TWI861015B - 包含抗原肽-佐劑核苷酸結合物之免疫誘導劑及包含其之醫藥組成物 - Google Patents
包含抗原肽-佐劑核苷酸結合物之免疫誘導劑及包含其之醫藥組成物 Download PDFInfo
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Abstract
本發明提供免疫誘導劑及包含其之醫藥組成物,該免疫誘導劑包含多核苷酸/肽結合物(peptide conjugate)作為有效成分,該多核苷酸/肽結合物係將包含CpG模體的單鏈多核苷酸或多核苷酸衍生物與具有抗原性的肽經由間隔子而結合,該間隔子係在一端側與多核苷酸或多核苷酸衍生物共價結合且在另一端側與具有抗原性的肽共價結合。
Description
本發明係關於用於對抗原肽誘導特異性免疫反應之包含新穎抗原肽-佐劑核苷酸結合物的免疫誘導劑及包含其之醫藥組成物。
由疫苗所致之感染預防的基本原理在於,藉由人為的擬似感染而誘導後天免疫,並誘導對於特定病原體的抗體產生或細胞性免疫。在後天免疫中,已知負責免疫的「記憶」之T細胞及B細胞發揮主要作用,且由DNA的再構成所致之抗體的可變區的多樣性能對無數的抗原進行特異性免疫反應。另一方面,白血球、巨噬細胞、樹突細胞等吞噬細胞發揮主要作用的先天免疫以往為吞噬病原體或異物的非特異性過程,被認為僅發揮作為在後天免疫建立前的「暫時應急」的作用,但藉由先天免疫的分子機制相關研究的進展,已知即使在先天免疫中亦進行自體/非自體的特異性辨識,以及先天免疫對後天免疫的建立而言為必須。更具體而言,藉由最近的研究已知,存在於樹突細胞、巨噬細胞、B細胞等抗原呈現細胞的類Toll受體(TLR)家族,其經由與各種病原體進行反應、誘導細胞激素的產生、促進初始T細胞往Th1細胞的分化、殺手T細胞的活化等,而誘導後天免疫。
由一連串TLR家族所辨識之病原體的構成成分雖為多種,但其中之一有為TLR9的配體之具有CpG模體的DNA(CpG DNA)。CpG模體係鹼基序列,其以在中心部排列胞嘧啶(C)與鳥糞嘌呤(G),在前後各排列二個嘌呤鹼基及嘧啶鹼基之6個鹼基為基礎,為由-PuPu-CG-PyPy-(Pu表示嘌呤鹼基,Py表示嘧啶鹼基)所表示的序列(在人類之情形中,已知GTCGTT亦具有對於TLR9的配體活性),且在哺乳類中少見,在微生物中多見(以藉由機率所計算的頻率)。又,在哺乳類中,少數存在的CpG模體幾乎皆被甲基化。在哺乳類中幾乎不存在的非甲基化CpG模體具有強大的免疫賦活活性(例如,參照非專利文獻1〜3)。藉由胞吞作用而被捕獲進細胞內的CpG DNA係藉由存在於類吞噬體的內質網之TLR9而被辨識,並強力誘導Th1反應。Th1反應抑制Th2反應優先的過敏反應,且同時具有強的抗腫瘤活性。因此,CpG DNA除了被期待作為感染預防,亦被期待作為過敏疾病、腫瘤性疾病的佐劑(例如參照非專利文獻4)。
但是,在將CpG DNA使用作為免疫療法的佐劑之情形,雖避免由細胞質及血漿中的核酸酶所致之分解、與蛋白質的非特異性結合,但如何使CpG DNA到達目標細胞的內部則成為問題。
本發明人等關注作為新穎基因載體之具有β-1,3-葡聚糖骨架的多糖(以下有時簡稱為「β-1,3-葡聚糖」),至今已發現β-1,3-葡聚糖形成以核酸醫藥(反義DNA、CpG DNA)為首之各種核酸與新型複合體 (例如,參照專利文獻1、2、非專利文獻5〜7)。
已發現將在自然中以三層重疊的形式存在之β-1,3-葡聚糖溶解於二甲亞碸(DMSO)等非質子性極性有機溶劑、或0.1N以上的鹼性溶液並使其分離成單鏈後,添加單鏈的核酸,使溶劑回到水或中性,藉此會形成包含一分子核酸與二分子β-1,3-葡聚糖的三層重疊複合體。此情形,三層重疊複合體中的β-1,3-葡聚糖分子與核酸分子被認為係主要藉由氫鍵與疏水性相互作用而形成分子間鍵結者(參照非專利文獻8)。
如上述,藉由將核酸與β-1,3-葡聚糖進行複合化,而抑制由核酸酶所致之核酸分子的水解、血漿蛋白質與核酸的非特異性結合等不被期望的核酸分子與活體內蛋白質的相互作用,且使核酸能到達細胞的內部。利用包含β-1,3-葡聚糖與核酸的複合體、以及具有抗原性的蛋白質之三元複合體,CpG DNA成功往細胞內傳遞(例如,參照專利文獻3、4、非專利文獻9〜11)。
然而,上述以往的技術具有如以下般的課題。例如,在非專利文獻11記載之β-1,3-葡聚糖/具有抗原性的蛋白質/CpG DNA之三元複合體的製造方法中,藉由過碘酸氧化,使β-1,3-葡聚糖的側鏈的葡萄糖殘基上生成甲醯基,藉由還原性胺基化反應,使甲醯基與具有抗原性的肽(以下有時簡稱為「抗原性肽」)的胺基進行反應,形成β-1,3-葡聚糖與具有抗原性的肽經共價結合的複合體,但有所謂產率極低的課題。有鑑於此狀況,例如,在專利文獻4記載之β-1,3-葡聚糖/抗原性蛋白質(具有抗原性的肽)/CpG DNA之三元複合體的製造方法中,使側鏈具有甲醯基的β-1,3-葡聚糖與具有抗原性的肽在鹼水溶液中進行反應且同時進行中和,或在鹼水溶液中進行反應並逐漸進行中和,藉此使β-1,3-葡聚糖的側鏈上的甲醯基與具有抗原性的肽的胺基之反應性及產率提升。然而,肽中因存在複數的胺基,故難以控制反應點。因此,有發生由具有抗原性的肽的反應位置所致之免疫原性錯誤、起因於與β-1,3-葡聚糖的反應生成物成為複雜混合物之分離精製的困難性等問題之虞。又,相較於利用由氫鍵所致之複合體形成而成之β-1,3-葡聚糖與DNA的複合體的形成,基於β-1,3-葡聚糖與具有抗原性的肽之共價結合的形成而成之複合體的形成較繁雜。在此等點中,專利文獻4記載之β-1,3-葡聚糖/具有抗原性的肽/CpG DNA之三元複合體的製造方法,在生產性等點上仍存有課題。
有鑑於此課題,本發明人等提案一種肽/β-1,3-葡聚糖複合體作為生產性優異、具有高免疫賦活活性的肽/β-1,3-葡聚糖複合體,其特徵在於,包含具有β-1,3-葡聚糖骨架的多糖、與具有抗原性的肽經由共價結合而與多核苷酸或多核苷酸衍生物結合之肽/多核苷酸結合物,且前述肽/多核苷酸結合物的多核苷酸或多核苷酸衍生物經由氫鍵而與前述具有β-1,3-葡聚糖骨架的多糖結合,形成具有包含一條前述多核苷酸或多核苷酸衍生物的分子鏈與二條前述具有β-1,3-葡聚糖骨架的多糖的分子鏈之三重螺旋結構的複合體 (參照專利文獻5)。然而,專利文獻5中並未記載關於構成肽/β-1,3-葡聚糖複合體之肽/多核苷酸結合物本身的免疫誘導活性。
存在一些報告暗示CpG DNA與具有抗原性的肽或蛋白質之結合物的免疫誘導活性 (參照非專利文獻12、13)。然而,在非專利文獻12中,藉由投予CpG DNA與源自卵白蛋白(OVA)抗原之18〜24mer的肽之結合物,而顯示在CD8陽性T細胞(CTL)的OVA抗原呈現活性,但並未顯示明確的CTL細胞毒性活性的誘導。又,在非專利文獻13中,藉由投予CpG DNA與OVA抗原蛋白質的結合物,而顯示CTL細胞毒性活性的誘導,但投予量高達10μg/小鼠,且在該製造時需要所謂由DNA的化學合成與抗原蛋白質的培養/精製所致之生產及此等結合物之複雜製造步驟,因此在低用量的活性及生產性仍存有課題。
[先前技術文獻]
[專利文獻]
[專利文獻1]國際公開第01/34207號
[專利文獻2]國際公開第02/072152號
[專利文獻3]日本特開2010-174107號公報
[專利文獻4]日本特開2007-70307號公報
[專利文獻5]國際公開第2015/118789號
[非專利文獻]
[非專利文獻1]Bacterial CpG DNA Activates Immune Cells to Signal Infectious Danger, H. Wagner, Adv. Immunol., 73, 329-368 (1999).
