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Metabolic adaptations to early life protein restriction differ by offspring sex and post-weaning diet in the mouse.

ABSTRACT: Low birth weight affects 1 in every 7 babies born globally and can predict a lifetime of increased risk for adverse health outcomes, including cardiovascular disease, hypertension, obesity, diabetes, and metabolic syndrome. Maternal low protein diet during pregnancy and lactation is a well-characterized rat model for low birth weight and the subsequent increase in chronic disease risk. However, mice have been relatively understudied in this paradigm and represent a critical resource for investigating the underlying molecular mechanisms that link adverse early life experience and the development of chronic disease.The present manuscript describes a mouse model of low birth weight (maternal consumption of low protein diet (8% protein) through pregnancy and lactation) and characterizes metabolic adaptations (food intake, locomotor activity, oxygen consumption, and glucose tolerance) in male and female offspring. At weaning, mice were maintained either on the control diet or a high fat diet. Notable sex differences were observed, with male mice from the low protein pregnancies showing increased food intake, hyperactivity and increased metabolic rate only when weaned to the high fat diet, while female mice consistently showed increased food intake and were hypometabolic, regardless of post-weaning diet.These data identify offspring sex and post-weaning diet as critical variables in the metabolic adaptations to early life protein deficiency, and suggest that females may be more vulnerable to the adverse long-term health consequences of low birth weight.

SUBMITTER: Whitaker KW

PROVIDER: S-EPMC3183163 | biostudies-literature | 2012 Dec

REPOSITORIES: biostudies-literature

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Metabolic adaptations to early life protein restriction differ by offspring sex and post-weaning diet in the mouse.

Whitaker K W KW Totoki K K Reyes T M TM

Nutrition, metabolism, and cardiovascular diseases : NMCD 20110624 12

<h4>Background and aims</h4>Low birth weight affects 1 in every 7 babies born globally and can predict a lifetime of increased risk for adverse health outcomes, including cardiovascular disease, hypertension, obesity, diabetes, and metabolic syndrome. Maternal low protein diet during pregnancy and lactation is a well-characterized rat model for low birth weight and the subsequent increase in chronic disease risk. However, mice have been relatively understudied in this paradigm and represent a cr ...[more]

PMID: 21704502

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Project description:Aims:Obesity during pregnancy increases risk of cardiovascular disease (CVD) in the offspring and individuals exposed to over-nutrition during fetal life are likely to be exposed to a calorie-rich environment postnatally. Here, we established the consequences of combined exposure to a maternal and post-weaning obesogenic diet on offspring cardiac structure and function using an established mouse model of maternal diet-induced obesity. Methods and results:The impact of the maternal and postnatal environment on the offspring metabolic profile, arterial blood pressure, cardiac structure, and function was assessed in 8-week-old C57BL/6 male mice. Measurement of cardiomyocyte cell area, the transcriptional re-activation of cardiac fetal genes as well as genes involved in the regulation of contractile function and matrix remodelling in the adult heart were determined as potential mediators of effects on cardiac function. In the adult offspring: a post-weaning obesogenic diet coupled with exposure to maternal obesity increased serum insulin (P?<?0.0001) and leptin levels (P?<?0.0001); maternal obesity (P?=?0.001) and a post-weaning obesogenic diet (P?=?0.002) increased absolute heart weight; maternal obesity (P?=?0.01) and offspring obesity (P?=?0.01) caused cardiac dysfunction but effects were not additive; cardiac dysfunction resulting from maternal obesity was associated with re-expression of cardiac fetal genes (Myh7: Myh6 ratio; P?=?0.0004), however, these genes were not affected by offspring diet; maternal obesity (P?=?0.02); and offspring obesity (P?=?0.05) caused hypertension and effects were additive. Conclusions:Maternal diet-induced obesity and offspring obesity independently promote cardiac dysfunction and hypertension in adult male progeny. Exposure to maternal obesity alone programmed cardiac dysfunction, associated with hallmarks of pathological left ventricular hypertrophy, including increased cardiomyocyte area, upregulation of fetal genes, and remodelling of cardiac structure. These data highlight that the perinatal period is just as important as adult-onset obesity in predicting CVD risk. Therefore, early developmental periods are key intervention windows to reduce the prevalence of CVD.

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Metabolic adaptations to early life protein restriction differ by offspring sex and post-weaning diet in the mouse.

Publications

Metabolic adaptations to early life protein restriction differ by offspring sex and post-weaning diet in the mouse.

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