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        移植型和基因工程型乳腺癌動(dòng)物模型研究進(jìn)展

        2016-08-04 09:03:04程宇凌敖竹君
        關(guān)鍵詞:動(dòng)物模型乳腺癌

        程宇凌,敖竹君,2,陳 偉

        (1.遵義醫(yī)學(xué)院 組織胚胎學(xué)教研室,貴州 遵義 563099;2.曼尼托巴大學(xué)醫(yī)學(xué)院 微生物系人類逆轉(zhuǎn)錄病毒實(shí)驗(yàn)室,曼尼托巴 溫尼伯 R3T 2N2,加拿大)

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        綜述

        移植型和基因工程型乳腺癌動(dòng)物模型研究進(jìn)展

        程宇凌1,敖竹君1,2,陳偉1

        (1.遵義醫(yī)學(xué)院 組織胚胎學(xué)教研室,貴州 遵義563099;2.曼尼托巴大學(xué)醫(yī)學(xué)院 微生物系人類逆轉(zhuǎn)錄病毒實(shí)驗(yàn)室,曼尼托巴 溫尼伯R3T 2N2,加拿大)

        [摘要]乳腺癌是導(dǎo)致女性死亡的重要原因,其死亡率占女性惡性腫瘤死亡率的第2位,僅次于肺癌。因此尋求新的、有效的治療方法以防止腫瘤細(xì)胞的增殖及轉(zhuǎn)移,并闡明其潛在的分之機(jī)制,有助于降低癌癥患者的死亡率。乳腺癌小鼠模型是乳腺腫瘤學(xué)研究的基礎(chǔ)。乳腺癌動(dòng)物模型對(duì)研究乳腺癌的發(fā)生、發(fā)展及治療等方面具有重要作用。本文將介紹關(guān)于移植型和基因工程型小鼠乳腺癌模型在人類乳腺癌的應(yīng)用,并著重討論該兩種動(dòng)物模型系統(tǒng)的局限性和新的攻克方法。

        [關(guān)鍵詞]乳腺癌;動(dòng)物模型;移植型;基因工程型

        在世界范圍內(nèi),乳腺癌是最常見且嚴(yán)重危害女性身心健康的一種惡性腫瘤。其死亡率位居第二,僅次于肺癌,每年新發(fā)病例近1.4億[1-4]。近年來(lái),我國(guó)乳腺癌的發(fā)病率呈明顯上升趨勢(shì)[5]。每年我國(guó)女性乳腺癌發(fā)病例數(shù)達(dá)到16.9萬(wàn),占全球總發(fā)病數(shù)的12.25%,位列全球第二[6]。

        動(dòng)物模型是腫瘤學(xué)研究的基礎(chǔ),目前體外實(shí)驗(yàn)研究乳腺癌的生物學(xué)特性或探討新的治療方法,主要借助于已建立的乳腺癌傳代細(xì)胞株、移植型乳腺癌模型及基因工程小鼠[7]。在研究乳腺癌的輔助治療方法等方面,動(dòng)物模型比細(xì)胞株更具優(yōu)勢(shì),能更真實(shí)地反映體內(nèi)治療效果,對(duì)外推到臨床應(yīng)用更有參考價(jià)值。因此建立適當(dāng)?shù)娜橄侔﹦?dòng)物模型,是研究乳腺癌的生物學(xué)特性及臨床治療所必需。

        1乳腺癌動(dòng)物模型概述

        一個(gè)理想的動(dòng)物模型,首先應(yīng)與人體內(nèi)腫瘤病理生理過(guò)程相似,還要便于生產(chǎn)、觀察及對(duì)各種處理方法進(jìn)行監(jiān)測(cè)和優(yōu)選。根據(jù)制備方法和研究目的的不同,乳腺癌實(shí)驗(yàn)動(dòng)物模型可分為移植型、誘發(fā)型、自發(fā)型、基因敲除型及乳腺癌遠(yuǎn)處轉(zhuǎn)移等5大類。早期的腫瘤模型一般通過(guò)自發(fā)或誘發(fā)建立鼠源性腫瘤。自發(fā)型和誘發(fā)型動(dòng)物模型的主要局限性在于過(guò)程較長(zhǎng),成功率不高,個(gè)體差異性較大,不易同時(shí)獲得病程或腫塊大小均一的動(dòng)物模型,且與人瘤的生物學(xué)特性有較大差別,漸趨少用。相對(duì)而言,移植型動(dòng)物模型較好地克服了上述缺點(diǎn)。

