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Am J Physiol 197: 1021-1027, 1959;
0002-9513/59 $5.00
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Physiological disposition of d- and l-thyroxine in the rat

D. F. Tapley 1, F. F. Davidoff 1, W. B. Hatfield 1, and J. E. Ross 1

1 Department of Medicine, Columbia University College of Physicians and Surgeons, and Presbyterian Hospital, New York City

A comparison was made of the distribution and excretion of the optical isomers of thyroxine in the rat. d-Thyroxine disappeared more rapidly from the blood and was concentrated to a greater extent in the liver and kidney than was l-thyroxine. The concentration of d-thyroxine in such peripheral tissues as muscle, brain and skin was much less than the concentration of l-thyroxine. This difference in distribution to the peripheral tissues was of such magnitude as to suggest a possible basis for the different activities of the two isomers observed in vivo. The half-time of d-thyroxine in the body (14 hr.) was significantly shorter than that of l-thyroxine (42 hr.).

Submitted on May 1, 1959




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