TWI588128B - 5-甲氧基色胺酸及其衍生物及其用途 - Google Patents
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- TWI588128B TWI588128B TW105100775A TW105100775A TWI588128B TW I588128 B TWI588128 B TW I588128B TW 105100775 A TW105100775 A TW 105100775A TW 105100775 A TW105100775 A TW 105100775A TW I588128 B TWI588128 B TW I588128B
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- A61K31/40—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
- A61K31/403—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil condensed with carbocyclic rings, e.g. carbazole
- A61K31/404—Indoles, e.g. pindolol
- A61K31/405—Indole-alkanecarboxylic acids; Derivatives thereof, e.g. tryptophan, indomethacin
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- A—HUMAN NECESSITIES
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Description
本發明係關於5-甲氧基色胺酸及其衍生物及其用途。更具體地,本發明係關於用於發炎類相關疾病及癌症之新穎5-甲氧基色胺酸及其衍生物及其用途。
先天免疫系統之異常活化涉及如膿毒性休克、多器官功能衰竭及動脈粥樣硬化之炎性病症發展。類鐸受體(Toll-like receptors,TLRs)在調節免疫反應及維持免疫穩態(immune homeostasis)中扮演關鍵角色。由病原體成分及內源性有害分子所起的TLR訊號不當活性化對如膿毒症(sepsis)之全身性發炎症而言為主要因素。越來越多證據表明TLR在全身性發炎症和膿毒症期間,針對侵入的病原體調控全身反應中扮演關鍵作用。具體而言,由LPS所起的TLR4活化被認為是膿毒症中發炎反應之重要起因。除了LPS,TLR4亦可通過內源性分子活化,如高遷移性族蛋白1(high mobility group box 1,HMGB1),為致命性膿毒症之晚期調節子,其接連引發二級免疫刺激級聯(cascade)。全身性發炎性反應症候群最普遍由革蘭氏陰性菌之全身性感染及隨後LPS釋放所引起,釋放的LPS活化TLR4訊號。LPS所引起宿主免疫系統的過度刺激導致循環作用中的大量發炎性細胞素及瀰漫性血管內凝血。
全身性發炎症的特徵是代謝症候群、心血管代償失調、多器官衰竭、瀰漫性血管內凝血和休克。這些臨床表現是由於因非包容細菌感染(uncontained bacterial infection)和革蘭氏陰性菌產生的內毒素(特別是脂多醣(LPS))所致不適當或延伸的發炎反應所產生的。過度免疫反應導致產生非常大量的促發炎細胞素(細胞素風暴)及過度表現的促發炎調節子(如環氧合酶(cyclooxygenese,COX-2)及誘導型一氧化氮合成酶(inducible nitric oxide synthase,iNOS))。全身性發炎類反應綜合症之治療受限於流體給藥、氧氣補充、抗生素及其他支持性措施。針對促炎細胞素、凝血級聯反應、LPS和免疫反應的具體治療方法是不成功的或有些微療效。
先天免疫系統異常活化及所致的慢性發炎已知涉及慢性及代謝性疾病之發展及惡化,包含動脈粥樣硬化(Hansson GK & Hermansson A.The immune system in atherosclerosis.Nat Immunol 12:204-212(2011))。大量證據表明感染劑有助於心血管疾病。血管損傷常常是因無法控制的感染伴隨內毒素(特別是LPS)釋放所引起的。LPS活化類鐸受體4(TLR4),其傳遞訊號以活化NF-κ B及C/EBP,導致促炎調節子過度產生,從而誘導內皮及血管損傷。除了LPS,TLR4亦可通過內源性分子活性化,如高遷移性族蛋白1(HMGB1),為發炎性晚期調節子,影響動脈粥樣硬化發展。受到牙齦卟啉單胞菌(Porphyromonas gingivalis)感染的ApoE剔除(ApoE-knockout)小鼠不僅加速動脈粥樣硬化也增加了TLR2及TLR4的表現。血管疾病是公認的發炎性疾病一發炎活化內皮和底層內側的血管平滑肌細胞(Hansson GK.Inflammation,atherosclerosis,and coronary artery disease.N Engl J Med 352,1685-95(2005))。致病VSMC遷移和增殖(導致動脈硬化)有些類似於全身性發炎症以及癌細胞的生長和侵入。我們假設5-MTP可能防止血管損傷
引起的發炎和隨後的內皮功能障礙和血管平滑肌細胞增殖和遷移,和隨之而來的新生內膜形成。
因此,希望提供一種新的治療試劑及方法來克服上述的嚴重人類疾病。
本發明基於發現特定5-甲氧基色胺酸及其衍生物可用作抗發炎疾病及抗癌試劑。因此,本發明之一目的在於提供5-甲氧基色胺酸及其衍生物及使用其治療發炎類相關疾病及癌症之方法。
本發明之一態樣有關於如式(I)之化合物:
在此式中,R1為H、鹵素原子、C1-C10烷基、C2-C10烯基、C2-C10炔基、C3-C20環烷基、或C3-C20環烯基;R2為C1-C10烷基、C2-C10烯基、C2-C10炔基、C3-C20環烷基、或C3-C20環烯基;R3為H、C1-C10烷基、C2-C10烯基、C2-C10炔基、C3-C20環烷基、或C3-C20環烯基;R4為H、C1-C10烷基、C2-C10烯基、C2-C10炔基、C3-C20環烷基、C3-C20環烯基、C(O)Ra、或C(O)ORa;其中Ra為H、C1-C10烷基、C3-C20環烷基、C3-C20雜環烷基、芳基、或雜芳基;R5為H、C1-C10烷基、C3-C20環烷基、C3-C20雜環烷基、芳基、或雜芳基;以及n為0-5。
前述化合物之一次態樣包括5-甲氧基色胺酸及其衍生物,其中,每一R1及R2各自獨立為H或C1-C10烷基。在這些化合物中,R1較佳為H,且R2較佳為C1-C3烷基。
前述化合物之另一次態樣包括5-甲氧基色胺酸及其衍生物,其中,R3為H、C1-C10烷基,且R4為H、C1-C10烷基、C(O)Ra、或C(O)ORa,其中Ra為H或C1-C10烷基。在這些化合物中,R3較佳為H,且R4較佳為H或C(O)Ra,且Ra為C1-C3烷基。
前述化合物之另一次態樣包括5-甲氧基色胺酸及其衍生物,其中,R5為H或C1-C10烷基。在這些化合物中,R5較佳為H或C1-C3烷基。
前述化合物之另一次態樣包括5-甲氧基色胺酸及其衍生物,其中,n為1或2。
術語「烷基」意指一飽和、直鏈或支鏈碳氫基團,如-CH3或-CH(CH3)2。烷基的例子包括但不限於:甲基、乙基、正丙基、異丙基、正丁基、異丁基及叔丁基。術語「烯基」意指直鏈或支鏈的含有至少一雙鍵之碳氫基團,如-CH=CH-CH3。烯基的例子包括但不限於:乙烯基、丙烯基、伸丙烯基、烯丙基及1,4-丁二烯基。術語「炔基」意指直鏈或支鏈的含有至少一三鍵之碳氫基團,如-C≡C-CH3。炔基的例子包括但不限於:乙炔基、伸乙炔基、1-丙炔基、1-丁炔、2-丁炔及1-甲基-2-丁炔。術語「環烷基」意指一飽和環碳氫基團。環烷基的例子包括但不限於:環丙烷基、環丁烷基、環戊烷基、環戊烯基、環己烷基、環己烯基、環庚烷基及環辛烷基。術語「環烯基」意指非芳香性的含有至少一雙鍵之環碳氫基團。術語「雜環烷基」意指一飽和且具有至少一環雜原子(如N、O或S)之環基團。雜環烷基的例子包括但不限於:哌嗪基(piperazinyl)、吡咯烷基(pyrrolidinyl)、二惡烷基(dioxanyl)、嗎啉基(morpholinyl)及四氫呋喃基(tetrahydrofuranyl)。術語「芳基」意指具有一個以上芳香環之碳氫基團。芳基的例子包括苯基(phenyl,Ph)、亞苯基(phenylene)、萘基(naphthyl)、亞萘基
