JP5572938B2 - 免疫誘導剤 - Google Patents
免疫誘導剤 Download PDFInfo
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- JP5572938B2 JP5572938B2 JP2008272705A JP2008272705A JP5572938B2 JP 5572938 B2 JP5572938 B2 JP 5572938B2 JP 2008272705 A JP2008272705 A JP 2008272705A JP 2008272705 A JP2008272705 A JP 2008272705A JP 5572938 B2 JP5572938 B2 JP 5572938B2
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Description
(a) 配列表の配列番号2又は4に示されるアミノ酸配列を有するポリペプチド中の連続する7個以上のアミノ酸から成り、免疫誘導活性を有するポリペプチド。
(b) (a)のポリペプチドと80%以上の相同性を有し、7個以上のアミノ酸から成る、免疫誘導活性を有するポリペプチド。
(c) (a)又は(b)のポリペプチドを部分配列として含み、免疫誘導活性を有するポリペプチド。
(1)cDNAライブラリの作製
健常な犬の精巣組織から酸−グアニジウム−フェノール−クロロフォルム法(Acid guanidium-Phenol-Chloroform法)により全RNAを抽出し、Oligotex-dT30 mRNA purification Kit(宝酒造社製)を用いてキット添付のプロトコールに従ってポリA RNAを精製した。
上記作製したイヌ精巣由来cDNAファージライブラリを用いて、イムノスクリーニングを行った。具体的にはΦ90×15mmのNZYアガロースプレートに2340クローンとなるように宿主大腸菌(XL1-Blue MRF')に感染させ、42℃、3〜4時間培養し、溶菌斑(プラーク)を作らせ、IPTG(イソプロピル−β−D−チオガラクトシド)を浸透させたニトロセルロースメンブレン(Hybond C Extra: GE Healthecare Bio-Science社製)でプレートを37℃で4時間覆うことによりタンパク質を誘導・発現させ、メンブレンにタンパク質を転写した。その後メンブレンを回収し0.5%脱脂粉乳を含むTBS(10mM Tris-HCl,150mM NaCl pH7.5)に浸し4℃で一晩振盪することによって非特異反応を抑制した。このフィルターを500倍希釈した患犬血清と室温で2〜3時間反応させた。
上記方法により単離した1個の陽性クローンを塩基配列解析に供するため、ファージベクターからプラスミドベクターに転換する操作を行った。具体的には宿主大腸菌(XL1-Blue MRF')を吸光度OD600が1.0となるよう調製した溶液200μlと、精製したファージ溶液100μlさらにExAssist helper phage (STRATAGENE社製)1μlを混合した後37℃で15分間反応後、LB培地を3ml添加し37℃で2.5〜3時間培養を行い、直ちに70℃の水浴にて20分間保温した後、4℃、1000×g、15分間遠心を行い上清をファージミド溶液として回収した。次いでファージミド宿主大腸菌(SOLR)を吸光度OD600が1.0となるよう調製した溶液200μlと、精製したファージ溶液10μlを混合した後37℃で15分間反応させ、50μlをアンピシリン(終濃度50μg/ml)含有LB寒天培地に播き37℃一晩培養した。トランスフォームしたSOLRのシングルコロニーを採取し、アンピシリン(終濃度50μg/ml)含有LB培地37℃にて培養後、QIAGEN plasmid Miniprep Kit(キアゲン社製)を使って目的のインサートを持つプラスミドDNAを精製した。
上記方法により得られた遺伝子に対しイヌおよびヒトの正常組織および各種細胞株における発現をRT-PCR(Reverse Transcription-PCR)法により調べた。逆転写反応は以下の通り行なった。すなわち、各組織50−100mgおよび各細胞株5−10×106個の細胞からTRIZOL試薬(invitrogen社製)を用いて添付のプロトコールに従い全RNAを抽出した。この全RNAを用いてSuperscript First-Strand Synthesis System for RT-PCR(invitrogen社製)により添付のプロトコールに従いcDNAを合成した。