申请人:Rivier E. F. Jean
公开号:US20050245438A1
公开(公告)日:2005-11-03
Analogs of SRIF which are selective for SSTR4 in contrast to the other cloned SRIF receptors are useful in determining tissue and cellular expression of the receptor SSTR4 and its biological role in regulating tumor growth. SRIF analog peptides, such as des-AA
1,2,4,5,12,13
[Ala
7
]-SRIF; des-AA
1,2,4,5,12,13
[Aph
7
]-SRIF, des-AA
1,2,4,5,12,13
[Aph
7
]Cbm-SRIF; des-AA
1,2,4,5,12,13
[Tyr
2
,Ala
7
]-Cbm-SRIF, and des-AA
1,2,4,5,12,13
[Tyr
7
,C
β
Me-L-2Nal
8
]-SRIF, and counterparts incorporating D-Cys
3
and/or D-Trp
8
and/or Ala
11
, bind with high affinity to the cloned human receptor SSTR4 and activate the receptor, but they do not bind with significant affinity to human SSTR1, SSTR2, SSTR3 or SSTR5. By incorporating an iodinated tyrosine in position-2 in these SSTR4-selective SRIF analogs, a labeled compound useful in drug-screening methods is provided. Alternatively, for use in therapy, cytotoxins or highly radioactive elements can be N-terminally coupled or complexed thereto.
SRIF的类似物,其选择性针对SSTR4而不是其他克隆的SRIF受体,对于确定受体SSTR4在组织和细胞表达以及其在调节肿瘤生长中的生物学作用非常有用。SRIF类似物肽,例如des-AA1,2,4,5,12,13[Ala7]-SRIF;des-AA1,2,4,5,12,13[Aph7]-SRIF;des-AA1,2,4,5,12,13[Aph7]Cbm-SRIF;des-AA1,2,4,5,12,13[Tyr2,Ala7]-Cbm-SRIF和des-AA1,2,4,5,12,13[Tyr7,CβMe-L-2Nal8]-SRIF以及包含D-Cys3和/或D-Trp8和/或Ala11的对应物,与克隆的人类受体SSTR4具有高亲和力并激活受体,但它们不与人类SSTR1、SSTR2、SSTR3或SSTR5结合。通过在这些SSTR4选择性SRIF类似物中将碘化酪氨酸置于位置2,提供了一种在药物筛选方法中有用的标记化合物。或者,用于治疗的话,可以将细胞毒素或高放射性元素与其N-端耦合或配合。