多功能超聲造影劑顯像及治療腫瘤轉(zhuǎn)移淋巴結(jié)實驗研究
本文關(guān)鍵詞: 阿霉素 超順磁性氧化鐵 超聲造影劑 多功能 多功能造影劑 超聲 染料 淋巴結(jié) 巨噬細(xì)胞 阿霉素 超順磁性 超聲造影劑 多功能 轉(zhuǎn)移淋巴結(jié) 出處:《重慶醫(yī)科大學(xué)》2013年博士論文 論文類型:學(xué)位論文
【摘要】:目的分別制備兩種多功能超聲造影劑:載染料蘇丹黑B的聚乳酸羥基乙酸超聲微泡造影劑(SB-PLGA)和載阿霉素的超順磁性聚乳酸羥基乙酸超聲微泡造影劑(DOX-SPLGA),并檢測其一般特性。 方法采用雙乳化法和真空冷凍干燥法分別制備出SB-PLGA及不同鐵濃度的DOX-SPLGA,并對其進行粒徑,形態(tài),包封率等性質(zhì)檢測;其中對載藥微泡DOX-SPLGA還進行了體外釋藥實驗觀察,采用原子吸收分光光度計檢測造影劑的鐵含量;用振動樣品磁強計及磁共振儀檢測造影劑的磁學(xué)性質(zhì);體外超聲和磁共振顯像評價造影劑的顯像效果。 結(jié)果SB-PLGA外觀呈蓬松的藍(lán)色粉末狀,溶于水后為均勻的深藍(lán)色乳液,分散度好。掃描電鏡觀察微泡粒徑1~2μm,其形態(tài)規(guī)則,呈球形,表面光滑,大小均勻。馬爾文電位檢測其Zeta電位為(20.80±1.60)mV,SB的包封率為(85.67±1.44)%,載藥量為(3.43±0.06)%,分散度好。DOX-SPLGA外觀呈黃褐色粉末,溶于水后為均勻的乳液,分散度較好。掃描電鏡觀察微泡呈球形,表面有孔,大小較均勻,透射電鏡顯示微泡為殼核結(jié)構(gòu),SPIO納米顆粒分布于微泡的殼膜中。原子吸收光譜法得到7種不同鐵濃度制得的DOX-SPLGA中的鐵含量分別為(1.47±0.07)μg/ml(,2.83±0.08)μg/ml,(5.76±0.33)μg/ml(,14.77±0.32)μg/ml,(28.06±0.62)μg/ml,(56.71±0.44)μg/ml,(185.45±1.06)μg/ml,其相對應(yīng)的DOX的包封率分別為(58.10±1.61)%(,57.73±3.45)%,(60.30±2.67)%,(57.53±0.80)%,(61.13±0.95)%,(56.07±1.55)%,(59.60±1.61)%;DOX的載藥量分別為(5.81±0.16)%,(5.77±0.35)%,(6.03±0.27)%,(5.75±0.08)%,(6.11±0.10)%,(5.61±0.16)%,(5.96±0.16)%。造影劑的粒徑為800~900nm,具有超順磁性,其磁敏感效應(yīng)與殼膜中裝載的SPIO的含量有關(guān)。體外超聲顯像實驗顯示,DOX-SPLGA能夠較普通PLGA造影劑產(chǎn)生更強的超聲回聲。體外磁共振顯像實驗顯示,T2*信號隨著造影劑內(nèi)鐵濃度的增高而降低。 結(jié)論SB-PLGA造影劑為藍(lán)色粉末,粒徑均勻,分散好,為其之后既能外科手術(shù)前進行腫瘤轉(zhuǎn)移淋巴結(jié)內(nèi)超聲顯像,又能手術(shù)活檢時指示定位淋巴結(jié)提供了基礎(chǔ)。DOX-SPLGA造影劑具有形態(tài)規(guī)則,大小較均一,表面光滑有孔,分散均勻,超順磁性等優(yōu)點,在體外能夠增強超聲、磁共振顯像,同時能載藥輔助化療,是一種有應(yīng)用前景的多功能超聲造影劑。 目的探討SB-PLGA造影劑的細(xì)胞毒性及被巨噬細(xì)胞吞噬的能力;探討SB-PLGA造影劑對兔腫瘤轉(zhuǎn)移淋巴結(jié)的超聲顯像和手術(shù)示蹤效果,及其在淋巴結(jié)組織內(nèi)的分布情況。 方法體外培養(yǎng)小鼠單核巨噬細(xì)胞RAW264.7,加入同一濃度SB-PLGA造影劑孵育3h、24h和48h后,光鏡下觀察巨噬細(xì)胞對造影劑的吞噬情況,用MTT法檢測造影劑對巨噬細(xì)胞增殖活性的影響。采用瘤塊組織懸液種植法建立兔VX2乆窩腫瘤轉(zhuǎn)移淋巴結(jié)模型,建模后14天用于腫瘤淋巴結(jié)超聲顯像。選取腫瘤轉(zhuǎn)移淋巴結(jié)模型兔8只,共16個腫瘤淋巴結(jié)(實驗組8個,對照組8個),實驗組給予SB-PLGA造影劑,,對照組給予等量生理鹽水,分別經(jīng)足墊皮下間隙注射,行超聲造影檢查評價乆窩腫瘤轉(zhuǎn)移淋巴結(jié)及第二站腹股溝淋巴結(jié)的增強效果;并分別于30min后行乆窩和腹股溝淋巴結(jié)清掃術(shù),切除藍(lán)染及未染色淋巴結(jié),進行冰凍切片HE染色。 結(jié)果光鏡下觀察,巨噬細(xì)胞對SB-PLGA造影劑的吞噬量隨著造影劑與細(xì)胞孵育時間的增加而增加。MTT結(jié)果顯示,SB-PLGA造影劑被巨噬細(xì)胞吞噬后對其增殖活性無明顯影響。超聲造影可明顯增強兔乆窩腫瘤轉(zhuǎn)移淋巴結(jié)顯像,而同側(cè)腹股溝淋巴結(jié)及注射生理鹽水組顯像不明顯。乆窩淋巴結(jié)清掃術(shù)中可見,注射SB-PLGA造影劑組淋巴結(jié)染色效果好;而腹股溝淋巴結(jié)清掃術(shù)中均未見第二站淋巴結(jié)藍(lán)染。