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dc.contributor.advisor劉秉慧zh_TW
dc.contributor.advisorBiing-Hui Liuen
dc.contributor.author陳洪韜zh_TW
dc.contributor.authorHong-Tao Chenen
dc.date.accessioned2024-09-06T16:31:50Z-
dc.date.available2026-03-29-
dc.date.copyright2024-09-06-
dc.date.issued2024-
dc.date.submitted2024-03-26-
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dc.identifier.urihttp://tdr.lib.ntu.edu.tw/jspui/handle/123456789/95433-
dc.description.abstract萊克多巴胺 (Ractopamine; RAC) 是一種β-腎上腺素受體促進劑 (β-adrenergic receptor agonists),通常用作飼料添加劑以調節牲畜新陳代謝,促進蛋白質合成進而提高牲畜的產肉率。過去研究指出,RAC的使用可能會導致家畜的行為和生理的異常變化,並且在水體中也發現多種類似的畜牧用藥汙染。由於脊椎動物斑馬魚具有體型小、生長週期短、繁殖力高、與人類基因組高度相似等優點,因此本研究利用斑馬魚的胚胎和成魚作為實驗模型,參考ADI (Acceptable daily intake)以及不確定性係數 (Uncertainty factor) 決定施用於斑馬魚的RAC濃度範圍,綜合進行RAC對於早期胚胎外型及心臟發育、幼魚運動行為能力與成魚生殖能力的安全性評估。

首先將2 hpf (hours post fertilization) 野生型斑馬魚胚胎以不同濃度RAC溶液暴露至72 hpf後取魚體組織進行直接競爭型酵素免疫分析法 (cdELISA),得知 RAC在組織內的蓄積作用濃度約為水中暴露濃度的15-20 %。以最高濃度RAC (2000 μg/L) 處理野生型斑馬魚胚胎至144 hpf,並未觀察到對幼魚形態、生存率和孵化率造成顯著的影響;此外RAC亦不會顯著改變心臟螢光魚Tg (BMP4: EGFP) 胚胎在72 hpf時心房、心室的截面積大小和靜脈竇-動脈球 (SV-BA) 的距離;但從心臟組織切片則發現高濃度RAC會顯著增加心包腔壁層的平均厚度。RAC處理亦會造成胚胎的心率和血液流速上升,並且具有劑量效應關係。觀察在高濃度RAC組別中144 hpf幼魚的泳動行為參數,其中平均泳速和自主泳動的占比時間都有顯著性提升。若以食品相關濃度RAC處理48 hpf胚胎進行RNA定序,分析得知有關啟動子轉錄調控、細胞內信號轉導、跨膜運輸和離子傳輸等生物功能亦會受到影響。

為了模擬人類口服攝入RAC之途徑,我們對成年斑馬魚連續進行14天RAC (100 x ADI 濃度) 的管餵實驗,犧牲成年斑馬魚所得到之肝體指數 (HSI) 和性腺指數 (GSI) 和對照組相比並沒有統計差異;性腺組織切片的結果則顯示接受RAC管餵斑馬雄魚的睪丸中精子所占的面積和雌魚卵巢中成熟卵細胞的數量皆出現明顯增加。此外檢視成魚管餵進行第五天和第十天後交配所產生的F1胚胎,發現其心血管功能和運動能力都和對照組F1相似。綜合以上結果,高濃度RAC (100 x ADI) 的暴露對於斑馬魚胚胎心臟功能、運動行爲和生殖功能可能會有程度不一的影響,需要更多研究數據進一步確認,以維護大眾及敏感族群之健康。
zh_TW
dc.description.abstractRactopamine (RAC) is a β-adrenergic receptor agonist commonly used as a feed additive to regulate the metabolism of livestock, promote protein synthesis, and then increase meat production efficiency. Previous studies have indicated that the use of RAC may lead to behavioral and physiological abnormalities in livestock, and various similar residues of veterinary drugs have also been found in aquatic environments. Due to the advantages of zebrafish, such as small size, short lifecycle, high reproductive capacity, and genomic similarity to humans, this study employs zebrafish embryos and adults as experimental models. The RAC concentrations applied to zebrafish were determined by referencing Acceptable Daily Intake (ADI) and Uncertainty factor values to comprehensively assess the safety of RAC on early embryo morphology, cardiac development, juvenile fish locomotor behavior, and adult reproductive capacity.

