Abstract
Phenoloxidases, the enzymes involved in the production of melanin pigments, are widespread among microorganisms, plants, and animals. In arthropods, melanin is formed during hardening and darkening of the cuticle and in response to cuticular wounding and to invasion of foreign matter into the hemocoel. Recent studies on crustacean and insect systems have demonstrated that phenoloxidases occur as inactive precursors, termed the prophenoloxidases. Prophenoloxidases are activated by a proteolytic cascade system referred to as the proPO system. Activation of the cascade produces melanin and stimulates cellular defense activities including hemocyte attachment, spreading and degranulation, phagocytosis, nodule formation and encapsulation, and hemocyte locomotion. The cascade is activated by microbial cell wall components such as bacterial LPS and peptidoglycans as well as the fungal β-1,3-glucans (Chapters 5, 8).
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Boucias, D.G., Pendland, J.C. (1998). Insect Immune Defense System, Part III: Prophenoloxidase Cascade and Post-Attachment Processes of Phagocytosis. In: Principles of Insect Pathology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-4915-4_15
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