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. 1984 Nov;46(2):544–551. doi: 10.1128/iai.46.2.544-551.1984

Inhibition of phagocytosis and chemiluminescence in human leukocytes by a lipid soluble factor in normal tissues.

T S Huang, R E Hurd, I J Chopra, P Stevens, D H Solomon, L S Young
PMCID: PMC261569  PMID: 6389349

Abstract

Homogenates of normal rat tissues inhibited several functional parameters of normal human peripheral blood leukocytes, including luminol-dependent chemiluminescence induced by both soluble (phorbol myristate acetate) and particulate (Escherichia coli) stimuli; in vitro uptake of radiolabeled E. coli; and in vitro phagocytosis and killing of E. coli. The doses of rat tissue protein that caused a 50% inhibition of leukocyte chemiluminescence were ca. 6.2 micrograms for small intestine, 83 micrograms for kidney; 100 micrograms for heart; 132 micrograms for liver, 190 micrograms for skeletal muscle, and 307 micrograms for brain. The putative phagocytosis inhibitor (PI) in rat liver was more plentiful in particulate fractions than in the cytosol. The PI activity in the original or Miranol-solubilized rat liver homogenate was nondialyzable, and it was reduced substantially by heating at 90 degrees C for 30 min but not at 56 degrees C for 30 min. It was unaffected by aprotinin, a potent inhibitor of proteolytic activity. Treatment of tissues with trypsin did not reduce PI activity, whereas treatment with phospholipase A2 clearly increased it. The bulk (up to 88%) of PI in rat liver or small intestine could be extracted by lipid solvents, e.g., diethyl ether. Purified fatty acids were potent inhibitors of leukocyte chemiluminescence; other lipids had little or no inhibiting activity. The various data suggest that (i) normal tissues contain a potent PI and (ii) that the PI is a lipid moiety.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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