[非專利文獻2]CpG Motifs in Bacterial DNA and Their Immune Effects, M. Krieg, Annu. Rev. Immunol., 20, 709-760 (2002).
[非專利文獻3]The discovery of immunostimulatory DNA sequence, S. Yamamoto, T. Yamamoto, and T. Tokunaga, Springer Seminars in Immunopathology, 22, 11-19 (2000).
[非專利文獻4]「標準免疫學」第2版,醫學書院,2002年,333頁
[非專利文獻5]Molecular Recognition of Adenine, Cytosine, and Uracil in a Single-Stranded RNA by a Natural Polysaccharide: Schizophyllan. K. Sakurai and S. Shinkai, J. Am. Chem. Soc., 122, 4520-4521 (2000).
[非專利文獻6]Polysaccharide-Polynucleotide Complexes. 2. Complementary Polynucleotide Mimic Behavior of the Natural Polysaccharide Schizophyllan in the Macromolecular Complex with Single-Stranded RNA and DNA. K. Sakurai, M. Mizu and S. Shinkai, Biomacromolecules, 2, 641-650 (2001).
[非專利文獻7]Dectin-1 targeting delivery of TNF-α antisense ODNs complexed with β-1,3-glucan protects mice from LPS-induced hepatitis. S. Mochizuki and K. Sakurai, J. Control. Release, 151 (2011) 155-161.
[非專利文獻8]Structural Analysis of the Curdlan/Poly (cytidylic acid) Complex with Semiempirical Molecular Orbital Calculations. K. Miyoshi, K. Uezu, K. Sakurai and S. Shinkai, Biomacromolecules, 6, 1540-1546 (2005).
[非專利文獻9]A Polysaccharide Carrier for Immunostimulatory CpG DNAs to Enhance Cytokine Secretion, M. Mizu, K. Koumoto, T. Anada, T. Matsumoto, M. Numata, S. Shinkai, T. Nagasaki and K. Sakurai, J. Am. Chem. Soc., 126, 8372-8373 (2004).
[非專利文獻10]Protection of Polynucleotides against Nuclease-mediated Hydrolysis by Complexation with Schizophyllan, M. Mizu, K. Koumoto, T. Kimura, K. Sakurai and S. Shinkai, Biomaterials, 25, 15, 3109-3116 (2004).
[非專利文獻11]Synthesis and in Vitro Characterization of Antigen-Conjugated Polysaccharide as a CpG DNA Carrier, N. Shimada, K. J. Ishii, Y. Takeda, C. Coban, Y. Torii, S. Shinkai, S. Akira and K. Sakurai, Bioconjugate Chem., 17 1136-1140 (2006).
[非專利文獻12]Distinct Uptake Mechanisms but Similar Intracellular Processing of Two Different Toll-like Receptor Ligand-Peptide Conjugates in Dendritic Cells, Khan S. et al., J. Biol. Chem. 282, 21145-21159 (2007).
[非專利文獻13]Intracellular Cleavable CpG Oligodeoxynucleotide-Antigen Conjugate Enhances Anti-tumor Immunity, Kramer K. et al., Mol. Ther. 25, 62-70 (2017).
[發明欲解決之課題]
目前仍未知肽/多核苷酸結合物單獨的明確免疫誘導活性。
本發明人等發現未與β-1,3-葡聚糖形成複合體之肽/多核苷酸結合物本身、尤其是包含CpG模體之肽/多核苷酸結合物,單獨便具有高免疫誘導活性,進而完成本發明。如此,本發明之目的在於提供:生產性優異且具有高免疫賦活活性的免疫衍生物及包含其之醫藥組成物。
[用以解決課題之手段]
依據前述目的之本發明的第一態樣,係藉由提供免疫誘導劑而解決上述課題者,該免疫誘導劑包含多核苷酸/肽結合物作為有效成分,該多核苷酸/肽結合物係將包含CpG模體的單鏈多核苷酸或多核苷酸衍生物與具有抗原性的肽經由間隔子(spacer)而結合,該間隔子係在一端側與前述多核苷酸或多核苷酸衍生物共價結合,且在另一端側與前述具有抗原性的肽共價結合。
本發明的第一態樣之免疫誘導劑中,前述具有抗原性的肽的胺基酸長可為5以上且30以下。
本發明的第一態樣之免疫誘導劑中,前述具有抗原性的肽的胺基酸長可為8以上且11以下。
本發明的第一態樣之免疫誘導劑中,前述多核苷酸或多核苷酸衍生物可為包含2個以上的聚去氧核糖核苷酸(DNA)或DNA衍生物。
本發明的第一態樣之免疫誘導劑中,前述多核苷酸或多核苷酸衍生物的鹼基長可為15以上且40以下。
本發明的第一態樣之免疫誘導劑中,前述多核苷酸或多核苷酸衍生物的鹼基長可為20以上且30以下。
本發明的第一態樣之免疫誘導劑中,前述多核苷酸或多核苷酸衍生物可為磷酸二酯鍵的至少一部分被硫代磷酸酯鍵(phosphorothioate bond)取代之多核苷酸衍生物。
本發明的第一態樣之免疫誘導劑中,在磷酸二酯鍵的至少一部分被硫代磷酸酯鍵取代之多核苷酸衍生物中,磷酸二酯鍵的50%以上可被硫代磷酸酯鍵取代。
在前述磷酸二酯鍵的至少一部分被硫代磷酸酯鍵取代之多核苷酸衍生物中,磷酸二酯鍵的90%以上可被硫代磷酸酯鍵取代。
本發明的第一態樣之免疫誘導劑中,較佳為前述間隔子與前述多核苷酸或多核苷酸衍生物之間的共價結合及前述間隔子與前述具有抗原性的肽之間的共價結合之一者或兩者為在活體環境中能剪切的共價結合。
