JP4713933B2 - イエダニ由来のアレルゲン - Google Patents
イエダニ由来のアレルゲン Download PDFInfo
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- JP4713933B2 JP4713933B2 JP2005130955A JP2005130955A JP4713933B2 JP 4713933 B2 JP4713933 B2 JP 4713933B2 JP 2005130955 A JP2005130955 A JP 2005130955A JP 2005130955 A JP2005130955 A JP 2005130955A JP 4713933 B2 JP4713933 B2 JP 4713933B2
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Images
Classifications
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Description
このことは、交差反応性ポリペプチドが、交差反応性ポリペプチドに曝露された個体においてアレルギー反応か少なくとも感作を誘発しうることを意味している。
本発明によれば、配列比較は、少なくとも40アミノ酸、好ましくは少なくとも80アミノ酸、より好ましくは少なくとも100アミノ酸、最も好ましくは少なくとも120アミノ酸をカバーする。
(i)最初の曝露により、アレルギー性タンパク質が、B細胞によるIgE合成を誘導する(VercelliとGeha(1989),J.Allergy Clin.Immunol.9,75〜83頁)。これらの特異的IgE抗体は次に高親和性Fcε受容体(FcεRI)を介して、肥満細胞および好塩基球の表面に結合する。
(ii)次の曝露により、アレルゲンは上記特異的IgE抗体に結合して架橋し、前形成および新しく合成された炎症媒介物(例えばヒスタミン)および化学走化性物質(例えば血小板活性化因子)の放出を導く。
本発明によれば、配列比較は、少なくとも50ヌクレオチド、好ましくは少なくとも100ヌクレオチド、より好ましくは少なくとも200ヌクレオチド、最も好ましくは少なくとも300ヌクレオチドをカバーする。
成熟型の新規アレルゲンをコードするクローン25(図1A)のcDNAを、発現ベクターpET−17b(Novagene,ウィスコンシン州マジソン)中にクローニングし、大腸菌BL21(DE3)(Stratagene,カリフォルニア州ラ・ホヤ)中で発現させた。細菌細胞は、OD600が0.6〜0.8に達するまで、100mg/mlアンピシリンを含むLB培地中で培養した。組み換えタンパク質の発現は、イソプロピル−ベータ−チオガラクトピラノシド(IPTG)を最終濃度0.5mMとなるように加え、37℃でさらに3時間培養することによって誘導した。1リットルの培養液からの大腸菌細胞を遠心分離により回収し、10mLの25mMイミダゾールpH7.4,0.1%TritonX100中に再懸濁し、室温で20分間、100μgリゾチームによる処理を行った。細菌細胞の溶解物を液体窒素中で凍結させ、50℃の水槽中で解凍した。ゲノムDNAは、1μg DNaseを添加することにより、室温で10分間分解させ、200μLの5M NaClにより反応を停止させた。溶解した細菌細胞を18,000rpm(Sorval RC5C,SS34)、4℃で20分間遠心分離した後、可溶性タンパク質を含む画分を得た。クローン25由来アレルゲンを含む可溶性画分をバッファA(10mM Tris−Cl pH7.0,4%イソプロパノール、1mL/Lフェニル−メチル−スルフォニル−フルオリド,PMSF)に対して透析し、DEAEセファロースファストフローカラム(Amersham Biosciences,スウェーデン国ウプサラ)にアプライした。クローン25由来アレルゲンは、0〜500mM NaCl勾配によって溶出した。組み換えアレルゲンを含む画分をプールし、バッファB(10mM Na2HPO4 pH4.0、5mMβ−メルカプトエタノール、1mL/L PMSF)に対して透析し、SPセファロースファストフローカラム(Amersham Biosciences)にアプライした。クローン25由来アレルゲンをpH4.0〜7.0と0〜500mM NaClの組み合わせ勾配によって溶出し、純度90%超のクローン25でコードされたアレルゲンを含む画分をプールし、10mM Na2HPO4(pH7.0)に対して透析し、−20℃で保存した。タンパク質試料の純度は、ドデシル硫酸ナトリウム−ポリアクリルアミドゲル電気泳動(SDS−PAGE)およびクーマシーブルータンパク質染色(図1B)によって分析した。
(i)新規のアレルゲンはダニアレルギー患者血清からのIgEと結合する
クローン25cDNAによってコードされる新規なDer pアレルゲンのIgE結合能を、117人のダニアレルギー患者からの血清を用いたドットブロット実験によって解析した。新しいアレルゲンをニトロセルロース条片(1μg/ドット)上にドット状に配置し、条片をDer pアレルギー患者の血清とともにインキュベートした。結合したIgE抗体を、125I−標識抗ヒトIgE抗体を用いて検出した。
イエダニDer pのメジャーアレルゲンnDer p 1(4)およびマイナーアレルゲンrDer p 5(5)と、クローン25cDNAによってコードされる新規なアレルゲンとを、Der pアレルギー個体の好塩基球からのヒスタミン放出の誘導能力について比較した。
クローン25によってコードされる新規のアレルゲンは、他のチリダニアレルゲン(図3A)、すなわち、サヤアシニクダニ(Lepidoglyphus destructor (Lep d 5))、ネッタイタマニクダニ(Blomia tropicalis (Blo t 5))およびヤケヒョウヒダニ(Dermatophagoides
pteronyssinus (Der p 5))に由来する第5群アレルゲンに対しても相同性を示した。新規なアレルゲンとDer p 5との間のアミノ酸同一性は30%であるため、クローン25由来のアレルゲンは、いまのところは、未知の新しい群のチリダニアレルゲンに属する。ドットブロット阻害実験からは、Der p 5と新規なアレルゲンがIgEエピトープを共用しないことが実証された。1μgのDer p 5,クローン25由来アレルゲンおよびBSAを、ニトロセルロース条片上にドット状に配置した。条片を、Der p 5と新規なアレルゲンの両方に反応性を有する9人の患者の血清とともに、およびrDer p 5、クローン25由来アレルゲン、およびBSAのそれぞれ10μg/mlで予備吸着させた1つの非アレルギー患者の血清とともにインキュベートした。結合したIgE抗体を、125I標識抗ヒトIgE抗体(図3B)を用いて検出した。
新規なダニアレルゲンが免疫原性を有するかどうかを調べるために、1匹のウサギをフロイントアジュバントを用いて新規なアレルゲンで免疫化した。このウサギをフロイント完全アジュバントで1回、フロイント不完全アジュバントで2回、200μg/注射により免疫化した(Charles River,ドイツ国キスレッグ)。