        移植型模型因其周期短、成本低、個(gè)體差異小、成瘤率高、腫瘤生長(zhǎng)速度較為一致、易飼養(yǎng)等優(yōu)點(diǎn),已成為臨床應(yīng)用最廣的一種模型[8]。移植性模型是指將乳腺癌細(xì)胞或組織移植于實(shí)驗(yàn)動(dòng)物而培養(yǎng)出的模型,移植方式包括細(xì)胞懸液注射、組織塊懸液注射、腫瘤組織塊接種等。目前,常用的腫瘤種植方法是細(xì)胞懸液法和組織塊埋植法。組織塊埋植的實(shí)驗(yàn)周期更短,但細(xì)胞懸液法具有腫瘤形態(tài)規(guī)則、血管豐富,腫瘤內(nèi)壞死和表面潰瘍出現(xiàn)晚、性質(zhì)穩(wěn)定等優(yōu)點(diǎn),因此細(xì)胞懸液法更常用[9]。根據(jù)移植部位不同可分為原位移植和異位移植。原位移植即乳腺脂肪墊接種,異位移植常用的有皮下和尾部靜脈[7]。原位移植即在乳腺原位形成的腫瘤,并能通過(guò)轉(zhuǎn)移形成轉(zhuǎn)移瘤。尾部靜脈注射主要導(dǎo)致肺轉(zhuǎn)移[10]。此外,尾部靜脈注射還會(huì)引發(fā)肝轉(zhuǎn)移,且能借助循環(huán)系統(tǒng)傳達(dá)到更多的靶器官,例如骨[11]。

        由于動(dòng)物模型的供者和受者種屬和基因的不同,移植型模型可分為同基因型移植或異種移植。將一只小鼠身上的癌細(xì)胞移植到另一只小鼠身上時(shí),進(jìn)行的是同基因型移植,這樣就避免了因物種差異所造成的免疫排斥反應(yīng),并且同種移植的受體能為惡性腫瘤的增殖提供相同的免疫系統(tǒng)[12-13]。例如:4T1細(xì)胞來(lái)源于一只BALB/C的乳腺自發(fā)性腫瘤,當(dāng)在同基因型小鼠接種該細(xì)胞后,乳腺原位會(huì)迅速成瘤,隨后會(huì)向肺、肝、骨以及腦發(fā)生轉(zhuǎn)移[14-15]。

        為了更好地研究人乳腺癌細(xì)胞系體內(nèi)的增殖及轉(zhuǎn)移過(guò)程,我們可以進(jìn)行異種移植(Xenograft tumor model),即將人源的乳腺癌細(xì)胞系移植到免疫缺陷的小鼠體內(nèi),從而建立小鼠乳腺癌動(dòng)物模型[16]。例如:MDA-MB-231細(xì)胞系,該細(xì)胞系來(lái)源于一位乳腺癌病人的胸腔積液,雌激素受體陽(yáng)性,該細(xì)胞經(jīng)靜脈注射后,能轉(zhuǎn)移到骨、肝、肺、腎上腺、卵巢和腦[17]。接種已建立的乳腺癌細(xì)胞系相對(duì)簡(jiǎn)單。然而,異種移植同樣有缺點(diǎn),近年來(lái),基因工程小鼠(Genetically engineered mice)開始發(fā)展起來(lái)。該技術(shù)通過(guò)運(yùn)用基因敲除技術(shù),敲除某些腫瘤抑制因子,或通過(guò)轉(zhuǎn)基因插入某些已證實(shí)的癌基因來(lái)建立與人類腫瘤非常接近的小鼠乳腺癌動(dòng)物模型。

        乳腺癌不是單一的疾病,而是一組有不同組織類型、不同分子分型及不同預(yù)后的疾病,不能用單一動(dòng)物模型來(lái)研究此疾病[7]。接下來(lái)本文將對(duì)同種移植、異種移植及基因工程小鼠這3類乳腺癌模型的應(yīng)用做一綜述,為建立合適的乳腺癌動(dòng)物模型奠定基礎(chǔ)。

