Design of the Synthetic Route for Peptides and Proteins Based on the Solubility Prediction Method. I. Synthesis and Solubility Properties of Human Proinsulin C-Peptide Fragments
Design of the Synthetic Route for Peptides and Proteins Based on the Solubility Prediction Method. I. Synthesis and Solubility Properties of Human Proinsulin C-Peptide Fragments
Studies of the synthesis, immunology, and cytotoxicity of a cyclic octapeptide corresponding to TNF-.alpha.-(59-66)
作者:Leung Sheh、Hsou Hung Lin、Kee Ching G. Jeng、Chia Fu Chen
DOI:10.1021/jm00078a020
日期:1993.12
In an attempt to investigate possible binding domains of the tumor necrosis factors (TNF), we have previously synthesized a cyclic hexapeptide corresponding to murine TNF-(127-132) (cTNF-1).(3) In this report, we describe the synthesis and biological activity of another cyclic octapeptide corresponding to human TNF-alpha-(59-66) (cTNF-2). The design of these cyclic peptides is based on their high sequence homology with corresponding fragments of human TNF-alpha or TNF-beta. Similar to cTNF-1,(3) the cyclic octapeptide cTNF-2 displayed low in vitro cytotoxicity against human HeLa and HEP-2 cell lines. The cyclic peptides cTNF-2 and cTNF-1 were then tested for the induction of interleukin-l (IL-1) production from human peripheral blood mononuclear cells and monocytes in vitro. At low concentrations, the IL-1 levels induced by these cyclic peptides were similar to that of recombinant TNF-alpha. However, the IL-1 production by cTNF-2 stimulation was dose-dependently increased and reached that of a lipopolysaccharide (LPS; 0.1 mu g/mL) level. These findings suggest that the fragments corresponding to human TNF-alpha-(59-66) and murine TNF-(127-132) may represent certain binding domains of the tumor necrosis factors that elicit IL-1 production.