Antiviral and Antitumor Peptides from Insects

• Published in: Proceedings of the National Academy of Sciences - PNAS 2002-10, Vol.99 (20), p.12628-12632
• Main Authors: Chernysh, Sergey, Kim, S. I., Bekker, G., Pleskach, V. A., Filatova, N. A., Anikin, V. B., Platonov, V. G., Bulet, Philippe
• Format: Article
• Language: English
• Subjects: Amino Acid Sequence; Amino acids; Animals; Antineoplastic Agents - chemistry; Antineoplastic Agents - pharmacology; Antiviral Agents - chemistry; Antiviral Agents - pharmacology; Antivirals; Biological Sciences; Biology; Blood; Cells, Cultured; Cytokines; Cytotoxicity; Diptera - metabolism; Dose-Response Relationship, Drug; Hemolymph - metabolism; Humans; Insect Proteins - chemistry; Insect Proteins - pharmacology; Insects; Interferons - chemistry; Interferons - metabolism; Killer Cells, Natural; Life Sciences; Lymphocytes; Mice; Molecular Sequence Data; Molecules; Orthomyxoviridae; Peptides; Peptides - chemistry; Peptides - pharmacology; Prions; Sequence Homology, Amino Acid; Time Factors; Tumor Cells, Cultured; Tumors; Viruses
• ISSN: 0027-8424; 1091-6490
• DOI: 10.1073/pnas.192301899

Insects can rapidly clear microbial infections by producing a variety of immune-induced molecules including antibacterial and/or anti-fungal peptides/polypeptides. In this report, we present the isolation, structural characterization, and biological properties of two variants of a group of bioactive, slightly cationic peptides, referred to as alloferons. Two peptides were isolated from the blood of an experimentally infected insect, the blow fly Calliphora vicina (Diptera), with the following amino acid sequences: HGVSGHGQHGVHG (alloferon 1) and GVSGHGQHGVHG (alloferon 2). Although these peptides have no clear homologies with known immune response modifiers, protein database searches established some structural similarities with proteins containing amino acid stretches similar to alloferon. In vitro experiments reveal that the synthetic version of alloferon has stimulatory activities on natural killer lymphocytes, whereas in vivo trials indicate induction of IFN production in mice after treatments with synthetic alloferon. Additional in vivo experiments in mice indicate that alloferon has antiviral and antitumoral capabilities. Taken together, these results suggest that this peptide, which has immunomodulatory properties, may have therapeutic capacities. The fact that insects may produce cytokine-like materials modulating basic mechanisms for human immunity suggests a source of anti-infection and antitumoral biopharmaceuticals.