申请人:——
公开号:US20020173618A1
公开(公告)日:2002-11-21
Analogs of SRIF which are selective for SSTR1 in contrast to the other cloned SRIF receptors. These analogs are useful in determining the tissue and cellular expression of the receptor SSTR1 and its biological role in the endocrine, exocrine and nervous system, as well as in regulating tumor growth. SRIF analog peptides, such as des-AA
1,2,5
[D-Trp
8
, NMeIAmp
9
, Tyr
11
]-SRIF and counterparts incorporating Cbm at the N-terminus and/or N
&agr;
Ser
13
, inhibit the binding of a universal SRIF radioligand to the cloned human receptor SSTR1, but they do not bind with significant affinity to human SSTR2, SSTR3, SSTR4 or SSTR5. By incorporating an iodinated tyrosine in position-2 or in position-11 in these SSTR1-selective SRIF analogs, a labeled compound useful in drug-screening methods is provided. The N-terminus accommodates bulky moieties without loss of selectivity, and a carbamoyl moiety or a conjugating agent that will accept a radioactive nuclide or will link to a cytotoxin may be present at the N-terminus.
与其他克隆的 SRIF 受体相比,SRIF 的类似物对 SSTR1 具有选择性。这些类似物有助于确定 SSTR1 受体在组织和细胞中的表达,及其在内分泌、外分泌和神经系统中的生物学作用,以及在调节肿瘤生长方面的作用。SRIF 类似肽,如 des-AA
1,2,5
[D-Trp
8
、NMeIAmp
9
Tyr
11
]-SRIF 以及在 N 端含有 Cbm 和/或 N
&agr;
Ser
13
抑制通用 SRIF 放射性配体与克隆人受体 SSTR1 的结合,但它们与人 SSTR2、SSTR3、SSTR4 或 SSTR5 的结合亲和力不强。通过在这些 SSTR1 选择性 SRIF 类似物的第 2 位或第 11 位加入一个碘化酪氨酸,提供了一种可用于药物筛选方法的标记化合物。N 端可容纳体积较大的分子而不会丧失选择性,N 端还可含有氨基甲酰基或可接受放射性核素或与细胞毒素连接的连接剂。