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Effects of ouabain on the growth and DNA synthesis of PC12 cells
1Department of Internal Medicine, University of Tokyo, Japan. katsuatky@umin.ac.jp
Abstract:
We investigated the effects of ouabain and serum from salt-loaded Dahl salt-sensitive (S) rats, which contain abundant ouabain-like compounds, on the growth and DNA synthesis of rat pheochromocytoma PC12 cells. Ouabain decreased the growth of PC12 cells, as evaluated by 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide assay, in a concentration-dependent fashion. A moderate concentration (10(-7) M) of ouabain increased DNA synthesis, as measured by 5-bromo-2'-deoxyuridine incorporation, and induced transcription of the proto-oncogenes c-myc and c-fos. Serum from salt-loaded Dahl S rats also enhanced DNA synthesis, but serum from Dahl salt-resistant rats did not. Thus ouabain-like compounds may modify the growth or differentiation of neural tissues. This effect may contribute to the development of salt-induced hypertension in Dahl S rats.
Insights
Ouabain and related compounds impact neural cell growth and DNA synthesis. These findings may explain salt-induced hypertension in Dahl salt-sensitive rats.
Area of Science:
- Biochemistry
- Cell Biology
- Cardiovascular Research
Background:
- Ouabain-like compounds (OLCs) are implicated in cardiovascular regulation.
- Dahl salt-sensitive (S) rats exhibit salt-induced hypertension, potentially linked to OLCs.
Purpose of the Study:
- To investigate the effects of ouabain and serum from salt-loaded rats on PC12 cell growth and DNA synthesis.
- To explore the role of OLCs in neural tissue modulation.
Main Methods:
- PC12 cells were treated with ouabain and serum from salt-loaded Dahl S and salt-resistant rats.
- Cell growth was assessed using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay.
- DNA synthesis was measured by 5-bromo-2'-deoxyuridine (BrdU) incorporation.
- Proto-oncogene transcription (c-myc, c-fos) was analyzed.
Main Results:
- Ouabain inhibited PC12 cell growth in a concentration-dependent manner.
- A moderate concentration of ouabain (10(-7) M) increased DNA synthesis and induced c-myc and c-fos transcription.
- Serum from salt-loaded Dahl S rats, but not salt-resistant rats, enhanced DNA synthesis.
Conclusions:
- Ouabain-like compounds can modulate neural cell growth and DNA synthesis.
- These effects may contribute to the development of salt-induced hypertension in Dahl S rats.
- OLCs represent a potential link between salt intake and cardiovascular changes in susceptible individuals.