本發明的第一態樣之免疫誘導劑中,構成前述多核苷酸/肽結合物之前述具有抗原性的肽、及與前述多核苷酸或多核苷酸衍生物結合的前述間隔子,可經由共價結合(雙硫鍵)而結合,該共價結合(雙硫鍵)係藉由前述具有抗原性的肽的N端的半胱胺酸殘基的硫醇基與前述間隔子所具有的硫醇基之反應而生成。
本發明的第一態樣之免疫誘導劑中,前述間隔子可包含由下述式所表示之重複單元。
在上述式中,
X表示氧原子或硫原子(於此各X可相同亦可相異),
R表示(CH2
)p
O、(CH2
)q
NH、(CH2
CH2
O)m
之任一者(m、p及q分別獨立表示10以下的自然數),
n表示10以下的自然數。
本發明的第一態樣之免疫誘導劑中,前述間隔子可具有由下述任一式所表示之結構。
本發明的第一態樣之免疫誘導劑中,較佳為具有以下結構:
前述具有抗原性的肽的胺基酸長為5以上且30以下,
前述多核苷酸或多核苷酸衍生物為包含2個以上的CpG模體之聚去氧核糖核苷酸(DNA)或DNA衍生物,
前述多核苷酸衍生物為磷酸二酯鍵的至少一部分被硫代磷酸酯鍵取代之多核苷酸衍生物,以及
前述間隔子與前述多核苷酸或多核苷酸衍生物之間的共價結合及前述間隔子與前述具有抗原性的肽之間的共價結合之一者或兩者為在活體環境中能剪切的共價結合。
本發明的第一態樣之免疫誘導劑中,更佳為:
前述具有抗原性的肽的胺基酸長為8以上且11以下,
前述多核苷酸或多核苷酸衍生物包含2個以上的CpG模體,且為鹼基長為20以上且30以下之聚去氧核糖核苷酸(DNA)或DNA衍生物,
前述多核苷酸衍生物為磷酸二酯鍵的90%以上被硫代磷酸酯鍵取代之多核苷酸衍生物,
構成前述多核苷酸/肽結合物之前述具有抗原性的肽、及與前述多核苷酸或多核苷酸衍生物結合的前述間隔子,係經由共價結合(雙硫鍵)而結合,該共價結合(雙硫鍵)係藉由前述具有抗原性的肽的N端的半胱胺酸殘基的硫醇基與前述間隔子所具有的硫醇基之反應而生成,以及
前述間隔子具有由下述任一式
所表示之結構。
本發明的第一態樣之免疫誘導劑中,可進一步包含具有免疫賦活活性的物質作為佐劑。
本發明的第二態樣係藉由提供包含本發明的第一態樣之免疫誘導劑的醫藥組成物而解決上述課題者。
本發明的第二態樣亦可為用於腫瘤治療的醫藥組成物。
根據本發明的其他態樣,提供用於治療或預防疾病的方法,其包含將本發明的第一態樣之免疫誘導劑的有效量投予至需要其的對象。在此態樣中,疾病可為腫瘤。
根據本發明的另外態樣,提供本發明的第一態樣之免疫誘導劑的使用,其用於製造疾病的治療或預防用的醫藥。在此態樣中,疾病可為腫瘤。
[發明之效果]
本發明的肽/多核苷酸結合物可使用作為生產性優異且高活性的免疫誘導劑。又,藉由將具有抗原性的肽及多核苷酸或多核苷酸衍生物進行適當組合,可輕易地設計對多種抗原具有免疫誘導活性的免疫誘導劑。
[用以實施發明的形態]
本發明的第一實施形態之免疫誘導劑(以下有時簡稱為「免疫誘導劑」) 包含多核苷酸/肽結合物作為有效成分,該多核苷酸/肽結合物係將包含CpG模體的單鏈多核苷酸或多核苷酸衍生物與具有抗原性的肽經由間隔子而結合,該間隔子係在一端側與多核苷酸或多核苷酸衍生物共價結合,且在另一端側與具有抗原性的肽共價結合。
肽/多核苷酸結合物係具有抗原性的肽與多核苷酸或多核苷酸衍生物經由共價結合而結合之複合體。作為「具有抗原性的肽」,只要為具有抗原性者,亦即在活體的免疫系統中被辨識為異物而引起特異性抗體產生(誘導免疫反應)者,則可無特別限制地使用具有任意胺基酸序列及胺基酸殘基數者。具有抗原性的肽的序列中無半胱胺酸(Cys)之情形,在本實施形態中,可將在源自抗原蛋白質的抗原表位(antigen epitope)肽的N端進一步人為賦予一個半胱胺酸的肽使用作為具有抗原性的肽。作為製造為本實施形態之免疫誘導劑的有效成分之肽/多核苷酸結合物所能使用之具有抗原性的肽,可列舉成為食物過敏等過敏的原因之蛋白質、細菌、病毒等病原體、以腫瘤細胞等作為起源之蛋白質中具有能發揮作為表位作用的部分胺基酸序列者。構成具有抗原性的肽之胺基酸殘基數,只要能發揮作為表位的作用則未被特別限制,但多數的情形為5〜30的範圍內,大部分在8〜17左右的範圍內。
具有抗原性的肽可使用成為起源之蛋白質的酵素分解、肽合成等任意公知的方法而得。又,具有抗原性的肽之胺基酸序列可使用利用肽陣列的表位分析等任意公知的方法而決定。
作為可使用作為具有抗原性的肽之肽的例示,可列舉表位肽資料庫IEDB (www.iedb.org, last accessed: 08/11/2014)所登錄的MHC-1 T細胞表位、Chowell等人的論文(TCR contact residue hydrophobicity is a hallmark of immunogenic CD8+ T cell epitopes PNAS April 7, 2015 112 (14) E1754-E1762), Table.S1)所記載之肽、下述表1〜7所示者。在此等抗原性肽的N端進一步賦予一個半胱胺酸殘基的肽,在本實施形態中可使用作為具有抗原性的肽(但是,排除在抗原性肽的序列中既有半胱胺酸殘基之情形)。
[表1]
[表2]
[表3]
[表4]
[表5]
[表6]
[表7]
構成多核苷酸/肽結合物的單鏈多核苷酸或多核苷酸衍生物,只要包含1或複數(較佳為複數)的CpG模體,則可無特別限制地使用具有任意的鹼基序列及鹼基數的多核苷酸或其衍生物。作為CpG模體的具體例,可列舉AGCGTT、GACGTT、GACGTC、GTCGTT等。多核苷酸所含之CpG模體的數量並未被特別限制,但較佳為包含1至6個CpG模體,進一步較佳為包含2至4個CpG模體。前述多核苷酸或多核苷酸衍生物較佳為包含2個以上的CpG模體之聚去氧核糖核苷酸(DNA)或經硫代磷酸酯修飾之DNA衍生物,但亦可部分包含RNA或RNA衍生物。包含RNA或RNA衍生物之情形,較佳為其等任一或複數的含量為20%以下(具體而言,20、19、18、17、16、15、14、13、12、11、10、9、8、7、6、5、4、3、2或1%以下)。
多核苷酸或多核苷酸衍生物所含之鹼基數較佳為15〜40(具體而言,15、16、17、18、19、20、21、22、23、24、25、26、27、28、29、30、31、32、33、34、35、36、37、38、39或40),更佳為20〜30(具體而言,20、21、22、23、24、25、26、27、28、29或30)。作為較佳的多核苷酸或多核苷酸衍生物的具體例,可列舉由下述表8所示者。
[表8]
多核苷酸在活體內容易受到由核酸酶所致之分解,因此為了使在活體內的穩定性提升,亦可使用多核苷酸衍生物取代多核苷酸。作為多核苷酸衍生物的例子,可列舉核糖核苷酸的2’位的羥基的全部或一部分被氟或甲氧基取代者、聚核糖核苷酸(RNA)或聚去氧核糖核苷酸(DNA)的磷酸二酯鍵的全部或一部分被硫代磷酸酯鍵取代者等。聚核糖核苷酸或聚去氧核糖核苷酸的磷酸二酯鍵的一部分被硫代磷酸酯鍵取代之情形,較佳為磷酸二酯鍵的50%以上(具體而言,50、60、70、80或90%以上)被硫代磷酸酯鍵取代,更佳為90%以上(具體而言,90、91、92、93、94、95、96、97、98或99%以上)被硫代磷酸酯鍵取代,亦可實質上全部被硫代磷酸酯鍵取代。硫代磷酸酯鍵所取代之磷酸二酯鍵的位置並未被特別限制,可連續的複數的磷酸二酯鍵被取代,或亦可硫代磷酸酯鍵以互相不鄰接之方式被取代。
