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論文名稱 Title |
藥物m-3m3FBS與paroxetine對人類口腔癌細胞與狗腎臟細胞內鈣離子平衡及誘發細胞死亡機制之探討 The effect of m-3m3FBS and paroxetine on calcium homeostasis and viability in OC2 human oral cancer cells and canine MDCK renal tubular cells |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
147 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2011-05-24 |
繳交日期 Date of Submission |
2011-08-04 |
關鍵字 Keywords |
BAPTA、m-3M3FBS、腎臟MDCK細胞、口腔癌OC2細胞、鈣離子、細胞凋亡、細胞壞疽、tBHP、H2O2、caspase、paroxetine Necrosis, tBHP, H2O2, caspase, paroxetine, Apoptosis, OC2 cells, MDCK cells, m-3M3FBS, Ca2+, BAPTA |
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統計 Statistics |
本論文已被瀏覽 5693 次,被下載 995 次 The thesis/dissertation has been browsed 5693 times, has been downloaded 995 times. |
中文摘要 |
m-3M3FBS能夠刺激細胞內鈣離子濃度的上升,且細胞內鈣離子濃度的上升是經由PLC (Phosphoinositide-specific phospholipase C)的活化路徑來完成,由於PLC常常參與在各種不同細胞的細胞訊息傳遞反應過程中,因此這種刺激作用是否一樣適用於腎臟MDCK細胞以及口腔癌OC2細胞,仍未可知。所以我們將利用鈣離子敏感的螢光染料fura-2來探討m-3M3FBS對於腎臟MDCK細胞以及口腔癌OC2細胞活化PLC的分子機轉,以及PLC調節的細胞訊息傳遞的相關作用。我們發現0.1-20 μM m-3M3FBS會造成MDCK細胞內鈣離子濃度的上昇,而且細胞內鈣離子濃度會隨著藥物濃度的升高而上昇,然而在OC2細胞,m-3M3FBS的濃度須達到10-60 μM才會造成細胞內鈣離子濃度的上昇;當移除細胞外鈣離子,會稍微降低m-3M3FBS造成的細胞內鈣離子濃度上昇,表示細胞內鈣離子濃度的上昇有一部分是因為細胞外鈣離子的流入,而這種細胞外鈣離子的流入會受到鈣離子通道抑制劑nifedipine、econazole、SK&F96365以及phospholipase A2抑制劑aristolochic acid的影響。於無鈣溶液中,經由m-3M3FBS前處理的細胞,會完全抑制內質網鈣離子幫浦抑制劑(例如thapsigargin、cyclopiazonic acid 或者2,5-di-tert-butylhydroquinone (BHQ))引起之細胞內鈣離子上升,相反的,利用thapsigargin、cyclopiazonic acid 或者BHQ前處理的細胞,會部份抑制m-3M3FBS作用所引起之細胞內鈣離子上升,而且m-3M3FBS造成的細胞內鈣離子的釋放不會因為PLC的抑制劑U73122的作用而改變。總之,研究結果顯示,m-3M3FBS誘發MDCK和OC2細胞內鈣離子濃度的增加,是經由與PLC無關的內質網鈣離子通道釋放而來,以及store-operated鈣離子通道的流入,還有尚未確定發現的鈣離子通道所共同影響。除了鈣離子濃度的變化,我們發現m-3M3FBS濃度介於5至100 μM 時,其毒殺OC2細胞的能力與濃度呈正比,且細胞內鈣離子敖合劑1,2-bis(2-aminophenoxy)ethane- N,N,N',N'-tetraacetic acid (BAPTA) 並不會抑制m-3M3FBS的細胞毒殺效用。Propidium iodide螢光染色的流體細胞實驗測定發現20 μM及50 μM的m-3M3FBS會誘發與鈣離子無關的細胞凋亡。 由實驗的結果知道m-3M3FBS會誘發與鈣離子無關的細胞凋亡,但是這與其他人發表的研究結果有所不同,因此我們也有興趣得知細胞內鈣離子敖合劑BAPTA是否也能抑制氧化壓力造成的MDCK細胞的死亡,以及這樣的死亡過程是否與m-3M3FBS誘發與鈣離子無關的細胞凋亡相同。我們發現BAPTA能夠抑制tBHP和H2O2誘發的細胞死亡,而且BAPTA的濃度愈高抑制細胞死亡的效果愈好,因此我們推測tBHP和H2O2誘發的MDCK細胞死亡是與鈣離子相關的細胞死亡。接著我們利用2 μM U73122 (PLC抑制劑)、50 μM zVAD-fmk (caspase抑制劑)、2 μM cyclosporin A (MPTP抑制劑)、20 μM PD98059 (ERK抑制劑)、2 μM SP600125 (JNK抑制劑)…等,都沒有發現能夠抑制tBHP和H2O2誘發的MDCK細胞死亡,推測tBHP和H2O2誘發的MDCK細胞死亡並不是經由PLC, MPTP, caspase, ERK或者JNK的路徑。從propidium iodide螢光染色、caspase-3活性分析以及倒立顯微鏡下的細胞形態的結果讓我們認為tBHP和H2O2誘發的MDCK細胞死亡並不是走細胞凋亡的路徑,它比較像是細胞壞疽,而且是caspase無關、鈣離子相關的細胞死亡。 抗憂鬱藥物paroxetine對於人類口腔癌細胞OC2細胞內鈣離子細胞訊息傳遞的作用仍未可知,因此我們也利用鈣離子敏感的螢光染料fura-2來探討paroxetine對於口腔癌OC2細胞內調節鈣離子濃度的相關作用。我們發現100-1000 μM paroxetine會造成OC2細胞內鈣離子濃度的上昇,而且細胞內鈣離子濃度會隨著藥物濃度的升高而上昇;當移除細胞外鈣離子,會降低50%左右的paroxetine造成的細胞內鈣離子濃度上昇,表示細胞內鈣離子濃度的上昇有50%是因為細胞外鈣離子的流入,而這種細胞外鈣離子的流入會受到鈣離子通道抑制劑nifedipine、econazole、SK&F96365、phospholipase A2抑制劑aristolochic acid以及蛋白質激酶C的影響而被抑制。於無鈣溶液中,經由內質網鈣離子幫浦抑制劑thapsigargin前處理的細胞,會完全抑制paroxetine造成OC2細胞內鈣離子濃度上昇的作用,而且paroxetine造成的細胞內鈣離子的釋放不會因為PLC的抑制劑U73122的作用而改變。除了鈣離子濃度的變化,我們發現paroxetine濃度介於10至50 μM 時,其毒殺OC2細胞的能力與濃度呈正比,且細胞內鈣離子敖合劑BAPTA並不會抑制paroxetine的細胞毒殺效用。Propidium iodide螢光染色的流體細胞實驗測定發現paroxetine會誘發與鈣離子無關的細胞凋亡。總之,研究結果顯示,paroxetine誘發OC2細胞內鈣離子濃度的增加,是經由與PLC無關的內質網鈣離子通道釋放而來,以及phospholipase A2和蛋白質激酶C有關的store-operated鈣離子通道的流入,至於paroxetine造成的細胞死亡是與鈣離子無關的細胞凋亡作用。 |
