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Am J Physiol Endocrinol Metab 269: E1017-E1023, 1995;
0193-1849/95 $5.00
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AJP - Endocrinology and Metabolism, Vol 269, Issue 6 E1017-E1023, Copyright © 1995 by American Physiological Society

ARTICLES

Comparative metabolism of plasminogen glycoforms I and II in the alloxan-diabetic rabbit

M. W. Hatton, S. M. Southward, B. Ross-Ouellet, M. Richardson and P. D. Winocour
Department of Pathology, McMaster University Health Sciences Centre, Hamilton, Ontario, Canada.

The metabolism of plasminogen glycoforms I and II was measured in alloxan-induced diabetic and in age-matched control rabbits. Radiolabeled plasminogen I and II were degraded significantly more slowly in diabetic compared with control rabbits; plasminogen II [half-time (T1/2), 1.31 days] was degraded faster than plasminogen I (T1/2), 1.86 days) in diabetic rabbits and in control rabbits (T1/2, 1.18 and 1.58 days, respectively). From the catabolic rates and relative quantities in plasma, we calculated that approximately four molecules of plasminogen II were degraded for one molecule of plasminogen I in the diabetic and control rabbits. To verify this later observation, plasminogen I and II production by diabetic rabbit livers was compared with that by the control livers in vitro. During perfusion with [3H]leucine, 3H-labeled protein was released more slowly from diabetic than from control livers, but no quantitative difference in total plasminogen yield between diabetic and control livers was found. Nevertheless, plasminogen II was produced 0.7 +/- 0.4 and 4.3 +/- 0.3 times faster than plasminogen I by diabetic and control livers, respectively. Plasminogen metabolism in the diabetic rabbit did not differ qualitatively from that in the control rabbit except that catabolism was slowed.


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