Immunostimulation by a partially modified retro-inverso-tuftsin analog containing Thr1.sum..psi.[NHCO](R,S)Lys2 modification
| Autor: | M. G. Longobardi, G. C. Viscomi, Mauro Perretti, S. Peppoloni, A. S. Verdini, S. Silvestri, M. Pinori, C. Becherucci, Luca Parente, P. Pileri |
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| Rok vydání: | 1991 |
| Předmět: |
Male
Erythrocytes Stereochemistry Molecular Sequence Data Tuftsin Peptide Mice chemistry.chemical_compound Adjuvants Immunologic Drug Stability In vivo Drug Discovery Animals Humans Amino Acid Sequence Peptide sequence chemistry.chemical_classification Mice Inbred BALB C Mice Inbred C3H Sheep Tetrapeptide Proteolytic enzymes Biological activity Arthritis Experimental In vitro Rats Killer Cells Natural chemistry Biochemistry Rats Inbred Lew Antibody Formation Molecular Medicine Female Peptide Hydrolases |
| Zdroj: | Journal of Medicinal Chemistry. 34:3372-3379 |
| ISSN: | 1520-4804 0022-2623 |
| Popis: | The tuftsin retro-inverso analogue H-Thr psi[NHCO](R,S)Lys-Pro-Arg-OH was synthesized through a novel procedure for the high-yield incorporation of isolated retro-inverso bonds into peptide chains and the use of the new Meldrum's acid derivative (CH3)2C(OCO)2CH(CH2)4NHCOCF3 followed by its efficient coupling in solution to trimethylsilylated H-D-Thr(t-Bu)NH2. Closely related peptide impurities were eliminated both from the crude final peptide and the fully protected tetrapeptide amide precursor via ion-exchange and reversed-phase displacement chromatography, respectively. The tuftsin retro-inverso analogue proved to be completely resistant to enzymatic degradation in vitro, either against isolated aminopeptidases or human plasma proteolytic enzymes. When administered either orally or intravenously, it was significantly more active than normal tuftsin in increasing the number of specific antibody secreting cells in spleen of mice immunized with sheep erythrocytes. Furthermore, the analogue exerted an enhanced stimulatory effect on the cytotoxic activity of splenocytes against YAC-1 tumor cells. Finally, retro-inverso-tuftsin was about 10-fold more potent than the native peptide in reducing rat adjuvant arthritis. The resistance of the retro-inverso analogue to peptidases might explain the increased in vivo activities and allows its further immunopharmacological characterization. |
| Databáze: | OpenAIRE |
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