A novel dynamic proteomics approach for the measurement of broiler chicken protein fractional synthesis rate

Rationale

The study of protein synthesis in farm animals is uncommon despite of its potential to increase knowledge about metabolism and discover new biomarkers of health and growth status. The present study describes a novel dynamic proteomics approach for the measurement of protein FSR in broiler chickens.

Methods

Chickens received a 10g/kg oral dose of ²H₂O at day 21 of their life. Body water ²H abundance was measured in plasma samples using a portable FTIR spectrometer. Free and protein-bound AAs were isolated and had their ²H enrichment measured by GC/MS. Peptide ²H enrichment was measured by proteomics analysis of plasma and muscle samples. Albumin, fibrinogen and muscle protein FSR were calculated from GC/MS and proteomics data.

Results

Ala appeared to be more enriched at the site of protein synthesis than in the AA free pools. Glu was found to be the AA closest to isotopic equilibrium between the different AA pools. Glu was used as an anchor to calculate n (AA) values necessary for chicken protein FSR calculation in dynamic proteomics studies. FSR values calculated using proteomics data and GC/MS data showed good agreement as evidenced by a Bland-Altman residual plot.

Conclusions

A new dynamic proteomics approach for the measurement of broiler chicken individual protein FSR based on the administration of a single ²H₂O oral bolus has been developed and validated. The proposed approach could facilitate new immunological and nutritional studies on free living animals.