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Sera from Pigs Infected with Sarcocystis Suicanis and Cachectin Decrease Preadipocyte Differentiation in Primary Cell Culture

University of Georgia, Athens 30602 and U.S. Department of Agriculture, Athens, GA 30613

Abstract

The macrophage-secreted hormone cachectin depressed lipoprotein lipase activity and lipogenic enzymes in adipose cells. Cachectin reduced differentiation of preadipocytes in cultures of stromal-vascular cells from rat adipose tissue. Differentiation was measured by two methods of estimating lipid accumulation. Adipocytes were separated from the stromal-vascular cells by centrifugation and staining (oil red 0) for intracellular lipid. Lipolytic activity was measured by using esterase histochemistry. Sera from pigs that were infected with Sarcocystis suicanis showed cachectin-like activity compared with sera collected from the same animals before infection. Cachectin and sera collected from infected animals specifically decreased fat cell number without decreasing the stromal-vascular cell number.

¹ Dept. of Foods and Nutr.

² Coll. of Vet. Med.

³ ARS, Richard B. Russell Res. Center.

⁴ Current Address: Purina Mills Inc., 1401 S. Hanley Road, St. Louis, MO 63166.