title: Polytuftsin: a potential precursor for slow release of the phagocytosis stimulating peptide tuftsin.
abstract: 1. Polytuftsin (Thr-Lys-Pro-Arg)n, was synthesized through polycondensation of an amino-free and carboxyl-activated derivative of tuftsin, H2N-Thr-Lys(Z)-Pro-Arg(Tos)-OSu, following suitable deprotection and fractionation steps. 2. Digestion of polytuftsin by trypsin, as well as by normal human serum, at 37 degrees C, yielded free tuftsin. 3. Polytuftsin affected the decreased formation of lung-metastasis, in B16 melanoma treated mice and prolonged the survival of animals more efficiently than tuftsin. 4. Tuftsin was found to be totally degraded by serum enzymes within approximately 60 min at 37 degrees C.
authors.affiliation: Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel.
authors.forename: R
authors.initials: R
authors.lastname: Surkis
authors.forename: S
authors.initials: S
authors.lastname: Rubinraut
authors.forename: S
authors.initials: S
authors.lastname: Dagan
authors.forename: E
authors.initials: E
authors.lastname: Tzehoval
authors.forename: M
authors.initials: M
authors.lastname: Fridkin
authors.forename: R
authors.initials: R
authors.lastname: Ben Yoseph
authors.forename: R
authors.initials: R
authors.lastname: Catane
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis; D006801:Humans; D008546:Melanoma, Experimental / Q000188:drug therapy; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009368:Neoplasm Transplantation; D011108:Polymers / Q000138:chemical synthesis* / Q000378:metabolism / Q000494:pharmacology; D011355:Prodrugs / Q000138:chemical synthesis* / Q000378:metabolism; D014357:Trypsin; D014405:Tuftsin / Q000097:blood / Q000138:chemical synthesis* / Q000378:metabolism* / Q000494:pharmacology
chemical_list: D000970:Antineoplastic Agents; D011108:Polymers; D011355:Prodrugs; C053968:polytuftsin; D014357:Trypsin; D014405:Tuftsin