Thesis
Initial Investigation of Immune Function in Host and Parasite During The Reproduction Cycle of a Parasitic Barnacle
Rhizocephala members have the ability to manipulate its decapod hosts’ behavior, anatomy,
and physiology. The immune system of Rhizocephala and the effect of Rhizocephala infections on
immunity of parasitized crabs have not been discussed. This study describes the expressions of
several immune-related genes in Polyascus planus (parasitic barnacle)-parasitized Metopograpsus
thukuhar and in the reproductive organ of P. planus (externa) through quantitative real-time PCR.
Upon the infection of P. planus, transglutaminase was found to be significantly downregulated in the
host. Meanwhile, the anti-lipopolysaccharide factor of the host was upregulated upon the infection.
On the other hand, several immune-related genes such as C-type lectin, crustin, glutathione
peroxidase, superoxide dismutase, and serine protease inhibitors were found to be expressed in the
externa of P. planus. As the externa reached the maturation stage and completion of the life cycle,
the expressions of those immune-related genes were significantly increased. This study serves as an
initial investigation of immune function in P. planus and P. planus-parasitized M. thukuhar.
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