Unveiling tryptophan dynamics and functions across model organisms via quantitative imaging

Area of Science:

• Biochemistry
• Neuroscience
• Immunology

Background:

• Tryptophan is an essential amino acid vital for serotonin and kynurenine production, influencing neural and immune functions.
• Accurate tryptophan measurement is crucial for understanding these complex biological processes.

Purpose of the Study:

• To develop and validate a novel method for quantitative tryptophan measurement.
• To investigate tryptophan dynamics across various biological scales, from cellular to whole-organism.

Main Methods:

• Development of a green ratiometric indicator for tryptophan (GRIT).
• Application of GRIT in bacteria, mammalian cell cultures (mitochondria), human serum, and zebrafish.
• Quantitative analysis of tryptophan dynamics in diverse biological systems.

Main Results:

• GRIT successfully quantified tryptophan dynamics in bacteria, cell cultures, serum, and zebrafish.
• Cellular-scale analyses revealed distinct tryptophan dynamics across cell types and organelles.
• Whole-organism studies in zebrafish demonstrated inflammation-induced tryptophan increases linked to elevated serotonin/kynurenine, prolonged sleep, and suggested a metabolic link between immunity and behavior.
• GRIT detected reduced serum tryptophan in patients with inflammation, indicating diagnostic potential.

Conclusions:

• GRIT is a powerful tool for studying tryptophan metabolism and its physiological roles.
• This method offers new insights into the metabolic regulation of health and disease.
• GRIT facilitates research across multiple biological scales, from cellular processes to organismal behavior.