        2移植型乳腺癌動(dòng)物模型

        2.1同種移植目前已建立的鼠類乳腺癌細(xì)胞株有C127、4T1、TM40等,其中4T1和TM40兩種細(xì)胞株來(lái)源于近交系Balb/c小鼠。與TM40細(xì)胞株相比,4T1細(xì)胞株移植模型是目前臨床藥物篩選使用最多的1種乳腺癌模型。鼠源的4T1細(xì)胞來(lái)源于1983年1只小鼠的乳腺腫瘤[18-19],且雌激素表達(dá)陰性[14,20]。4T1細(xì)胞屬于三陰性乳腺癌[21],三陰性乳腺癌占全部乳腺癌的20%[22]。三陰性乳腺癌是乳腺癌治療中極具挑戰(zhàn)的一種亞型,與乳腺癌的其它亞型相比,三陰性乳腺癌缺乏與其它乳腺癌亞型共同的治療靶點(diǎn),且對(duì)細(xì)胞周期抑制藥阿霉素和紫杉醇存在抵抗作用[23-24]。女性三陰性乳腺癌的惡性程度較高,5年內(nèi)就伴有遠(yuǎn)處轉(zhuǎn)移結(jié)節(jié)[25]。三陰性乳腺癌的預(yù)后極差,其中的一個(gè)原因是目前還沒(méi)有找到能特異性抑制三陰性乳腺癌靶向轉(zhuǎn)移的治療方法[21]。

        4T1細(xì)胞移植模型的生長(zhǎng)和遠(yuǎn)處轉(zhuǎn)移與人類乳腺癌第四期非常相似[26]。4T1成瘤的一個(gè)優(yōu)點(diǎn)是使用免疫功能正常的小鼠。Balb/c小鼠共有5對(duì)乳腺[27],將1.0×106個(gè)/100 μL 4T1接種到6~8周齡的BALB/c小鼠乳腺脂肪墊處[28],4 d后在接種處便出現(xiàn)了腫瘤[29]。乳腺脂肪墊注射較乳頭及皮下注射的成瘤體積差異小,是一種非??煽康囊浦渤闪龇椒?,且第2對(duì)乳腺脂肪墊移植優(yōu)于第4對(duì)乳腺脂肪墊移植,因小鼠第2對(duì)乳腺與人乳腺有著相同的解剖部位,更能模仿人乳腺癌的發(fā)生和發(fā)展[30]。

        轉(zhuǎn)移癌即乳腺癌IV期是導(dǎo)致乳腺癌病人死亡的重要原因[31]。4T1細(xì)胞系有很強(qiáng)的遠(yuǎn)處轉(zhuǎn)移能力,類似人類自然發(fā)生的腫瘤,當(dāng)4T1細(xì)胞注射到小鼠體內(nèi)后能轉(zhuǎn)移到淋巴和肺等其他器官[32-33]。且當(dāng)Babl/c小鼠被誘發(fā)炎癥后,通過(guò)尾部靜脈注射4T1細(xì)胞,能使乳腺癌的肺轉(zhuǎn)移率增高[34]。該動(dòng)物模型和其它同種移植瘤模型一樣,已被成功運(yùn)用到了惡性腫瘤治療藥物的研究中[13,15,35-36]。

        2.2異種移植異種移植的方式很多,包括靜脈、腹腔內(nèi)、皮下以及原位接種,且這些接種方式能夠很好地監(jiān)測(cè)腫瘤成瘤及轉(zhuǎn)移過(guò)程,以及涉及人類有關(guān)基因的監(jiān)測(cè)。當(dāng)向免疫缺陷的小鼠接種人乳腺癌細(xì)胞后,原位能成瘤并能向遠(yuǎn)處靶器官轉(zhuǎn)移,這和乳腺癌病人的病程發(fā)展相似。人源的乳腺癌細(xì)胞系有很多,接下來(lái)將例舉幾種常見的乳腺癌細(xì)胞系(見表1)。

        表1幾種常見的異種移植乳腺癌細(xì)胞系

        細(xì)胞系腫瘤類型基因型移植部位細(xì)胞數(shù)轉(zhuǎn)移部位潛伏期(周)文獻(xiàn)MDA-MB-231腺癌基底樣型尾部靜脈2×105肺8~15[37]乳腺脂肪墊5×105~1×106肺、肝、腦5~9[37-38]心內(nèi)1×104~1×105腦、骨4[38]MCF-7浸潤(rùn)性導(dǎo)管癌管樣型乳腺脂肪墊1×106淋巴結(jié)、淋巴管1[39]MDA-MB-435侵入性導(dǎo)管癌基底樣型乳腺脂肪墊2×106肺9[40]MDA-MB-453腺癌管樣型乳腺脂肪墊1×105骨4[41]BT-474浸潤(rùn)性導(dǎo)管癌管樣癌心內(nèi)1×106骨4[42]

