HER2 binding polypeptides comprising the amino acid sequence EX
1
RNAYWEIA LLPNLTNQQK RAFIRKLYDD PSQSSELLX
2
E AKKLNDSQ wherein X
1
in position 2 is M, I or L, and X
2
in position 39 is S or C (SEQ ID NO:1) are disclosed. Moreover, such peptides comprising a chelating environment are disclosed. Also radiolabeled polypeptides formed by the peptides comprising a chelating environment and radionuclides are disclosed. Furthermore, methods of in vivo imaging of the body of a mammalian subject having or suspected of having a cancer characterized by overexpression of HER2 comprising administration of such a radiolabeled polypeptide followed by obtainment of an image of the body using a medical imaging instrument and also methods of treating such cancer are disclosed. Furthermore, the use of such a radiolabeled polypeptide in diagnosis and treatment of cancer characterized by overexpression of HER2. Nucleic acids encoding the polypeptides, expression vectors comprising the nucleic acids and host cells comprising the expression vectors are also disclosed.
本文披露了具有
氨基酸序列EX1RNAYWEIA LL
PNLTNQQK RAFIRKLYDD PSQS
SELLX2E AKKLNDSQ(
SEQ ID NO:1)的HER2结合
多肽。其中,位置2的X1为M、I或L,位置39的X2为S或C。此外,本文还披露了包含螯合环境的这种
多肽。同时,本文还披露了由包含螯合环境和放射性核素的
多肽形成的放射性标记的
多肽。此外,本文还披露了一种通过给予这种放射性标记的
多肽并使用医学成像仪器获得身体图像的方法,用于体内成像具有HER2过度表达的哺乳动物主体的身体,以及治疗这种癌症的方法。此外,本文还披露了使用这种放射性标记的
多肽在诊断和治疗HER2过度表达的癌症中的应用。本文还披露了编码
多肽的核酸、包含核酸的表达载体和包含表达载体的宿主细胞。