RESEARCH PAPER
The effect of fructan-enriched diet on bone turnover parameters in ovariectomized rats under calcium restriction
 
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1
Department of Nutrition Technology and Consumption, Faculty of Food Technology, University of Agriculture, Krakow, Poland
2
Department of Animal Physiology, Faculty of Veterinary Medicine, University of Life Sciences, Lublin, Poland
CORRESPONDING AUTHOR
Kinga Topolska   

University of Agriculture in Krakow, Faculty of Food Technology, Balicka 122, 30-149, Kraków, Poland
 
KEYWORDS
TOPICS
ABSTRACT
Introduction:
Osteoporosis, the “quiet epidemic”, is one of the most serious threats to public health. It is known that estrogen plays a significant role in the regulation of bone turnover, and its loss at menopause causes osteoporosis. Added to this, insufficient calcium intake accelerates bone mass loss, increasing the risk of fractures.

Objective:
The study aimed to answer the question whether a fructan-enriched diet could be helpful in preventing from disturbances in bone turnover caused by calcium restriction combined with ovariectomy-induced estrogen deficiency. The differences related to the kind of fructan and ‘matrix effect’ of fructan action (form of addition) were also evaluated.

Material and methods:
The study was conducted using sham-operated (control groups) or ovariectomized (OVX) rats fed a calcium restricted diet. The treatment diets contained one of three fructan sources – Jerusalem artichoke, yacon and Beneo Orafti Synergy1 – added alone or as an ingredient of strawberry sorbet, all in the amount providing 8% fructans. Analyses of biological material included: serum Ca, Mg and P concentrations, alkaline phosphatase activity (ALP), osteocalcin (OC) and C-telopeptide degradation products from type I collagen (CTX). Densitometric parameters of femora were also assayed.

Results:
Among markers of bone turnover, the ALP activity depended both on the kind of fructan and the form of addition. The highest value was shown in the OVX group fed a low-calcium diet, whereas administration of diet enriched with Jerusalem artichoke led to an almost 50% decrease in the value of this parameter. Dietary fructans also lowered the OC level. Feeding rats with diet containing sorbet enriched in yacon or Jerusalem artichoke resulted in a decrease of CTX, compared to the diet containing yacon alone or fructan formulation in both forms No significant differences were observed in densitometric parameters between treatment groups.

ACKNOWLEDGEMENTS
The study was founded by the National Science Centre Poland project, on the basis of Decision No. DEC-2011/01/B/ NZ9/03045.
 
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