(naphthylene)、芘基(pyrenyl)、蒽基(anthryl)及菲基(phenanthryl)。術語「雜芳基」意指具有一個以上含有至少一雜原子(如N、O或S)之芳香環的基團。雜芳基基團的例子包括呋喃基(furyl)、亞呋喃基(furylene)、芴基(fluorenyl)、吡咯基(pyrrolyl)、噻吩基(thienyl)、噁唑基(oxazolyl)、咪唑基(imidazolyl)、噻唑基(thiazolyl)、吡啶基(pyridyl)、嘧啶基(pyrimidinyl)、喹唑啉基(quinazolinyl)、喹啉基(quinolyl)、異喹啉基(isoquinolyl)及吲哚基(indoly)。術語「鹵素原子」意指F、Cl、Br或I。
除非另有所指,在此所述之烷基、烯基、炔基、環烷基、環烯基、雜環烷基、芳基及雜芳基包括飽和及不飽和基團兩者。在環烷基、環烯基、雜環烷基、芳基及雜芳基上的可能取代基包括但不限於:C1-C10烷基、C2-C10烯基、C2-C10炔基、C3-C20環烷基、C3-C20環烯基、C1-C20雜環烷基、C1-C20雜環烯基、C1-C10烷氧基、芳基、芳氧基、雜芳基、雜芳氧基、胺基、C1-C10烷胺基、C1-C20二烷胺基、芳胺基、二芳胺基、C1-C10烷基磺醯胺基、芳基磺醯胺基、C1-C10烷亞胺基、芳亞胺基、C1-C10烷基磺醯亞胺基、芳基磺醯亞胺基、羥基、鹵基、硫基、C1-C10烷硫基、芳硫基、C1-C10烷基磺醯基、芳基磺醯基、醯胺基、胺醯基、胺基硫代醯基、醯胺基(amido)、甲脒基(amidino)、胍基(guanidine)、脲基(ureido)、硫脲基(thioureido)、氰基、硝基、亞硝基、疊氮基(azido)、醯基(acyl)、硫醯基(thioacyl)、醯氧基(acyloxy)、羧基(carboxyl)及羧酸酯基(carboxylic ester)。另一方面,烷基、烯基或炔基上可能的取代基包含上述除了C1-C10烷基之外的所有取代基。環烷基、環烯基、雜環烷基、雜環烯基、芳基及雜芳基也可彼此稠合。
在應用上,上述化合物包括化合物自身、其鹽類、其溶劑化物及其前驅藥。舉例而言,鹽類可由一陰離子及5-甲氧基色胺酸及其衍生物上的正價基團(如胺基)形成。適當的陰離子包括氯離子、溴離子、碘離子、硫酸根、硝酸
根、磷酸根、檸檬酸根、甲磺酸根、三氟乙酸根、醋酸根、蘋果酸根、甲苯磺酸根、酒石酸根、富馬酸根、谷氨酸根、葡醣醛酸根、乳酸根、戊二酸根及馬來酸根。類似地,鹽類亦可由一陽離子及5-甲氧基色胺酸及其衍生物上的負價基團(如羧酸根)形成。適當的陽離子包括鈉離子、鉀離子、鎂離子、鈣離子及銨陽離子(如四甲基氫氧化銨離子(tetramethylammonium ion))。化合物亦包括含有四級氮原子之鹽類。前驅藥的例子包括酯類及其他醫藥可接受衍生物,其對患者施用時,能提供上述活性化合物。溶劑化物意指由活性5-甲氧基色胺酸或其衍生物與醫藥可接受溶劑形成的複合物。醫藥可接受溶劑的例子包括水、乙醇、異丙醇、乙酸乙酯、醋酸及乙醇胺。
前述化合物之一次態樣包括5-甲氧基色胺酸衍生物,當R2為C1-C10烷基,R1、R3、R4及R5不為H。
於另一態樣中,本發明提供一種用以治療發炎類相關疾病之方法。該方法包括對一有需要之患者施用有效劑量之一種以上如前述式(I)化合物。發炎類相關疾病的例子包括膿毒症(sepsis)、全身性紅斑狼瘡(Systemic Lupus Erythematosus,SLE)、心血管疾病(cardiovascular diseases)、代謝症候群(metabolic syndrome)、癌症,敗血症(septicemia)和多樣性發炎關節(diverse inflammatory joint)、胃腸道(gastrointestinal)和腎臟(renal)疾病。
於又一態樣中,本發明亦提供一種癌症之治療方法。該方法包括對一有需要之患者施用有效劑量之一種以上如前述式(I)化合物。能被本發明方法治療之癌症包括各種器官之固態腫瘤及血液腫瘤。固態腫瘤的例子包括胰腺癌(pancreatic cancer)、膀胱癌(bladder cancer,例如上皮癌(urothelium cancer))、結直腸癌(colorectal cancer)、乳腺癌(breast cancer,例如轉移性乳腺癌(metastatic
breast cancer))、男性生殖道癌(male genital tract cancer,例如精囊癌(seminal vesicle cancer)、睾丸癌(testes cancer)、生殖細胞腫瘤(germ cell tumors)和前列腺癌(prostate cancer,如雄激素依賴性和雄激素非依賴性前列腺癌(androgen-dependent and androgen-independent prostate cancer)))、腎癌(renal cancer,例如轉移性腎細胞癌(metastatic renal cell carcinoma))、肝細胞癌(hepatocellular cancer)、肺癌(lung cancer,例如小細胞肺癌(mall cell lung cancer)、非小細胞肺癌(non-small cell lung cancer)、細支氣管肺泡癌(bronchioloalveolar carcinoma)和腺癌肺(adenocarcinoma of the lung))、卵巢癌(ovarian cancer,例如逐行上皮或原發性腹膜癌(progressive epithelial or primary peritoneal cancer)),子宮頸癌(cervical cancer)、子宮癌(uterus cancer)、妊娠滋養細胞疾病(gestational trophoblastic disease,例如絨毛膜癌(choriocarcinoma))、胃癌(gastric cancer)、膽道癌(bile duct cancer)、膽囊癌(gallbladder cancer)、小腸癌(small intestine cancer)、食管癌(esophageal cancer)、口咽癌(oropharyngeal cancer)、下嚥癌(hypopharyngeal cancer)、眼癌(eye cancer,例如視網膜母細胞瘤(retinoblastoma)、神經癌(nerve cancer,例如神經鞘瘤(Schwannoma)、腦膜瘤(meningioma)、神經母細胞瘤(neuroblastoma)及神經瘤(and neuroma))、頭頸部癌症(head and neck cancer,例如頭部和頸部的鱗狀細胞癌(squamous cell carcinoma of the head and neck))、黑素瘤(melanoma)、漿細胞瘤(plasmacytoma)、內分泌腺腫瘤(endocrine gland neoplasm,如垂體腺瘤(pituitary adenoma)、甲狀腺癌(thyroid cancer)和腎上腺瘤(adrenal tumor))、神經內分泌癌(neuroendocrine cancer,例如轉移性神經內分泌腫瘤(metastatic neuroendocrine tumors))、腦腫瘤(brain tumors,例如神經膠質瘤(glioma)、間變性少突神經膠質瘤(anaplastic oligodendroglioma)、膠質母細胞瘤(glioblastoma multiforme)和星形
