Effects of chronic vs. intermittent calorie restriction on mammary tumor incidence and serum adiponectin and leptin levels in MMTV-TGF-α mice at different ages

Dogan,Soner; Rogozina,Olga P.; Lokshin,Anna E.; Grande,Joseph P.; Cleary,Margot P.

doi:10.3892/ol_00000031

Effects of chronic vs. intermittent calorie restriction on mammary tumor incidence and serum adiponectin and leptin levels in MMTV-TGF-α mice at different ages

Authors:
- Soner Dogan
- Olga P. Rogozina
- Anna E. Lokshin
- Joseph P. Grande
- Margot P. Cleary
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Affiliations: Hormel Institute, University of Minnesota, Austin, MN 55912, USA
Published online on: January 1, 2010 https://doi.org/10.3892/ol_00000031
Pages: 167-176

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Abstract

Calorie restriction prevents mammary tumor (MT) development in rodents. Usually, chronic calorie restriction (CCR) has been implemented. In contrast, intermittent calorie restriction (ICR) has been less frequently used. Recent studies indicate that when a direct comparison of the same degree of CCR vs. ICR was made using MMTV-TGF-α mice which develop MTs in the second year of life, ICR provided greater protection than CCR in delaying MT detection and reducing tumor incidence. Adiponectin and leptin are two adipocyto-kines secreted from adipose tissue which have opposite effects on many physiological functions, including proliferation of human breast cancer cells. A recent study indicated that a low adiponectin/leptin ratio was associated with breast cancer. We evaluated the relationship of adiponectin and leptin to MT development in MMTV-TGF-α calorie-restricted mice at several ages. Mice were enrolled at 10 weeks of age and subjected to 25% caloric reduction implemented either chronically or intermittently. Mice were euthanized at designated time points up to 74 weeks of age. Serum samples were collected to measure adiponectin and leptin concentrations. Both CCR and ICR mice had significantly reduced MT incidence. For the groups studied, serum leptin increased over time, while there was a trend for an increase in serum adiponectin levels in ad libitum and ICR mice, with no change in CCR mice between 10 and 74 weeks of age. The adiponectin/leptin ratio was significantly reduced as mice aged, but this ratio in ICR mice was significantly higher than that for ad libitum and CCR mice. No correlation was noted between serum adiponectin and leptin. These findings demonstrate that intermittent calorie restriction delays the early development of MTs. This delay was associated with reduced serum leptin levels following the restriction phases of the protocol. Additionally, serum leptin levels correlated with body weight and body fat in the groups studied.

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