Abstract |
The effect of 2,4,6-trimethyl-N-(meta-3-trifluoromethyl-phenyl)- benzenesulfonamide (m-3M3FBS), a presumed phospholipase C activator, on cytosolic free Ca2+ concentrations ([Ca2+]i) in Madin Darby canine kidney (MDCK) cells and OC2 human oral cancer cells was unclear. This study explored whether m-3M3FBS changed basal [Ca2+]i levels in suspended MDCK and OC2 cells by using fura-2 as a Ca2+-sensitive fluorescent dye. m-3M3FBS at concentrations between 0.1-20 μM increased [Ca2+]i in a concentration-dependent manner in MDCK cells, however in OC2 cells, m-3M3FBS at concentrations between 10-60 μM increased [Ca2+]i in a concentration-dependent manner. The Ca2+ signals were reduced partly by removing extracellular Ca2+ in the two cell types. m-3M3FBS-induced Ca2+ influx was inhibited by the store-operated Ca2+ channel blockers nifedipine, econazole and SK&F96365, and by the phospholipase A2 inhibitor aristolochic acid. In Ca2+-free medium, m-3M3FBS pretreatment abolished the [Ca2+]i rise induced by the endoplasmic reticulum Ca2+ pump inhibitors thapsigargin, cyclopiazonic acid or 2,5-di-tert-butylhydroquinone (BHQ). Conversely, pretreatment with thapsigargin, cyclopiazonic acid or BHQ partly reduced m-3M3FBS-induced [Ca2+]i rise. Inhibition of phospholipase C with U73122 did not alter m-3M3FBS-induced [Ca2+]i rise. Collectively, in MDCK and OC2 cells, m-3M3FBS induced [Ca2+]i rises by causing phospholipase C-independent Ca2+ release from the endoplasmic reticulum and Ca2+ influx via store-operated Ca2+ channels and other unidentified Ca2+ channels. Additionally, 5-100 μM of m-3M3FBS killed cells in a concentration-dependent manner in OC2 cells. The cytotoxic effect of m-3M3FBS was not reversed by prechelating cytosolic Ca2+ with 1,2-bis(2-aminophenoxy)ethane- N,N,N',N'-tetraacetic acid (BAPTA). Propidium iodide staining data suggest that m-3M3FBS (20 or 50 μM) induced apoptosis in a Ca2+-independent manner. We were also interested in knowing whether BAPTA suppressed cell death during oxidative stress in MDCK cells. BAPTA loading altered tBHP (tert-butyl hydroperoxide) and H2O2-induced cell death in a concentration-dependent manner. This suggests that the cell death induced by tBHP and H2O2 appears to be Ca2+-dependent in MDCK cells. The tBHP and H2O2-induced cell death was not suppressed by 2 μM U73122 (PLC inhibitor), 50 μM zVAD-fmk (caspase inhibitor), 2 μM cyclosporin A (a potent inhibitor of the MPTP), 20 μM PD98059 (ERK inhibitor) or 2 μM SP600125 (JNK inhibitor). This suggests that the tBHP and H2O2-induced MDCK cells death was not via the PLC, MPTP, caspase, ERK or JNK pathways. Propidium iodide staining, caspase-3 activity assay and cell morphology data suggest that tBHP and H2O2-induced