JP7325845B2 - 膵がん及び膵管内乳頭粘液性腫瘍のマーカー - Google Patents
膵がん及び膵管内乳頭粘液性腫瘍のマーカー Download PDFInfo
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- JP7325845B2 JP7325845B2 JP2021115619A JP2021115619A JP7325845B2 JP 7325845 B2 JP7325845 B2 JP 7325845B2 JP 2021115619 A JP2021115619 A JP 2021115619A JP 2021115619 A JP2021115619 A JP 2021115619A JP 7325845 B2 JP7325845 B2 JP 7325845B2
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Description
(2)配列番号1に記載のアミノ酸配列において1以上、5以下のアミノ酸の欠失、置換および/または付加を有するアミノ酸配列;
(3)配列番号1に記載のアミノ酸配列に対して95%以上の相同性を有するアミノ酸配列。
(5)配列番号2に記載のアミノ酸配列において1以上、25以下のアミノ酸の欠失、置換および/または付加を有するアミノ酸配列;
(6)配列番号2に記載のアミノ酸配列に対して95%以上の相同性を有するアミノ酸配列。
セクレトグロビン,ファミリー1D,メンバー2およびポドカリキシン様タンパク質からなる群より選択される1以上のタンパク質の試料中の濃度を測定する工程を含むことを特徴とする方法。
セクレトグロビン,ファミリー1D,メンバー2およびポドカリキシン様タンパク質からなる群より選択される1以上のタンパク質の試料中の濃度を測定する工程を含むことを特徴とする方法。
(2)配列番号1に記載のアミノ酸配列において1以上、5以下のアミノ酸の欠失、置換および/または付加を有するアミノ酸配列;
(3)配列番号1に記載のアミノ酸配列に対して95%以上の相同性を有するアミノ酸配列。
(5)配列番号2に記載のアミノ酸配列において1以上、25以下のアミノ酸の欠失、置換および/または付加を有するアミノ酸配列;
(6)配列番号2に記載のアミノ酸配列に対して95%以上の相同性を有するアミノ酸配列。
(2)配列番号1に記載のアミノ酸配列において1以上、5以下のアミノ酸の欠失、置換および/または付加を有するアミノ酸配列;
(3)配列番号1に記載のアミノ酸配列に対して95%以上の相同性を有するアミノ酸配列。
(5)配列番号2に記載のアミノ酸配列において1以上、25以下のアミノ酸の欠失、置換および/または付加を有するアミノ酸配列;
(6)配列番号2に記載のアミノ酸配列に対して95%以上の相同性を有するアミノ酸配列。
本発明に係る膵がん及びIPMNのマーカーは、セクレトグロビン,ファミリー1D,メンバー2(secretoglobin,family 1D,member 2,以下、「SCGB1D2」と略記する)およびポドカリキシン様タンパク質(podocalyxin-like protein,以下、「PODXL」と略記する)からなる群より選択される1以上のタンパク質である。当該タンパク質を検出対象とすることにより、高い感度と特異性をもって膵がんの進行やIPMNの有無を評価することができる。
本発明では、「膵管内乳頭粘液性腫瘍(IPMN)」も検出対象とする。IPMNは、膵管内乳頭腺腫ともいい、前がん病変であり、IPMNががん化した腫瘍は膵がんとは別のがんと定義されることもある。しかし、IPMNは放置しておくとがん化し、膵管外に浸潤した場合には5年後生存率は著しく低下することから、早期の発見と切除が必要である。一方、IPMNの検出は従来の膵がんマーカーであるCA19-9では非常に難しい。そこで本発明では、便宜上、IPMN、およびIPMNから進行した悪性腫瘍である膵管内乳頭腺がんも膵がんの定義に含め、検出対象とする。
アミノ酸配列(2): 配列番号1に記載のアミノ酸配列において1以上、5以下のアミノ酸の欠失、置換および/または付加を有し、且つ、膵がん患者およびIPMN患者の体液中に見出されるタンパク質のアミノ酸配列;
アミノ酸配列(3): 配列番号1に記載のアミノ酸配列に対して95%以上の相同性を有し、且つ、膵がん患者およびIPMN患者の体液中に見出されるタンパク質のアミノ酸配列;
アミノ酸配列(4): 配列番号2に記載のアミノ酸配列;
アミノ酸配列(5): 配列番号2に記載のアミノ酸配列において1以上、25以下のアミノ酸の欠失、置換および/または付加を有し、且つ、膵がん患者およびIPMN患者の体液中に見出されるタンパク質のアミノ酸配列;
アミノ酸配列(6): 配列番号2に記載のアミノ酸配列に対して95%以上の相同性を有し、且つ、膵がん患者およびIPMN患者の体液中に見出されるタンパク質のアミノ酸配列。
次に、上記膵がん及びIPMNのマーカーを検出対象とする膵がん及びIPMNの診断方法を、工程毎に説明する。なお、膵臓から転移した膵がん細胞は運動性や浸潤性に富み、かかる運動性や浸潤性に必須である葉状仮足を有し、SCGB1D2とPODXLを分泌すると考えられる。よって本発明に係る膵がんの診断方法は、膵がん細胞の転移を評価する方法としても有効である。例えば、膵がんを切除する外科的手術の後、既に転移している膵がん細胞を、たとえその組織が従来の膵がんマーカーでは検出できないほど小さなものであっても、本発明方法により検出できる可能性がある。
