SIMULTANEOUS QUANTIFICATION OF APP AND TAU mRNA BY RT-PCR
GU Yong Jun (Department of Neurobiology and State Key Laboratory of Medical Neurobiology, Shanghai Medical University,Shanghai 200032,China) Fumitaka Oyama, Yasuo Ihara (Department of Neuropathology,Institute for Brain Research,Faculty of Medicine, University of Tokyo, 7-3-1Hongo,Bunkyo-Ku,Tokyo 113, Japan)
We describe here a method for simultaneous relative quantitation of APP and tau expressions in rat muscle using polymerase chain reaction combined with reverse transcription. The target mRNAs were coamplified with an internal control, glyceraldehyde-3-phosphate dehydrogenase (G,PD). The amplified products were measured with a laser image analyzer,and the values were plotted against the cycle number. In the exponential phase of amplification, the linearity and re-producibility of RT-PCR demonstrate identical efficiencies of cDNA synthesis and PCR amplification for APP,tau and G3PD. These results suggest that in the exponential phase of amplification, a relative quantitation of target mRNAs could he accomplished by normalization with internal control. Preliminary experiments indicate that the expressions of both APP and tau in rat muscle were first increased and then decreased by chronic intoxication with chloroquine.