細胞瘤(astrocytoma,如成人間變性星形細胞瘤(adult anaplastic astrocytoma)))、骨癌(bone cancer)、和從軟組織或骨肉瘤(sarcomas from soft tissue or bone,例如卡波濟氏肉瘤(Kaposi's sarcoma))。血液惡性腫瘤的例子包括急性骨髓性白血病(acute myeloid leukemia)、綠色白血病(chloroma)、慢性骨髓性白血病(chronic myelogenous leukemia)或慢性粒細胞白血病(CML)(例如加速CML(accelerated CML)和CML急性期(CML blast phase))、急性淋巴細胞性白血病(acute lymphoblastic leukemia)、慢性淋巴細胞白血病(chronic lymphocytic leukemia)、霍奇金病(Hodgkin’s disease)、非霍奇金淋巴瘤(non-Hodgkin’s lymphoma,例如濾泡性淋巴瘤(follicular lymphoma)、皮膚T細胞淋巴瘤(cutaneous T-cell lymphoma,如蕈樣肉芽腫(mycosis fungoides)和套細胞淋巴瘤(mantle cell lymphoma))、B細胞淋巴瘤(B-cell lymphoma)、多發性骨髓瘤(multiple myeloma)、瓦爾登斯特倫巨球蛋白血症(Waldenstrom’s macroglobulinemia)、骨髓增生異常綜合徵(myelodysplastic syndromes,例如難治性貧血(refractory anemia)、難治性貧血伴環狀鐵粒幼紅細胞(refractory anemia with ringed siderblasts)、難治性貧血伴原始細胞過多(refractory anemia with excess blasts)或RAEB、及RAEB轉化或RAEB-T和骨髓增生症候群(myeloproliferative syndromes))。
術語「治療」意指對一具有前述疾病、此疾病症狀或患病傾向的患者施用一種以上之5-甲氧基色胺酸及其衍生物,以賦予治療效果的目的,如治癒、緩解、改變、影響、改善(ameliorate)或預防上述疾病、其症狀或患病傾向。
術語「有效劑量」意指賦予被治療的患者治療效果所需的5-甲氧基色胺酸或其衍生物之含量。視治療的疾病類型、給藥的路徑、賦形劑的使用
及其他共同使用的試劑的可能性,所屬技術領域具有通常知識者可確認並變化有效劑量。
再者,用於治療上述疾病及癌症之一者之含有上述一種以上5-甲氧基色胺酸及其衍生物之醫藥組成物,以及此組成物用以製造治療藥物之用途亦在本發明之範疇中。
本發明示例型5-甲氧基色胺酸及其衍生物如下所示:
其中,5-MTP意指5-甲氧基色胺酸(5-methoxytryptophan);5-MTPE意指酯化5-MTP;以及NACT-5MTP意指N-乙醯-5-MTP(N-acetyl-5-MTP)。
本發明其他目的、優點及新穎特徵將在結合隨附圖式時,從以下詳細描述中變得更為清楚。
圖1A為本發明5-MTP及其衍生物之結構。
圖1B為5-MTPE之薄層色層分析及質譜結果。
圖1C至1E為5-MTP及其衍生物(5-MTP及NACT-5MTP)之HNMR頻譜。
圖1F為5-MTP及其衍生物於PMA誘導A549 COX-2表現中的抑制活性結果。
圖2A為A549肺癌細胞經5-MTP或5-MTPE處理之細胞遷移分析結果。
圖2B為BT474及T47D乳癌細胞經5-MTPE處理之細胞遷移分析結果。
圖2C為經5-MTP或5-MTPE處理之腫瘤異種移植試驗結果,其中*表示p<0.05,**表示p<0.01。
圖3A至3F分別為5-MTP對LPS誘導表現COX-2及不同細胞素之抑制性。
圖4A及4B為5-MTPE在細胞活性及IL-6製造上的效果。
圖5A為注射或不注射5-MTP或5-MTPE後以LPS刺激的小鼠存活率。
圖5B為盲腸結紮穿孔(CLP)手術後30分鐘注射或不注射5-MTP的小鼠存活率。
圖5C為5-MTP對經LPS刺激小鼠的抑制性。
圖5D為支氣管肺泡灌洗液(BALF)結果。
圖6A至6B為5-MTP對LPS誘導表現COX-2及iNOS之抑制性。
圖7A至7D分別為在經5-MTP處理或不經5-MTP處理的小鼠中不同的促炎細胞素含量。
圖7E為在經5-MTP處理或不經5-MTP處理的腹腔巨噬細胞中促炎細胞素含量。
圖7F為在經5-MTP處理或不經5-MTP處理下經生理食鹽水或LPS處理的小鼠中的血清5-MTP含量。
圖8A為5-MTP在中性白血球浸潤上的抑制性。
圖8B為在經5-MTP處理或不經5-MTP處理下經生理食鹽水或LPS處理的小鼠的肺組織中的MPO活性。
圖8C為在經5-MTP處理或不經5-MTP處理下經生理食鹽水或LPS處理的小鼠中的血清趨化素含量。
圖9A為在經5-MTP處理或不經5-MTP處理下經生理食鹽水或LPS處理的小鼠的肺組織中的活化胱天蛋白酶-3(caspase-3)含量。
圖9B為在經5-MTP處理或不經5-MTP處理下經生理食鹽水或LPS處理的小鼠的脾臟細胞中的活化胱天蛋白酶-3含量。
圖9C為經5-MTP處理或不經5-MTP處理的經LPS誘導小鼠的脾臟重量/體重比。
圖10A為在經5-MTP處理或不經5-MTP處理的RAW264.7細胞中的p38、磷酸化-p38(p-p38)、ERK1/2、磷酸化-ERK1/2(p-ERK1/2)或β-肌動蛋白之免疫墨點結果。
圖10B為在經5-MTP處理或不經5-MTP處理的RAW264.7細胞中的NF-κB啟動子活性。
圖10C為在經5-MTP處理或不經5-MTP處理的RAW264.7細胞中的NF-κB p65、磷酸化-NF-κB p65(p-p65)(Ser536)或β-肌動蛋白之免疫墨點結果。
圖10D為在經5-MTP處理或不經5-MTP處理下經LPS處理的腹腔巨噬細胞裂解物(lysates)中的磷酸化-p65含量。
圖10E為在經5-MTP處理或不經5-MTP處理下經LPS注射後小鼠肺組織中的磷酸化-p65含量。
圖10F為在5-MTP存在或不存在的情況下以LPS處理之腹腔巨噬細胞中的p300 HAT活性。
圖10G為在5-MTP存在或不存在的情況下以LPS處理之小鼠肺組織中的p300 HAT活性。
圖10H為通過5-MTP抑制全身性發炎症候群的訊號機制示意圖。
圖11A至11B為在LPS處理後經5-MTP、5-MTPE、COX-2抑制劑(NSC398或SC560)及NF-κB抑制劑(JSH-23)處理之RAW264.7細胞培養上清液中的IL-6含量。
圖11C為RAW264.7細胞經COX-2啟動子-螢光素酶質體轉染後之螢光素酶活性。
圖12A為透過競爭性5-MTP ELISA測量之具有冠狀動脈疾病(CAD)之患者及健康受試者之血清5-MTP濃度(n=50)。
圖12B為5-MTP在以高脂肪飲食治療的ApoE缺陷型小鼠之動脈中對脂質累積及動脈粥樣硬化病變形成之抑制性。
圖12C為5-MTPE在以高脂肪飲食治療的ApoE缺陷型小鼠之動脈粥樣硬化病變中對脂質累積之抑制性。
圖12D為5-MTP及5-MTPE對血管平滑肌細胞於鈣化培養基誘導鈣化中的抑制效果。
圖12E為5-MTP在ApoE缺陷型小鼠中對高脂肪飲食誘導的血管鈣化抑制性。
圖13為在結紮小鼠頸動脈之內膜增生上5-MTP之衰減現象;血管截面以H&E染色(A,B)或對彈性蛋白(黑)以維爾赫夫氏染色(C,D);(E)為在結紮頸動脈中的內膜區域之型態分析量化圖;相較於載劑處理小鼠(0.96±0.19,n=9),5-MTP降低內膜/中膜面積比至0.58±0.11(n=12;*P<0.05 vs.載劑組)。
[5-MTP及其衍生物之合成]
使用由ASTATECH(PA,USA)提供的合成5-MTP,作為用於如合成流程圖所示5-MTP衍生物合成之材料;5-MTP及其衍生物之結構如圖1A所示。
實驗流程:
合成步驟1:
於10℃下,將33%的二甲基胺水溶液緩慢滴入AcOH,同時控制內部溫度低於20℃,緩慢加入40%的甲醛水溶液。
於10℃下,將5-甲氧基吲哚(5-methoxyindole)分批加入上述溶液中,並在30℃下攪拌過夜。TLC顯示起始材料5-甲氧基吲哚被消耗。在10℃下,以1N NaOH水溶液校正至pH>9,以MTBE萃取5次,以鹽水洗滌集合的有機相,以Na2SO4乾燥,濃縮以獲得紅色油狀物,以石油醚洗滌以得到米白色固體化合物1(250.0g,產率:75.2%)。
合成步驟2:
