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Clinical Chemistry 39: 448-452, 1993;
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Clinical Chemistry, Vol 39, 448-452, Copyright © 1993 by American Association for Clinical Chemistry

Measurement of deoxyribonuclease I activity in human tissues and body fluids by a single radial enzyme-diffusion method

D Nadano, T Yasuda and K Kishi
Department of Legal Medicine, Fukui Medical School, Japan.

In the single radial enzyme-diffusion (SRED) method for assay of deoxyribonuclease I, a precisely measured volume of the enzyme solution is dispensed into a circular well in an agarose gel layer in which DNA and ethidium bromide are uniformly distributed. A circular dark zone is formed as the enzyme diffuses from the well radially into the gel and digests substrate DNA. The diameter of the dark circle of hydrolyzed DNA increases in size with time and correlates linearly with the amount of enzyme applied to the well. Thus, the SRED can be used for quantitation of deoxyribonuclease I with a limit of detection of 2 x 10(-6) unit. This corresponds to 1 pg of purified urine deoxyribonuclease I. We measured the deoxyribonuclease I activity of 17 different human tissues and body fluids from healthy donors. Urine samples showed the greatest activity, 6.0 +/- 2.2 kilo-units/g protein (mean +/- SD). Serum deoxyribonuclease I activity was 4.4 +/- 1.8 units/L.


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