經由間隔子而與具有抗原性的肽進行共價結合的多核苷酸或多核苷酸衍生物,可與具有抗原性的肽的N端、C端、或側鏈中的任一者結合,但較佳為與具有抗原性的肽的N端側結合。具有抗原性的肽中不包含Cys殘基之情形,可使用在N側進一步賦予半胱胺酸殘基的肽。多核苷酸或多核苷酸衍生物與具有抗原性的肽係經由間隔子而結合,該間隔子係在一端側與多核苷酸或多核苷酸衍生物進行共價結合,且在另一端側與具有抗原性的肽進行共價結合而成。作為間隔子與多核苷酸或多核苷酸衍生物及具有抗原性的肽之結合形成所使用的反應性官能基,能直接使用存在於具有抗原性的肽及多核苷酸或多核苷酸衍生物的官能基,或使用可與已藉由化學修飾而活化者進行反應並形成共價結合的任意者。多核苷酸或多核苷酸衍生物,較佳為在其5’末端側或3’末端的羥基的氧原子上與間隔子結合。具有抗原性的肽,較佳為在Cys殘基側鏈的巰基(sulfhydryl group)的硫原子上與間隔子結合。
較佳的肽/多核苷酸結合物的一例,如下述式(A)所示,在具有抗原性的肽的N端側,具有多核苷酸或多核苷酸衍生物的3’或5’末端側經由間隔子Sp而結合的結構。
式(A):[多核苷酸或多核苷酸衍生物]-Sp-[具有抗原性的肽]
作為間隔子Sp的一例,可列舉伸烷基、聚乙二醇(PEG)等,但亦可包含由下述式所表示之包含磷酸二酯結構的重複單元。
在上述式中,X表示氧原子或硫原子(於此各X可相同亦可相異),R表示(CH2
)p
O、(CH2
)q
NH、(CH2
CH2
O)m
之任一者(m、p及q分別獨立表示10以下的自然數。), n表示10以下的自然數。
此等重複單元因不受到由核酸酶所致之水解,故即使X為氧原子,在活體內的穩定性亦不會大幅降低。例如,R為(CH2
)3
之情形,重複單元的尺寸變得幾乎與核糖核苷酸或去核糖核酸的尺寸相等,因此可期待因利用此間隔子取代多核苷酸或多核苷酸衍生物的一部分而導致的生產成本降低。作為間隔子Sp的具體例,可列舉下述者。
作為間隔子Sp的更佳例,可列舉具有下述任一結構者。
作為間隔子與多核苷酸或多核苷酸衍生物及具有抗原性的肽之結合形成所使用的反應性官能基的組合例,除了酯鍵、醯胺鍵、磷酸酯鍵等,還可列舉例如,往生物晶片表面固定活體分子所使用的反應性官能基彼此的組合,更具體而言,可列舉下述所示者。
(a)炔與疊氮化合物
炔與疊氮化合物(疊氮化物)係藉由如下述所示的加成環化反應(Huisgen反應)而形成1,2,3-三唑環。兩者為能導入包含活體分子的多數有機化合物之穩定官能基,即使在包含水的溶劑中亦迅速且幾乎定量地進行反應,幾乎不伴隨副反應,不生成多餘的廢棄物,因此作為所謂「點擊化學 (click chemistry)」的核心反應而被廣泛地使用在生化學領域。炔衍生物及疊氮基可使用任意公知的方法導入具有抗原性的肽或多核苷酸或者多核苷酸衍生物。作為炔衍生物,可輕易地取得炔丙醇、丙炔胺(propargylamine)等具有反應性官能基者,使此等與羧基或羥基等反應性官能基進行直接反應,或與羰基二咪唑(carbonyldiimidazole)等一起進行反應,可經由生成的醯胺鍵、酯鍵、胺基甲酸酯鍵等而導入炔衍生物。關於疊氮基,亦可使用任意公知的方法導入具有抗原性的肽或多核苷酸或多核苷酸衍生物。此外,Huisgen反應係在銅觸媒的存在下進行,但在具有抗原性的肽及磷酸二酯鍵被硫代磷酸酯鍵等含硫官能基取代的多核苷酸衍生物中,因存在與銅離子配位的硫原子,故有銅的觸媒活性降低之虞。為了使反應率提升,較佳為添加過多量的銅。
(b)順丁烯二醯亞胺或乙烯碸與硫醇基
與拉電子性的羰基或碸基鄰接之具有雙鍵的順丁烯二醯亞胺或乙烯碸,在中性附近的pH下,如下述所示,藉由與硫醇基的加成反應(麥可(Michael)加成反應),生成穩定的硫醚衍生物。具有適當間隔子的順丁烯二醯亞胺及乙烯碸衍生物已被市售,因此容易在具有抗原性的肽或多核苷酸或者多核苷酸衍生物中導入此等官能基。在具有抗原性的肽中導入硫醇基之情形,在包含半胱胺酸之具有抗原性的肽之情形中,可利用半胱胺酸殘基側鏈的硫醇基。但是,半胱胺酸係存在比例低的胺基酸,因此使用已在具有抗原性的肽的N端側導入半胱胺酸者。作為包含硫醇基的多核苷酸或多核苷酸衍生物,能使用已將此等5’末端的羥基轉換成硫醇基的硫醇化多核苷酸。
(c)半胱胺酸側鏈的硫醇基與硫醇化多核苷酸的硫醇基
如上所述,使已在N端側導入半胱胺酸之具有抗原性的肽的半胱胺酸殘基側鏈的硫醇基、與硫醇化多核苷酸的硫醇基進行反應,使雙硫基(disulfide group)形成。雙硫鍵在還原劑的存在下會被剪切,因此與上述二者相比,就穩定性的點而言為不佳。硫醇基往多核苷酸或多核苷酸衍生物的導入,可使用任意公知的方法進行,但作為具體例,可列舉如下式所示之胺基化多核苷酸或多核苷酸衍生物、與ω-(2-吡啶基二硫代)脂肪酸的N-琥珀醯亞胺酯(N-succinimidyl ester)之反應。
此等之中,較佳為由在活體內能輕易剪切的半胱胺酸側鏈的硫醇基與硫醇化多核苷酸的硫醇基之組合所致之雙硫鍵。
能使用作為本實施形態之免疫誘導劑的有效成分之多核苷酸/肽結合物,能為游離體及醫藥上可容許的鹽的形態。作為醫藥上可容許的鹽,可列舉例如,鹼金屬(鉀、鈉、鋰等)的鹽、鹼土金屬(鈣、鎂等)的鹽、銨鹽(包含四甲銨鹽、四丁銨鹽等)、有機胺(三乙胺、甲胺、二甲胺、環戊胺、苄胺、苯乙胺、哌啶、單乙醇胺、二乙醇胺、參(羥甲基)甲胺、離胺酸、精胺酸、N-甲基-D-還原葡糖胺等)的鹽、酸加成物鹽(包含鹽酸鹽、氫溴酸鹽、氫碘酸鹽、硫酸鹽、磷酸鹽、硝酸鹽等無機酸鹽;及乙酸鹽、三氟乙酸鹽、乳酸鹽、酒石酸鹽、草酸鹽、反丁烯二酸鹽、順丁烯二酸鹽、苯甲酸鹽、檸檬酸鹽、甲烷磺酸(甲磺酸)[methanesulfonic acid(mesylic acid)]鹽、乙磺酸鹽、苯磺酸鹽、甲苯磺酸鹽、羥乙磺酸鹽、葡萄糖醛酸鹽、葡萄糖酸鹽等有機酸鹽)。又,醫藥上可容許的鹽中,亦包含水合物。
本發明的第二實施形態之醫藥組成物(以下,有時僅簡稱「醫藥組成物」),包含有本發明的第一實施形態之免疫誘導劑。在醫藥組成物的製造中,除了作為有效成分的肽/多核苷酸結合物,還可使用任意公知的成分(醫藥用途所容許之任意載體、賦形劑及添加物)及製劑方法。在包含免疫誘導劑之醫藥組成物的製造中,除了作為有效成分的肽/多核苷酸結合物以外,還可使用任意公知的成分(醫藥用途所容許之任意載體、賦形劑及添加物)及製劑方法。作為製劑用的物質,可列舉以下者,但不限於此等:甘胺酸、丙胺酸、麩醯胺酸、天冬醯胺酸、精胺酸或離胺酸等胺基酸類、抗壞血酸、硫酸鈉或亞硫酸氫鈉等抗氧化劑、磷酸、檸檬酸、硼酸緩衝液、碳酸氫鈉、參-鹽酸(Tris-HCl)溶液等緩衝劑、甘露醇或甘胺酸等填充劑、乙烯二胺四乙酸(EDTA)等螯合劑、咖啡因、聚乙烯吡咯啶(polyvinylpyrrolidine)、β-環糊精或羥丙基-β-環糊精等錯合劑、葡萄糖、甘露糖或糊精等增量劑、單醣類、雙醣類等其他碳水化合物、著色劑、香味劑、稀釋劑、乳化劑或聚乙烯吡咯啶等親水聚合物、低分子量多肽、鹽形成對離子、氯化苄烷銨(benzalkonium chloride)、苯甲酸、柳酸、乙汞硫柳酸鈉、苯乙醇、對羥苯甲酸甲酯、對羥苯甲酸丙酯、洛赫西定(chlorhexidine)、山梨酸或過氧化氫等防腐劑、甘油、丙烯/二醇或聚乙二醇等溶劑、甘露醇或山梨醇等糖醇、懸浮液、山梨醇酯、聚山梨醇酯20或聚山梨醇酯80等聚山梨醇酯、曲拉通(triton)、三木甲胺(tromethamine)、卵磷脂或膽固醇等界面活性劑、蔗糖或山梨醇等穩定化增強劑、氯化鈉、氯化鉀或甘露醇、山梨醇等彈性增強劑、輸送劑、賦形劑、及/或藥學上的佐劑。相對於藥劑的重量,此等製劑用物質的添加量較佳為添加0.01〜100倍,特佳為添加0.1〜10倍。製劑中的較佳醫藥組成物的組成,依據本發明所屬技術領域中具有通常知識者,可因應適用疾病、適用投予路徑等而適當決定。