將化合物1及2-乙醯氨基丙二酸二乙酯(2-acetylaminomalonic acid diethyl ester)溶於甲苯,接著加入固體NaOH並加熱回流18小時。以TLC鑑定。攪拌同時冷卻至10℃,並靜置2小時。通過過濾收集沉澱物,乾燥以獲得白色固體化合物2(180.0g,產率:98%)。
合成步驟3:
化合物2於2N NaOH中加熱回流3小時,並以TLC鑑定。冷卻至室溫,酸化至pH=2,以EA萃取5次,以鹽水洗滌集合的有機相,以Na2SO4乾燥,濃縮以獲得白色固體化合物3(150.0g,產率:100%)。
合成步驟4:
化合物3於水中加熱回流3小時,並以TLC鑑定。冷卻至室溫,通過過濾收集沉澱物,乾燥以獲得白色固體化合物4(98.0g,產率:76%)。
合成步驟5(5-MTP合成):
化合物4加入一KH2PO4水溶液(50mM),加入KOH攪拌10分鐘,獲得一澄清溶液。加入CoCl2(50mM),保持pH=8,使用KOH(2N aq),加入醯
化酶並於35-40℃反應16小時,以TLC鑑定。通過過濾收集沉澱物,以水洗滌直到EE%純度超過98%,乾燥以獲得5-MTP(14.0g產物,產率:33%)。
合成步驟6(5-MTPE合成):
5-MTP及催化劑量的濃縮H2SO4溶於MeOH,接著加熱回流該溶液24小時,以TLC鑑定。濃縮MeOH並將殘餘物傾倒入水中並以NaHCO3鹼化至pH=7.5,以DCM萃取3次,以鹽水洗滌集合的有機相,以Na2SO4乾燥,濃縮以獲得一紅色油狀物,在MTBE中結晶以獲得4.8g褐色固體狀的5-MTPE(產率:77%)。
合成步驟7(NACT-5MTP合成):
1g的5-MTP溶於50mL的冰NaOH(2N),在0℃以下,將0.5mL Ac2O滴入,內部溫度低於0℃,接著在相同條件下攪拌0.5小時,酸化至pH=2,通過過濾收集沉澱物,以水洗滌並在50℃下乾燥24小時以得到1g NACT-5MTPE(cat# 22099)。
通過薄層色層分析法(TLC)、LC-MSMS及質子NMR分別鑑定所得5-MTPE及NACT-5MTP之純度及化學結構,結果如圖1B至圖1F所示。
[體外及體內試驗]
細胞培養及處理
來自美國菌種收集所(American Type Culture Collection)的小鼠巨噬細胞(Mouse RAW264.7 macrophages)培養於含有10% FBS的DMEM。除非另有指明,在LPS處理前,細胞通常與5-MTP(Sigma-Aldrich)或不與5-MTP預培養30分鐘。LPS(100ng/ml)處理的持續時間隨試驗而變化。
對於分離出腹腔巨噬細胞,C57BL/6J小鼠被以腹腔注射2ml的4%巰基乙酸。注射四天後,以5ml冰冷的RPMI1640培養基清洗腹膜腔,通過離心收集來自腹膜滲出物的細胞並懸浮於RPMI1640培養基,接著接種在15-cm的培養皿並使其附著4小時。洗去漂浮的細胞,並將貼附的細胞用以作為試驗中的腹腔巨噬細胞。於每一試驗前將該細胞與或不與LPS(100ng/ml)培養一段培養時間,如同RAW264.7細胞的流程。
細胞遷移及侵入分析
簡言之,細胞(104/孔)接種於上腔室(6.5-mm植入孔,8-μm聚碳酸酯膜,康寧公司),放置在24孔盤每一孔上。下腔室注滿700Ml添加有10% FBS的DMEM。對於體外侵入的評估,如同進行穿透式細胞遷移試驗時,在相同的條件下,將細胞接種於塗有基質凝膠(Matrigel,BD Biosciences)的上腔室植入孔。在指定時間內,以棉簽移除保留在植入孔上表面的未遷移細胞。固定遷移到下膜表面的細胞以及通過基質凝膠侵入到膜下側的細胞,以0.1%結晶紫染色20分鐘並在光學顯微鏡下計數。所有的分析皆進行三重複以具有優異的再現性。
腫瘤移植試驗
購自BioLASCO的六周大的雄性CB-17 SCID小鼠,於國家衛生研究院動物中心在26℃下以12小時日照及12小時黑暗的每日循環及無病原體條件下飼養。A549-luc-C8細胞(Caliper Life Sciences)培養於添加10% FBS的RPMI-1640培養基中,以100μM 5-MTP、100μM 5-MTPE或載劑預處理5小時並皮下接種(s.c.)至小鼠側腹(5×106細胞/鼠)。每周兩次以腹腔注射5-MTP-或5-MTPE-處理小鼠(n=10),每公斤體重(kg)施予100mg的5-MTP或5-MTPE。載劑組(n=10)每周兩次注射載劑(0.033N HCl於RPMI培養基,以NaOH中和)注射。每
周兩次以游標卡尺測量皮下腫瘤尺寸。根據長×寬×寬/2的公式計算腫瘤體積。也藉由IVIS光譜影像系統每周監控腫瘤成長。在第52天安樂死小鼠。取出皮下腫瘤及肺並以10%福馬林固定。對肺的每片肺葉上的結節計數。藉由組織切片及H&E染色在顯微鏡下測量結節的組織形態。動物照護係根據國家衛生研究院的實驗動物照護及使用委員會批准的體內試驗機構指導方針及步驟。
小鼠模式中的內毒素血症誘發
在以腹腔給藥LPS(60mg/kg)前,對C57BL/6小鼠(6-8周大)以腹腔注射生理食鹽水或不同濃度的5-MTP(23.4或100mg/kg)處理30分鐘。監測動物的存活和其他臨床體徵包括豎起毛皮、嗜睡、腹瀉和體重減輕。在LPS注射後的不同時間點犧牲動物。收集血液樣本、腹腔滲出液、肺及脾臟。所有的試驗都經由國家衛生研究院的實驗動物照護及使用委員會批准。
細胞素專一性ELISA
藉由專一性三明治法ELISA在微孔盤(96孔)中測定培養基上清液及血清中的細胞素含量,如前所述(Wu,J.Y.& Kuo,C.C. Pivotal role of ADP-ribosylation factor 6 in Toll-like receptor 9-mediated immune signaling.J Biol Chem 287,4323-4334(2012))(Lee,G.L.,et al.TLR 2 induces vascular smooth muscle cell migration through cAMP response element-binding protein-mediated interleukin-6 production.Arterioscler Thromb Vasc Biol 32,2751-2760(2012);hereinafter,Lee,G.L.,et al.)。
西方墨點分析
將細胞蛋白透過5%至20%SDS-PAGE解析並轉印到硝基纖維素膜上並以專一性抗體漬點,如前所述(Lee,G.L.,et al.)。
啟動子螢光素酶報導基因(Promoter-luciferase reporter)分析
RAW264.7巨噬細胞利用FuGENE 6(Roche)與COX-2啟動子-螢光素酶、如前述所建構的IL-6啟動子-螢光素酶(Lee,G.L.,et al.)或p5xNF-κB-螢光素酶(Stratagene)及pcDNA3.1-β-半乳糖苷酶質體進行共轉染。轉染過夜後,在存在或不存在5-MTP下,將細胞與LPS或不與LPS培養8小時。處理後,將細胞溶解,並利用分析試劑組(Promega)測量螢光素酶活性。β-半乳糖苷酶活性用以標準化數據。
MPO活性分析
通過骨髓過氧化酶螢光偵測試劑組(Enzo Life Sciences)分析肺組織的骨髓過氧化酶(Myeloperoxidase,MPO)活性。簡言之,在組織蛋白萃取緩衝液(pH 7.4 25mM Tris緩衝液、150mM NaCl、0.5%脫氧膽酸鈉(sodium deoxycholate)、2% NP-40及0.2% SDS)中,通過Tissuelyser II(Qiagen)均質化肺組織樣本,並於4℃下以12,000×g離心20分鐘。移除上清液並於含0.5%十六烷基三甲銨的分析緩衝液(1ml)中以Tissuelyser II均質化沉澱物30秒,接著冷凍、解凍樣品三次,並以8,000×g離心20分鐘。在暗室中,室溫下,,將收集的上清液和標準品與反應混合物(50μM檢測試劑及20μM過氧化氫於1X分析緩衝液中)混合。30分鐘培養後,於螢光盤讀取儀中,在激發波長530nm及發射波長600nm下,通過測量螢光強度鑑定MPO活性。
胱天蛋白酶-3活性分析
藉由螢光基質z-DEVD-AMC(Upstate Biotechnology)的裂解鑑定胱天蛋白酶-3活性,如前所述(Kuo,C.C.,Liang,C.M.,Lai,C.Y.& Liang,S.M.
