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Nutrients. 2014 Dec 1;6(12):5500-16. doi: 10.3390/nu6125500.

Bee pollen improves muscle protein and energy metabolism in malnourished old rats through interfering with the Mtor signaling pathway and mitochondrial activity.

Author information

1
INRA, UMR1019, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand F-63000, France. Jerome.Salles@clermont.inra.fr.
2
Pollenergie, La Grabère, St Hilaire de Lusignan F-47450, France. nicolas.cardinault@gmail.com.
3
INRA, UMR1019, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand F-63000, France. veronique.patrac@clermont.inra.fr.
4
INRA, UMR1019, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand F-63000, France. alexandre.berry@clermont.inra.fr.
5
INRA, UMR1019, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand F-63000, France. christophe.giraudet@clermont.inra.fr.
6
INRA, UMR1019, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand F-63000, France. marie-laure.collin@clermont.inra.fr.
7
INRA, UMR1019, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand F-63000, France. audrey.chanet@clermont.inra.fr.
8
INRA, UMR1019, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand F-63000, France. camille.tagliaferri@clermont.inra.fr.
9
INRA, UMR1019, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand F-63000, France. philippe.denis@clermont.inra.fr.
10
INRA, UMR1019, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand F-63000, France. corinne.pouyet@clermont.inra.fr.
11
INRA, UMR1019, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand F-63000, France. boirie@clermont.inra.fr.
12
INRA, UMR1019, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand F-63000, France. swalrand@clermont.inra.fr.

Abstract

Although the management of malnutrition is a priority in older people, this population shows a resistance to refeeding. Fresh bee pollen contains nutritional substances of interest for malnourished people. The aim was to evaluate the effect of fresh bee pollen supplementation on refeeding efficiency in old malnourished rats. Male 22-month-old Wistar rats were undernourished by reducing food intake for 12 weeks. The animals were then renourished for three weeks with the same diet supplemented with 0%, 5% or 10% of fresh monofloral bee pollen. Due to changes in both lean mass and fat mass, body weight decreased during malnutrition and increased after refeeding with no between-group differences (p < 0.0001). Rats refed with the fresh bee pollen-enriched diets showed a significant increase in muscle mass compared to restricted rats (p < 0.05). The malnutrition period reduced the muscle protein synthesis rate and mTOR/p70S6kinase/4eBP1 activation, and only the 10%-pollen diet was able to restore these parameters. Mitochondrial activity was depressed with food restriction and was only improved by refeeding with the fresh bee pollen-containing diets. In conclusion, refeeding diets that contain fresh monofloral bee pollen improve muscle mass and metabolism in old, undernourished rats.

PMID:
25470375
PMCID:
PMC4276980
DOI:
10.3390/nu6125500
[Indexed for MEDLINE]
Free PMC Article

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