ヒト正常組織(脳、海馬、精巣、結腸、胎盤)のcDNAは、ジーンプールcDNA(invitrogen社製)、QUICK-Clone cDNA(クロンテック社製)およびLarge-Insert cDNA Library(クロンテック社製)を用いた。PCR反応は、取得したイヌ遺伝子及びそのヒト相同遺伝子に特異的なプライマー(配列番号7および8に記載)を用いて以下の通り行った。すなわち、逆転写反応により調製したサンプル0.25μl、上記プライマーを各2μM、0.2mM各dNTP、0.65UのExTaqポリメラーゼ(宝酒造社製)となるように各試薬と添付バッファーを加え全量を25μlとし、Thermal Cycler(BIO RAD社製)を用いて、94℃―30秒、55℃―30秒、72℃―1分のサイクルを30回繰り返して行った。なお、上記した配列番号7及び8に示す塩基配列を有する遺伝子特異的プライマーは、配列番号1の塩基配列中の87番〜606番および配列番号3の塩基配列中の173番〜695番塩基の領域を増幅するものであり、該プライマーを用いてイヌ遺伝子及びそのヒト相同遺伝子のいずれの発現も調べることができるものであった。比較対照のため、GAPDH特異的なプライマー(配列番号9および10に記載)も同時に用いた。その結果、図1に示すように、取得したイヌ遺伝子は、健常なイヌ組織では精巣に強い発現が見られ、一方イヌ乳癌細胞株で強い発現が見られた。ヒト相同遺伝子の発現も、イヌ遺伝子と同様、ヒト正常組織で発現が確認できたのは精巣のみだったが、ヒト癌細胞では脳腫瘍、白血病、乳癌、肺癌で発現が検出され、ヒト相同遺伝子も精巣と癌細胞に特異的に発現していることが確認された。
(1)組換えタンパク質の作製
実施例1で取得した配列番号1の遺伝子を基に、以下の方法にて組換えタンパク質を作製した。PCRは、実施例1で得られたファージミド溶液より調製し配列解析に供したベクターを1μl、NdeIおよびXhoI制限酵素切断配列を含む2種類のプライマー(配列番号11および12に記載)を各0.4μM、0.2mM dNTP、1.25UのPrimeSTAR HSポリメラーゼ(宝酒造社製)となるように各試薬と添付バッファーを加え全量を50μlとし、Thermal Cycler (BIO RAD社製)を用いて、98℃―10秒、55℃―15秒、72℃―1分のサイクルを30回繰り返すことにより行った。なお、上記2種類のプライマーは、配列番号2のアミノ酸配列全長をコードする領域を増幅するものであった。PCR後、増幅されたDNAを1%アガロースゲルにて電気泳動し、QIAquick Gel Extraction Kit (QIAGEN社製)を用いて約930bpのDNA断片を精製した。
上記で得られた、配列番号1および配列番号3を発現するそれぞれの組換え大腸菌を100μg/mL アンピシリン含有LB培地にて600nmでの吸光度が0.7付近になるまで37℃で培養後、イソプロピル-β-D-1-チオガラクトピラノシド終濃度が1 mMとなるよう添加し、さらに37℃で4時間培養した。その後4800rpmで10分間遠心し集菌した。この菌体ペレットをリン酸緩衝化生理食塩水に懸濁し、さらに4800rpmで10分間遠心し菌体の洗浄を行った。
(1)抗腫瘍評価
表皮に腫瘤を持つ担癌患犬2頭(乳腺腫瘍2頭)に対して、上記で精製した2種類の組換えタンパクの抗腫瘍効果の評価を行った。
上記(1)での投与試験で抗腫瘍効果が得られた患犬の血液を、癌治療剤投与前並びに初回投与から10日後及び30日後の各時点で採取し、常法に従って末梢血単核球を分離し、それを用いたIFNγのエリスポットアッセイ法により、投与した各組換えタンパクについて免疫誘導能の評価を行った。
Claims (5)
- 配列表の配列番号2又は4に示されるアミノ酸配列を有するポリペプチド又は該ポリペプチドをコードするポリヌクレオチドを含み生体内で該ポリペプチドを発現可能な組換えベクターを有効成分として含有する、癌の治療及び/又は予防剤。
- ポリペプチドを有効成分として含有する請求項1記載の癌の治療及び/又は予防剤。
- ヒト、イヌ又はネコ用である請求項1又は2記載の癌の治療及び/又は予防剤。
- 免疫増強剤をさらに含む請求項1ないし3のいずれか1項に記載の癌の治療及び/又は予防剤。
- 前記免疫増強剤が、フロイントの不完全アジュバント、モンタニド、ポリICおよびその誘導体、CpGオリゴヌクレオチド、インターロイキン12、インターロイキン18、インターフェロンα、インターフェロンβ、インターフェロンω、インターフェロンγ並びにFlt3リガンドから成る群より選ばれる少なくとも一つである請求項4記載の癌の治療及び/又は予防剤。
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