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Mimicking the Function of Signaling Proteins: Toward Artificial Signal Transduction Therapy
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Three members in JAK/STAT signal pathway from the sea cucumber Apostichopus japonicus: Molecular cloning,

Yina Shao1, Chenghua Li1, Weiwei Zhang1

  • 1School of Marine Sciences, Ningbo University, Ningbo 315211, PR China.

Fish & Shellfish Immunology
|July 25, 2015
PubMed

Insights

Researchers identified key JAK/STAT pathway genes in sea cucumbers, revealing their roles in immune defense against bacterial infections. AjSTAT5 and AjFOXP activate immune responses, while AjSOCS2 acts as an inhibitor, enhancing innate immunity.

Area of Science:

  • Marine Biology
  • Immunology
  • Molecular Biology

Background:

  • The JAK/STAT signal transduction pathway is crucial for host defense against bacterial infections.
  • Understanding this pathway in invertebrates like sea cucumbers provides insights into conserved immune mechanisms.

Purpose of the Study:

  • To clone and characterize three JAK/STAT pathway molecules (STAT5, FOXP, SOCS2) from the sea cucumber Apostichopus japonicus.
  • To investigate the immune functions of these molecules in response to bacterial infection and LPS exposure.

Main Methods:

  • Full-length cDNA cloning of AjSTAT5, AjFOXP, and AjSOCS2.
  • Bioinformatic analysis of protein domains and phylogenetic relationships.
  • Tissue-specific expression analysis using qPCR.
  • Gene silencing using siRNA to assess functional interactions.

Main Results:

  • Novel sea cucumber genes AjSTAT5, AjFOXP, and AjSOCS2 were identified, sharing conserved domains with vertebrate counterparts.
  • These genes are ubiquitously expressed, with specific patterns in different tissues.
  • Bacterial infection and LPS exposure upregulated AjSTAT5 and AjFOXP, while AjSOCS2 showed an opposite trend.
  • AjSTAT5 silencing affected AjFOXP and AjSOCS2 expression, indicating regulatory roles.

Conclusions:

  • AjSTAT5 and AjFOXP are involved in activating innate immune responses in sea cucumbers.
  • AjSOCS2 acts as an inhibitor within the JAK/STAT pathway, modulating immune responses.
  • This study expands the understanding of the JAK/STAT signaling pathway in marine invertebrate immunity.
Keywords:
Apostichopus japonicusFOXPImmune responseJAK/STATSOCS2STAT5

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