Abstract
Regular exercise and anabolic androgenic steroids have opposing effects on the plasma lipoprotein profile and risk of cardio-metabolic diseases in humans. Studies in humans and animal models show conflicting results. Here, we used a mice model genetically modified to mimic human lipoprotein profile and metabolism. They under-express the endogenous LDL receptor gene (R1) and express a human transgene encoding the cholesteryl ester transfer protein (CETP), normally absent in mice. The present study was designed to evaluate the independent and interactive effects of testosterone supplementation, exercise training and CETP expression on the plasma lipoprotein profile and CETP activity. CETP/R1 and R1 mice were submitted to a 6-week swimming training and mesterolone (MEST) supplementation in the last 3 weeks. MEST treatment increased markedly LDL levels (40%) in sedentary CETP/R1 mice and reduced HDL levels in exercised R1 mice (18%). A multifactorial ANOVA revealed the independent effects of each factor, as follows. CETP expression reduced HDL (21%) and increased non-HDL (15%) fractions. MEST treatment increased the VLDL concentrations (42%) regardless of other interventions. Exercise training reduced triacylglycerol (25%) and free fatty acids (20%), increased both LDL and HDL (25–33%), and reduced CETP (19%) plasma levels. Significant factor interactions showed that the increase in HDL induced by exercise is explained by reducing CETP activity and that MEST blunted the exercise-induced elevation of HDL-cholesterol. These results reinforce the positive metabolic effects of exercise, resolved a controversy about CETP response to exercise and evidenced MEST potency to counteract specific exercise benefits.
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Abbreviations
- AAS:
-
Anabolic androgenic steroids
- ANOVA:
-
Analysis of variance
- Apo:
-
Apolipoprotein
- ApoB:
-
Apolipoprotein B
- ApoE:
-
Apolipoprotein E
- CETP:
-
Cholesteryl ester transfer protein
- CETP/R1:
-
Mice over-expressing CETP and expressing only one allele of the endogenous LDL receptor gene
- CHOL:
-
Cholesterol
- CVD:
-
Cardiovascular diseases
- FFA:
-
Plasma-free fatty acids
- FPLC:
-
Fast protein liquid chromatography
- HDL:
-
High-density lipoproteins
- HL:
-
Hepatic lipase
- LDL:
-
Low-density lipoprotein
- LP:
-
Lipoproteins
- LPL:
-
Lipoprotein lipase
- MEST:
-
Mesterolone (1-alpha-methyl-5-alpha-androstan-17beta-ol-3-one)
- R1:
-
Mice expressing only one allele of the endogenous LDL receptor gene
- TAG:
-
Triacylglycerol
- VLDL:
-
Very low-density lipoprotein
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Acknowledgements
This work was supported by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP Grant #2011/50400-0) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq #310546/2014-1). We are grateful to Adriano Affonso Mariscal and Lescio Domingos Teixeira for technical assistance.
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ACC, JAB and LLST performed all experiments and analyzed data. ACC, JAB and HCFO conceived the study and wrote the manuscript. All authors revised and approved the final version of the manuscript.
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Casquero, A.C., Berti, J.A., Teixeira, L.L.S. et al. Chronic Exercise Reduces CETP and Mesterolone Treatment Counteracts Exercise Benefits on Plasma Lipoproteins Profile: Studies in Transgenic Mice. Lipids 52, 981–990 (2017). https://doi.org/10.1007/s11745-017-4299-1
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DOI: https://doi.org/10.1007/s11745-017-4299-1