Caenorhabditis elegans as a model system to study post-translational modifications of human transthyretin

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Oxidative post-translational protein modifications (PTPMs) affect transthyretin (TTR) in various diseases.
• Understanding TTR's structure-function relationships in oxidative PTPMs is crucial for elucidating pathophysiologic mechanisms.
• In vivo analysis of TTR in mammalian models is complex and resource-intensive.

Purpose of the Study:

• To establish and validate a transgenic Caenorhabditis elegans model for studying in vivo oxidative PTPMs of human TTR (hTTR).
• To characterize drug-mediated oxidative PTPMs of hTTR using this model.
• To investigate the metabolism of hTTR throughout its life cycle.

Main Methods:

• Utilized transgenic Caenorhabditis elegans expressing hTTR.
• Employed matrix assisted laser desorption/ionization - time of flight - mass spectrometry (MALDI-TOF-MS) for PTPM analysis.
• Exposed worms to D-penicillamine and menadione to assess drug effects.

Main Results:

• Confirmed hTTR expression across all developmental stages in C. elegans.
• Demonstrated that D-penicillamine and menadione induce significant changes in the oxidative PTPM pattern of hTTR.
• Identified and verified the covalent binding of D-penicillamine and menadione to hTTR using molecular modeling.

Conclusions:

• Transgenic C. elegans provides an efficient in vivo model for studying oxidative PTPMs of hTTR.
• This model facilitates the identification and characterization of drug-induced modifications to hTTR.
• The findings contribute to understanding TTR's role in disease and potential drug interactions.