Research: HÖPER and COLLEAGUES,

Listed in Issue 248

Abstract

HÖPER and COLLEAGUES,  (1)Cardiovascular Research Group, Department of Medical Biology, Faculty of Health Sciences, Institute of Medical Biology, University of Tromsø, N-9037 Tromsø, Norway studied, in mice,  the effects of oil extracted from the zooplankton Calanus finmarchicus (Calanus oil) on diet-induced obesity and obesity-related disorders.

Background

The aim of the present study was to investigate the effects of oil extracted from the zooplankton Calanus finmarchicus (Calanus oil) on diet-induced obesity and obesity-related disorders in mice.

Methodology

C57BL/6J mice fed a high-fat diet (HFD, 45% energy from fat) exhibited increased body weight and abdominal fat accumulation as well as impaired glucose tolerance compared with mice fed a normal chow diet (10% energy from fat).

Results

Supplementing the HFD with 1.5% (w/w) Calanus oil reduced body-weight gain, abdominal fat accumulation and hepatic steatosis by 16, 27 and 41%, respectively, and improved glucose tolerance by 16%. Calanus oil supplementation reduced adipocyte size and increased the mRNA expression of adiponectin in adipose tissue. It also reduced macrophage infiltration by more than 70%, accompanied by reduced mRNA expression of pro-inflammatory cytokines (TNF-α, IL-6 and monocyte chemotactic protein-1). The effects of Calanus oil were not only preventive, but also therapeutic, as the oil proved to be beneficial, regardless of whether the supplementation was started before or after the onset of obesity and glucose intolerance.

Conclusion

Although the present study cannot pinpoint the active component(s) of the oil, there is reason to believe that the n-3 fatty acids EPA and DHA and/or antioxidants are responsible for its beneficial effects. It should be noted that the concentration of n-3 fatty acids in the Calanus oil diet was considerably lower than the concentrations used in similar studies reporting beneficial effects on obesity and obesity-related abnormalities.

References

Höper AC(1), Salma W, Khalid AM, Hafstad AD, Sollie SJ, Raa J, Larsen TS, Aasum E. Oil from the marine zooplankton Calanus finmarchicus improves the cardiometabolic phenotype of diet-induced obese mice. Br J Nutr. 110(12):2186-93. Dec 2013. doi: 10.1017/S0007114513001839. Epub Jun 17 2013.

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