title: Soy protein is beneficial but high-fat diet and voluntary running are detrimental to bone structure in mice.
abstract: Physical activity and soy protein isolate (SPI) augmentation have been reported to be beneficial for bone health. We hypothesized that combining voluntary running and SPI intake would alleviate detrimental changes in bone induced by a high-fat diet. A 2 × 2 × 2 experiment was designed with diets containing 16% or 45% of energy as corn oil and 20% SPI or casein fed to sedentary or running male C57BL/6 mice for 14 weeks. Distal femurs were assessed for microstructural changes. The high-fat diet significantly decreased trabecular number (Tb.N) and bone mineral density (BMD) and increased trabecular separation (Tb.Sp). Soy protein instead of casein, regardless of fat content, in the diet significantly increased bone volume fraction, Tb.N, connectivity density, and BMD and decreased Tb.Sp. Voluntary running, regardless of fat content, significantly decreased bone volume fraction, Tb.N, connectivity density, and BMD and increased Tb.Sp. The high-fat diet significantly decreased osteocalcin and increased tartrate-resistant acid phosphatase 5b (TRAP 5b) concentrations in plasma. Plasma concentrations of osteocalcin were increased by both SPI and running. Running alleviated the increase in TRAP 5b induced by the high-fat diet. These findings demonstrate that a high-fat diet is deleterious, and SPI is beneficial to trabecular bone properties. The deleterious effect of voluntary running on trabecular structural characteristics indicates that there may be a maximal threshold of running beyond which beneficial effects cease and detrimental effects occur. Increases in plasma osteocalcin and decreases in plasma TRAP 5b in running mice suggest that a compensatory response occurs to counteract the detrimental effects of excessive running.
authors.affiliation: US Department of Agriculture, Agricultural Research Service, Grand Forks Human Nutrition Research Center, Grand Forks, ND 58202. Electronic address: lin.yan@ars.usda.gov.
authors.forename: Lin
authors.initials: L
authors.lastname: Yan
authors.affiliation: Department of Agronomy, University of Nebraska-Lincoln, Lincoln, NE 68583.
authors.forename: George L
authors.initials: GL
authors.lastname: Graef
authors.affiliation: US Department of Agriculture, Agricultural Research Service, Grand Forks Human Nutrition Research Center, Grand Forks, ND 58202.
authors.forename: Forrest H
authors.initials: FH
authors.lastname: Nielsen
authors.affiliation: US Department of Agriculture, Agricultural Research Service, Grand Forks Human Nutrition Research Center, Grand Forks, ND 58202.
authors.forename: LuAnn K
authors.initials: LK
authors.lastname: Johnson
authors.affiliation: US Department of Agriculture, Agricultural Research Service, Grand Forks Human Nutrition Research Center, Grand Forks, ND 58202.
authors.forename: Jay
authors.initials: J
authors.lastname: Cao
mesh_terms: D000135:Acid Phosphatase / Q000097:blood; D000818:Animals; D015519:Bone Density / Q000187:drug effects; D059305:Diet, High-Fat / Q000009:adverse effects*; D004041:Dietary Fats / Q000008:administration & dosage / Q000009:adverse effects*; D005269:Femur / Q000033:anatomy & histology / Q000187:drug effects / Q000378:metabolism; D007527:Isoenzymes / Q000097:blood; D008297:Male; D008810:Mice, Inbred C57BL; D009765:Obesity / Q000150:complications; D015675:Osteocalcin / Q000097:blood; D012420:Running / Q000502:physiology*; D030262:Soybean Proteins / Q000494:pharmacology*; D013025:Glycine max / Q000737:chemistry*; D000071681:Tartrate-Resistant Acid Phosphatase
chemical_list: D004041:Dietary Fats; D007527:Isoenzymes; D030262:Soybean Proteins; D015675:Osteocalcin; D000135:Acid Phosphatase; C000605511:Acp5 protein, mouse; D000071681:Tartrate-Resistant Acid Phosphatase
keywords: Bone; Fat; Mice; Running; Soy