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Senescence marker protein-30 (SMP30): structure and biological function
1Department of Molecular Pathology, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakaecho, Tokyo-, Itabashi-ku, 1730015, Japan.
Biochemical and Biophysical Research Communications
|January 28, 1999
Summary
Senescence marker protein-30 (SMP30) levels decrease with age in liver and kidney cells. This protein regulates calcium homeostasis, and its decline may contribute to age-related organ deterioration.
Area of Science:
- Biochemistry
- Gerontology
- Molecular Biology
Background:
- Senescence marker protein-30 (SMP30) is expressed in liver and kidney cells and decreases with age.
- SMP30 shows high conservation across species but is absent in yeast.
- SMP30 is identical to the calcium-binding protein regucalcin (RC).
Purpose of the Study:
- To investigate the function of SMP30.
- To understand the role of SMP30 in calcium homeostasis and aging.
- To explore the implications of SMP30 down-regulation in age-related organ decline.
Main Methods:
- Cloning of SMP30 cDNAs from rats, mice, and humans.
- Determination of mouse SMP30 genome organization and 5' flanking region.
- Transfection of Hep G2 cells with human SMP30 cDNA to create stable high-expression cell lines.
Main Results:
- SMP30's amino acid sequence is highly conserved among rats, mice, and humans.
- Overexpression of SMP30 in Hep G2 cells enhanced Ca2+-pumping activity in plasma membranes.
- Results suggest SMP30 regulates Ca2+ homeostasis.
Conclusions:
- SMP30 plays a critical role in the differentiated functions of the liver and kidney.
- SMP30 significantly impacts Ca2+ homeostasis.
- The age-related decrease in SMP30 may contribute to the deterioration of liver and kidney functions.