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J Appl Physiol 73: 142S-147S, 1992;
8750-7587/92 $5.00
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Journal of Applied Physiology, Vol 73, Issue 2 142S-147S, Copyright © 1992 by American Physiological Society

ARTICLES

Differences in glycogen, lipids, and enzymes in livers from rats flown on COSMOS 2044

A. H. Merrill Jr, E. Wang, R. LaRocque, R. E. Mullins, E. T. Morgan, J. L. Hargrove, H. L. Bonkovsky and I. A. Popova
Department of Biochemistry, Emory University School of Medicine, Atlanta 30322.

Livers from rats flown aboard COSMOS 2044 were analyzed for protein, carbohydrate (glycogen), and lipids as well as the activities of a number of key enzymes involved in metabolism of these compounds and xenobiotics. The major differences between the flight group and the synchronous control were elevations in microsomal protein, liver glycogen content, tyrosine aminotransferase, and tryptophan oxygenase and reductions in sphingolipids and the rate-limiting enzyme of heme biosynthesis, delta-aminolevulinic acid synthase. These results provide further evidence that spaceflight has pronounced and diverse effects on liver function; however, some of the results with samples from COSMOS 2044 differed notably from those from previous spaceflights. This may be due to conditions of spaceflight and/or the postflight recovery period for COSMOS 2044.


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