。MgCl2 4 μL, RNase Inhibitor 0.5 μL, AMV Reverse Transcriptase 1 μL,5×RT Buffer 4 μL, dNTP Mixture (各10 mmol/L) 2 μL, Random 9 mers 1 μL, 總RNA 250 ng,以及RNase Free dH2O,總體積為20 μL。逆轉(zhuǎn)錄反應(yīng)條件:30℃ 10 min,42℃ 30 min,99℃ 5 min,5℃ 5 min。

        1.2.3.2 標(biāo)準(zhǔn)品制備 CGRP引物上游5'-AAGTTCTCCCCTTTCCTGGT-3',下游5'-GGTGGGCACAAAGTTG TCCT-3'。PCR擴(kuò)增反應(yīng)條件:變性(94℃ 30s),退火(53℃ 30 s),延伸(72℃ 30 s),35個(gè)循環(huán)。試劑盒回收、純化PCR擴(kuò)增的目的基因,與pEASY-T1載體連接,之后轉(zhuǎn)化到E.coli DH5α中,氨芐青霉素篩選,試劑盒提取質(zhì)粒,限制酶BamH Ⅰ、EcoR Ⅴ雙酶切鑒定及測(cè)序,證實(shí)CGRP cDNA全長(zhǎng)完全正確。計(jì)算所提取質(zhì)粒的拷貝數(shù)(測(cè)OD260值),作為標(biāo)準(zhǔn)品(無(wú)菌水10倍系列稀釋后分裝),-20℃保存。

        1.2.3.3 SYBR GreenⅠ實(shí)時(shí)定量PCR SYBR Premix ExTaqTM 10 μL,ROX Reference Dye 0.4 μL,上下游引物各0.4 μL(10 μmol/L),cDNA標(biāo)本2.0 μL,dH2O 6.8 μL,總反應(yīng)體系為20 μL。10倍系列稀釋的標(biāo)準(zhǔn)品,同時(shí)進(jìn)行PCR擴(kuò)增。各標(biāo)本均做3個(gè)復(fù)孔。反應(yīng)條件:變性(94℃ 30 s),退火(53℃ 30 s),延伸(72℃ 30 s),共40個(gè)循環(huán)。同時(shí)進(jìn)行熔解曲線分析,分析模式:95℃ 15 s,60℃ 20 s,95℃ 15 s。

        1.3 統(tǒng)計(jì)學(xué)方法

        采用SPSS 17.0統(tǒng)計(jì)學(xué)軟件進(jìn)行數(shù)據(jù)分析,計(jì)量資料數(shù)據(jù)用均數(shù)±標(biāo)準(zhǔn)差(x±s)表示,組間差別采用單因素方差分析和Tukey比較,以P < 0.05為差異有統(tǒng)計(jì)學(xué)意義。

        2 結(jié)果

        2.1 CGRP質(zhì)粒標(biāo)準(zhǔn)品

        采用普通PCR獲得CGRP基因擴(kuò)增產(chǎn)物,純化回收,與pEASY-T1載體連接成為重組質(zhì)粒(標(biāo)準(zhǔn)品),質(zhì)粒標(biāo)準(zhǔn)品經(jīng)過(guò)雙酶切鑒定與預(yù)期結(jié)果一致,測(cè)序結(jié)果回報(bào)所克隆序列同靶基因序列的同源性達(dá)100%。

        2.2 CGRP標(biāo)準(zhǔn)品實(shí)時(shí)定量PCR標(biāo)準(zhǔn)曲線

        利用10倍系列稀釋的CGRP質(zhì)粒標(biāo)準(zhǔn)品制作PCR標(biāo)準(zhǔn)曲線?;驒z測(cè)的下限為2.7×103拷貝/μL,檢測(cè)的上限為2.7×109拷貝/μL,回歸方程Ct= -2.69Log(x)+38.875,r=0.993,線性范圍達(dá)7個(gè)數(shù)量級(jí)(圖1)。