Involvement of heat shock protein(Hsp)90 beta but not Hsp90 alpha in antiapoptotic effect of CpG-B oligodeoxynucleotide.J Immunol 178,6100-6108(2007))。
組織學及免疫組織化學
對於組織研究,以生理食鹽水灌流肺臟並浸泡在福馬林中24小時。組織塊放置於福馬林中,在連續梯度乙醇中脫水,包埋於石蠟中,切片成3μm厚的連續切片,並以蘇木精(haematoxylin)和伊紅(eosin)染色以檢測發炎細胞(inflammatory cells)、肺泡充血(alveolar congestion)和肺泡間壁厚度(alveolar septal wall thickness)和間質水腫(interstitial edema)。
在肺切片中的COX-2、iNOS、Ly6g或裂解的胱天蛋白酶-3的免疫組織化學檢測前,切片以二甲苯脫蠟,透過梯度醇類逐漸再水合。在電壓力鍋中,透過於pH 8 EDTA抗原修復劑(Trilogy;Cell Marque Corporation)中加熱玻片上的切片15分鐘以修復抗原位置。切片接著透過UltraVision過氧化氫阻斷劑(Thermo)阻斷10分鐘並以UltraVision蛋白阻斷劑再阻斷5分鐘。之後所述的所有抗體皆以阻斷緩衝液稀釋。切片與一級抗體在室溫下培養2小時,接著在PBST中洗滌。切片與一級抗體放大劑(primary antibody amplifier quanto,Thermo)培養10分鐘。以PBST潤濕後,切片與HRP聚合物(HRP Polymer Quanto,Thermo)培養10分鐘並以PBST清洗3次。通過添加DAB Quanto顯色劑:基質(DAB Quanto Chromogen:Substrate)作用3分鐘觀察COX-2、iNOS、Ly6g或裂解的胱天蛋白酶-3。也以蘇木精對比染色組織。
患者徵集及血清5-MTP含量測量
在2013年9月至2015年7月間徵集227位具有CAD的患者(161位男性及66位女性,平均年齡為61.2±12.13歲)及80位不具有CAD與已知全身性疾病
的控制組(43位男性及37位女性,平均年齡為40±13.34歲)。在台灣的三軍總醫院及國防醫學院的人體道德委員會批准了研究協議(TSGHIRB # 2-102-05-104 and 2-102-05-105)並從所有參與者獲得已簽署的知情同意書。透過冠狀動脈造影確認CAD的存在,且CAD被定義為在1個以上的冠狀動脈中有超過50%血管造影狹窄(angiographic diameter stenosis)。在23種血管造影之前從患者抽血並收集血清儲存在-80℃直到分析。
小鼠動脈中的脂質堆積及動脈粥狀硬化病變形成
ApoE缺乏的小鼠在六周大時被放置在含有1.25%膽固醇及21%脂肪的西方高脂肪飲食(研究飲食)中。透過腹腔注射載劑(PBS)、5-MTP或5-MTPE(23.4mg/kg體重,一周3次)同步處理小鼠。8周後,解剖主動脈樹(aortic tree)並於主動脈弓及其分支中檢查病變。在解剖顯微鏡下仔細地排除主動脈的結締組織及脂肪組織,縱向展開並以Oil red O染色。
小鼠中的動脈鈣化
ApoE缺乏的小鼠在六周大起餵食含有1.25%膽固醇及21%脂肪的西方高脂肪飲食(研究飲食)。透過腹腔注射載劑(PBS)或5-MTP(23.4mg/kg體重,一周3次)同步處理小鼠。20周後,解剖主動脈樹並於主動脈弓及其分支中檢查病變。通過馮庫薩染色(von Kossa staining)評估在主動脈根部的血管鈣化。
小鼠中的頸動脈結紮之新生內膜形成模式
約12周大的雄性C57BL/6野生型小鼠(國家實驗動物中心,台灣)透過結紮左頸動脈(left common carotid artery,LCCA)進行新生內膜形成模式。台灣的國家衛生研究院的實驗動物照護及使用委員會批准了所有的實驗程序(#NHRI-IACUC-101144-A)。以IP注射劑量為250mg/kg的三溴乙醇溶液麻醉小
鼠。透過確認足底反射(pedal reflex)評估麻醉程度後,通過在頸部中線切口露出LCCA。在靠近頸動脈分支部用縫線結紮LCCA,縫合皮膚,並使動物從麻醉中恢復且無呈現中風症狀。手術後,以IP注射載劑(PBS)或100mg/kg的5-MTP(Sigma,M4001)、1周3次的方式處理小鼠。5-MTP先溶於0.05N HCl(製於PBS中),以NaOH調整pH至7.4,接著以PBS準備6.5mg/mL的儲存溶液。使用前,藉由通過0.22μm的濾紙過濾以滅菌該儲存溶液。在培養的時間點(手術後4、7及28天),以三溴乙醇溶液(500-750mg/kg)麻醉小鼠,灌注生理實驗水,接著灌注10%中性緩衝福馬林。接著小心解剖對側對照組(右頸動脈)及結紮的LCCA,切除,並於石蠟中進行包埋前浸泡於10%福馬林中。
統計分析
所有數值均表示為平均值±標準誤差。治療組和對照組之間差異的統計顯著以t檢驗(t-test)或單因素方差分析(1-way ANOVA)計算。小於0.05的P值被認為具有統計顯著。
[結果]
5-甲氧基色胺酸(5-methoxytryptophan)衍生物控制COX-2表現
以不同濃度的5-MTP、5-MTPE及NACT-5-MTP預處理A549細胞30分鐘後,以PMA刺激細胞8小時。以COX-2或β-肌動蛋白的抗體對細胞裂解物進行免疫墨點處理。重複3次具有類似結果的試驗。
根據圖1F所示結果,如同5-MTP效果,5-MTPE及NACT-5MTP兩者阻斷A549細胞中的PMA誘導的COX-2蛋白表現呈劑量依賴性(dose dependent)。再者,兩個5-MTP衍生物的COX-2抑制活性比5-MTP更強。
當血清素(serotonin)、5-甲氧基色胺及色胺酸佔據5-MTP的吲哚骨架,我們判別該些化合物在A549細胞中對PMA誘導的COX-2表現的影響。如下表1所示,血清素或5-甲氧基色胺或色胺酸對COX-2表現含量皆無效果,這表明了對於抑制PMA誘導的COX-2表現而言,5-甲氧基-吲哚-3-丙酸基團是必需的。總言之,這些結果表明5-MTP及其衍生物在A549肺癌細胞中抑制PMA誘導的COX-2表現。
5-甲氧基色胺酸衍生物阻斷癌症遷移及腫瘤生長
以不同濃度的5-MTP、NACT-5MTP或5-MTPE預處理肺癌A549細胞及乳癌BT474及T47D細胞30分鐘,接著以PMA刺激4小時或24小時。通過穿透式細胞遷移試驗(transwell migration assay)測量細胞遷移。結果表明5-MTP、5-MTPE及NACT-5MTP終止了PMA誘導4小時或24小時的A549(圖2A)及乳癌BT474及T47D(圖2B)的細胞遷移。
此外,A549(5×106個細胞)以皮下注射至SCID-Beige小鼠的側腹。每10隻小鼠接受每周2次的腹腔注射5-MTP(100mg/kg)、5-MTPE(100mg/kg)或載劑。持續7周的利用游標卡尺測量周期性皮下腫瘤體積。圖2C所示結果表明
5-MTP及5-MTPE隨時間抑制腫瘤體積,呈時間依賴性。在5-MTP處理組中,7周時的平均腫瘤體積約為控制組的體積的50%。
圖2A-2C所示結果表明5-MTP及其衍生物抑制體外及體內的癌症遷移及腫瘤生長。
5-甲氧基色胺酸衍生物抑制巨噬細胞中LPS誘導的COX-2表現及細胞素製造
以不同濃度的5-MTP預處理小鼠巨噬細胞RAW264.7細胞30分鐘後,以LPS刺激細胞8小時。以COX-2或β-肌動蛋白的抗體對細胞裂解物進行免疫墨點處理。此外,以COX-2啟動子螢光素酶質體轉染RAW264.7細胞。24小時轉染後,細胞與LPS培養8小時。測量螢光素酶活性。重複3次具有類似結果的試驗。圖3A-3B所示結果表明5-MTP隨濃度阻斷在RAW264.7細胞中LPS誘導的COX-2蛋白表現及啟動子活性,呈濃度依賴性。
再者,以LPS與5-MTP或不與5-MTP刺激腹腔巨噬細胞。8小時後,通過西方墨點法測量COX-2蛋白表現。重複3次具有類似結果的試驗。圖3C所示結果表明5-MTP在初代小鼠腹腔巨噬細胞中抑制LPS誘導的COX-2表現。
