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The relationship between protein and mRNA levels of mevalonate pyrophosphate decarboxylase (MPD) in rat tissues remains to be clarified. In this study, we examined the distribution of the mRNA in Wistar rat tissues by real-time PCR. When the relative expression of MPD in 1 mg of tissue was quantified using glyceraldehyde-3-phosphatedehydrogenase (GAPDH) as an internal control, the mRNA level was found to be markedly higher in the spleen and liver than in other organs. The correlation coefficient between protein and mRNA levels of MPD was 0.847, indicating that the protein level of MPD in Wistar rat is distributed in the tissues almost entirely dependent on the mRNA level of MPD. We previously reported that the protein levels of MPD in the liver and brain of spontaneously hypertensive rats, stroke-prone (SHRSP) are reduced. Thus, we compared mRNA levels of MPD in the liver and brain between Wistar Kyoto rats (WKY) and SHRSP. The levels in liver of SHRSP were significantly decreased, but not in brain, as compared with WKY. Also, mRNA levels of sterol regulatory element binding protein-2, which is transcription factor of cholesterol, in liver of SHRSP was similar to those of WKY. These findings indicate that the reduced protein level of MPD in the liver of SHRSP is caused by a decrease in mRNA level of MPD, and that in the brain of SHRSP is caused by increased degradation of the MPD protein.

journal of health science

Comparison of the Gene Expression Levels of Mevalonate Pyrophosphate Decarboxylase between Stroke-prone Spontaneously Hhypertensive and Wistar Kyoto Rats