        圖1 降鈣素基因相關(guān)肽基因標(biāo)準(zhǔn)品實(shí)時(shí)定量PCR標(biāo)準(zhǔn)曲線

        2.3 產(chǎn)物特異性

        熔解曲線分析結(jié)果顯示,10倍系列稀釋的CGRP質(zhì)粒標(biāo)準(zhǔn)品PCR產(chǎn)物熔解曲線峰值均在88℃,峰形銳利,說(shuō)明產(chǎn)物特異。

        2.4 各組大鼠中腦CGRP mRNA表達(dá)量

        根據(jù)標(biāo)準(zhǔn)曲線,計(jì)算機(jī)可直接計(jì)算出各標(biāo)本模板的CGRP mRNA初始含量(圖2)。各標(biāo)本PCR擴(kuò)增產(chǎn)物熔解曲線峰值也在88℃,說(shuō)明產(chǎn)物特異。各組大鼠中腦每250 ng總RNA中腦CGRP mRNA拷貝數(shù)分別為(1.13±0.68)×104、(1.61±0.51)×104、(0.80±0.45)×104、(0.75±0.27)×104。A、B組大鼠中腦CGRP mRNA拷貝數(shù)比較,差異無(wú)統(tǒng)計(jì)學(xué)意義(P > 0.05);C、D組大鼠中腦CGRP mRNA拷貝數(shù),差異無(wú)統(tǒng)計(jì)學(xué)意義(P > 0.05);C、D組大鼠中腦CGRP mRNA拷貝數(shù)比較,明顯低于B組,差異有統(tǒng)計(jì)學(xué)意義(P < 0.05)。

        ★P < 0.05

        圖2 各組大鼠中腦CGRP mRNA表達(dá)情況

        3 討論

        頭痛寧膠囊由天麻、土茯苓、制何首烏、防風(fēng)、全蝎、當(dāng)歸六味藥材按照GMP標(biāo)準(zhǔn)嚴(yán)格生產(chǎn)的中成藥制劑。多數(shù)單藥組分具有鎮(zhèn)痛作用,天麻具有鎮(zhèn)靜、安神、減輕頭痛等作用[7]。動(dòng)物實(shí)驗(yàn)發(fā)現(xiàn),土茯苓能明顯提高小鼠的熱板痛閾值[8]。當(dāng)歸的抗氧化和抗自由基效應(yīng),起到神經(jīng)保護(hù)的作用[9]。全蝎中含有的蝎毒多肽具有很強(qiáng)的鎮(zhèn)痛作用。有研究發(fā)現(xiàn):頭痛寧膠囊可以上調(diào)偏頭痛大鼠中腦腦啡肽原mRNA的表達(dá),進(jìn)而增加與內(nèi)源性鎮(zhèn)痛直接相關(guān)的兩種腦啡肽(甲硫氨酸腦啡肽和亮氨酸腦啡肽)在中腦的含量,說(shuō)明頭痛寧膠囊對(duì)內(nèi)源性痛覺(jué)調(diào)制系統(tǒng)的功能發(fā)揮調(diào)節(jié)作用[10]。

        內(nèi)源性痛覺(jué)調(diào)制系統(tǒng)的核心結(jié)構(gòu)是中腦導(dǎo)水管周圍灰質(zhì)(periaqueductal gray,PAG),凡是由激活更高中樞所產(chǎn)生的鎮(zhèn)痛效應(yīng),大部分都被證明是通過(guò)PAG才得以實(shí)現(xiàn)的,這充分體現(xiàn)了PAG在痛覺(jué)調(diào)制中的重要性[11-12]。PAG與延髓頭端腹內(nèi)側(cè)網(wǎng)狀結(jié)構(gòu)相連接,調(diào)節(jié)脊髓背角的痛覺(jué)初級(jí)傳入活動(dòng),這一過(guò)程通過(guò)下行抑制通路得以實(shí)現(xiàn)。CGRP作為內(nèi)源性痛覺(jué)調(diào)制系統(tǒng)中重要的中介物質(zhì),參與疼痛與鎮(zhèn)痛過(guò)程。

