Journal
FISH & SHELLFISH IMMUNOLOGY
Volume 83, Issue -, Pages 1-7Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.fsi.2018.09.001
Keywords
MyD88; Holothuria leucospilota; Nuclear factor-kappa B; Activator protein 1; Proinflammatory cytokines; Apoptosis; Innate immunity
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences, China [XDA13020205]
- Key Projects in the National Science & Technology Pillar Program during the 12th Five-year Plan Period, China [2012BAD18B03]
- Guangdong Province Program, China [2017B030314052, 2015A030310120, A2015230]
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In this study, a myeloid differentiation factor 88 (MyD88) named as HLMyD88 was identified from the sea cucumber Holothuria leucospilota. The full-length cDNA of HLMyD88 is 4797 bp in size, containing a 227 bp 5'-untranslated region (UTR), a 3721 bp 3'-UTR and an 849 bp open reading frame (ORF) encoding a protein of 282 amino acids with a deduced molecular weight of 32.25 kDa HLMyD88 contains an N-terminal death domain and a C-terminal Toll/interluekin-1 receptor (TIR) domain with three highly conserved sequence motifs named as Box 1, Box 2 and Box 3. The results of luciferase reporter assay showed that over-expressed HLMyD88 in HEK293T cells could activate the transcription factors nuclear factor-kappa B (NF-kappa B) and activator protein 1 (AP-1). Additionally, the secretion of proinflammatory cytokines IL-1 beta and TNF-alpha in the HEK293T cells was increased by over-expressed HLMyD88, indicating the potential role of HLMyD88 in the innate immunity of sea cucumber. Moreover, we further confirmed that over-expressed HLMyD88 could also induce apoptosis.
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