Abstract：
:The monogenean ectoparasite, Dactylogyrus sp. is a major pathogen in freshwater aquaculture. The immune responses in parasitized fish were analyzed by quantitation of innate immune factors (natural agglutinin level, haemolysin titre, antiprotease, lysozyme and myeloperoxidase activities) in serum and immune-relevant gene expression in gill and anterior kidney. The antiprotease activity and natural agglutinin level were found to be significantly higher and lysozyme activity was significantly lower in parasitized fish. Most of the genes viz., beta2-microglobulin (beta2M), major histocompatibility complex I (MHCI), MHCII, tumor necrosis factor alpha (TNFalpha) and toll-like receptor 22 (TLR22) in gill samples were significantly down-regulated in the experimental group. In the anterior kidney, the expression of superoxide dismutase and interleukin 1beta (IL1beta) were significantly up-regulated whereas a significant down regulation of MHCII and TNFalpha was also observed. The down-regulation of most of the genes viz, MHCI, beta2M, MHCII, TLR22 and TNFalpha in infected gills indicated a well evolved mechanism in this parasite to escape the host immune response. The modulation of innate and adaptive immunity by this parasite can be further explored to understand host susceptibility.
journal_name
Indian J Exp Bioljournal_title
Indian journal of experimental biologyauthors
Dash P,Kar B,Mishra A,Sahoo PKsubject
Has Abstractpub_date
2014-03-01 00:00:00pages
267-80issue
3eissn
0019-5189issn
0975-1009journal_volume
52pub_type
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journal_title：Indian journal of experimental biology
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