Quantitation of tyrosine hydroxylase, protein levels: Spot immunolabeling with an affinity-purified antibody

Journal Article · Fri Sep 01 00:00:00 EDT 1989 · Analytical Biochemistry; (USA)

DOI:https://doi.org/10.1016/0003-2697(89)90240-6· OSTI ID:5026906

Haycock, J W ^[1]

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1. Louisiana State Univ. Medical Center, New Orleans (USA)

Tyrosine hydroxylase was purified from bovine adrenal chromaffin cells and rat pheochromocytoma using a rapid (less than 2 days) procedure performed at room temperature. Rabbits were immunized with purified enzyme that was denatured with sodium dodecylsulfate, and antibodies to tyrosine hydroxylase were affinity-purified from immune sera. A Western blot procedure using the affinity-purified antibodies and {sup 125}I-protein A demonstrated a selective labeling of a single Mr approximately 62,000 band in samples from a number of different tissues. The relative lack of background {sup 125}I-protein A binding permitted the development of a quantitative spot immunolabeling procedure for tyrosine hydroxylase protein. The sensitivity of the assay is 1-2 ng of enzyme. Essentially identical standard curves were obtained with tyrosine hydroxylase purified from rat pheochromocytoma, rat corpus striatum, and bovine adrenal medulla. An extract of PC 12 cells (clonal rat pheochromocytoma cells) was calibrated against purified rat pheochromocytoma tyrosine hydroxylase and used as an external standard against which levels of tyrosine hydroxylase in PC12 cells and other tissue were quantified. With this procedure, qualitative assessment of tyrosine hydroxylase protein levels can be obtained in a few hours and quantitative assessment can be obtained in less than a day.

• OSTI ID: 5026906
• Journal Information: Analytical Biochemistry; (USA), Vol. 181:2; ISSN 0003-2697
• Country of Publication: United States
• Language: English

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