        2.2.1MCF-7乳腺癌移植型動(dòng)物模型MCF-7乳腺癌細(xì)胞系來(lái)源于1970年一位69歲患乳腺癌的白人婦女,該乳腺癌細(xì)胞系的ER陽(yáng)性[43],HER陽(yáng)性。據(jù)統(tǒng)計(jì),雌激素受體陽(yáng)性的乳腺癌占乳腺癌的70%[44]。歷時(shí)45年,該細(xì)胞系仍能穩(wěn)定傳代及表達(dá),因此常被運(yùn)用到乳腺癌體內(nèi)及體外的研究[45]。受某些生物學(xué)特性的影響,很多乳腺癌細(xì)胞株在小鼠模型上的成瘤率往往較低。一些研究在體外實(shí)驗(yàn)向體內(nèi)實(shí)驗(yàn)的過(guò)渡中,往往因此而增加工作量,甚至受到阻礙[46-47]。由于小鼠體內(nèi)的雌激素水平遠(yuǎn)低于人類,由此需向?qū)嶒?yàn)鼠體內(nèi)植入雌激素[48]。外源的雌激素能增加ER陽(yáng)性腫瘤的移植率[49],但高劑量雌激素植入裸鼠和SD大鼠會(huì)導(dǎo)致腎臟疾病,以及膀胱結(jié)石的形成[50]。低成本、低劑量的雌二醇能避免上述問(wèn)題的發(fā)生,并能協(xié)助MCF-7在免疫缺陷小鼠生長(zhǎng)到第6周[51]。此外,基質(zhì)膠(Matrigel)可以有效幫助哺乳動(dòng)物上皮細(xì)胞等各類細(xì)胞的附著和分化,因此,接種時(shí)加入基質(zhì)膠也能增加乳腺癌的成瘤率[52]。

        MCF-7建立裸小鼠乳腺癌原位移植瘤模型時(shí),自腫瘤細(xì)胞移植裸鼠腋下后,荷瘤裸小鼠在層流罩中存活、生長(zhǎng)良好,易于飼養(yǎng)。10 d左右肉眼可見成瘤,移植瘤成功率高,達(dá)到了100%,在接種后第20天,此時(shí)裸鼠開始消瘦,膚色變暗,出現(xiàn)晚期癌癥患者的惡質(zhì)化現(xiàn)象[53]。MCF-7細(xì)胞移植瘤鏡下癌細(xì)胞排列巢狀、團(tuán)索狀,癌細(xì)胞大小形態(tài)各異,胞漿豐富,細(xì)胞核大深染,核分裂象多見,腫瘤中央可見局灶壞死,符合乳腺癌組織細(xì)胞特征[54]。腫塊切除后行病理學(xué)切片檢查擬診為浸潤(rùn)性導(dǎo)管癌,ER檢測(cè)為陽(yáng)性表達(dá),說(shuō)明移植的腫瘤細(xì)胞保持了人乳腺癌腫瘤細(xì)胞的部分病理學(xué)特點(diǎn)[53]。

        2.2.2 MDA-MB-231乳腺癌移植型動(dòng)物模型人源乳腺癌細(xì)胞系MDA-MB-231雌激素受體陰性,且PR、HER均陰性,屬三陰性乳腺癌。MDA-MB-231細(xì)胞移植后,荷瘤裸小鼠在層流罩中存活、生長(zhǎng)良好,易于飼養(yǎng)。移植瘤成功率高,達(dá)到了100%,接種后14 d左右成瘤,移植瘤基本保持了人乳腺癌細(xì)胞的組織學(xué)特性,ER檢測(cè)為陰性表達(dá),說(shuō)明移植的腫瘤細(xì)胞保持了人乳腺癌腫瘤細(xì)胞的部分病理學(xué)特點(diǎn)[53]。然而,異種移植卻有著顯而易見的缺點(diǎn),首先,免疫反應(yīng)在腫瘤發(fā)展中具有關(guān)鍵作用,而所選的受體應(yīng)為免疫缺陷的小鼠[55];其次,人乳腺癌細(xì)胞系并非體內(nèi)真正的腫瘤,其僅僅是培養(yǎng)出來(lái)的細(xì)胞;再者,人的細(xì)胞顯然不能很好地適應(yīng)小鼠體內(nèi)的生長(zhǎng)環(huán)境。雖然許多腫瘤治療的方法已經(jīng)被運(yùn)用到小鼠動(dòng)物模型的研究當(dāng)中,然而仍然存在諸多未解決的副作用[56]。此外,還存在相當(dāng)大的技術(shù)問(wèn)題,由于細(xì)胞系的原因或接種方法的原因,將會(huì)導(dǎo)致轉(zhuǎn)移部位的變化[57]。這些差異就是導(dǎo)致為什么移植瘤不能在受體動(dòng)物體內(nèi)很好地展現(xiàn)腫瘤復(fù)雜過(guò)程的重要原因。