醫藥組成物係以適於經口或非經口投予的劑型而提供。例如,能使用注射劑、栓劑等,注射劑可包含靜脈注射劑、皮下注射劑、皮內注射劑、肌肉注射劑、點滴注射劑等劑型。此種注射劑可遵照公知的方法而製備。作為注射劑的製備方法,例如,可藉由將上述本發明的多核苷酸/肽結合物溶解或懸浮於通常注射劑所使用之無菌的水性溶劑而製備。作為注射用的水性溶劑,可使用例如,蒸餾水、生理食鹽水、磷酸緩衝液、碳酸緩衝液、托立斯緩衝液(Tris buffer)、乙酸緩衝液等緩衝液等。此種水性溶劑的pH可列舉5〜10,較佳為6〜8。所製備的注射液,較佳為被填充至適當的安瓿。亦可作為冷凍乾燥製劑。注射製劑另外還可做成以下形態:經皮或黏膜吸收用的劑型(液劑噴霧、軟膏、凝膠、乳液、貼片)、皮下局部緩釋用的劑型(包含奈米凝膠或生物分解性微米/奈米膠囊等的懸浮液、溫度反應性凝膠)、裝入皮膚滲透用經皮裝置的製劑(離子電滲法、微針)、粉末劑、錠劑、膠囊劑、糖漿劑、噴霧劑或乾粉等吸入劑等。
醫藥組成物亦可進一步包含具有免疫賦活活性的物質作為佐劑。佐劑雖未被限定,但為活化先天免疫的物質。佐劑較佳為先天免疫受體的促效劑。作為先天免疫受體促效劑,例示TLR促效劑(例如,TLR2促效劑、TLR3促效劑、TLR4促效劑、TLR7促效劑、TLR8促效劑、TLR9促效劑)、RLR(retinoic acid-inducible gene I (RIG-1)-like receptors,類視網酸誘導基因I受體)促效劑、STING(stimulator of Interferon genes,干擾素基因刺激物)促效劑、NLR(nucleotide-binding oligomerization domain (NOD)-like receptors,類核苷酸結合寡聚化區域受體)促效劑、CLR(C-type lectin receptors,C-型凝集素受體)促效劑等。作為TLR促效劑,可列舉例如,脂肽、Poly IC RNA、咪喹莫特(imiquimod)、瑞喹莫德(resiquimod)、單磷醯脂質A(MPL,monophosphoryl lipid)、CpG-ODN等。作為RLR促效劑,可列舉pppRNA、Poly IC RNA等,作為STING促效劑,可列舉cGAMP、c-di-AMP、c-di-GMP等,作為NLR促效劑,可列舉iE-DAP、FK565、MDP、莫拉丁酯(murabutide)等,作為CLR促效劑,可列舉β‐葡聚醣、繭蜜糖6,6’-二黴菌酸酯(trehalose 6,6’-dimycolate)等。佐劑較佳為TLR促效劑,更佳為TLR4促效劑、TLR7促效劑或TLR9促效劑,進一步更佳為咪喹莫特、瑞喹莫德、MPL或CpG-ODN。在一態樣中,佐劑為咪喹莫特、MPL或CpG-ODN。作為佐劑,係因應導入至肽/多核苷酸結合物之具有抗原性的肽等而適當選擇,但例如可為CpG DNA等,亦可為國際公開第2015/118789號所記載之多核苷酸/β-1,3-葡聚糖複合體,其係具有免疫賦活活性之具有部分鹼基序列的多核苷酸或多核苷酸衍生物、與具有β-1,3-葡聚糖骨架的多糖經由氫鍵而結合,且具有包含一條前述多核苷酸或多核苷酸衍生物的分子鏈與二條前述具有β-1,3-葡聚糖骨架的多糖的分子鏈之三重螺旋結構。
醫藥組成物能藉由經口及非經口路徑之任一者而對人類或溫血動物(小鼠、大鼠、兔、羊、豬、牛、馬、雞、貓、狗、猴等)投予。作為非經口投予路徑,可列舉皮下、皮內及肌肉內注射、腹腔內投予、點滴、往鼻黏膜或咽頭部的噴霧等。
為醫藥組成物的有效成分之肽/多核苷酸結合物的用量係因應活性、成為治療對象的疾病、成為投予對象的動物的種類、體重、性別、年齡、疾病的嚴重度、投予方法等而異。若以體重60kg的成人為例,在經口投予之情形,每一日的用量通常為約0.1〜約100mg,較佳為約1.0〜約50mg,更佳為約1.0〜約20mg,在非經口投予之情形,每一日的用量通常為約0.01〜約30mg,較佳為約0.1〜約20mg,更佳為約0.1〜約10mg。在對其他動物進行投予之情形中,使用將上述用量換算成每單位體重的用量後,乘以成為投予對象的動物的體重而得的用量。
藉由將本實施形態之醫藥組成物投予至病原體感染症或癌的患者、有罹患癌或病原体感染症的可能性的對象,而使接受該投予的對象中的細胞毒性T淋巴球(CTL)抗原特異性地活化,誘導該抗原特異性抗體產生,亦即,藉由誘導溫血動物(較佳為人類)的防禦免疫反應,而可預防/治療該感染症或癌。亦即,該組成物有用於作為上述感染症、癌等疾病的預防或治療用的疫苗。在本發明中,用語「腫瘤」及「癌」能交換使用。又,在本發明中,有時將腫瘤、惡性腫瘤、癌、惡性新生物、癌腫、肉瘤等統稱表現為「腫瘤」或「癌」。又,用語「腫瘤」及「癌」中亦包含骨髓增生異常症候群等,依據情形亦包含被區分在前癌階段的病態。
成為治療對象的腫瘤的種類,只要為確認對本發明的醫藥組成物具感受性的腫瘤則未被特別限定,但可列舉乳癌、結腸癌、前列腺癌、肺癌(包含小細胞肺癌、非小細胞肺癌等)、胃癌、卵巢癌、子宮頸癌、子宮內膜癌、子宮體癌、腎癌、肝細胞癌、甲狀腺癌、食道癌、骨肉瘤、皮膚癌(包含黑色素瘤等)、神經膠母細胞瘤(glioblastoma)、神經胚細胞瘤、卵巢癌、頭頸部癌、睪丸腫瘤、大腸癌、血癌(包含白血病、惡性淋巴瘤、多發性骨髓瘤等)、視網膜胚細胞瘤、胰臟癌等。
本實施形態之醫藥組成物亦可與其他抗腫瘤劑組合使用。可列舉例如,抗腫瘤抗生素、抗腫瘤性植物成分、BRM(Biological Response Modifier:生物學的反應性控制物質)、荷爾蒙、維生素、抗腫瘤性抗體、分子標靶藥物、烷化劑、代謝拮抗劑、其他抗腫瘤劑等。
更具體而言,作為烷化劑,可列舉例如,氮芥類(nitrogen mustard)、氮芥類N-氧化物、苯達莫司汀(bendamustine)或者氯芥苯丁酸(chlorambucil)等烷化劑、卡巴醌(carboquone)或者塞替派(thiotepa)等吖系烷化劑、二溴甘露醇(dibromomannitol)或者二溴半乳糖醇(dibromodulcitol)等環氧化物系烷化劑、卡莫司汀(carmustine)、洛莫司汀(lomustine)、司莫司汀(semustine)、鹽酸尼莫司汀(nimustine hydrochloride)、鏈佐黴素(streptozotocin)、氯脲黴素(chlorozotocin)或者雷莫司汀(ranimustine)等亞硝基脲系烷化劑、硫酸布他卡因(busulfan)、英丙舒凡甲苯磺酸鹽(improsulfan tosilate)、替莫唑胺(temozolomide)或達卡巴仁(dacarbazine)等。