        本研究以頭痛寧膠囊為干預(yù)因素,觀察其對(duì)硝酸甘油型偏頭痛大鼠中腦CGRP表達(dá)的影響,進(jìn)一步觀察頭痛寧膠囊對(duì)內(nèi)源性痛覺(jué)調(diào)制系統(tǒng)的調(diào)節(jié)作用,探討其治療偏頭痛的中樞機(jī)制。本實(shí)驗(yàn)建立的檢測(cè)大鼠CGRP基因的實(shí)時(shí)定量PCR方法,具有很高的敏感性和重復(fù)性,使得實(shí)驗(yàn)結(jié)果精確可靠。實(shí)驗(yàn)結(jié)果發(fā)現(xiàn):以頭痛寧膠囊作為干預(yù)因素的偏頭痛大鼠,其中腦CGRP mRNA表達(dá)明顯低于偏頭痛模型大鼠,說(shuō)明頭痛寧膠囊對(duì)偏頭痛大鼠中腦CGRP基因表達(dá)具有抑制作用。

        CGRP與偏頭痛關(guān)系極為密切,在外周,CGRP是最有效的血管擴(kuò)張肽[13],CGRP與位于腦血管平滑肌的CGRP受體結(jié)合導(dǎo)致腦血管異常擴(kuò)張[14-15],引發(fā)頭痛。三叉神經(jīng)血管末梢釋放的CGRP可觸發(fā)腦膜肥大細(xì)胞脫顆粒,進(jìn)而引發(fā)一系列生物學(xué)反應(yīng),誘發(fā)腦膜神經(jīng)源性炎癥[16],導(dǎo)致頭痛發(fā)生。除此以外,CGRP還是三叉神經(jīng)脊束核中傷害性感受神經(jīng)元的神經(jīng)調(diào)質(zhì)[17],傳遞痛覺(jué)信息。在中腦,CGRP的主要作用是拮抗內(nèi)源性阿片肽的鎮(zhèn)痛效應(yīng)[18]。本研究發(fā)現(xiàn)頭痛寧膠囊可以下調(diào)偏頭痛大鼠中腦CGRP的基因表達(dá),由此認(rèn)為頭痛寧膠囊治療偏頭痛的機(jī)制與其抑制中腦CGRP的表達(dá)有關(guān)。

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        [8] 吳麗明,張敏.土茯苓中落新婦甙的利尿和鎮(zhèn)痛作用[J].中藥材,1995,18(12):627-630.

        [9] 巫少榮,李自成,裘漢璋.當(dāng)歸在心血管系統(tǒng)的作用[J].中醫(yī)藥研究,2001,17(3):56-58.

        [10] Yao G,Man YH,Qi JJ,et al. Effects of Toutongning capsule on enkephalin in a rat migraine headache model [J]. Neural Regeneration Research,2011,6(9):661-665.

        [11] Tuveson B,Leffler AS,Hansson P. Influence of heterotopic noxious conditioning stimulation on spontaneous pain and dynamic mechanical allodynia in central post-stroke pain patients [J]. Pain,2009,143(1-2):84-91.

        [12] Potvin S,Grignon S,Marchand S. Human evidence of a supra-spinal modulating role of dopamine on pain perception [J]. Synapse,2009,63(5):390-402.

        [13] Brain SD,Grant AD. Vascular actions of calcitonin gene-related peptide and adrenomedullin [J]. Physiol Rev,2004, 84(3):903-934.

        [14] Edvinsson L,Alm R,Shaw D,et al. Effect of the CGRP receptor antagonist BIBN4096BS in human cerebral,coronary and omental arteries and in SK-N-MC cells [J]. Eur J Pharmacol,2002,434(1-2):49-53.

        [15] Moreno MJ,Abounader R,Hebert E,et al. Efficacy of the non-peptide CGRP receptor antagonist BIBN4096BS in blocking CGRP-induced dilations in human and bovine cerebral arteries:potential implications in acute migraine treatment [J]. Neuropharmacology,2002,42(4):568-576.

        [16] Theoharides TC,Donelan J,Kandere-Grzybowska K,et al. The role of mast cells in migraine pathophysiology [J]. Brain Res Brain Res Rev,2005,49(1):65-76.