再者,以不同濃度的5-MTP預處理RAW264.7細胞及經IL-6啟動子螢光素酶質體轉染的RAW264.7細胞30分鐘,接著以LPS刺激8小時。通過螢光素酶分析測量IL-6啟動子活性。通過ELISA測量培養上清液中的IL-6含量。根據圖3D-3E所示結果,相較於5-MTP抑制COX-2表現(圖3A-3B),5-MTP隨濃度抑制RAW264.7細胞中LPS誘導的IL-6啟動子活性及蛋白表現,呈濃度依賴性。
再者,以LPS與5-MTP或不與5-MTP刺激腹腔巨噬細胞。24小時後,通過ELISA測量促炎細胞素。圖3F所示結果表明5-MTP抑制腹腔巨噬細胞中的IL-6、IL-1β及TNF-α產生以及RAW264.7細胞中的TNF-α產生(數據未顯示)。
反之,血清素或5-甲氧基色胺或色胺酸對COX-2及IL-6表現含量皆無效果,如下表2所示。
再者,以不同濃度的5-MTP或5-MTPE處理RAW264.7細胞24小時。通過MTT分析鑑定細胞活性。於另一試驗中,以不同濃度的5-MTP或5-MTPE預處理RAW264.7細胞30分鐘後,以LPS刺激細胞24小時。通過ELISA測量在培養上清液中的IL-6含量。如圖4A-4B所示,5-MTP的衍生物(5-MTPE)顯著抑制LPS誘導的細胞素產生,但不影響細胞活性。
從圖3A-3B及表2所示結果,這些結果意指對於抑制LPS誘導的COX-2及IL-6製造而言,5-甲氧基-吲哚-3-丙酸基團是必需的。總言之,這些結果表明5-MTP及其衍生物(5-MTPE)抑制小鼠RAW264.7細胞及腹腔巨噬細胞中的LPS誘導發炎反應。
5-甲氧基色胺酸衍生物防止小鼠中的致命性內毒素
由於因內毒素對5-MTP的抑制可能導致巨噬細胞的促炎細胞素及調節子(mediator)不受控制的過度產生,我們判別是否外源性5-MTP引入能拯救小鼠免於LPS誘導全身性發炎、器官損傷及死亡(mortality)。小鼠被注射生理食鹽水、5-MTP(23.4mg/kg)、5-MTPE(25mg/kg)或載劑作用30分鐘,接著注射LPS(60mg/kg)(生理食鹽水,n=25;5-MTP,n=7;5-MTPE,n=7;LPS,n=30;LPS+5-MTP,n=25;LPS+5-MTPE,n=25)。在接下來的72小時期間監控存活率。*表示相較於LPS處理,P<0.001。
如圖5A所示,以LPS處理的小鼠在第1天就開始出現死亡,且超過65%的小鼠在72小時死亡。相反地,以5-MTP處理的小鼠沒有在第1天死亡且僅有20%內毒素症小鼠在第3天死亡,且在對照組(僅生理食鹽水或5-MTP)中沒有觀察到死亡。值得注意的是,5-MTPE在LPS誘導致命性內毒素症中顯示100%保護能力。為確認5-MTP在內毒素症中的保護效果,我們在小鼠中使用盲腸結紮及穿孔(cecal ligation and puncture,CLP)模式。在以CLP處理的小鼠中也可觀察到5-MTP提供的保護。在第2天,存活率顯著地由0%提高至44.4%。提高的存活率維持至第6天(圖5B)。
此外,從在指定時間注射60mg/kg LPS與生理食鹽水或5-MTP或不與生理食鹽水或5-MTP的小鼠肺臟製備石蠟包埋的切片。以蘇木精及伊紅染色肺組織並在光學顯微鏡下檢測。結果如圖5B所示,所示比例尺為100μm。
如圖5B所示,肺組織的檢測顯示LPS誘導隨時間進展的多形核白細胞浸潤(polymorphonuclear leukocyte infiltration)、肺泡間隔壁增厚(alveolar septal wall thickening)、間質水腫(interstitial edema)、及肺泡充血(alveolar
congestion),與膿毒症的病理變化是一致的。5-MTP顯著緩和這些因LPS所致的病理變化。
再者,從經LPS與各種濃度的5-MTP或不與各種濃度的5-MTP處理24小時的小鼠中分離支氣管肺泡灌洗液(bronchoalveolar lavage fluid,BALF)。通過台盼藍染色分析鑑定BALF中的細胞數。
如圖5C所示,在LPS給藥24小時之後,在支氣管肺泡灌洗液(BALF)中的總細胞數有顯著增加,其隨著5-MTP劑量減少而降低。
再者,從注射60mg/kg LPS與生理食鹽水或5-MTP或不與生理食鹽水或5-MTP的小鼠,在12、16及24小時的時間點製備肺臟石蠟包埋的切片。分別以抗COX-2及抗iNOS抗體染色,通過免疫組織化學鍵定肺組織中的COX-2及誘導型一氧化氮合成酶(inducible nitric oxide synthase,iNOS)蛋白含量。結果如圖6A-6B所示,所示比例尺為100μm。如圖6A-6B所示,5-MTP在LPS誘導內毒素症的肺組織中抑制COX-2(圖6A)及iNOS(圖6B)表現,與5-MTP抑制巨噬細胞COX-2表現及細胞素產生(特別是iNOS產生)的結果一致。
小鼠被腹腔內注射不同濃度的5-MTP或生理食鹽水作用30分鐘,接著於指定時間注射LPS。通過ELISA測量血清中的促炎細胞素含量(每組n=6)。圖7A-7D所示結果分別表明5-MTP隨劑量及時間緩和LPS處理的小鼠中IL-1β、TNF-α、IL-6及INF-κ的血液水平的提高,呈時間、濃度依賴性。再者,23.4mg/kg的5-MTP顯著降低所有測試的細胞素且100mg/kg的5-MTP降低細胞素至基礎水平。此外,5-MTP在LPS處理的小鼠中抑制IL-12增加(數據未顯示)。這些結果意指5-MTP藉由預防細胞素、前列腺素(prostaglandin)及NO風暴(NO storm)防止LPS誘導肺損傷及死亡。
為更進一步確認在內毒素症過程中5-MTP使腹腔巨噬細胞去活性,我們從未處理5-MTP或5-MTP處理的內毒素症小鼠中分離的腹腔巨噬細胞中,離體(ex vivo)評估5-MTP對IL-1β及IL-6產生的效果。在注射LPS與生理食鹽水或5-MTP(23.4mg/kg)8小時之後,分離腹腔巨噬細胞並單獨培養於培養液中。24小時之後,通過ELISA(n=3)測量促炎細胞素。如圖7E所示,來自未處理的小鼠的巨噬細胞自發性地產生大量的IL-1β及IL-6,兩者皆被5-MTP顯著地抑制。
為確保5-MTP處理增加血清5-MTP,我們分析5-MTP輸液後24小時及72小時的5-MTP含量。於24小時及72小時,在經生理食鹽水或LPS與5-MTP(23.4mg/kg)或不與5-MTP處理的小鼠的血清5-MTP濃度。誤差條表示平均值±標準誤差(mean±SD,n=3)。如圖7F所示,在5-MTP給藥後24小時,血清5-MTP維持高度提升,為基礎水平的數倍,並在72小時回到基礎水平。
這些結果支持:藉由5-MTP抑制LPS有助於全身性發炎症、肺損傷及死亡,以及補充5-MTP以促進5-MTP含量能夠控制全身性發炎症及防止組織損傷及死亡。
5-MTP降低中性白血球浸潤(neutrophil infiltration)及趨化素產生(chemokine production)
生理食鹽水或5-MTP處理後30分鐘,於4小時、12小時、16小時及24小時對小鼠以腹腔注射LPS。對石蠟包埋的肺組織樣本進行免疫組織化學Ly6G染色以鑑定肺組織中的中性白血球浸潤。結果如圖8A所示,所示比例尺為100μm。如圖8A所示,中性白血球浸潤在4小時輕微增加且在12小時變得顯著增加,隨後進行LPS處理。再者,隨5-MTP劑量而降低了中性白血球浸潤,在100mg/kg時,浸潤幾乎降低至基礎水平。
此外,經生理食鹽水或LPS處理的小鼠在5-MTP(23.4mg/kg)存在或不存在的情況(n=6小鼠/組)下,鑑定其肺組織經16小時後的MPO活性。如圖8B所示,肺MPO活性分析表明5-MTP降低中性白血球浸潤至基礎水平。
再者,經生理食鹽水或LPS注射的小鼠在生理食鹽水或5-MTP給藥(23.4mg/kg)或未給藥後24小時(n=10),通過ELISA檢測其血清中的趨化素水平。圖8C所示結果表明LPS誘導的趨化素升高,通過5-MTP處理24小時後,降低了血清中的CXCL1、MCP-1、RANTES及伊紅趨素(eotaxin)。
圖8A-8C所示結果表明:藉由抑制巨噬細胞活性及細胞素產生、同時降低中性白血球浸潤及多種促炎趨化素產生,5-MTP降低膿毒症介導的肺損傷。
5-MTP防止LPS誘導肺臟及脾臟細胞凋亡
由經生理食鹽水或LPS(60mg/kg)處理並施予或不施予不同濃度的5-MTP作用12小時或16小時後的小鼠,製備肺組織石蠟包埋切片。透過免疫組織化學染色裂解的胱天蛋白酶-3鑑定肺組織中活化的胱天蛋白酶-3含量。結果如圖9A所示,所示比例尺為200μm。如圖9A所示,由在12小時及16小時增加的裂解胱天蛋白酶-3表現,LPS處理導致細胞凋亡顯著增加,而其透過5-MTP處理有所降低。