作為各種代謝拮抗劑,可列舉例如,6-巰基嘌呤、6-硫鳥嘌呤或者硫肌苷(thioinosine)等嘌呤代謝拮抗劑、氟尿嘧啶、替加氟(tegafur)、替加氟‧尿嘧啶、卡莫氟(carmofur)、去氧氟尿苷(doxifluridine)、溴尿苷、阿糖胞苷(cytarabine)或者伊洛胞苷(enocitabin)等嘧啶代謝拮抗劑、胺甲喋呤(methotrexate)或者三甲曲沙(trimetrexate)等葉酸代謝拮抗劑等。
作為抗腫瘤性抗生素,可列舉例如,絲裂黴素C(mitomycin C)、博萊黴素(bleomycin)、培洛黴素(peplomycin)、道諾黴素(daunorubicin)、阿克拉黴素(aclarubicin)、阿黴素(doxorubicin)、艾達黴素(idarubicin)、畢拉魯比辛(pirarubicin)、THP-阿德力黴素(THP-adriamycin)、4’-表阿黴素(4’-epidoxorubicin)或者泛艾黴素(epirubicin)、色黴素(chromomycin)A3或放線菌素D(actinomycin D)等。
作為抗腫瘤性植物成分及其等的衍生物,可列舉例如,長春地辛(vindesine)、長春新鹼(vincristine)或者長春鹼(vinblastine)等長春花生物鹼(vinca alkaloid)類、紫杉醇(paclitaxel)、多烯紫杉醇(docetaxel)、卡巴他賽(cabazitaxel)等紫杉烷(taxane)類、或依托泊(etoposide)或者替尼泊甙(teniposide)等鬼臼毒素(epipodophyllotoxin)類。
作為BRM,可列舉例如,腫瘤壞死因子或吲哚美辛(indomethacin)等。
作為荷爾蒙,可列舉例如,氫化可體松(hydrocortisone)、地塞米松(dexamethasone)、甲基培尼皮質醇(methylprednisolone)、去氫皮質醇(prednisolone)、去氫異雄甾酮(prasterone)、貝他美沙松(betamethasone)、曲安西隆(triamcinolone)、羥甲睪丸素(oxymetholone)、諾隆(nandrolone)、美替諾隆(metenolone)、磷雌酚(fosfestrol)、乙炔雌二醇(ethynyl estradiol)、氯地孕酮(chlormadinone)、美雄酮(mepitiostane)或甲羥助孕酮(medroxyprogesterone)等。
作為維生素,可列舉例如,維生素C或維生素A等。
作為抗腫瘤性抗體、分子標靶藥物,可列舉曲妥珠單抗(trastuzumab)、利妥昔單抗(rituximab)、西妥昔單抗(cetuximab)、帕尼單抗(panitumumab)、尼妥珠單抗(nimotuzumab)、地諾單抗(denosumab)、貝伐單抗(bevacizumab)、英夫利昔單抗(infliximab)、伊匹單抗(ipilimumab)、納武單抗(nivolumab)、帕博利珠單抗(pembrolizumab)、阿維魯單抗(avelumab)、匹利珠單抗(pidilizumab)、阿特珠單抗(atezolizumab)、雷莫蘆單抗(ramucirumab)、甲磺酸伊馬替尼(imatinib mesylate)、達沙替尼(dasatinib)、舒尼替尼 (sunitinib)、拉帕替尼(lapatinib)、達拉非尼(dabrafenib)、曲美替尼(trametinib) 、考比替尼(cobimetinib)、帕唑帕尼(pazopanib)、帕博西尼(palbociclib)、帕比司他(panobinostat)、索拉非尼(sorafenib)、克唑替尼(crizotinib)、維羅非尼(vemurafenib)、奎軋替尼(quizartinib)、硼替佐米(bortezomib)、卡非佐米(carfilzomib)、伊克昔佐米(ixazomib)、米哚妥林(midostaurin)、吉列替尼(gilteritinib)等。
作為其他抗腫瘤劑,可列舉例如,順鉑(cisplatin)、卡鉑(carboplatin)、奧沙利鉑(oxaliplatin)、它莫西芬(tamoxifen)、來曲唑(letrozole)、阿那曲唑(arastrozole)、依西美坦(exemestane)、枸櫞酸托瑞米芬(toremifene citrate)、氟維司群(fulvestrant)、比卡魯胺(bicalutamide)、氟他胺(flutamide)、密妥坦(mitotane)、亮丙瑞林(leuprorelin)、醋酸戈舍瑞林(goserelin acetate)、喜樹鹼(camptothecin)、依弗醯胺(ifosfamide)、環磷酸醯胺(cyclophosphamide)、黴法蘭(melphalan)、L-天冬醯胺酸酶、醋葡醛內酯(aceglatone)、西佐喃(sizofiran)、必醫你舒(picibanil)、丙卡巴肼(procarbazine)、哌泊溴烷(pipobroma)、新制癌菌素(neocarzinostatin)、羥基脲、烏苯美司(ubenimex)、沙利度胺(thalidomide)、來那度胺(lenalidomide)、泊馬度胺(pomalidomide)、艾日布林(eribulin)、視網酸或雲芝多糖(krestin)等。
作為成為治療對象的感染症的種類,例示由病毒、真菌、細菌等病原體所致之感染症。作為病毒,例示流行性感冒病毒、肝炎病毒、人類免疫不全病毒(HIV)、RS病毒、風疹病毒、麻疹病毒、流行性腮腺炎病毒、疱疹病毒、小兒麻痺病毒、輪狀病毒、日本腦炎病毒、水痘病毒、腺病毒(Adenoviridae)、狂犬病病毒、黃熱病病毒等。作為細菌,可列舉白喉桿菌、破傷風菌、百日咳菌、流行性感冒桿菌、結核桿菌、肺炎球菌、幽門螺旋桿菌、炭疽桿菌、傷寒沙門桿菌、腦膜炎雙球菌、痢疾桿菌(dysentery bacillus)、霍亂弧菌等。作為真菌,例示念珠菌真菌、組織漿菌真菌、隱球菌真菌、麴菌真菌等。此等感染症的既存治療藥物與本發明的醫藥組成物可組合使用。
本實施形態之醫藥組成物與佐劑或其他醫藥組合而投予之情形,意指在某一定期間中,被投予對象將兩藥劑攝取進其體內。可投予兩藥劑被包含在單一製劑中而成的製劑,又亦可個別進行製劑化並分別投予。在個別進行製劑化之情形,其投予的時期並未被特別限定,可同時投予,亦可相隔一段時間而在不同時間或不同日投予。在分別不同時間或日投予之情形,其投予的順序並未被特別限定。通常,個別的製劑係遵照個別的投予方法進行投予,因此其等的投予有時是相同次數,亦有時成為不同次數。又,分別被個別製劑化之情形,各製劑的投予方法(投予路徑)可相同,亦可利用不同投予方法(投予路徑)進行投予。又,不需要兩藥劑同時存在於體內,只要在某一定期間(例如1個月,較佳為1週,進一步較佳為數日,進一步更佳為1日)之間被攝取進體內即可,可在投予任一者時另一有效成分已從體內消失。
[實施例]