本工程では、被験者から試料を取得する。ここでの試料とは、血液、リンパ液、尿など被験者の体液に加えて、血清や血漿など、採取した体液を処理したものをいう。
本工程では、SCGB1D2およびPODXLからなる群より選択される1以上のタンパク質の試料中の濃度を測定する。
上記工程で得られた標的タンパク質量から、膵がん及びIPMNの有無を評価する。実際には、膵がん患者、IPMN患者および非膵がん患者、さらには様々な進行度の膵がん患者から試料を得、同一条件で試料に含まれるSCGB1D2および/またはPODXLの量を測定しておき、データを蓄積しておく。かかる蓄積データと測定結果を照らし合わせ、被験者における膵がん及びIPMNの有無、進行度、転移の有無などを判断する。
本発明に係る膵がん及びIPMNの診断キットは、SCGB1D2およびPODXLからなる群より選択される1以上のタンパク質に対する抗体を含む。当該キットは、ELISA法を用いた上記本発明方法で用いることができる。より詳しくは、例えば、抗SCGB1D2抗体および/または抗PODXL抗体を結合させたプレートに被験者から得た試料を添加し、洗浄することにより、試料中に含まれるSCGB1D2および/またはPODXLを特異的に結合させる。次いで、プレートに結合させたSCGB1D2および/またはPODXLを、標識基を結合させた二次抗体などで検出し、当該標識基に応じた発色の強度などでSCGB1D2および/またはPODXLの試料中の量を測定することができる。
本発明者は、膵がん細胞の浸潤・転移機構の解明を目的とした研究を行っており、インスリン様成長因子2MRNA結合タンパク質3(IGF2BP3)が、特定のmRNAと結合することにより、細胞膜突起である葉状仮足(lamellipodia)におけるそれらmRNAの局所翻訳に関与していることを明らかにした(Oncotarget,5,pp.6832-45(2014)にて報告済み)。これらのmRNAの中に、SCGB1D2およびPODXLのmRNAも含まれていた(未発表)。そこで、SCGB1D2とPODXLの機能解析を行った。
(1) 被験者の選定
高知大医学部付属病院消化器内科において診断された膵がん23症例(ステージI膵がん1例,ステージIII膵がん5例,ステージIV進行膵がん17例)と、良性腫瘍であるIPMN(膵管内乳頭粘液性腫瘍)症例11例を対象として実施した。IPMN症例は、がんの既往がなく手術の行われていない患者を対象とした。コントロールとしては、高知大医学部付属病院消化器内科に通院中の膵臓疾患のない慢性肝炎、大腸ポリープ、胃ポリープの計51症例とした。高知大学医学部治験審査委員会の承認を得た説明文書を用いて、本発明者とともに膵臓病診療を行っている日本消化器病学会指導医2名が説明を行い、患者本人から文書による同意を得てから症例登録を行った。各被験者から採血後、速やかに血清を分離し、0.2mLずつ1.5mL容器に分注し、専用の冷凍庫に-20℃で保存し、測定まで厳重に管理した。
市販のサンドイッチELISAキット(CUSABIO社製「SCGB1D2 ELISA kit,CSB-ELO20814HU」およびCLOUD-CLONE社製「ELISA kit for PODXL,SEA768Hu」)を用い、被験者血清におけるSCGB1D2とPODXLの濃度を測定した。
SCGB1D2の結果を図3に、PODXLの結果を図4に示す。膵がん被験者群血清におけるSCGB1D2濃度の中央値は238.872ng/mL(四分位範囲599.602)、コントロール被験者群血清の同値は71.091ng/mL(四分位範囲91.434)であり、また、膵がん被験者群血清におけるPODXL濃度の中央値は8.738ng/mL(四分位範囲6.284)、コントロール被験者群血清の同値は0.093ng/mL(四分位範囲0.705)であった。SCGB1D2とPODXLそれぞれの濃度について、膵がん被験者群とコントロール被験者群との間でマン・ホイットニU検定を行ったところ、共にP<0.001で有意差が認められた。
Claims (6)
- ポドカリキシン様タンパク質に対する抗体を含む、血液試料を用いて膵がん及び膵管内乳頭粘液性腫瘍を診断するためのキット。
- さらに、CA19-9に対する抗体を含む、請求項1記載のキット。
- 血液試料が血清試料である、請求項1又は2記載のキット。
- 膵がん及び膵管内乳頭粘液性腫瘍を評価することを補助するための方法であって、
ポドカリキシン様タンパク質の血液試料中の濃度を測定する工程を含み、
非膵がん患者の血液試料中の濃度と比較して、測定したポドカリキシン様タンパク質の濃度が高いことが、膵がん又は膵管内乳頭粘液性腫瘍を有することを示す、
前記方法。 - さらに、CA19-9の血液試料中の濃度を測定する工程を含み、
非膵がん患者の血液試料中の濃度と比較して、測定したCA19-9の濃度が高いことが、膵がん又は膵管内乳頭粘液性腫瘍を有することを示す、
請求項4記載の方法。 - 血液試料が血清試料である、請求項4又は5記載の方法。
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