此外,透過如前所述的螢光基質檢測經生理食鹽水、LPS或LPS+5-MTP(100mg/kg)處理16小時的小鼠脾細胞中的胱天蛋白酶-3活性。結果如圖9B所示,其中誤差線表示為平均值±標準誤差(mean±SD,n=6小鼠/組)。如圖9B所示,5-MTP亦防止了脾臟細胞中經LPS誘導的胱天蛋白酶-3裂解。
再者,亦評估脾臟重量/體重比(SW/BW,n=6小鼠/組)。如圖9C所示,相較於經生理食鹽水處理的小鼠的脾臟重量/體重比,經LPS處理的小鼠脾臟重量/體重比(SW/BW)顯著增加,與嚴重脾臟水腫一致。5-MTP處理隨劑量改善脾臟水腫,呈劑量依賴性。
根據圖9A-9C所示結果,其表明5-MTP防止內毒素症小鼠經LPS誘導的肺臟及脾臟細胞凋亡。
5-MTP抑制LPS介導的免疫訊號
在以不同濃度的5-MTP預處理RAW264.7細胞30分鐘後,以LPS刺激細胞4小時。以p38、磷酸化-p38(phospho-p38,p-p38)、ERK1/2、磷酸化-ERK1/2(phospho-ERK1/2,p-ERK1/2)或β-肌動蛋白(β-actin)的抗體對細胞裂解物進行免疫墨點處理。如圖10A所示,於經LPS處理的RAW264.7細胞中,5-MTP隨劑量阻斷p38 MAPK磷酸化,但未阻斷ERK1/2磷酸化。對TLR誘導NF-κB活性化而言,巨噬細胞中的p38 MAPK活性化是必需的,為影響TLR誘導細胞素產生的一個關鍵因子。因此,我們評估5-MTP在LPS誘導NF-κB活性化的效果。
在以不同濃度的5-MTP預處理RAW264.7細胞30分鐘後,以LPS刺激細胞8小時。藉由NF-κB啟動子-螢光素酶分析檢測NF-κB啟動子活性。如圖10B所示,5-MTP隨濃度抑制NF-κB轉活化,呈濃度依賴性。
再者,在以不同濃度的5-MTP預處理RAW264.7細胞30分鐘後,以LPS刺激細胞4小時。以專一性抗體進行免疫墨點處理以鑑定NF-κB p65、磷酸化NF-κB p65(phospho-NF-κB p65,p-p65)(Ser536)或β-肌動蛋白。結果如圖10C所示。腹腔巨噬細胞亦於指定時間經LPS與5-MTP(50μM)或不與5-MTP處理。通過ELISA試劑組分析裂解物中的磷酸化-p65。結果如圖10D所示,其中誤差線表
示為平均值±標準誤差(mean±SD,n=3)。根據圖10C-10D,5-MTP不僅降低RAW264.7細胞中的LPS誘導NF-κB p65磷酸化(圖10C),亦降低腹腔巨噬細胞中的LPS誘導NF-κB p65磷酸化(圖10D)。
由於NF-κB活性化在全身性發炎症及敗血症病變(septic pathology)的引發及惡化中扮演關鍵角色,因此評估5-MTP對肺組織中NF-κB活性化的影響。在LPS與5-MTP(23.4mg/kg)或不與5-MTP(n=6小鼠/組)注入後,藉由ELISA試劑組檢測4小時及8小時於肺組織中的磷酸化-p65含量。圖10E所示結果表明LPS顯著提高了肺組織中的NF-κB p65磷酸化含量,而其透過5-MTP處理有所降低。
5-MTP抑制p300組蛋白乙醯轉移酶(p300 histone acetyltransferase,HAT)活性化
p300 HAT活性化在NF-κB轉錄共活性化及發炎類基因(如COX-2及iNOS)表現中扮演重要作用。因此,我們評估5-MTP對p300 HAT活性化的抑制表現。
於指定時間,以p300 HAT活性分析試劑組檢測在經LPS處理的腹腔巨噬細胞於5-MTP(50μM)存在或不存在的情況下的p300 HAT活性。如圖10F所示,LPS於4小時活化腹腔巨噬細胞中的p300 HAT並維持至24小時。5-MTP亦顯著阻斷p300 HAT活性化直到24小時。
此外,在LPS與5-MTP(23.4mg/kg)或不與5-MTP注入後的8-24小時,藉由分析試劑組檢測肺組織中的p300 HAT活性。如圖10G所示,於體內,LPS提高了肺組織中的p300 HAT活性,但如同體外巨噬細胞結果,被5-MTP所抑制。
基於上述結果,其表明5-MTP抑制LPS誘導的p300 HAT活化及NF-κB活性,從而抑制COX-2、iNOS及促炎細胞素表現。細胞素及促炎COX-2及iNOS的共同抑制表明5-MTP在膿毒症中的保護效果,如圖10F所示。
5-MTP、5-MTPE及COX-2抑制劑及NF-κB抑制劑對LPS誘導COX-2及IL-6表現的抑制效果
因為COX-2抑制劑被認為是一種抗發炎劑,我們接下來評估5-MTP衍生物及COX-2抑制劑(NS398及SC560)對LPS誘導IL-6產生的抑制效果。
於此,以不同濃度的5-MTP、5-MTPE、COX-2抑制劑(NSC398或SC560)及NF-Kb抑制劑(JSH-23)預處理RAW264.7細胞30分鐘之後,以LPS刺激細胞。此外,亦以COX-2啟動子-螢光素酶質體轉染RAW264.7細胞。轉染24小時後,細胞與LPS培養8小時。測量螢光素酶活性。
圖11A表示在LPS處理後24小時用ELISA檢測在培養上清液中的IL-6含量。結果表明所有使用的試劑隨劑量阻斷RAW264.7細胞中由LPS誘導的IL-6製造。比較每一者,5-MTPE對IL-6製造有較佳的抑制能力。
如上所述,經由抑制NF-κB活性化,5-MTP抑制LPS誘導的全身性發炎症。再者,NF-κB已被報導作為抗發炎及抗癌試劑。我們比較5-MTP衍生物與NF-κB抑制劑(JSH-23)對LPS誘導的COX-2及IL-6表現的抑制效果。如同JSH-23效果,5-MTP及5MTPE兩者隨劑量阻斷RAW264.7細胞中LPS誘導的COX-2及IL-6產生,呈劑量依賴性。值得注意的是,5-MTPE對COX-2及IL-6抑制活性比NF-κB抑制劑(JSH-23)更有效,如圖11B-11C所示。
血清5-MTP濃度與冠狀動脈疾病呈負相關
為探討5-MTP在CAD中的臨床相關性,我們測量對照組及具有CAD患者的血清5-MTP含量。40位對照組(26位男性及14位女性,平均年齡50±11歲)及40位CAD患者(31位男性及9位女性,平均年齡62±12歲)包含於本次研究中。藉由冠狀動脈造影確認CAD存在並將CAD定義為在一個以上的冠狀動脈中超過50%的血管造影直徑狹窄。在對照組及CAD組織間的身體質量指數並無差異(25.5±3.7 vs.25.6±4.1)。對照組沒有任何冠狀動脈血管及已知全身性疾病。從對照組或血管造影前的患者抽取的血液中獲取血清。以酵素免疫分析5-MTP的檢測顯示對照組的平均血清5-MTP水平為0.85±0.03μmol/L(圖12A)。反之,CAD患者的血清5-MTP含量顯著降低至0.20±0.02μmol/L(圖12A,P<0.0001 vs.對照組)。結果表明血清5-MTP濃度與冠狀動脈疾病呈負相關。
5-MTP衍生物防止Apo-E缺陷型小鼠動脈粥樣硬化及血管鈣化
由於CAD患者的血清5-MTP降低可能與血管疾病發展相關,我們確認是否外源型5-MTP衍生物對動脈粥樣硬化發展起保護作用。餵食6周大起的ApoE缺陷型小鼠含有1.25%膽固醇及21%脂肪(研究飲食)的西方高脂肪飲食。小鼠透過腹腔注射載劑(PBS)、5-MTP或5-MTPE進行處理(23.5mg/kg體重,每周3次)。8周後,解剖主動脈樹並於主動脈弓及其分支進行病變檢查。我們的數據來自先導試驗,其指出大量的淺色脂質累積於載體處理的小鼠中(圖12B,箭頭)。相較之下,5-MTP處裡的小鼠在動脈中具有較少的脂質累積(圖12B,箭頭)。於5-MTPE處裡的小鼠中觀察到類似的結果,oil red O分析表明相較於載劑處理的小鼠,5-MTPE在高脂肪飲食治療的ApoE缺陷型小鼠的動脈粥樣硬化病變中抑制脂質的累積(圖12C)。
血管平滑肌細胞(Vascular smooth muscle cell,VSMC)鈣化為誘發心血管疾病中動脈粥樣硬化的血管鈣化的主要現象。我們接著探討5-MTP衍生物對VSMC鈣化的影響。5-MTP及5-MTPE在血管平滑肌細胞中降低鈣化培養基誘導的鈣化(圖12D)。此外,5-MTP在ApoE缺陷型小鼠中亦防止高脂肪飲食誘導的血管鈣化(圖12E)。
5-MTP在小鼠頸動脈結紮模式中降低新生內膜形成