1. Fernandez−Caldas E.Mite species of allergologic importance in Europe.Allergy 1997;52:383−6.
2. Thomas WR,Smith WA,Hales BJ,Mills KL,O’Brien RM.Characterization and immunobiology of house dust mite allergen.Int Arch Allergy Immunol 2002;129:1−18.
3. Valenta R.The future of antigen−specific immunotherapy of allergy.Nat Rev Immunol 2002;2:446−53.
4. Hales BJ,Shen H,Thomas WR.Cytokine responses to Der p 1 and Der p 7:house dust mite allergen with different IgE−binding activities.Clin Exp Allergy 2000;30:934−43.
5. Lin KL,Hsieh KH,Thomas WR,Chiang BL,Chua KY.Characterization of Der pV allergen,cDNA analysis,and IgE−mediated reactivity to the recombinant protein.J Allergy Clin Immunol 1994;94:989−96.
Claims (17)
- a)配列番号:1に示されるアミノ酸配列のうちの少なくとも18の連続するアミノ酸からなる断片を含むポリペプチド、
b)配列番号:1に示されるアミノ酸配列と少なくとも90%の同一性を有するアミノ酸配列を含むポリペプチド、および
c)配列番号:1に示されるアミノ酸配列のうちの少なくとも10の連続するアミノ酸からなる断片で構成されるポリペプチド、
からなる群より選択されることを特徴とするポリペプチド。 - 配列番号:1に示されるアミノ酸配列を含むことを特徴とする請求項1に記載のポリペプチド。
- 配列番号:1に示される配列の連続するアミノ酸20〜140を含むことを特徴とする請求項1に記載のポリペプチド。
- a)配列番号:1に示されるアミノ酸配列をコードするポリヌクレオチド、
b)請求項1〜3のいずれかに記載のポリペプチドをコードするポリヌクレオチド、および
c)配列番号:2に示されるヌクレオチド配列と少なくとも90%の同一性を有するヌクレオチド配列を含むポリヌクレオチド、
から成る群より選択されることを特徴とするポリヌクレオチド、または、前記ポリヌクレオチドの相補鎖。 - 配列番号:2に示されるヌクレオチド配列を含むことを特徴とする請求項4に記載のポリヌクレオチド。
- 配列番号:2に示される配列の連続するヌクレオチド81〜434を含むことを特徴とする請求項4に記載のポリヌクレオチド。
- 請求項4〜6のいずれかに記載のポリヌクレオチドを含むことを特徴とするプラスミドまたはベクター。
- 請求項7に記載のプラスミドまたはベクター、および/または、請求項4〜6のいずれかに記載のポリヌクレオチドを含むことを特徴とする細胞。
- 植物細胞、細菌細胞および酵母細胞からなる群より選択されることを特徴とする請求項8に記載の細胞。
- 請求項1〜3のいずれかに記載のポリペプチドの調製方法であって、請求項8または9に記載の細胞を、培地中でポリペプチドの発現に適した条件下で培養する工程と、それに続く随意の該細胞および/または培地からポリペプチドを回収する工程とを含むことを特徴とする方法。
- 細胞を破壊し、ポリペプチドをイオン交換クロマトグラフィーおよび/またはアフィニティクロマトグラフィーを用いて回収することを特徴とする請求項10に記載の方法。
- 請求項1〜3のいずれかに記載のポリペプチドに対する抗体。
- 請求項1〜3のいずれかに記載のポリペプチド、および/または請求項4〜6のいずれかに記載のポリヌクレオチド、および/または請求項7に記載のプラスミドまたはベクター、および/または請求項8または9に記載の細胞、および/または請求項12に記載の抗体を、随意で1つ以上の薬学的に許容される担体および/または希釈剤および/またはベヒクル及び/またはアジュバントと組み合わせて含むことを特徴とする医薬組成物。
- 請求項1〜3のいずれかに記載のポリペプチド、および/または請求項4〜6のいずれかに記載のポリヌクレオチド、および/または請求項7に記載のプラスミドまたはベクター、および/または請求項8または9に記載の細胞、および/または請求項12に記載の抗体を含む診断キット。
- アレルギー性疾患の治療、予防、または診断のための薬剤を調製するための、請求項1〜3のいずれかに記載のポリペプチド、および/または請求項4〜6のいずれかに記載のポリヌクレオチド、および/または請求項7に記載のプラスミドまたはベクター、および/または請求項8または9に記載の細胞、および/または請求項12に記載の抗体の使用。
- アレルギー性疾患が、イエダニまたは貯蔵庫ダニに対する感作またはアレルギーであることを特徴とする請求項15に記載の使用。
- 薬剤が、脱感作すべき個体に投与されることを特徴とする請求項15または16に記載の使用。
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