β-Lactoglobulin Is Insulinotropic Compared with Casein and Whey Protein Ingestion during Catabolic Conditions in Men in a Double-Blinded Randomized Crossover Trial

© The Author(s) 2021. Published by Oxford University Press on behalf of the American Society for Nutrition..

BACKGROUND: Muscle loss during acute infectious disease is mainly triggered by inflammation, immobilization, and malnutrition.

OBJECTIVE: The objective was to compare muscle protein kinetics and metabolism following ingestion of the dairy protein supplements β-lactoglobulin (BLG), casein (CAS), and whey (WHE) during controlled catabolic conditions.

METHODS: We used a randomized crossover design (registered at clinicaltrials.gov as NCT03319550) to investigate 9 healthy male participants [age: 20-40 y; BMI (in kg/m2) 20-30] who were randomly assigned servings of BLG, CAS, or WHE (0.6 g protein/kg, one-third as bolus and two-thirds as sip every 20 min) on 3 separate occasions separated by ∼6-8 wk. The participants received an infusion of lipopolysaccharide (1 ng/kg) combined with 36 h of fasting and bed rest before each study day, mimicking a clinical catabolic condition. The forearm model and isotopic tracer techniques were used to quantify muscle protein kinetics. Muscle biopsy specimens were obtained and intramyocellular signaling investigated using Western blot.

RESULTS: BLG, CAS, and WHE improved the net balance of phenylalanine (NBphe) from baseline with ∼75% (P < 0.001) with no difference between interventions (primary outcome, P < 0.05). No difference in rates of appearance and disappearance of phenylalanine or in intramyocellular signaling activation was found between interventions (secondary outcomes). The incremental AUC for serum insulin was 62% higher following BLG compared with CAS (P < 0.001) and 30% higher compared with WHE (P = 0.002), as well as 25% higher in WHE compared with CAS (P = 0.006). Following BLG consumption, plasma concentrations of glucose-dependent insulinotropic peptide (GIP) increased 70% compared with CAS (P = 0.001) and increased 34% compared with WHE (P = 0.06). No significant difference was found between WHE and CAS (P = 0.12).

CONCLUSION: BLG, WHE, and CAS have similar effects on muscle in young male participants during catabolic conditions. BLG showed specific, possibly GIP-dependent, insulinotropic properties, which may have future clinical implications.

Medienart:

E-Artikel

Erscheinungsjahr:

2021

Erschienen:

2021

Enthalten in:

Zur Gesamtaufnahme - volume:151

Enthalten in:

The Journal of nutrition - 151(2021), 6 vom: 01. Juni, Seite 1462-1472

Sprache:

Englisch

Beteiligte Personen:

Mose, Maike [VerfasserIn]
Møller, Niels [VerfasserIn]
Jessen, Niels [VerfasserIn]
Mikkelsen, Ulla Ramer [VerfasserIn]
Christensen, Britt [VerfasserIn]
Rakvaag, Elin [VerfasserIn]
Hartmann, Bolette [VerfasserIn]
Holst, Jens Juul [VerfasserIn]
Jørgensen, Jens Otto Lunde [VerfasserIn]
Rittig, Nikolaj [VerfasserIn]

Links:

Volltext

Themen:

47E5O17Y3R
59392-49-3
Caseins
Dairy protein
Endotoxemia
Fasting
Gastric Inhibitory Polypeptide
Immobilization
Journal Article
Lactoglobulins
Muscle Proteins
Phenylalanine
Randomized Controlled Trial
Research Support, Non-U.S. Gov't
Skeletal muscle
Whey Proteins

Anmerkungen:

Date Completed 10.01.2022

Date Revised 16.02.2023

published: Print

ClinicalTrials.gov: NCT03319550

Citation Status MEDLINE

doi:

10.1093/jn/nxab010

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM322508207