淋巴結(jié)冰凍切片HE染色可見,SB-PLGA存在于淋巴竇內(nèi),并有大量進入巨噬細(xì)胞。 結(jié)論SB-PLGA在體外能夠被巨噬細(xì)胞吞噬,且對細(xì)胞增殖活性無明顯影響。SB-PLGA能夠被淋巴結(jié)內(nèi)巨噬細(xì)胞吞噬,增強淋巴結(jié)超聲顯像,同時又能通過染色來指示定位淋巴結(jié),是一種良好的多功能超聲造影劑。 目的探討DOX-SPLGA造影劑對兔腫瘤轉(zhuǎn)移淋巴結(jié)的超聲和磁共振顯像效果;探討DOX-SPLGA造影劑聯(lián)合低頻超聲促進藥物釋放對兔腫瘤轉(zhuǎn)移淋巴結(jié)的治療效果。 方法新西蘭大白兔42只,采用瘤塊種植法于大腿外側(cè)植入VX2腫瘤組織塊懸液,建立兔乆窩腫瘤轉(zhuǎn)移淋巴結(jié)模型。建模后第15天,取12只模型兔(24個腫瘤淋巴結(jié)),隨機分為三組(每組8個腫瘤淋巴結(jié)),分別為DOX-SPLGA組(經(jīng)足墊皮下注射DOX-SPLGA微泡)、PLGA組(經(jīng)足墊皮下注射普通PLGA微泡)及對照組(經(jīng)足墊皮下注射等量生理鹽水),行超聲和磁共振掃描,并應(yīng)用圖像分析軟件評價造影效果。掃描結(jié)束后,取淋巴結(jié)組織進行HE染色和普魯士藍(lán)染色,以及透射電鏡檢查。建模后第15天,取30只模型兔(60個腫瘤淋巴結(jié)),隨機分為6組(每組10個腫瘤淋巴結(jié)),包括空白對照組(C)、載藥微泡(DOX-SPLGA)、單純藥物組(DOX)、單純微泡+超聲組(PLGA+US)、藥物+超聲組(DOX+US)、載藥微泡+超聲組(DOX-SPLGA+US)。治療后取腫瘤淋巴結(jié)組織,用免疫組化法檢測淋巴結(jié)組織PCNA、CD34及LYVE-1的表達;TUNEL法檢測淋巴結(jié)內(nèi)腫瘤細(xì)胞凋亡。 結(jié)果在超聲顯像的造影模式和傳統(tǒng)灰階模式下,與對照組相比,經(jīng)DOX-SPLGA與普通PLGA微泡造影后,乆窩淋巴結(jié)均可見回聲增強;且DOX-SPLGA組比普通PLGA組回聲更強。在磁共振顯像中,DOX-SPLGA組表現(xiàn)出明顯負(fù)性增強效果,普通PLGA組負(fù)性增強效果較弱,而對照組未見明顯增強。普魯士藍(lán)染色和透射電鏡結(jié)果均證實了DOX-SPLGA存在于淋巴結(jié)組織內(nèi)。免疫組化結(jié)果顯示,DOX-SPLGA+US組的凋亡指數(shù)(AI)顯著高于其它各組(P0.05);DOX-SPLGA+US組的腫瘤增殖受到明顯抑制,其增殖指數(shù)明顯低于其它各組(P0.05)。 結(jié)論DOX-SPLGA造影劑能顯著增強顯像超聲和磁共振兩種模式下的兔腫瘤轉(zhuǎn)移淋巴結(jié),同時聯(lián)合低頻超聲促進造影劑內(nèi)的藥物釋放,達到治療轉(zhuǎn)移淋巴結(jié)的效果,為尋求一種有效、安全、集顯像和治療
[Abstract]:Objective To prepare two kinds of multi - functional ultrasound contrast agents : the ultrasonic microbubble contrast agent ( SB - PLGA ) of poly ( lactic acid glycolic acid ) and the super - paramagnetic polylactic acid hydroxyacetic acid ultrasonic microbubble contrast agent ( GSPLGA ) loaded with adriamycin . Methods SB - PLGA and different iron concentrations were prepared by double emulsion method and vacuum freeze - drying method . The particle size , morphology , encapsulation efficiency and so on were tested . The magnetic properties of contrast agent were determined by using atomic absorption spectrophotometer . The magnetic properties of contrast agent were detected by vibrating sample magnetometer and magnetic resonance instrument , and the imaging effect of contrast agent was evaluated in vitro and magnetic resonance imaging . Results SB - PLGA appeared in a fluffy blue powder form , which was dissolved in water to form a homogeneous deep blue emulsion with good dispersion . The microvesicles were observed by scanning electron microscope . The entrapment efficiency of the microvesicles was ( 20.80 鹵 1.60 ) mV , ( 5.76 鹵 0 . 