Wild-type zebrafish embryos at 2 hours post fertilization (hpf) were initially exposed to various doses of RAC solutions until 72 hpf, and the competitive direct enzyme-linked immunosorbent assay (cdELISA) was applied to examine the RAC levels in fish tissues. It was found that the accumulated effective concentration of RAC within tissues was approximately 15-20% of the exposure concentration in the water. Treatment of wild-type embryos with the highest concentration of RAC (2000 μg/L) until 144 hpf did not result in significant effects on juvenile morphology, survival rate, or hatching rate. Furthermore, RAC did not significantly alter the atria and ventricles' sizes or the distance between the Sinus venosus (SV) and Bulbus arteriosus (BA) in Tg (BMP4: EGFP) embryos at 72 hpf. However, tissue section analysis revealed a significant increase in the average thickness of the pericardial wall exposed to high RAC concentrations. RAC treatment also led to increased heart rate and blood flow velocity in embryos, exhibiting a dose-response relationship. Abnormal swimming behaviors were observed in 144 hpf larvae from the high RAC groups, with significantly increased average swimming speeds and percentages of active swimming time. Additionally, RNA sequencing of 48 hpf embryos treated with food-relevant concentrations of RAC revealed significant effects on promoter transcription regulation, intracellular signal transduction, transmembrane transport, and ion transport.

To simulate the ingestion of RAC in humans accurately, adult zebrafish were subjected to a continuous 14-day gavage experiment with RAC at 100 times the ADI concentration. Sacrificed adult zebrafish showed no statistically significant differences in Hepatosomatic index (HSI) and Gonadosomatic index (GSI) compared to the control group. However, analysis of gonadal tissue sections revealed that RAC gavage significant increased in the area occupied by sperm in the testes of male fish and in the number of mature egg cells in the ovaries of female fish. Moreover, F1 embryos produced by gavaged adult mating on the 5th and 10th days showed the cardiovascular function and locomotor ability similar to those of control F1 embryos.

