JP7396569B2 - Cra4S1遺伝子及びそれによってコードされるタンパク質と応用 - Google Patents
Cra4S1遺伝子及びそれによってコードされるタンパク質と応用 Download PDFInfo
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- JP7396569B2 JP7396569B2 JP2022503798A JP2022503798A JP7396569B2 JP 7396569 B2 JP7396569 B2 JP 7396569B2 JP 2022503798 A JP2022503798 A JP 2022503798A JP 2022503798 A JP2022503798 A JP 2022503798A JP 7396569 B2 JP7396569 B2 JP 7396569B2
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Description
ポルフィロモナスジンジバリス細菌ゲノムDNAには、ragAとragB遺伝子及び両端の不規則な挿入断片で構成された(図1)rag遺伝子座(rag locus)があり、ragAとragB遺伝子は、そのオープンリーディングフレームがそれぞれ独立しているが、実験により、両者に共転写関係があることが証明され、例えば、ragA遺伝子が人為突然変異されると、RagBタンパク質は正常に発現できなくなり、又は、下流のragB遺伝子が人為突然変異されると、RagAタンパク質は、細菌において正常に発現できなくなる(参照文献:PCT/GB2005/001976)。
出願人はDNA配列と設計要件を提供し、南京ジェンスクリプトバイオテック社(以下、ジェンスクリプトと略称)はヌクレオチド合成のサービスを提供した。
Cra4S1タンパク質オープンリーディングフレームベクターを含む原核発現ベクターの構築方法は、実施例1で人工的に合成されたcra4S1遺伝子断片をベクタープラスミドpET-30a(+)(南京ジェンスクリプトから購入)に接続することであり、組み換えプラスミドの構築は図2に示される。プラスミドと標的遺伝子は、何れも制限酵素NdeIとXhoIで二重酵素消化され、両方の酵素消化システムは、2つの制限酵素それぞれ2μl、10×Bufferの緩衝液4μl、プラスミドpET-30a(+)1μg又はcra4S1遺伝子断片1μgであり、ddH2Oで40μlまで補足し、37℃で2 h水浴した。DNA断片をアガロースゲル電気泳動により精製して回収し、ベクターと標的遺伝子断片を接続したが、接続システムは、酵素消化・回收されたベクターそれぞれ200μg、cra4S1遺伝子断片280μg、T4 DNAリガーゼ1.0μl、10×Buffer緩衝液2.0μlであり、ddH2Oで20μlまで補足し、16℃で12~16 h反応させた。うまく接続された発現ベクターcra4S1-pET-30a(+)プラスミドを大腸菌に形質転換した。
IPTG誘導:実施例2の形質転換プレートにおける2つの単一コロニーを選択し、50μg/mlのカナマイシンを含む3mlのLB培養液の試験管内にそれぞれ接種し、37℃、200rpmで振とうして一晩放置し、翌日に1:100で50μg/mlのカナマイシンを含むLB培養液100mlに接種し、菌体OD600が0.6~0.8になるまで37℃、220rpmで振とうし(約4h)、培養物1mlを取り出し、10000gを室温で5 min遠心分離し、上清を捨て、PBS 100μlで菌体を再懸濁して沈殿させ、準備に備えた。最終濃度が1mMになるように残りの培養物にIPTGを加え、37℃、220rpmで4時間振とうして組み換えタンパク質の発現を誘導し、培養物1mlを取り出し、10000gを室温で5 min遠心分離し、上清を捨て、PBS 100μlで菌体を再懸濁して沈殿させ、準備に備えた。残りの培養物を遠心分離して沈殿させた後に上清を捨て、湿重量を計量し、記録してファイルに保存し、-20℃の冷蔵庫で保存した。
ポルフィロモナスジンジバリスの病原性を検出するために、マウスの表皮と皮下軟組織病変モデルを確立した。
本実施例の目的は、4つの主な外膜タンパク質に対応するポルフィロモナスジンジバリスの亜型、それらの毒力の違い及び細菌感染の用量と病変との相関関係を調査することである。
実験中に、ポルフィロモナスジンジバリスに感染したことのない25週齢以上のマウスは、異なる亜型のポルフィロモナスジンジバリスの攻撃に対して局所の微小病変のみが発生されたことが認められたが、本実施例の目的は年齢とポルフィロモナスジンジバリス感染との関係を調査することである。
実施例6の実験結果により、動物はポルフィロモナスジンジバリスに初感染すると自己治癒することがあり、年齢が小さいほど回復が早くなることが明らかになる。臨床診療では、歯周病は、断続的な進行をよく示している。本実施例の目的は、1回と複数回感染した実験動物モデルを比較することによって、複数回の慢性感染による実験動物への局所と全身の被害を調査することである。
