J. Anim Sci.
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J. Anim Sci. 1984. 58:1540-1549.
© 1984 American Society of Animal Science
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Histochemical and Cellular Aspects of Adipose Tissue Development in Decapitated Pig Fetuses: An Ontogeny Study

G. J. Hausman and G. B. Thomas1

US Department of Agriculture,2, Athens, GA 30613

Abstract

Adipose tissue from fetuses decapitated at 45 d of gestation was removed and structurally and histochemically analyzed at 65, 85 and 110 d of gestation. Subcutaneous adipose tissue from decapitated and control fetuses at 65 d of gestation was histologically and histochemically similar. A reduced number of fat cell clusters in the outer layer of subcutaneous tissue and a poorly developed dermis was evident in decapitated fetuses at 85 d of gestation. Fat cell size was similar for control and decapitated fetuses at 65 d of gestation, whereas cells in 85-d-old decapitated fetuses were larger than cells in control fetuses. Adipocytes from control and 85-d-old decapitated fetuses were histochemically similar except for an elevated number of esterase positive cells in decapitated fetuses. At 110 d of gestation, adipocytes from decapitated fetuses had higher activities of the following enzymes than did control adpocytes: malate dehydrogenase (NADP dependent), glucose 6-phosphate dehydrogenase (NADP dependent), isocitrate dehydrogenase (NADP dependent), a-glycerol phosphate dehydrogenase (NAD dependent), NADPH-tetrazoleum reductase and esterase. Levels of succinate dehydrogenase, glutamate dehydrogenase and NADH-tetrazoleum reductase were similar in cells from controls and decapitate fetuses. These data indicate that fetal decapitation probably exerts a positive influence on enzymes involved in lipid synthesis. However, fetal decapitation also exerts a negative influence on fat cell hyperplasia.

Footnotes

1 The authors thank Dr. R. W. Seerley, Dept. of Anim. Sci., Univ. of Georgia, for providing animal facilities and for maintaining the animals used in this study.

2 Richard B. Russell Agr. Res. Center, ARS, P.O. Box 5677.






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Copyright © 1984 by the American Society of Animal Science.