Hematopoiesis, Kazal Inhibitors and Crustins in a Crustacean

Hemocytes are needed as storage and manufacturers of proteins of the innate immune defence, along with actors of the cellular immune response. So that the hematopoietic process is essential for survival of many invertebrates. In an effort to try to find molecules worth focusing on for hemocytes increase in crayfish we investigated proteins in crayfish plasma, who were enhanced after microbial challenge. Consequently we were capable to identify, cleanse and define a fresh invertebrate cytokine named astakine, and can show that it protein is essential for hematopoietic increase in vivo and also in an in vitro cell culture program. Astakine posesses a prokineticin (PK) domain shown as a beginner in an invertebrate, however, not like the vertebrate PKs, astakine binds to a cell surface F1 ATP synthase ß subunit situated on the hematopoietic tissue (hpt) cell membranes. Extracellular ATP synthases as receptors have earlier been reported in various vertebrate cells and here we reveal that extracellular ATP synthase ß subunit acts as a receptor for an invertebrate cytokine which is included in hematopoiesis.We also observed two other categories of proteins, who were increased in plasma after microbial challenge and they were further characterized.

Contents: Hematopoiesis, Kazal Inhibitors and Crustins in a Crustacean

Introduction
Immune response of crayfish and other arthropods
Proteinase inhibitors
Antimicrobial peptides (AMPs)
Hematopoiesis
Cytokines in invertebrates
Prokineticin (PK) domain proteins and receptors (PKR)
Objectives
Results and Discussion
An ancient role for a prokineticin domain in invertebrate hematopoiesis (Paper I)
The E subunit of ATP synthase is a receptor for the invertebrate
prokineticin protein, astakine (Paper II)
Kazal proteinase inhibitors from the crayfish, Pacifastacus leniusculus (Paper III)
Antibacterial peptides in hemocytes and hematopoietic tissue from
freshwater crayfish Pacifastacus leniusculus; characterization and
expression pattern (Paper IV)…