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Molecular insights and immune responses of big belly seahorse syndecan-2 (CD362): Involvement of ectodomain in regulating cell survival, proliferation, and wound healing

D.S. Liyanagea, W.K.M. Omekaa, M.D. NeranjanTharukaa,b, Sumi Junga,b, Sukkyoung Leea,b, Jehee Leea,b,*

aDepartment of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea
bMarine Science Institute, Jeju National University, Jeju Self-Governing Province, 63333, Republic of Korea
*Corresponding author

Abstract
Syndecan-2, also known as CD362, is a transmembrane heparan sulfate proteoglycan which regulates cell growth, proliferation, cell adhesion, wound healing, and recruits immune cells. In the present study, we performed bioinformatics, spatial and temporal expression analyses of Hippocampus abdominalis syndecan-2 (HaSDC-2). Additionally, functional assays were conducted. HaSDC-2 has five major domains; an extracellular heparan sulfate attachment domain, a co-receptor binding domain, a transmembrane domain, two conserved domains (C1 domain, C2 domain), and a variable (V) domain. The ectodomain contained a signal peptide and GAG attachment sites. In-silico analysis revealed that HaSDC-2 contained a 798 bp long ORF and protein sequence of 265 amino acid residues. Further analysis of the amino acid sequence predicted a 28.9 kDa molecular weight and a 4.13 theoretical isoelectric point. The spatial expression of HaSDC-2 was ubiquitous in all tested tissues. HaSDC-2 expression in the liver was upregulated 24 h post-injection in response to all stimuli. Further, HaSDC-2 expression in blood cells was upregulated at 12 and 72 h post-injection in response to all the stimuli. HaSDC-2 + pcDNA™3.1(+) transfected cells exhibited significant survival in response to cell stressors such as H2O2 and HED. The ectodomain of recombinant HaSDC-2 treated cells showed significant cell proliferation in a concentration-dependent manner. The scratch wound healing assay showed significant Δ gap closures with increasing concentrations of HaSDC-2. Collectively, these results indicated that syndecan-2 was involved in regulating immune responses and cell stress conditions.

Keywords:
Cell viability and proliferation; Immune challenge; SDC-2; Seahorse

논문정보
- 형식: Research article
- 게재일: 2020년 03월 (BRIC 등록일 2020-03-18)
- 연구진: 국내연구진 태극기
- 분야: Marine_Biology, Immunology
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