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Tissue-Specific expression of rat kininogen mRNAs.

To characterize the local kallikrein-kinin system, tissue distribution of mRNAs for kininogens, precursor proteins of kinins, such as high-molecular-weight (H-), low-molecular-weight (L-) and T-kininogens, were studied in the rat by means of reverse-transcription polymerase chain reaction (RT-PCR) using a fluorophore Cy5-labeled 5'-primer. High levels of these three kininogen mRNAs were present in the liver. Relatively high levels of H-kininogen mRNA were also detected in the skin, lung, kidney, and testis in a descending order, whereas L-kininogen mRNA was detectable in the lung and brain, but not in the kidney, skin, testis, heart, adrenal gland, or skeletal muscle. T-Kininogen mRNA was present in these tissues, except for skeletal muscle. These findings suggest that the expression of each kininogen mRNA is regulated by the tissue-dependent mechanisms which is closely associated with functions of the kallikrein-kinin system in the tissue.