接著,針對為了確認本發明的作用效果而進行的實施例進行說明。此外,在本實施例中,「CpG DNA(S)」表示具有包含CpG模體的鹼基序列且磷酸二酯鍵被硫代磷酸酯鍵取代之DNA衍生物(多核苷酸衍生物的一例)。在實施例所記載之化學結構式中,多核苷酸衍生物標記成一文字鹼基序列標記及左側成為5’末端側(右側成為3’末端側),肽係除了N端的半胱胺酸以外標記成三文字標記及左側成為N端側(右側成為C末端側)。在一文字鹼基序列標記的多核苷酸衍生物中,磷酸二酯鍵皆被硫代磷酸酯鍵取代,又,末端結構,在與間隔子結合之情形係意指到末端核苷的5’或3’羥基的氧原子為止,而在未與間隔子結合之情形係意指末端核苷的5’或3’羥基(包含氫原子)。又,本實施例中之CpG DNA(S)-肽結合物係作為三乙基胺及乙酸加成的鹽而製備。
實施例1:CpG DNA(S)-肽結合物的製備
使利用任意公知的方法所合成之胺基修飾CpG DNA(S)(在5’末端導入具有由下述式所表示之結構的胺基之CpG DNA(S)衍生物。鹼基序列:ATCGACTCTCGAGCGTTCTCAT CGACTCTCGAGCGTTCTC(序列編號229:以下簡稱為「CpG40(S)」)。磷酸二酯鍵皆為硫代磷酸酯鍵)1mol、與琥珀醯亞胺基6-[3’-(2-吡啶基二硫基)-丙醯胺基]己酸酯(succinimidyl 6-[3’-(2-pyridyldithio)propionamido] hexanoate, LC-SPDP)30mol在磷酸緩衝液(pH8.0)中進行混合。在40℃靜置3小時後,使用NAP-5管柱,精製SPDP修飾CpG DNA(S)。
將由下述式所表示之結構,以下簡稱為「ssH胺基連接子」。
相對於SPDP修飾CpG DNA(S)1mol,以25mol的比例,使源自卵白蛋白(OVA)的具有抗原性的肽(第257〜264個胺基酸;胺基酸序列:SIINFEKL:序列編號196)的N末側已加成半胱胺酸的肽(胺基酸序列:CSIINFEKL(序列編號250:以下簡稱為「OVApep9」))在30%N,N-二甲基甲醯胺(DMF)水溶液中進行混合。使其在40℃靜置3小時後,以HPLC分取CpG DNA(S)-肽結合物。HPLC的條件係將A液設為0.1M乙酸三乙銨(TEAA;pH 7.0)、將B液設為乙腈,管柱使用ZORBAX Eclipse Plus C18,並利用以下梯度條件進行。
0分鐘 A:90% B:10%
〜 25分鐘 70% 30%
〜 30分鐘 0% 100%
在將使用HPLC的SPDP修飾CpG DNA(S)、與源自OVA的肽之反應後的溶液進行分取中,偵測係藉由監測dA40(S)的260 nm的吸收而進行。分取後的CpG DNA(S)-肽結合物的溶出時間係確認到比SPDP修飾CpG DNA(S)慢。此被認為係因為因與疏水性的肽結合而溶出時間變慢。又,分取後的層析圖中未見到未反應的SPDP修飾CpG DNA(S)的峰,僅偵測到CpG DNA(S)-肽結合物的峰,由此確認到純度高地獲得目標的CpG DNA(S)-肽結合物(CpG40(S)-OVApep9結合物:結構式參照下述)。
實施例2:由CpG DNA(S)-肽結合物所致之細胞毒性T細胞誘導的評價
作為抗原,將CpG DNA(S)-肽結合物皮內投予至小鼠(C57BL/6小鼠(♂、7週齡))(每一隻20 ng,1次)。從投予起1週後,在同系統的小鼠之中,從未進行投予的個體取出脾細胞,將此分成二組,另一方面,作為抗原,添加源自卵白蛋白(蛋白白蛋白、OVA)的具有抗原性的肽(肽序列;SIINFEKL:序列編號196),靜置90分鐘,藉此製作抗原保持脾細胞,將未添加肽的脾細胞作為抗原未保持脾細胞。使用5,6-羧基螢光素琥珀醯亞胺酯(5,6-Carboxyfluorescein succinimidyl ester,CFSE),將抗原保持脾細胞及抗原未保持脾細胞二者進行螢光修飾。此時,藉由改變CFSE的濃度,抗原保持脾細胞(CFSE:5μM)的螢光強度變得高於抗原未保持脾細胞(CFSE:0.5μM)。將投予抗原保持脾細胞、抗原未保持脾細胞分別同數量混合,作為抗原,對於已投予CpG DNA(S)-肽結合物的小鼠個體,在從投予起1週後進行尾靜脈投予。CpG DNA(S)-肽結合物的投予量,每一隻以肽換算為20 ng(此情形,CpG40(S)換算為250 ng)。
在由上述尾靜脈投予起經過24小時後,從小鼠取出脾細胞,以流動式細胞測量術將抗原保持脾細胞與抗原未保持脾細胞進行定量,評價抗原保持脾細胞的減少量,藉此評價經誘導的細胞毒性T細胞的活性。將流動式細胞測量術的測定結果示於圖1(圖1(b))。為了比較,取代CpG DNA(S)-肽結合物,作為對照組,使用投予PBS(磷酸緩衝生理食鹽水)的小鼠個體(圖1(a))、個別投予具有抗原性的肽與CpG DNA(S)的小鼠個體,以同樣條件進行,將測定結果一併揭示於圖1(圖1(c))。
如圖1(a)所示,在由已投予PBS的小鼠個體所採取之脾細胞中,包含相同數量的抗原保持脾細胞與未保持脾細胞的比例,如圖1(b)所示,從由已投予CpG DNA(S)-肽結合物的小鼠個體所採取之脾細胞,抗原保持脾細胞的約95%消失。由此可知,藉由CpG DNA(S)-肽結合物的投予,對肽抗原誘導特異性免疫反應。又,由與圖1(c)的比較可知,其效果高於個別投予具有抗原性的肽與CpG DNA(S)之小鼠個體。
實施例3:CpG DNA(S)-肽結合物的投予量依賴性
變更CpG DNA(S)-肽結合物的投予量,對小鼠進行免疫,與實施例2同樣地,以流動式細胞測量術將由小鼠個體所採取的脾細胞中之抗原保持脾細胞、抗原未保持脾細胞之比例進行定量,其中該小鼠個體已尾靜脈投予將投予抗原保持脾細胞、抗原未保持脾細胞分別同數量混合者;並評價抗原保持脾細胞的減少量,藉此,評價經誘導的細胞毒性T細胞的活性。
將流動式細胞測量術的測定結果示於圖2。可知若使CpG DNA(S)-肽結合物的投予量以肽換算低於20 ng,則慢慢地該效果消失。一般的肽免疫需要數μg的投予量,但由實施例1所製作之CpG DNA(S)-肽結合物中,成功使其投予量減少至100分之1〜1000分之1。
實施例4:CpG DNA(S)-肽結合物所含之CpG DNA(S)的鹼基長及鹼基序列依賴性
作為CpG DNA(S)-肽結合物所含之CpG DNA(S),除了實施例1所使用的鹼基長40者(鹼基序列:ATCGACTCTCGAGCGTTCTCATCGACTCTCGAGCGTTCTC(序列編號229:以下簡稱為「CpG40(S)」))以外,變更成鹼基長30者(鹼基序列:GAGCGTTCTCATCGACTCTCG AGCGTTCTC(序列編號227:以下簡稱為「CpG30(S)a」)者及鹼基序列:ATCGACTCTCGAGCGTTCTCGA GCGTTCTC(序列編號228:以下簡稱為「CpG30(S)b」)者)、鹼基長24者(鹼基序列:TCTCGAGCGTTCTCGA GCGTTCTC(序列編號225:以下簡稱為「CpG24(S)」)者)及鹼基長20者(序列編號222:鹼基序列:ATCGACTCTCGAGCGTTCTC(以下簡稱為「CpG20(S)a」)者及鹼基序列:GAGCGTTCTCGAGCGTTCTC(序列編號223:以下簡稱為「CpG20(S)b」)者)(結構式參照下述),分別以與實施例1同樣的方法製作CpG DNA(S)-肽結合物(關於結構式、鹼基序列,參照下式及下述表9。在表9中,帶有粗體且底線的鹼基序列為CpG模體。磷酸二酯鍵皆為硫代磷酸酯鍵)。
