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Defects in β-cell Ca2+ dynamics in age-induced diabetes
Luosheng Li1, Aleksandra Trifunovic2, Martin Köhler1
1The Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden.
Diabetes
|July 3, 2014
Summary
Aging impairs insulin release and glucose homeostasis by altering calcium dynamics in mouse beta cells, linked to reduced mitochondrial function. These subtle cellular changes contribute to a diabetic phenotype.
Area of Science:
- Cellular biology
- Endocrinology
- Aging research
Background:
- Age-dependent deterioration of pancreatic beta-cell function impacts glucose homeostasis.
- Molecular mechanisms driving these age-related changes remain largely unknown.
Purpose of the Study:
- To investigate the molecular mechanisms of age-dependent decline in beta-cell function.
- To elucidate the role of calcium (Ca2+) dynamics and mitochondrial function in aging beta-cells.
Main Methods:
- Utilized three mouse models: premature aging (mitochondrial DNA mutations), mature aging (C57BL/6), and aging-resistant (129 mouse).
- Assessed age-dependent changes in beta-cell Ca2+ dynamics, insulin release, and mitochondrial function.
Main Results:
- Aging is associated with impaired insulin release and glucose homeostasis in mice.
- Subtle alterations in beta-cell Ca2+ dynamics, including impaired mitochondrial function, phospholipase C/inositol 1,4,5-trisphosphate-mediated Ca2+ mobilization, and decreased Ca2+ influx, were observed.
- Progressive decline in beta-cell mitochondrial function negatively impacts Ca2+ dynamics tuning.
Conclusions:
- Age-related decline in beta-cell mitochondrial function is a key factor in impaired insulin release.
- Modest changes in beta-cell signal transduction over time can lead to compromised insulin secretion and a diabetic phenotype.
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