        [17] Messlinger K. Migraine:where and how does the pain originate [J]. Exp Brain Res,2009,196(1):179-193.

        [18] 謝啟文.神經(jīng)肽[M].上海:復(fù)旦大學(xué)出版社,2004:7.

        (收稿日期:2014-05-14 本文編輯:任 念)

        [10] Yao G,Man YH,Qi JJ,et al. Effects of Toutongning capsule on enkephalin in a rat migraine headache model [J]. Neural Regeneration Research,2011,6(9):661-665.

        [11] Tuveson B,Leffler AS,Hansson P. Influence of heterotopic noxious conditioning stimulation on spontaneous pain and dynamic mechanical allodynia in central post-stroke pain patients [J]. Pain,2009,143(1-2):84-91.

        [12] Potvin S,Grignon S,Marchand S. Human evidence of a supra-spinal modulating role of dopamine on pain perception [J]. Synapse,2009,63(5):390-402.

        [13] Brain SD,Grant AD. Vascular actions of calcitonin gene-related peptide and adrenomedullin [J]. Physiol Rev,2004, 84(3):903-934.

        [14] Edvinsson L,Alm R,Shaw D,et al. Effect of the CGRP receptor antagonist BIBN4096BS in human cerebral,coronary and omental arteries and in SK-N-MC cells [J]. Eur J Pharmacol,2002,434(1-2):49-53.

        [15] Moreno MJ,Abounader R,Hebert E,et al. Efficacy of the non-peptide CGRP receptor antagonist BIBN4096BS in blocking CGRP-induced dilations in human and bovine cerebral arteries:potential implications in acute migraine treatment [J]. Neuropharmacology,2002,42(4):568-576.

        [16] Theoharides TC,Donelan J,Kandere-Grzybowska K,et al. The role of mast cells in migraine pathophysiology [J]. Brain Res Brain Res Rev,2005,49(1):65-76.

        [17] Messlinger K. Migraine:where and how does the pain originate [J]. Exp Brain Res,2009,196(1):179-193.

        [18] 謝啟文.神經(jīng)肽[M].上海:復(fù)旦大學(xué)出版社,2004:7.

        (收稿日期:2014-05-14 本文編輯:任 念)

        [10] Yao G,Man YH,Qi JJ,et al. Effects of Toutongning capsule on enkephalin in a rat migraine headache model [J]. Neural Regeneration Research,2011,6(9):661-665.

        [11] Tuveson B,Leffler AS,Hansson P. Influence of heterotopic noxious conditioning stimulation on spontaneous pain and dynamic mechanical allodynia in central post-stroke pain patients [J]. Pain,2009,143(1-2):84-91.

        [12] Potvin S,Grignon S,Marchand S. Human evidence of a supra-spinal modulating role of dopamine on pain perception [J]. Synapse,2009,63(5):390-402.

        [13] Brain SD,Grant AD. Vascular actions of calcitonin gene-related peptide and adrenomedullin [J]. Physiol Rev,2004, 84(3):903-934.

        [14] Edvinsson L,Alm R,Shaw D,et al. Effect of the CGRP receptor antagonist BIBN4096BS in human cerebral,coronary and omental arteries and in SK-N-MC cells [J]. Eur J Pharmacol,2002,434(1-2):49-53.

        [15] Moreno MJ,Abounader R,Hebert E,et al. Efficacy of the non-peptide CGRP receptor antagonist BIBN4096BS in blocking CGRP-induced dilations in human and bovine cerebral arteries:potential implications in acute migraine treatment [J]. Neuropharmacology,2002,42(4):568-576.

        [16] Theoharides TC,Donelan J,Kandere-Grzybowska K,et al. The role of mast cells in migraine pathophysiology [J]. Brain Res Brain Res Rev,2005,49(1):65-76.

        [17] Messlinger K. Migraine:where and how does the pain originate [J]. Exp Brain Res,2009,196(1):179-193.

        [18] 謝啟文.神經(jīng)肽[M].上海:復(fù)旦大學(xué)出版社,2004:7.

        (收稿日期:2014-05-14 本文編輯:任 念)

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