Myosin heavy chain mRNA transform to faster isoforms in immobilized skeletal muscle: A quantitative PCR study

被引:50
作者
Jankala, H [1 ]
Harjola, VP [1 ]
Petersen, NE [1 ]
Harkonen, M [1 ]
机构
[1] UNIV HELSINKI, DEPT CLIN CHEM, SF-00290 HELSINKI, FINLAND
关键词
immobilization; number of myosin heavy chain mRNA molecules; quantitative reverse transcription-polymerase chain reaction;
D O I
10.1152/jappl.1997.82.3.977
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
A quantitative polymerase chain reaction (PCR) method was used to measure the quantities of type I, IIa, IIx, and IIb myosin heavy chain (MHC) mRNA in total RNA preparations of the soleus, gastrocnemius, and plantaris muscles of normal and hindlimb-immobilized rats. Type IIx and even type IIb MHC mRNA were demonstrated at extremely low levels in normal soleus, 2.1 +/- 0.4 X 10(5) and 5.0 +/- 0.2 X 10(5) molecules of mRNA per microgram total RNA, respectively. Immobilization for 1 wk significantly altered the gene expression of MHC isoforms. In soleus, both type IIx and IIb MHC genes became significantly upregulated, 24-fold (P < 0.005) and 2.6-fold (P < 0.05), respectively. In gastrocnemius, the level of type IIa MHC mRNA decreased by 51% (P < 0.01) and the level of type IIx MHC mRNA increased by 140% (P < 0.05). In plantaris, the level of type IIa MHC mRNA decreased by 58% (P < 0.005). In conclusion, immobilization changed the MHC mRNA profile in three different types of skeletal muscle toward faster isoforms. The quantitative results permit reliable evaluation of changes in mRNA levels.
引用
收藏
页码:977 / 982
页数:6
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