Abstract:
:Siglec-3/CD33 is a myeloid-specific inhibitory receptor that is expressed on cells of the immune system, where it is believed to play a regulatory role, modulating the inflammatory and immune responses. We characterized CD33 (RbCD33) in rock bream which is a transmembrane protein with two IG-like domains and a cytoplasmic tail. It has a deduced amino acid sequence of 390 residues and has tyrosine-based signaling motifs in the cytoplasmic tail. The RbCD33 mRNA was highly expressed in peripheral blood leukocytes and was also detected in the muscle, spleen, skin, head kidney, gills, trunk kidney, heart, stomach, brain, intestine and liver by quantitative real-time PCR. A temporal variation in expression of RbCD33 was observed in different tissues after stimulating with E. tarda, S. iniae and red seabream iridovirus (RSIV). In the head kidney tissue, E. tarda and S. iniae induced RbCD33, while a down regulation was observed with RSIV. In addition, in spleen tissue, S. iniae caused a very high induction of RbCD33 in comparison with an E. tarda and RSIV challenge. In the liver and gill tissues, all three pathogens induced a high expression of RbCD33. The expression pattern in various tissues and its high induction after pathogen stimulation suggests that RbCD33 plays an important role in initiating the immune response via the inhibition of signal transduction of the myeloid lineage cells.
journal_name
Dev Comp Immunoljournal_title
Developmental and comparative immunologyauthors
Jeswin J,Joo MS,Jeong JM,Bae JS,Choi KM,Cho DH,Park SI,Park CIdoi
10.1016/j.dci.2018.02.005subject
Has Abstractpub_date
2018-07-01 00:00:00pages
117-122eissn
0145-305Xissn
1879-0089pii
S0145-305X(17)30607-9journal_volume
84pub_type
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