cell death was necrosis, not via apoptosis, and the cell death appears to be caspase-independent and Ca2+-dependent. The effect of the antidepressant paroxetine on [Ca2+]i in OC2 human oral cancer cells is unclear. This study also explored whether paroxetine changed basal [Ca2+]i levels in suspended OC2 cells by using fura-2 as a Ca2+-sensitive fluorescent dye. Paroxetine at concentrations between 100-1000 μM increased [Ca2+]i in a concentration-dependent manner. The Ca2+ signal was reduced by 50% by removing extracellular Ca2+. Paroxetine-induced Ca2+ influx was inhibited by the store-operated Ca2+ channel blockers nifedipine, econazole and SK&F96365, the phospholipase A2 inhibitor aristolochic acid, and protein kinase C modulators. In Ca2+-free medium, pretreatment with the endoplasmic reticulum Ca2+ pump inhibitor thapsigargin abolished paroxetine–induced [Ca2+]i rise. Inhibition of PLC with U73122 did not alter paroxetine-induced [Ca2+]i rise. Paroxetine at 10-50 μM induced cell death in a concentration-dependent manner. The death was not reversed when cytosolic Ca2+ was chelated with BAPTA. Propidium iodide staining suggests that apoptosis played a role in the death. Collectively, in OC2 cells, paroxetine induced [Ca2+]i rise by causing PLC-independent Ca2+ release from the endoplasmic reticulum and Ca2+ influx via store-operated Ca2+ channels in a manner regulated by protein kinase C and phospholipase A2. Paroxetine also induced cell death in a Ca2+-independent manner. |
目次 Table of Contents |
學位論文審定書………………………..……………… i 誌謝…………………………………………………...... ii 中文摘要……………………………………………….. iii Abstract………………………………………………… v Contents…………………………………………........ viii List of figures…………………………………………… x List of abbreviations…………………………………… xii Chapter 1: Introduction………………………………… 1 Apoptosis…………………………………………… 1 Calcium homeostasis…………………………….. 6 Mitogen-activated protein kinases (MAPKs).…… 9 m-3M3FBS………………………………………..... 13 Reactive oxygen species (ROS)………………… 16 Paroxetine………………………………………… ..20 Specific aims...…………………………………….. 22 Chapter 2: Effect of m-3M3FBS on Ca2+ movement in MDCK and OC2 cells.……………………………….. 25 2.1 Introduction…………………………………… 25 2.2 Materials and methods…………………....... 27 2.3 Results………………………………………… 32 2.4 Discussion…………………………………….. 43 Chapter 3: Paroxetine-induced Ca2+ Movement and Death in OC2 Human Oral Cancer Cells………….. 54 3.1 Introduction…………………………………… 54 3.2 Materials and methods…………………….. 56 3.3 Results………………………………………… 60 3.4 Discussion………………………………….. 63 Chapter 4: Conclusions……………………............ 68 References…………………………………………… 72 Figures……………………………………………… 84 Publications and Presentations……………........ 116 Appendix 1: Effect of m-3M3FBS on Ca2+ movement in Madin-Darby canine renal tubular cells. Hum Exp Toxicol 2009; 28: 655-663. …..…………… 118 Appendix 2: Paroxetine-induced Ca2+ Movement and Death in OC2 Human Oral Cancer Cells. Chin J Physiol 2011; 54. In press.………………….......... 127 |
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