        3基因工程型乳腺癌動(dòng)物模型

        通過(guò)運(yùn)用基因敲除技術(shù),敲除某些腫瘤抑制因子,或通過(guò)轉(zhuǎn)基因插入某些已證實(shí)的癌基因來(lái)建立與人類腫瘤非常接近的小鼠乳腺癌動(dòng)物模型。許多啟動(dòng)子被運(yùn)用于驅(qū)使癌基因在乳腺的表達(dá),例如:小鼠乳腺腫瘤病毒(MMTV-LTR)、乳清酸性蛋白(WAP)等。許多已知的癌基因在啟動(dòng)子的作用或調(diào)節(jié)下,已在小鼠乳腺中得以表達(dá),形成乳腺癌并在晚期轉(zhuǎn)移到其他部位。這些癌基因包括表皮生長(zhǎng)因子受體2(ErbB2/Neu)、瘤中間T抗原(PyMT)、猿猴病毒40(SV40)T抗原、Harvery鼠肉瘤病毒ras基因(Ha-Ras)、Wnt-1蛋白因子、TGF-α和c-Myc。基因工程小鼠又可分為以下幾種類型。

        單一的轉(zhuǎn)基因小鼠:是小鼠在MMTV-LTR、WAP的控制下表達(dá)癌基因,從而引發(fā)乳腺原位癌,并在腫瘤的后期引發(fā)其它遠(yuǎn)處靶器官的轉(zhuǎn)移,如肺、淋巴結(jié)[58](見表2)。例如,MMTV-PyMT小鼠,轉(zhuǎn)基因小鼠短時(shí)間內(nèi)即在乳腺原位成瘤,且肺轉(zhuǎn)移率較高[59]。

        復(fù)合轉(zhuǎn)基因小鼠:將轉(zhuǎn)基因小鼠與其它基因工程小鼠聯(lián)合起來(lái),復(fù)合轉(zhuǎn)基因小鼠可用于腫瘤相關(guān)基因及其在腫瘤發(fā)生中的作用和轉(zhuǎn)移的研究(見表2)。例如MMTV-PyMT轉(zhuǎn)基因小鼠在合并CD44陰性(MMTV-PyMT;CD44-/-)時(shí)能促進(jìn)腫瘤轉(zhuǎn)移。因?yàn)镃D44是細(xì)胞附著力的受體,CD44能增加上皮基質(zhì)的相互作用,從而參與轉(zhuǎn)移抑制[60]。腫瘤相關(guān)免疫細(xì)胞,特別是巨噬細(xì)胞,在腫瘤細(xì)胞中占很大一部分,并且與腫瘤的不良預(yù)后密切相關(guān)。當(dāng)在致癌小鼠基因組中刪除集落刺激因子-1(MMTV-PyMT/ CSF-1-/-),腫瘤的增殖及轉(zhuǎn)移將明顯延遲。相反,過(guò)表達(dá)集落刺激因子-1將逆轉(zhuǎn)上述現(xiàn)象[61-63]。此外,通過(guò)刪除乳腺表皮的某些細(xì)胞,例如Trp53Brca1或Pten,能產(chǎn)生自發(fā)性腫瘤,并能轉(zhuǎn)移到骨以及導(dǎo)致ER的丟失,例如:MMTV-Cre;bRCALCO/CO;Trp53+/-復(fù)合轉(zhuǎn)基因小鼠[64-65]。

        誘導(dǎo)小鼠模型:控制癌基因的表達(dá)可以用類似于開-關(guān)的系統(tǒng)(Tet-On/Tet-Off system)來(lái)控制,而四環(huán)素在這個(gè)系統(tǒng)中起重要的誘導(dǎo)作用[66](見表2)。一種先進(jìn)的誘導(dǎo)系統(tǒng)對(duì)于研究癌基因之間的相互作用是非常有用的。轉(zhuǎn)基因小鼠MMTV-rtTA及tetO-myc的成瘤依賴四環(huán)素,當(dāng)成瘤后,去除四環(huán)素能降低myc的表達(dá),從而抑制腫瘤的生長(zhǎng)[67]。上述結(jié)果表明,已建立的誘導(dǎo)型小鼠模型能夠用于研究多種癌基因的突變、腫瘤的發(fā)生及轉(zhuǎn)移過(guò)程。

