Abstract
The examination was performed whether aquaporin (AQP) 9 is expressed in normal skeletal muscle at mRNA and protein levels. Gel electrophoresis of the reverse transcription-polymerase chain reaction (RT-PCR) product of total RNA samples of human normal muscles by oligonucleotide primers for human AQP9 showed a band of 221 basepairs, which corresponded to the basepair length between two primers of AQP9. The nucleotide sequence of RT-PCR product coincided with that of human AQP9. Immunoblot analysis revealed that the rabbit and sheep antibodies against the synthetic peptide of the C-terminal cytoplasmic domain of human AQP9 molecule reacted with a protein of approximately 30 kDa molecular weight in extracts of human normal skeletal muscles. Immunohistochemistry with our anti-AQP9 antibodies showed an immunoreaction at the myofiber surface of both type 1 and type 2 fibers with almost equal staining intensity in human skeletal muscles. The implication of AQP9 expression in skeletal myofibers was discussed.
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