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Muscle Protein Synthesis in Dialysis Patients

NCT03478722 · Status: COMPLETED · Type: OBSERVATIONAL · Enrollment: 16

Last updated 2018-05-01

No results posted yet for this study

Summary

The most severe form of chronic renal failure is end-stage-renal-disease with maintenance hemodialysis (MHD) as the most common treatment strategy. MHD patients experience a number of metabolic and phenotypic derangements including skeletal muscle wasting. Previously, it has been demonstrated that dialysis treatment leads to increased rates of forearm phenylalanine uptake (proxy for 'muscle' protein synthesis) with an even greater rates of phenylalanine release (proxy for 'muscle' protein breakdown). Hence, the dialysis procedure itself is catabolic and induces a catabolic carryover for several hours after dialysis. This suggests prolonged post-dialysis disturbances in whole body- and skeletal muscle protein metabolism in MHD patients. Moreover, dialysis treatment in itself results in \~20 % losses of circulating amino acids in the dialysate. Collectively, this creates the need for replacement of amino acids by protein supplementation during and/or after dialysis. The ingestion of protein-dense meals in between dialysis treatments likely represents an important dietary strategy to counterbalance dialysis-induced catabolism and to achieve the current recommended protein intakes (set at 1.2 g/kg bodyweight/d) to limit muscle protein loss in MHD patients. However, the effectiveness of protein-rich meal ingestion to augment postprandial whole body and muscle protein metabolic responses in MHD patients outside of the dialysis period remain largely undefined.

The purpose of this study is to compare basal and postprandial whole body leucine body kinetics, muscle anabolic sensing mechanisms, markers of muscle proteolysis, and myofibillar protein synthesis rates to mixed meal ingestion on a non-dialysis day in eight MHD patients, between 20-80 and to compare these outcomes to age- and BMI-matched controls. The investigators will use specifically produced intrinsically L-\[5,5,5-2H3\]leucine labeled eggs combined with primed constant amino acid tracer infusion methods and concomitant blood and muscle direct sampling to make direct assessments of in vivo protein digestion and absorption kinetics and subsequent postprandial muscle protein synthetic responses in MHD patents and controls. On the test day, subjects will remain sedentary for the determination of muscle protein synthesis in both the fasted state and after consumption of the meal.

Conditions

  • Muscle Loss

Interventions

OTHER

Protein Meal

Ingestion of mixed meal containing 20 g of dietary protein

OTHER

Stable Isotope Amino Acid Infusion

Continuous infusion of L-\[1-13C\]leucine (0.13 μmol⋅kg⋅min) and L-\[ring- 2H5\]phenylalanine (0.05 μmol⋅kg⋅min)

Sponsors & Collaborators

  • University of Illinois at Urbana-Champaign

    lead OTHER

Principal Investigators

  • Nicholas A Burd, PhD · University of Illinois, Urbana-Champaign

Eligibility

Min Age
20 Years
Max Age
80 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2017-01-18
Primary Completion
2017-12-15
Completion
2018-04-01

Countries

  • United States

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT03478722 on ClinicalTrials.gov