        然而,這些基因工程小鼠卻不能完全代替人類乳腺癌。首先,因方法的不同可能會(huì)導(dǎo)致產(chǎn)生不同的乳腺癌模型。其次,雖然基因工程小鼠的乳腺癌分子學(xué)類型與某些人乳腺癌類型相似(Luminal A、Luminal B、ERBB+、Basal-like和Normal breast-like),但單一的模型并不能代表人類乳腺癌的類型和特征[68]。

        表2幾種常見的基因工程小鼠

        基因工程小鼠原位癌成瘤率(%)潛伏期(周)轉(zhuǎn)移癌成瘤率(%)潛伏期(周)靶器官文獻(xiàn)MMTV-PyMT1004~885~10014肺、淋巴結(jié)[59]MMTV-Neu10028~337532肺[69]MMTV-NeuN10012~207514肺[70]MMTV-Wnt16032肺、淋巴結(jié)[71]WAP-Ras1002414肺[71]MMTV-PyMT;CD44-/100146614肺[60]MMTV-Cre;bRCALCO/CO;Trp53+/-10020~25肺、淋巴結(jié)[72]MMTV-rtTA;TetO-MYC8622[67]

        4展望

        動(dòng)物模型作為探索人類癌細(xì)胞特性及機(jī)制的重要工具,已被運(yùn)用到了各種各樣的癌基因以及抑癌基因的研究中,并在進(jìn)一步掌握腫瘤的發(fā)生及發(fā)展機(jī)制,以及對(duì)新的治療方法的研究有重要作用。但是,小鼠模型的運(yùn)用仍然存在缺陷。人和鼠腫瘤的發(fā)生是截然不同的,包括癌變動(dòng)力學(xué)和腫瘤增長(zhǎng)速度以及細(xì)胞的內(nèi)在特性,例如細(xì)胞增殖的微環(huán)境,以及免疫排斥反應(yīng)等。因此,目前很難將這些動(dòng)物模型直接運(yùn)用到病人的治療以及藥物的研究中。然而,我們相信,更先進(jìn)的小鼠模型的發(fā)展及建立將使人類更好地掌握腫瘤增殖及其轉(zhuǎn)移機(jī)制,從而研究出更有靶向性的抗癌藥物。

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        [收稿2016-04-28;修回2016-05-18]

        (編輯:王福軍)

        [基金項(xiàng)目]國(guó)家自然科學(xué)基金資助項(xiàng)目(NO:81460466)。

        [通信作者]陳偉,女,教授,碩士生導(dǎo)師,研究方向:生殖毒理與發(fā)育,E-mail:847428847@qq.com;敖竹君,女,博士,教授,研究方向:艾滋病致病機(jī)理、抗HIV-1 感染及治療策略方面研究,E-mail:ao_zhujun@hotmail.com。

        [中圖法分類號(hào)]R737.9

        [文獻(xiàn)標(biāo)志碼]A

        [文章編號(hào)]1000-2715(2016)03-0319-07

        Research progress of transplantation and gene engineering type animal models of breast cancer

        ChengYuling1,AoZhujun1,2,ChenWei1

        (1.Department of Histology and Embryology, Zunyi Medical University, Zunyi Guizhou 563099, China; 2.Laboratory of Molecular Human Retrovirology, Department of Medical Microbiology, Faculty of Medicine, University of Manitoba, Winnipeg Manitoba R3T 2N2, Canada)

        [Abstract]Breast cancer is the second leading cause of cancer death in women, exceeded only by lung cancer. Development of novel and effectual approaches to prevent tumor regression and metastasis and elucidation of their underlying molecular mechanisms help to reduce the death rates of cancer patients. Breast cancer mouse model is the basis of the study of oncology and allow us to investigate the occurrence, development and treatment of breast cancer. This article will introduce the application of transplantation and gene engineering-type animal models of mouse breast cancer in human breast cancer research, and focus on the limitations of the two animal models system and new methods to overcome the limitations.

        [Key words]breast cancer; animal model; transplantation type;gene engineering type

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