33 ) 渭g / ml , ( 56.71 鹵 0 . 44 ) 渭g / ml , ( 57.53 鹵 0 . 80 ) % , ( 61.13 鹵 0.95 ) % , ( 56.07 鹵 1.55 ) % , ( 59.60 鹵 1 . 61 ) % , respectively . The particle size of the contrast medium was 800 - 900nm , ( 5.61 鹵 0.16 ) % , ( 5.96 鹵 0.16 ) % , ( 5.61 鹵 0.16 ) % , ( 5.96 鹵 0.16 ) % . Conclusion The SB - PLGA contrast agent is a blue powder with uniform particle size and good dispersion . It has the advantages of regular morphology , uniform size , smooth surface , uniform distribution , super paramagnetism and so on . Objective To investigate the cytotoxicity of SB - PLGA contrast agent and the ability of macrophages to phagocytize the tumor , and to investigate the ultrasound imaging and surgical tracing effect of SB - PLGA contrast agent on the metastatic lymph node of rabbit tumor and its distribution in lymph node tissue . Methods Mouse mononuclear phagocytes RAW264.7 were cultured in vitro and incubated for 3 h , 24 h and 48 h with the same concentration of SB - PLGA contrast medium . The effect of contrast agent on the proliferation of macrophages was observed by MTT assay . Results The results showed that SB - PLGA contrast medium had no significant effect on the proliferation of SB - PLGA contrast medium . The results showed that SB - PLGA contrast media had no obvious effect on the proliferation activity of lymph node and injected physiological saline group . Conclusion SB - PLGA can be phagocytosed by macrophages in vitro and has no significant effect on cell proliferation activity . SB - PLGA can be phagocytosed by macrophages in lymph nodes , enhanced lymph node ultrasound imaging , and can be used to indicate the localization of lymph nodes by staining , which is a good multi - functional ultrasound contrast agent . Objective To investigate the ultrasound and magnetic resonance imaging of tumor metastasis lymph nodes in rabbits by using the contrast medium - SPLGA contrast agent , and to investigate the effect of the combination of the combined low - frequency ultrasound