A fas apoptotic inhibitory molecule from Ruditapes philippinarum: Investigation on molecular characterization and...

Area of Science:

• Marine Biology
• Immunology
• Molecular Biology

Background:

• The Fas apoptotic inhibitory molecule (FAIM) family plays a role in regulating apoptosis and immune responses.
• Understanding novel FAIMs in invertebrates can provide insights into conserved immune mechanisms.

Purpose of the Study:

• To identify and characterize a novel FAIM from the clam Ruditapes philippinarum (RpFAIM).
• To investigate the role of RpFAIM in the innate immune response of the clam.

Main Methods:

• Sequence analysis and phylogenetic analysis to confirm RpFAIM as a new FAIM family member.
• Quantitative real-time PCR to analyze RpFAIM expression in various tissues and after bacterial challenge.
• RNA interference (RNAi) to knock down RpFAIM expression and assess its effect on NF-κB signaling.
• Subcellular localization studies and apoptosis assays in HeLa cells.

Main Results:

• RpFAIM was identified and confirmed as a novel FAIM family member through sequence and phylogenetic analyses.
• RpFAIM transcripts were constitutively expressed in multiple tissues, predominantly in hemocytes, and significantly induced by bacterial challenge (Vibrio anguillarum, Micrococcus luteus).
• Knockdown of RpFAIM led to down-regulation of NF-κB signaling pathway genes and inhibited apoptosis in HeLa cells, suggesting a positive regulatory role in immunity.

Conclusions:

• RpFAIM is a novel FAIM with a conserved role in innate immunity.
• RpFAIM likely regulates NF-κB signaling pathways positively, contributing to the clam's immune defense.
• This study enhances the understanding of FAIM function in invertebrate innate immunity.