BT was ASM’s co-supervisor. She contributed to the interpretation of experimental results and the theory development. She also revised the manuscript. All authors read and approved the final manuscript.”
“Background selleck The coelomic fluid, haemolymph and blood in some phyla (Nemertea, Annelida) of invertebrates play a crucial role in physiological processes, viz., transportation of nutrients, metabolic intermediates and end products, respiratory gases and signalling molecules.
These body fluids have a defined composition, containing characteristic cell types which take part in blood coagulation, wound healing and immune response. The cells of invertebrate body fluids are analogous in function with vertebrate blood cells. Therefore, we need to understand the influence of nanoparticles (NPs) and their cytotoxicity and genotoxicity. In this context, some earlier studies suggested the contribution of coelomocytes to homeostatic regulation, e.g. in blood coagulation immune reactions and in regeneration of lost body parts. Annelids are the first animals in the phylogenetic tree in which not only the cellular but also the humoral immune response is developed. During
the cellular immune response, coelomocytes play a role in phagocytosis, inflammatory processes, graft rejection and coagulation of coelomic fluid. During the humoral immune response, they secrete lysozyme, agglutinin, peroxidase, Akt assay phenoloxidases and antimicrobial factors (fetidin, lysenin, eiseniapore, coelomic cytolytic factor). Cytotoxic molecules may increase the intracellular calcium concentration in target cells, which participate in exocytosis, enzyme function, regulation of gene expression, cell proliferation and apoptosis; therefore, chloragocytes can induce and influence important physiological processes by these signal molecules . Thus, they play a remarkable role in the function of the earthworm immune system and are LY3039478 chemical structure involved in phagocytosis
and the release of lytic factors which are characteristics of Amobarbital innate immunity . Earthworms have pores that connect the coelomic cavity to the exterior, through which cells are extruded following stress. These cells are considered as immune cells (type of leucocytes) that have long been considered to constitute the major innate immune defense system of annelids [3, 4]. Coelomocytes from various sources have shown to be capable of phagocytosis and thus perform functions of macrophages. These have natural killer cell features, mediate lytic reactions against several targets and also secrete antimicrobial peptides [5–9]. Valembois et al.  classified coelomocytes into three major categories: acidophils, basophils and chloragocytes (chloragogen cells or eleocytes). These cells contain characteristic granules called chloragosomes which are thought to be involved in the protection of cells and organisms against foreign substances [11, 12].