Influence of zinc on growth, somatomedin, and glycosaminoglycan metabolism in rats
Weanling male rats were fed control ad libitum, zinc-deficient (ZD, 1 ppm zinc) or pair-fed (PF) control diets for 13 days. Rats subsequently were refed control diets for up to 8 days and serially killed. ZD and PF diets significantly decreased growth rate, feed intake, and feed efficiency compared to controls. Body weight and feed efficiency, but not feed intake, were significantly less in ZD compared to PF. Bone zinc was 315, 286, and 109 ..mu..g/g for control, PF, and ZD at the end of depletion. /sup 35/SO/sub 4/ uptake by glycosaminoglycans (GAG) was significantly less in ZD compared to either control ad libitum or PF rats. Xylosyltransferase activity was decreased significantly below PF and control by ZD, suggesting depressed enzyme activity and/or decreased GAG acceptor sites. Bioassayable somatomedin (Sm) activity was 0.81, 0.42 and 0.33 +/- 0.09 relative activity for control, PF and ZD at the end of depletion. Sm was statistically less in ZD compared to PF at day 2 and 5 of refeeding, but not at the end of depletion. Sm activity and GAG metabolism returned to normal after refeeding for 2-5 days in PF and for 5-8 days in ZD rats. Serum insulin but not glucose was significantly depressed by ZD and PF diets. Thus, zinc deficiency depressed growth and cartilage metabolism and was associated with decreased Sm activity and insulin levels. Some of these changes could be attributed to decreased feed intake as a result of ZD.
- Research Organization:
- Kansas State Univ., Manhattan
- OSTI ID:
- 6406936
- Journal Information:
- Am. J. Physiol.; (United States), Vol. 252:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
SULFATES
UPTAKE
SULFUR 35
ZINC COMPOUNDS
BIOLOGICAL EFFECTS
ANIMAL GROWTH
GLYCOSYL TRANSFERASES
METABOLISM
NUTRITIONAL DEFICIENCY
STH
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
DAYS LIVING RADIOISOTOPES
ENZYMES
EVEN-ODD NUCLEI
GROWTH
HORMONES
ISOTOPES
LIGHT NUCLEI
NUCLEI
OXYGEN COMPOUNDS
PEPTIDE HORMONES
PITUITARY HORMONES
RADIOISOTOPES
SULFUR COMPOUNDS
SULFUR ISOTOPES
TRANSFERASES
560300* - Chemicals Metabolism & Toxicology
550201 - Biochemistry- Tracer Techniques