Detection and quantification of protein phosphatase inhibitor-1 gene expression in total rat liver and isolated hepatocytes
The mRNA expression of protein phosphatase inhibitor-1 (inhibitor-1) in rat liver was demonstrated using highly sensitive semi-quantitative reverse transcription polymerase chain reaction (RT-PCR). Quantification by real-time RT-PCR (LightCycler technology) yielded the same copy number of inhibitor-...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2001
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| In: |
Molecular and cellular biochemistry
Year: 2001, Volume: 217, Issue: 1, Pages: 1-12 |
| ISSN: | 1573-4919 |
| DOI: | 10.1023/A:1007141514750 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1023/A:1007141514750 Verlag, Volltext: https://doi.org/10.1023/A:1007141514750 
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| Author Notes: | Eiman A. Aleem, Thomas Flohr, Andreas Hunziker, Doris Mayer, Peter Bannasch and Heinz Walter Thielmann |
| Summary: | The mRNA expression of protein phosphatase inhibitor-1 (inhibitor-1) in rat liver was demonstrated using highly sensitive semi-quantitative reverse transcription polymerase chain reaction (RT-PCR). Quantification by real-time RT-PCR (LightCycler technology) yielded the same copy number of inhibitor-1 mRNA in total rat liver and isolated hepatocytes (12 copies per cell). This novel finding shows that rat liver expresses indeed inhibitor-1 mRNA, albeit in low amounts. The low copy number explains why the mRNA had not been detected by Northern blotting so far. For comparison, about 425 copies/cell were detected in brain and 2500 copies/cell in skeletal muscle from rat. The full-length coding sequence of rat liver inhibitor-1 was cloned and sequenced, 100% homology with the muscle cDNA was obtained, indicating the expression of the same gene in liver and muscle. In vitro transcription and translation yielded a protein (Mr ~ 30 kDa) which could be detected with a specific antibody by immunoblotting. This indicates an intact open reading frame of inhibitor-1 in rat liver. Immunoblotting of liver extract yielded a very weak band which comigrated with the inhibitor-1 proteins from muscle and brain. It is concluded that mRNA expression of inhibitor-1 may have implications for the regulation of protein phosphatase-1 (PP1) in rat liver. |
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| Item Description: | Gesehen am 08.02.2019 |
| Physical Description: | Online Resource |
| ISSN: | 1573-4919 |
| DOI: | 10.1023/A:1007141514750 |