摘要:
A method for radiolabelling peptides using polyaminocarboxylate ligands having suitable protecting groups such that they can be added to peptides by standard solid phase or solution phase peptide synthetic chemistry and can be deproteced using standard cleavage/deprotection reagents and produce the peptide/chelate conjugate as a high purity monoaddition product is provided. The cleaved and deprotected ligand-peptide molecules can then be labeled with lanthanide or actinide radionuclides. The protected polyaminocarboxylate ligands form mono-anhydrides or mono-active esters under solid phase or solution phase conditions and permit only the desired monoaddition chelate-peptide conjugate to be formed.
摘要:
Compositions and methods of incorporating ligand precursors and ligands at any location within a peptide during peptide synthesis are disclosed. Derivatives of 2,4,5-triaminopentanoic acid and .gamma.-aminoglutamic acid are selectively incorporated into the peptide during solid phase or liquid phase synthesis, depending upon the choice of protecting groups. Ligand synthesis may then be completed at a later time to produce N.sub.3 S, N.sub.2 S.sub.2, and EDTA type chelating agents.
摘要翻译:公开了在肽合成期间将配体前体和配体掺入肽内的任何位置的组合物和方法。 取决于保护基团的选择,2,4,5-三氨基戊酸和γ-氨基谷氨酸的衍生物在固相或液相合成期间选择性地掺入肽中。 随后可以在稍后完成配体合成以产生N 3 S,N 2 S 2和EDTA型螯合剂。
摘要:
A method for radiolabelling peptides using polyaminocarboxylate ligands having suitable protecting groups such that they can be added to peptides by standard solid phase or solution phase peptide synthetic chemistry and can be deproteced using standard cleavage/deprotection reagents and produce the peptide/chelate conjugate as a high purity mono-addition product is provided. The cleaved and deprotected ligand-peptide molecules can then be labeled with lanthanide or actinide radionuclides. The protected polyaminocarboxylate ligands form mono-anhydrides or mono-active esters under solid phase or solution phase conditions and permit only the desired monoaddition chelate-peptide conjugate to be formed.
摘要:
The present invention provides cleavable conjugates whose linkers contain a labile bond that is cleavable under a variety of mild conditions, including weakly acidic. Since the agent may be bonded directly to the linker, cleavage can result in release of native agent. The invention also provides methods for producing cleavable conjugates. Preferred agents include drugs, toxins, biological response modifiers, radiodiagnostic compounds, radiotherapeutic compounds, and derivatives thereof. The targeting molecule employed in the invention may be an intact molecule, a fragment thereof, or a functional equivalent thereof. In a particularly preferred embodiment, the targeting molecule is a monoclonal antibody directed towards a tumor-associated antigen in man. The invention further provides methods for delivering to the cytoplasm of a target cell an agent free of its targeting molecule carrier. A diagnostically/therapeutically effective dose of a cleavable conjugate is administered to a warm-blooded animal such as man.
摘要:
Ligands that are capable of forming metal complexes are incorporated directly into peptides at nonbiologically active locations. The metal complex serves as a bifunctional agent and as a spacer molecule. In one aspect of the invention, the ligands are prepared by replacing a nonbiologically active peptide spacer sequence with either Cys-Gly-Gly-Glu(.gamma.-)CO- (SEQ ID NO:1) or Cys-Gly-Gly-Lys(.epsilon.-)NH-CO(CH.sub.2).sub.2 -CO- (SEQ ID NO:2). In these examples, unnatural peptide bonds are used to attach the ligand to the terminal end of the peptide. Peptides incorporating such ligands are also disclosed.Other spacer ligands which may be incorporated into peptides include the following natural peptide sequences: -Cys-Gly-His-, -Asp-Gly-Cys-, -Glu-Gly-Cys-, -Gly-Asp-Cys-, and -Gly-Glu-Cys-. Unnatural tripeptides which function as spacer ligands include: -Cys-Gly-(imidazolyl glycyl)-, -isoCys-Gly-(imidazolyl glycyl)-, and -isoCys-Gly-His-. When the above peptide sequences are present in a nonbiologically active peptide spacer, they are able to form metal complexes with desired metal ions, and the resulting complexes serve as bifunctional agents and as spacer molecules in the peptide.
摘要翻译:能够形成金属络合物的配体在非生物活性位置直接并入肽中。 金属络合物用作双官能剂和间隔分子。 在本发明的一个方面,通过用Cys-Gly-Gly-Glu(γ - )CO-(SEQ ID NO:1)或Cys-Gly-Gly-Lys(SEQ ID NO:1)替代非生物活性肽间隔序列 ε-)NH-CO(CH 2)2 -CO-(SEQ ID NO:2)。 在这些实施例中,使用非天然肽键将配体连接到肽的末端。 还公开了掺入这种配体的肽。 可以并入肽中的其它间隔配体包括以下天然肽序列:-Cys-Gly-His-,-Asp-Gly-Cys-,-Glu-Gly-Cys-,-Gly-Asp-Cys-和 - Gly-Glu-Cys-。 用作间隔基配体的非天然三肽包括:-Cys-Gly-(咪唑基甘氨酰基) - , - iSysys-Gly-(咪唑基甘氨酰基) - 和-i-Syysys-Gly-His-。 当上述肽序列存在于非生物活性肽间隔物中时,它们能够与期望的金属离子形成金属络合物,并且所得复合物用作双功能试剂和肽中的间隔分子。
摘要:
Protein conjugated chelated metal radionuclides are provided for use in vivo. Intermediates are provided for preparing the polypeptide compositions efficiently.
摘要:
Chelating compounds of specified N.sub.2 S.sub.2 N.sub.3 S derived structure are useful for radiolabeling targeting molecules such as antibodies. Cleavable ester orthioester linkers connect the radionuclide metal chelates to the antibodies. The radiolabeled antibodies have improved biodistribution properties, including reduced localization within the intestines and kidneys.
摘要:
The present invention provides cleavable conjugates whose linkers contain a labile bond that is cleavable under a variety of mild conditions, including weakly acidic. Since the agent may be bonded directly to the linker, cleavage can result in release of native agent. The invention also provides methods for producing cleavable conjugates. Preferred agents include drugs, toxins, biological response modifiers, radiodiagnostic compounds, radiotherapeutic compounds, and derivatives thereof. The targeting molecule employed in the invention may be an intact molecule, a fragment thereof, or a functional equivalent thereof. In a particularly preferred embodiment, the targeting molecule is a monoclonal antibody directed towards a tumor-associated antigen in man. The invention further provides methods for delivering to the cytoplasm of a target cell an agent free of its targeting molecule carrier. A diagnostically/therapeutically effective dose of a cleavable conjugate is administered to a warm-blooded animal such as man.Another aspect of the invention provides methods for isolating a compound. The compound binds covalently to a solid phase which has been derivatized with the linkers described above and is released in native form by a variety of mild conditions.An additional aspect of the invention provides methods for introducing into a compound a free sulfhydryl, amino, or hydroxyl group by use of reagents structurally related to the linkers described above. Preferred uses of the method are to add a free amino or a free sulfhydryl group to a protein, such as an antibody, or a drug.
摘要:
Peptide analogs of neurotensin are disclosed which are resistant to enzymatic degradation and which retain high binding affinity for neurotensin receptors. Pharmaceutical compositions of these compounds are useful for diagnostic and therapeutic purposes.
摘要:
The present invention relates particularly to novel imidazole based nitrogen-sulfur ligands that are suitable for complexing with a radionuclide, and are useful as general imaging agents for diagnostic purposes.