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Mitochondrial-encoded gene regulation in rat pancreatic islets
B Lee1, M Srinivasan, R Aalinkeel
1Department of Pharmacology and Toxicology, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, 14214, USA.
Metabolism: Clinical and Experimental
|March 7, 2001
Summary
Aging impacts mitochondrial gene expression in pancreatic islets, affecting insulin secretion. Nutritional status also modulates expression in infant rats, highlighting age-related metabolic changes.
Area of Science:
- Metabolic regulation
- Mitochondrial biology
- Endocrinology
Background:
- Mitochondrial adenosine triphosphate (ATP) generation is crucial for insulin secretion by pancreatic islet beta cells.
- Understanding the influence of aging and nutrition on mitochondrial gene expression is vital for metabolic health.
Purpose of the Study:
- To investigate the relationship between age, nutritional status, and mitochondrial gene messenger RNA (mRNA) expression in rat pancreatic islets.
- To characterize the expression of specific mitochondrial genes (CYO, NADH-DH4, ATP-SYN6) across different age groups and dietary conditions.
Main Methods:
- Utilized semiquantitative reverse-transcriptase polymerase chain reaction (RT-PCR) to analyze mRNA expression.
- Studied infant, young, and old rats, including artificially reared pups on high carbohydrate (HC) diets.
- Examined the effect of glucose stimulation on isolated islets from young and old rats.
Main Results:
- Mitochondrial cytochrome oxidase subunit II (CYO-II) mRNA expression was significantly higher in young and old rats compared to infants.
- NADH dehydrogenase subunit 4 (NADH-DH4) and ATP synthase subunit 6 (ATP-SYN6) mRNA levels were lower in young rats versus infants.
- High carbohydrate diet in infant rats increased CYO-II mRNA, while glucose stimulation did not alter mitochondrial gene expression in adult rats.
Conclusions:
- Aging significantly alters the differential expression of specific mitochondrial genes (CYO-II, NADH-DH4, ATP-SYN6) in rat pancreatic islets.
- Nutritional factors, particularly high carbohydrate intake, can modulate mitochondrial gene expression in infant islets.
- Mitochondrial gene expression in pancreatic islets is sensitive to age and early-life nutrition, with implications for insulin secretion and metabolic control.