Four Forms of Tyrosine Hydroxylase Are Present in Human Adrenal Medulla

Authors

  • John W. Haycock

    Corresponding author
    1. Department of Biochemistry and Molecular Biology, Louisiana State University Medical Center, New Orleans, Louisiana, U.S.A.
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Address correspondence and reprint requests to Dr. J. W. Haycock at Department of Biochemistry and Molecular Biology, Louisiana State University Medical Center, 1100 Florida Avenue, New Orleans, LA 70119, U.S.A.

Abstract

Abstract: Alternative splicing can result in up to four forms of human tyrosine hydroxylase (HTH) mRNA (mRNAHTH). In the adrenal gland, a major site of catecholamine biosynthesis, the presence of all four mRNAHTH forms is controversial. In the present study, postmortem human adrenal medullary tissue was analyzed for the presence of multiple forms of HTH protein by blot immunolabeling. Electrophoretic transfers were developed with affinity-purified rabbit anti-HTH antibodies raised against peptides that reproduced the unique amino acid sequences predicted by the four mRNAHTH forms. All four of the predicted HTH protein forms were present in the adrenal glands from a diverse sample population.

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