為開始探討5-MTP在血管重塑中的潛在功能,我們對小鼠進行頸動脈節紮的新生內膜模式,並以載劑或5-MTP治療小鼠。結紮後4周,H&E及彈性蛋白染色顯示在載劑處理的結紮頸動脈中有強健的新生內膜形成(圖13A、圖13C)。反之,5-MTP處理的小鼠的結紮頸動脈的內膜增厚下降(圖13B、圖13D)。量化分析表明5-MTP顯著減少內膜/中膜比(載劑組(n=9)為0.96±0.19;5-MTP組(n=12)為0.58±0.11,P<0.05;圖13E)。
總結而言,我們証明了5-MTP及其衍生物(5-MTPE及NACT-5-MTP)在控制COX-2、細胞素及發炎類調節子過度表現、伴隨預防癌細胞生長及遷移、肺損傷及全身性發炎症所致死亡率的改善方面是有效的。5-MTP可透過作為循環激素(circulating hormone)以控制過度的COX-2表現及全身性發炎來發揮其功效。對於治療癌症及發炎類疾病(如膿毒症、系統性紅斑狼瘡(SLE)、心血管疾病、代謝綜合癥、癌症、敗血症和多樣炎性關節、胃腸道和腎疾病),5-MTP及其衍生物將是有價值的藥物和/或作為先導化合物用於新藥開發。
雖然本發明已就其較佳實施態樣進行說明,應當了解的是,在不悖離如以下請求的本發明精神及範疇,可進行許多其他可能的修飾及變化。
Claims (25)
- 一種醫藥組成物於製備治療發炎類相關疾病藥物之用途,其中該醫藥組成物包括對一有需要之患者施用有效劑量之式(I)化合物:
其中,R1為H;R2為C1-C10烷基;R3為H;R4為H、或C(O)ORa,其中,Ra為H、C1-C10烷基、C3-C20環烷基、C3-C20雜環烷基、芳基或雜芳基,其中C3-C20雜環烷基具有至少一選自由N、O或S之雜原子,而雜芳基具有至少一選自由N、O或S之雜原子;R5為H、或C1-C10烷基;以及n為0至5;其中,R1、R3、R4及R5不同時為H;其中,該發炎類相關疾病為膿毒症(sepsis)、全身性紅斑性狼瘡(Systemic Lupus Erythematosus,SLE)、心血管疾病(cardiovascular diseases)、代謝症候群(metabolic syndrome)、癌症、敗血症及多樣性發炎關節(septicemia and diverse inflammatory joint)、或胃腸道或腎臟疾病。 - 如申請專利範圍第1項所述之用途,其中,R2為C1-C3烷基。
- 如申請專利範圍第1項所述之用途,其中Ra為H或C1-C10烷基。
- 如申請專利範圍第3項所述之用途,其中Ra為C1-C3烷基。
- 如申請專利範圍第1項所述之用途,其中,R5為H或C1-C3烷基。
- 如申請專利範圍第1項所述之用途,其中,n為1或2。
- 如申請專利範圍第1項所述之用途,其中,該發炎類相關疾病為敗血症、SLE或癌症。
- 如申請專利範圍第1項所述之用途,其中,該化合物為
- 一種醫藥組成物於製備治療癌症藥物之用途,其中該醫藥組成物包括對一有需要之患者施用有效劑量之式(I)化合物:
其中,R1為H;R2為C1-C10烷基;R3為H;R4為H、或C(O)ORa,其中Ra為H、C1-C10烷基、C3-C20環烷基、C3-C20雜環烷基、芳基或雜芳基,其中C3-C20雜環烷基具有至少一選自由N、O或S之雜原子,而雜芳基具有至少一選自由N、O或S之雜原子;R5為H、或C1-C10烷基;以及 n為0至5;其中,R1、R3、R4及R5不同時為H。 - 如申請專利範圍第9項所述之用途,其中,R2為C1-C3烷基。
- 如申請專利範圍第9項所述之用途,其中Ra為H或C1-C10烷基。
- 如申請專利範圍第11項所述之用途,其中Ra為C1-C3烷基。
- 如申請專利範圍第9項所述之用途,其中,R5為H或C1-C3烷基。
- 如申請專利範圍第9項所述之用途,其中,n為1或2。
- 如申請專利範圍第9項所述之用途,其中,該癌症為肺癌或乳癌。
- 如申請專利範圍第9項所述之用途,其中,該化合物為
- 一種式(I)化合物,
其中,R1為H;R2為C1-C10烷基;R3為H; R4為H或C(O)ORa,其中Ra為H、C1-C10烷基、C3-C20環烷基、C3-C20雜環烷基、芳基或雜芳基,其中C3-C20雜環烷基具有至少一選自由N、O或S之雜原子,而雜芳基具有至少一選自由N、O或S之雜原子;R5為H、或C1-C10烷基;以及n為0至5;其中,R1、R3、R4及R5不同時為H。 - 如申請專利範圍第17項所述之化合物,其中,R2為C1-C3烷基。
- 如申請專利範圍第17項所述之化合物,其中Ra為H或C1-C10烷基。
- 如申請專利範圍第19項所述之化合物,其中Ra為C1-C3烷基。
- 如申請專利範圍第17項所述之化合物,其中,R5為H或C1-C3烷基。
- 如申請專利範圍第17項所述之化合物,其中,n為1或2。
- 如申請專利範圍第17項所述之化合物,其為 或。
- 一種醫藥組成物,包括一醫藥可接受載體及式(I)化合物:
其中,R1為H; R2為C1-C10烷基;R3為H;R4為H或C(O)ORa,其中Ra為H、C1-C10烷基、C3-C20環烷基、C3-C20雜環烷基、芳基或雜芳基,其中C3-C20雜環烷基具有至少一選自由N、O或S之雜原子,而雜芳基具有至少一選自由N、O或S之雜原子;R5為H、或C1-C10烷基;以及n為0至5;其中,R1、R3、R4及R5不同時為H。 - 一種醫藥組成物於製備治療發炎類相關疾病藥物之用途,其中該醫藥組成物包括對一有需要之患者施用有效劑量之式(II)化合物:
其中,該發炎類相關疾病為膿毒症(sepsis)、全身性紅斑性狼瘡(Systemic Lupus Erythematosus,SLE)、心血管疾病(cardiovascular diseases)、代謝症候群(metabolic syndrome)、或胃腸道或腎臟疾病。
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| US4746674A (en) * | 1985-08-27 | 1988-05-24 | Cellena (Cell Engineering) Ag | Melatonin compositions and uses thereof |
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| EP1574499A1 (en) * | 2004-03-08 | 2005-09-14 | DKFZ Deutsches Krebsforschungszentrum | Inhibitors of DNA methylation in tumor cells |
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| Huei-Hsuan Cheng et al., Control of cyclooxygenase-2 expression and tumorigenesis by endogenous 5-methoxytryptophan, PNAS 2012, 109(33), 13231-13236 * |
| Kenneth K Wu et al., 5-methoxyindole metabolites of L-tryptophan: control of COX-2 expression, inflammation and tumorigenesis, Journal of biomedical science, 2014, 21(17), 1-8 * |
| 鄭建志,探討色胺酸代謝物五甲氧基色胺酸抑制LPS/TLR4誘導發炎反應的機制,國防醫學院生物化學研究所碩士論文,上架日:2014年10月29日 * |
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| CA2973590C (en) | 2024-06-04 |
| TW201625526A (zh) | 2016-07-16 |
| US10577322B2 (en) | 2020-03-03 |
| NZ733731A (en) | 2022-09-30 |
| CA2973590A1 (en) | 2016-07-21 |
| EP3244887A1 (en) | 2017-11-22 |
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