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Crustacean Haemocytes and Their Function in Immune Responses
Ist Teil von
Dōngwùxué yánjiū, 2007-04, Vol.27 (5)
Ort / Verlag
China: Kunming Institute of Zoology, Chinese Academy of Sciences
Erscheinungsjahr
2007
Quelle
EZB-FREE-00999 freely available EZB journals
Beschreibungen/Notizen
Crustaceans have been shown to possess a primitive immune system that
relies mainly on phagocytosis, encapsulation and agglutination.
Haemocytes play important roles in crustacean immune responses. It is
generally agreed that haematopoietic tissue (HPT) and haematopoietic
stem cells are responsible for the production and supply of haemocytes.
Most crustacean mature haemocytes were classified into three types by
using light microscopy in the past few years. Recently, the monoclonal
antibody technique has been used in identifying the types of some
crustacean haemocytes, which was proved to be more accurate than
classical methods. The cytochemical characteristics and function of
different haemocyte subpopulations show significantly difference,
suggesting a role for these cells in particular functions. It is
demonstrated that total haemocyte counts (THC) changed obviously in
crustacean immune response. Generally, the haemocytes defense action in
crustaceans relies mainly on phagocytosis when the pathogen is very
small, and the microorganism was killed in haemocytes. When a
microorganism or parasite is bigger than 10 μm, encapsulation and
agglutination played a more important role. Moreover, the immune
response of crustacean is very complex, during which cell co-operation
and communication, and immune factors interaction are necessary. The
study on the structure of HPT and the production mechanism of
haemocytes, the establishment of classification standard of haemocyte
subpopulations, the function and interaction of immune factors should
be the main focus in the future.