AJP - Regu AJP: Regulatory, Integrative and Comparative Physiology
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Am J Physiol Regul Integr Comp Physiol 264: R931-R937, 1993;
0363-6119/93 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 264, Issue 5 931-R937, Copyright © 1993 by American Physiological Society

ARTICLES

Modulation of tissue-type plasminogen activator by retinoids in rat plasma and tissues

A. M. Van Bennekum, J. J. Emeis, T. Kooistra and H. F. Hendriks
Institute of Ageing and Vascular Research, Gaubius Laboratory, Leiden, The Netherlands.

In this study the effect of vitamin A status and retinoid treatment on the activity of tissue-type plasminogen activator (TPA) and its inhibitor, plasminogen activator inhibitor-type 1 (PAI-1), in plasma and in several tissues was investigated in BN/BiRij rats. Hypervitaminosis A and retinoic acid treatment increased plasma TPA activity by approximately 50%, but PAI-1 activity was not affected. The effect of retinyl palmitate treatment on plasma TPA activity was already significant after 5 days and continued for at least up to 8 wk. Isotretinoin treatment affected neither plasma TPA nor PAI-1 activity. In plasma of vitamin A-deficient rats, TPA activity was decreased by a factor of three, whereas PAI-1 activity was increased twofold. Modulation of plasma TPA activity by vitamin A status and retinoic acid treatment was associated with similar changes in tissue TPA activity. This suggests that the changes in plasma TPA activities might be the result of changes in tissue TPA synthesis.


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