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Aging and diets regulate the rat anterior pituitary and hypothalamic transcriptome
Karine Bédard1, Julie Bédard, Ghislain Rocheleau
1Laboratory of Neuroendocrinology of Aging, Centre hospitalier de l'Université de Montréal Research Center (CRCHUM), Montreal, Qué., Canada.
Neuroendocrinology
|April 28, 2012
Summary
Long-term moderate caloric restriction (LTMCR) benefits aging by protecting pituitary gene expression, particularly for stress and cell death pathways. Soy diets had minimal impact on gene regulation in aging rats.
Area of Science:
- Aging and Metabolism
- Molecular Biology
- Neuroendocrinology
Background:
- Caloric restriction (CR) is a potent strategy to mitigate age-related decline across tissues and species.
- Aging impacts gene expression in the anterior pituitary and hypothalamus, affecting cellular defense and repair mechanisms.
- Understanding the molecular basis of CR's benefits is crucial for developing interventions against age-related diseases.
Purpose of the Study:
- To investigate the effects of aging, long-term moderate caloric restriction (LTMCR), and dietary soy on gene expression in rat pituitary and hypothalamus.
- To identify molecular targets and signaling pathways involved in aging and the protective effects of LTMCR.
- To assess the impact of dietary protein quality (casein vs. soy) on age-related gene regulation.
Main Methods:
- Microarray analysis of gene expression in the anterior pituitary and hypothalamus of Sprague-Dawley rats.
- Comparison of gene expression profiles between young, aged, aged+LTMCR, and aged+soy groups.
- Focus on genes related to apoptosis, DNA repair, cellular stress, and immune response.
Main Results:
- Aging significantly altered genes involved in cellular defense and repair in both tissues.
- LTMCR demonstrated protective effects on age-related gene expression changes in the pituitary, particularly for stress and cell death pathways.
- Dietary soy had a minimal impact on mRNA levels in both aging pituitary and hypothalamus.
- LTMCR mitigated aging-induced changes in insulin-like growth factor-binding protein-3 (IGFBP-3) gene expression.
Conclusions:
- LTMCR offers significant protection against age-related gene expression alterations in the pituitary.
- Novel pituitary and hypothalamic molecular targets and pathways involved in aging and LTMCR benefits were identified.
- Dietary soy protein does not significantly alter age-related gene expression patterns in these tissues.
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