In summary, exposure to high concentrations of RAC (100 times the ADI) may have varying degrees of effects on zebrafish embryo cardiac function, locomotor behavior, and reproductive function, necessitating further research to confirm and safeguard public and sensitive population health.
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dc.description.tableofcontents致謝 i
中文摘要 ii
英文摘要 (Abstract) iv
縮寫表 vi
第一章 緒論 (Introduction) 1
1.1 乙型促效劑 (β-agonists) 1
1.2 萊克多巴胺 (Ractopamine, RAC) 3
1.2.1 RAC的各國標準 3
1.2.2 RAC的環境流佈 4
1.2.3 RAC的心臟毒性 (Cardiotoxicity) 4
1.2.4 RAC的神經毒性 (Neurotoxicity) 5
1.2.5 RAC的生殖毒性 (Reproductive toxicity) 6
1.3 斑馬魚動物模式 (Zebrafish) 7
1.3.1 斑馬魚的簡介 7
1.3.2 斑馬魚的心臟發育 (Cardiac development) 8
1.3.3 斑馬魚的性腺發育 (Gonad development) 9
1.4 成年斑馬魚管餵 (Oral gavage) 10
1.5 研究動機與目的 (Motive and Objective) 12
第二章 材料與方法 (Materials and methods) 13
2.1 試驗品種及飼養 (Test species and husbandry) 13
2.2 實驗材料 (Materials) 14
2.2.1 化學藥品及試劑 (Chemicals and reagents) 14
2.2.2 儀器與器材 (Instruments and Equipment) 15
2.2.3 管餵與解剖用工具 (Oral gavage and Dissection tools) 16
2.3 胚胎毒素暴露 (Embryos toxin exposure) 17
2.4 成魚毒素暴露 (Adult toxin exposure) 18
2.5 實驗方法 (Methods) 19
2.5.1 心跳計數 (Heart rate count) 19
2.5.2 血液流速評估 (Blood flow rate assessment) 19
2.5.3 形態學觀察 (Morphological observation) 19
2.5.4 心臟發育觀察 (Development of Cardiac) 20
2.5.5 運動能力評估 (Locomotion) 20
2.5.6 直接競爭型酵素連結免疫吸附分析法 (Competitive direct enzyme-linked immunosorbent assay, cdELISA) 21
2.5.7 核糖核酸萃取 (RNA extraction) 22
2.5.8 RNA定序和生物資訊分析 (RNA sequencing and bioinformatic analysis) 22
2.5.9 反轉錄作用 (Reverse transcription reaction; RT reaction) 23
2.5.10 聚合酶連鎖反應 (Polymerase Chain Reaction, PCR) 23
2.5.11 即時定量聚合酶連鎖反應 (Real-Time PCR, qPCR) 24
2.5.12 石蠟組織切片 (Paraffin section) 24
2.5.13 組織染色 (Hematoxylin and eosin stain, H&E stain) 25
2.5.14 解剖方法 (Anatomical. methods) 25
2.6 統計分析 (Statistical. analysis) 26
第三章 結果 (Conclusion) 27
3.1 斑馬魚胚胎組織中的RAC含量 27
3.2 RAC處理後的斑馬魚形態 27
3.3 RAC對斑馬魚胚胎存活率及孵化率的影響 28
3.4 RAC對斑馬魚胚胎心臟形態影響 28
3.5 RAC對斑馬魚胚胎心臟組織學的影響 29
3.6 RAC促進斑馬魚胚胎心臟功能 29
3.7 RAC對斑馬魚幼魚的運動能力影響 30
3.8 RAC促進Tyrosine hydroxylase基因的mRNA表現量 30
3.9 以食品相關濃度RAC暴露斑馬魚胚胎的轉錄體學分析 31
3.10 由RNA定序結果探討RAC對發育相關基因的影響 31
3.11 管餵RAC對斑馬魚成魚生理及行為之影響 32
3.12 管餵RAC對斑馬魚性腺和肝臟外型及重量的影響 33
3.13 RAC對斑馬魚成魚性腺組織切片的影響 33
3.14 管餵RAC的子代效應 34
第四章 討論 (Discussion) 35
參考文獻 40
圖表 50
附錄 68
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dc.language.isozh_TW-
dc.subject萊克多巴胺zh_TW
dc.subject生殖安全性zh_TW
dc.subject管餵zh_TW
dc.subject斑馬魚zh_TW
dc.subject心血管安全性zh_TW
dc.subject行為安全性zh_TW
dc.subjectReproductive safetyen
dc.subjectRactopamineen
dc.subjectZebrafishen
dc.subjectCardiovascular safetyen
dc.subjectBehavioral safetyen
dc.subjectOral gavageen
dc.title萊克多巴胺在斑馬魚模型中的安全性探討zh_TW
dc.titleSafety evaluation of Ractopamine in zebrafish modelen
dc.typeThesis-
dc.date.schoolyear112-2-
dc.description.degree碩士-
dc.contributor.oralexamcommittee蕭崇德;陳佩貞;吳亭萱zh_TW
dc.contributor.oralexamcommitteeChung-Der Hsiao;Pei-Jen Chen;Ting-Shuan Wuen
dc.subject.keyword萊克多巴胺,斑馬魚,心血管安全性,行為安全性,管餵,生殖安全性,zh_TW
dc.subject.keywordRactopamine,Zebrafish,Cardiovascular safety,Behavioral safety,Oral gavage,Reproductive safety,en
dc.relation.page72-
dc.identifier.doi10.6342/NTU202400810-
dc.rights.note同意授權(限校園內公開)-
dc.date.accepted2024-03-27-
dc.contributor.author-college醫學院-
dc.contributor.author-dept毒理學研究所-
dc.date.embargo-lift2026-03-30-
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