| abstract |
Substantially pure, physiologically active peptides are disclosed, comprising an amino acid sequence selected from Gly-Glu, Pro-Val-Val, Glu-Pro-Val-Val, Glu-Glu-Pro-Val-Val, Ala-Glu-Glu-Pro-Val-Val and Gly-Ala-Glu-Glu-Pro-Val-Val. These peptides have immunoregulatory activities, inhibiting the multiplication of Toxoplasma gondii inside cells, showing moreover antibacterial activity, antiviral activity and antitumor activity. A composition comprising at least two peptides selected from the above peptides or comprising at least one peptide selected from the above peptides and at least one additional petide comprising an amino acid sequence selected from Gly-Glu-Glu-Glu-Glu-Glu, Glu-Glu-Glu-Glu-Glu, Asp-Asp-Asp-Asp-Asp and Ala-Glu-Glu-Glu-Glu-Glu is especially useful as an active component for antiprotozoan, antibacterial, antiviral or antitumor agent. |