[表9]
使用CpG DNA(S)的鹼基長不同之CpG DNA(S)-肽結合物(以肽換算為每一隻20 ng),將小鼠個體進行免疫,與實施例2同樣地,以流動式細胞測量術將尾靜脈投予至小鼠個體的抗原保持脾細胞、抗原未保持脾細胞之比例進行定量,評價抗原保持脾細胞的減少量,藉此評價經誘導的細胞毒性T細胞的活性。
將流動式細胞測量術的測定結果示於圖3、4。可知即使將CpG DNA(S)的鹼基長縮短至30,抗原保持脾細胞亦完全消失。在使CpG DNA(S)的鹼基長減少至20之情形、CpG DNA(S)所含之CpG模體的數僅一個之情形,未見到抗原保持脾細胞的減少,但在CpG DNA(S)所含之CpG模體的數為二個之情形,觀測到抗原保持脾細胞的減少,可知肽特異性細胞毒性T細胞的活性被誘導。
實施例5:CpG DNA(S)-肽結合物所含之肽的胺基酸長依賴性
在由實施例1所製備之CpG DNA(S)-肽結合物中,將具有抗原性的肽在N端側延長,使用胺基酸長18(胺基酸序列:CEVSGLEQLESIINFEKL(序列編號251:以下簡稱為「OVApep18」))、胺基酸長27(胺基酸序列:CMSMLVLLPDEVSGLEQLESIINFEKL(序列編號252:以下簡稱為「OVApep27」))的肽,製備CpG DNA(S)-肽結合物(結構式參照下述),使用此(以肽換算為每一隻20 ng)將小鼠個體進行免疫,與實施例2同樣地,以流動式細胞測量術將尾靜脈投予至小鼠個體的抗原保持脾細胞、抗原未保持脾細胞的比例進行定量,評價抗原保持脾細胞的減少量,藉此評價經誘導的細胞毒性T細胞的活性。
將流動式細胞測量術的測定結果示於圖5。可知若將具有抗原性的肽的胺基酸長延長至18或27,則肽特異性細胞毒性T細胞的活性有降低的傾向。
實施例6:CpG DNA(S)-肽結合物對於間隔子的結構及肽的結合位置之依賴性
在實施例1所製備之CpG DNA(S)-肽結合物中,使用將ssH胺基連接子變更成下述結構(以下簡稱為「C6胺基連接子」)之CpG DNA(S)-肽結合物(以下稱為化合物(I))、在CpG DNA(S)與ssH胺基連接子之間插入具有PEG的C18間隔子之CpG DNA(S)-肽結合物、不在CpG DNA(S)的5’側而是在3’末端經由與化合物(I)相同的間隔子結構而共價結合有具有抗原性的肽之CpG DNA(S)-肽結合物,藉由與實施例2同樣的流程,評價經誘導的細胞毒性T細胞的活性。其結果,即使在任一情形中,皆確認到與由實施例1所製備之CpG DNA(S)-肽結合物相同程度的強肽特異性細胞毒性T細胞的活性被誘導。
實施例7:腹腔巨噬細胞中之抗原呈現量的評價
將由小鼠所採取的腹腔巨噬細胞取至48孔盤(1.5×105
細胞/孔),將使用胺基酸長不同之具有抗原性的肽(OVApep9、OVApep18、OVApep27)及鹼基長不同之CpG DNA(S)(CpG40(S)、CpG30(S)a、CpG30(S)b、CpG20(S)a)所製備的CpG DNA(S)-肽結合物以肽換算2μg/mL而添加至孔中,培養24小時。培養後,在OVApep8與MHC的分子複合物中添加特異性抗體(以藻紅素(PE)螢光標識:(以下,簡稱為「經PE標記的 H-2Kb
/FIINFEKL」)),以流動式細胞測量術進行結合有抗體之腹腔巨噬細胞的定量,進行抗原呈現量的評價。
將流動式細胞測量術的測定結果示於圖6及7。由此等結果確認到,CpG DNA(S)的鹼基長幾乎不對抗原呈現量造成影響,若具有抗原性的肽的胺基酸長變長且成為18或27,則抗原呈現量有減少的傾向。又,確認到圖7中由「CpG40(S)-PEG-OVApep9」所示之在間隔子具有聚氧乙烯(polyoxyethylene)基的CpG40(S)-OVApep9結合物中,往間隔子的聚氧乙烯基幾乎不對抗原呈現量造成影響。
無。
圖1係顯示實施例2中之流動式細胞測量術的測定結果之圖。
圖2係顯示實施例3中之流動式細胞測量術的測定結果之圖。
圖3係顯示實施例4中之流動式細胞測量術的測定結果之圖。
圖4係顯示實施例4中之流動式細胞測量術的測定結果之圖。
圖5係顯示實施例5中之流動式細胞測量術的測定結果之圖。
圖6係顯示實施例7中之流動式細胞測量術的測定結果之圖。
圖7係顯示實施例7中之流動式細胞測量術的測定結果之圖。
Claims (14)
- 一種免疫誘導劑,其特徵在於,包含多核苷酸/肽結合物作為有效成分,該多核苷酸/肽結合物係將包含CpG模體的單鏈多核苷酸或多核苷酸衍生物與具有抗原性的肽經由間隔子(spacer)而結合,該間隔子係在一端側與該多核苷酸或多核苷酸衍生物共價結合且在另一端側與該具有抗原性的肽共價結合;該具有抗原性的肽的胺基酸長為5以上且30以下;該間隔子包含由下述式所表示之重複單元,
在上述式中,X表示氧原子或硫原子(於此各X可相同亦可相異),R表示(CH2)pO、(CH2)qNH、(CH2CH2O)m之任一者(m、p及q分別獨立表示10以下的自然數),n表示10以下的自然數;構成該多核苷酸/肽結合物之該具有抗原性的肽、及與該多核苷酸或多核苷酸衍生物結合的該間隔子係經由雙硫鍵而結合,該雙硫鍵係藉由該具有抗原性的肽的N端的半胱胺酸殘基 的硫醇基與該間隔子所具有的硫醇基之反應而生成。 - 如請求項1之免疫誘導劑,其中,該具有抗原性的肽的胺基酸長為8以上且11以下。
- 如請求項1或2之免疫誘導劑,其中,該多核苷酸或多核苷酸衍生物為包含2個以上的CpG模體之聚去氧核糖核苷酸(DNA)或DNA衍生物。
- 如請求項1或2之免疫誘導劑,其中,該多核苷酸或多核苷酸衍生物的鹼基長為15以上且40以下。
- 如請求項1或2之免疫誘導劑,其中,該多核苷酸或多核苷酸衍生物的鹼基長為20以上且30以下。
- 如請求項1或2之免疫誘導劑,其中,該多核苷酸或多核苷酸衍生物為磷酸二酯鍵的至少一部分被硫代磷酸酯鍵(phosphorothioate bond)取代之多核苷酸衍生物。
- 如請求項6之免疫誘導劑,其中,在該磷酸二酯鍵的至少一部分被硫代磷酸酯鍵取代之多核苷酸衍生物中,磷酸二酯鍵的50%以上被硫代磷酸酯鍵取代。
- 如請求項6之免疫誘導劑,其中,在該磷酸二酯鍵的至少一部分被硫代磷酸酯鍵取代之多核苷酸衍生物中,磷酸二酯鍵的90%以上被硫代磷酸酯鍵取代。
- 如請求項1或2之免疫誘導劑,其中,該間隔子與該多核苷酸或多核苷酸衍生物之間的共價結合為在活體環境中能剪切的共價結合。
- 如請求項1或2之免疫誘導劑,其進一步包含具有免疫賦活活性的物質作為佐劑。
- 如請求項1之免疫誘導劑,其中該具有抗原性的肽的胺基酸長為8以上且11以下;該多核苷酸或多核苷酸衍生物為包含2個以上的CpG模體之聚去氧核糖核苷酸(DNA)或DNA衍生物;該多核苷酸或多核苷酸衍生物的鹼基長為20以上且30以下; 該多核苷酸或多核苷酸衍生物為磷酸二酯鍵的至少一部分被硫代磷酸酯鍵取代之多核苷酸衍生物;在該磷酸二酯鍵的至少一部分被硫代磷酸酯鍵取代之多核苷酸衍生物中,磷酸二酯鍵的90%以上被硫代磷酸酯鍵取代。
- 一種醫藥組成物,其包含如請求項1至12中任一項之免疫誘導劑。
- 一種用於腫瘤治療的醫藥組成物,其包含如請求項1至12中任一項之免疫誘導劑。
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