Summary
A specific method for in situ-hybridization of slow myosin heavy chain MHCI (β-cardiac MHC) mRNA was established with the use of a nonradioactively labeled cRNA probe. The digoxigenin-labeled probe was the T7-RNA polymerase transcript from a 350 bp SacI fragment of a rabbit β-cardiac MHC cDNA. Northern blot analyses of RNA preparations from skeletal and cardiac muscles with homologous and complementary RNA proved the specificity of the hybridization. The in situ-hybridization was applied for studying the distribution of MHCI mRNA in normal fast- and slow-twitch muscles, as well as in muscles undergoing fast-to-slow transformation by chronic low-frequency stimulation. The majority of soleus muscle fibers was intensely stained, whereas fast-twitch muscles contained only a few positive fibers. The intracellular distribution of the hybridization product showed a clear relationship to the nuclei with intense staining of the perinuclear regions within the subsarcolemmal space. The more intensely stained fibers of transforming muscle displayed hybridization product also within the nuclei. As revealed by inspection of longitudinal sections at high magnification and polarized light, MHCI mRNA was also detectable in the myofibrils in a cross-striational pattern resulting from staining of the I-bands.
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Aigner, S., Pette, D. In situ hybridization of slow myosin heavy chain mRNA in normal and transforming rabbit muscles with the use of a nonradioactively labeled cRNA. Histochemistry 95, 11–18 (1990). https://doi.org/10.1007/BF00737222
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DOI: https://doi.org/10.1007/BF00737222