in the treatment of tumor metastasis lymph nodes in rabbits . Methods 42 model rabbits ( 24 tumor nodes ) were randomly divided into three groups ( 10 tumor nodes in each group ) , including blank control group ( C ) , drug - loaded microvesicle ( PLGA + US ) , drug + ultrasound group , drug + ultrasound group and drug - carrying microbubble + ultrasound group . The expression of PCNA , CD34 and LYVE - 1 in lymph nodes was detected by immunohistochemistry . Results Compared with the control group , the echogenic enhancement was observed in the lymph nodes of the common PLGA group compared with the control group . In the magnetic resonance imaging , there was a significant negative enhancement effect on the lymph nodes of the common PLGA group . The results of both blue staining and transmission electron microscopy showed that the apoptosis index ( AI ) of the common PLGA group was significantly higher than that in the other groups ( P0.05 ) . Conclusion The contrast agent can significantly enhance the metastatic lymph nodes of rabbit tumors in both the imaging and magnetic resonance modes . Meanwhile , the combination of low frequency ultrasound can promote the drug release in contrast agent , so as to achieve the effect of treating metastatic lymph node , and to seek an effective , safe , set imaging and treatment .
【學(xué)位授予單位】:重慶醫(yī)科大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2013
【分類號】:R730.55
【參考文獻】
相關(guān)期刊論文 前10條
1 鄧文靜;曾昭蕾;梁永鉅;戴春嶺;張建業(yè);符立梧;;高效液相色譜法檢測KB和KBv200細(xì)胞裸鼠移植瘤組織中阿霉素濃度[J];癌癥;2008年04期
2 楊榮平;涂永勤;張小梅;王賓豪;勵娜;;靶向給藥系統(tǒng)設(shè)計理論研究概述[J];重慶中草藥研究;2006年01期
3 吳元魁,許乙凱,張嘉寧,吳鳳林,劉杏元,黃其鎏;超順磁性氧化鐵增強MRI檢測轉(zhuǎn)移性淋巴結(jié)的實驗研究[J];第一軍醫(yī)大學(xué)學(xué)報;2003年01期
4 張超;鄧又斌;;諧波成像技術(shù)與微泡造影劑的發(fā)展現(xiàn)狀[J];放射學(xué)實踐;2006年09期
5 張龍江;祁吉;;分子影像學(xué)探針的研究與進展[J];國外醫(yī)學(xué)(臨床放射學(xué)分冊);2006年05期
6 崔明,范健;惡性腫瘤的淋巴靶向化療[J];國外醫(yī)學(xué)(腫瘤學(xué)分冊);2000年06期
7 李開智;李珍華;曾思恩;;淋巴管新生與腫瘤淋巴結(jié)轉(zhuǎn)移[J];華夏醫(yī)學(xué);2008年05期
8 冉海濤,任紅,王志剛,鄭元義,張群霞,李小東,許川山;包裹阿霉素的高分子材料微泡聲學(xué)造影劑制備及顯影效果實驗研究[J];臨床超聲醫(yī)學(xué)雜志;2005年04期
9 許川山;王志剛;;腫瘤的分子靶確認(rèn)與超聲納米分子影像學(xué)[J];臨床超聲醫(yī)學(xué)雜志;2006年04期
10 靳玉慎;柯亨特;戴志飛;;多功能超聲造影劑[J];化學(xué)進展;2012年12期
本文編號:1450906
本文鏈接:http://sikaile.net/yixuelunwen/yundongyixue/1450906.html