本実施例は、混合ワクチンの免疫保護機能を発見する最初の試みである。最初に実験の目的は、ポルフィロモナスジンジバリスの異なる亜型の外膜タンパク質RagBの間に免疫交差保護作用があるか否かを調査することであるので、実験を設計する時、質量比1:1でW50ragBタンパク質(タンパク質配列の内容はPCT/GB2005/001976を参照し、タンパク質精製などのやり方は実施例3と同様である)及びQMLragBタンパク質(タンパク質配列の内容はPCT/GB2005/001976を参照し、タンパク質精製などのやり方は実施例3と同様である)を含むRagB 2価ワクチンを最初に使用した。2回免疫した後、Cra4S1タンパク質(実施例3で調製されたCra4S1タンパク質)をさらに加え、それぞれのタンパク質に3回の免疫の機会が与えられた。各亜型の共有する共通抗原Cra4S1を添加することは、新しい混合ワクチンがRagBワクチンの免疫保護効果に影響を与えることができるか否かを調査するためである。
臨床的に、歯周病/インプラント周囲炎の患者のほとんどは、不快な症状で医師の診察を受ける時、感染症や感染症による局所病変がすでに深刻になることがよくある。本実施例は、ポルフィロモナスジンジバリスに感染した体内での混合ワクチンの免疫保護作用を複数の観点から検討する。
この実験の目的は、受動免疫(即ち、特異抗体の注射)が安全的且つ効果的な免疫保護作用を果たすことができるか否かを調査することである。実際に、抗体は治療薬として、通常、すでに感染した患者を対象としているため、本実施例は感染していない動物と感染した動物の両方を同時に分析した。
Claims (3)
- SEQ ID NO.2に示されるアミノ酸配列からなるCra4S1タンパク質を含む、ワクチン又は医薬であって、ポルフィロモナスジンジバリスのW50ragBタンパク質、ThairagBタンパク質、QMLragBタンパク質及び381ragBタンパク質のうちの1種又は複数種をさらに含む、またはポルフィロモナスジンジバリスのW50ragBタンパク質、ThairagBタンパク質、QMLragBタンパク質及び381ragBタンパク質のうちの1種又は複数種と併用される、ワクチン又は医薬、ここで、前記ワクチン又は医薬は、未感染の健康な人の歯周病又はインプラント周囲炎又はポルフィロモナスジンジバリス感染症の発生の予防、若しくは歯周病又はインプラント周囲炎又はポルフィロモナスジンジバリス感染症関連疾患に罹患したことがある患者の再発の防止または治療に用いられ、前記歯周病又はインプラント周囲炎又はポルフィロモナスジンジバリス感染症又はポルフィロモナスジンジバリス感染症関連疾患が前記1種又は複数種のragBタンパク質のいずれかの由来と対応するポルフィロモナスジンジバリスの亜型によるものである。
- 前記ワクチン又は医薬におけるCra4S1タンパク質とW50ragBタンパク質との質量比は1:2~8、又は前記Cra4S1タンパク質とThairagBタンパク質との質量比は1:1~6、又は前記Cra4S1タンパク質とQMLragBタンパク質との質量比は1:1~6、又は前記Cra4S1タンパク質と381ragBタンパク質との質量比は1:2~9である、請求項1に記載のワクチン又は医薬。
- SEQ ID NO.2に示されるアミノ酸配列からなるCra4S1タンパク質に特異的な抗体を含む医薬であって、ポルフィロモナスジンジバリスのW50ragBタンパク質、ThairagBタンパク質、QMLragBタンパク質及び381ragBタンパク質のうちの1種又は複数種に特異的な抗体をさらに含む、またはポルフィロモナスジンジバリスのW50ragBタンパク質、ThairagBタンパク質、QMLragBタンパク質及び381ragBタンパク質のうちの1種又は複数種に特異的な抗体と併用される、医薬、ここで、前記医薬は、未感染の健康な人の歯周病又はインプラント周囲炎又はポルフィロモナスジンジバリス感染症の発生の予防、若しくは歯周病又はインプラント周囲炎又はポルフィロモナスジンジバリス感染症関連疾患に罹患したことがある患者の再発の防止または治療に用いられ、前記歯周病又はインプラント周囲炎又はポルフィロモナスジンジバリス感染症又はポルフィロモナスジンジバリス感染症関連疾患が前記1種又は複数種のragBタンパク質のいずれかの由来と対応するポルフィロモナスジンジバリスの亜型によるものである。
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WO2005112992A1 (en) | 2004-05-19 | 2005-12-01 | Queen Mary & Westfield College | P. gingivalis vaccine |
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FEMS Immunol. Med. Microbiol., 1993, 7(3): pp. 211-222 |
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