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. 1992 Aug;60(8):3209–3216. doi: 10.1128/iai.60.8.3209-3216.1992

Utilization of fractionated soluble egg antigens reveals selectively modulated granulomatous and lymphokine responses during murine schistosomiasis mansoni.

N W Lukacs 1, D L Boros 1
PMCID: PMC257303  PMID: 1639491

Abstract

Worm eggs deposited in the livers and intestines of Schistosoma mansoni-infected mice secrete soluble egg antigens (SEA) and induce T cell-mediated circumoval granulomas. In the present study, we fractionated crude SEA by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and tested the fractions for granuloma elicitation and lymphokine production at different stages of the infection. SEA fraction-coupled beads were used to elicit artificial pulmonary granulomas. Acutely infected mice responded with granulomas to seven fractions (less than 21-, 25- to 30-, 32- to 38-, 60- to 66-, 70- to 90-, 93- to 125-, and greater than 200-kDa fractions) of SEA, whereas chronically infected mice responded to four fractions (60- to 66-, 70- to 90-, 93- to 125-, and greater than 200-kDa fractions). In response to both crude and fractionated SEA, granuloma T cells produced high levels of gamma interferon at the preacute (6-week) stage of infection, but production subsequently diminished. Interleukin-2 (IL-2) and IL-4 production peaked at the acute (8-week) stage of infection and concurrently decreased at the chronic (20-week) stage. At the acute stage of the infection, the granulomagenic SEA fractions also elicited IL-2 and IL-4 production; at the chronic stage, IL-2 production and, to a lesser degree, IL-4 production corresponded to SEA fractions that elicited granulomas. Isolated SEA proteins from the 32- to 38-kDa fraction demonstrated differential lymphokine responses: predominant gamma interferon and IL-2 production was elicited by the 32-kDa fraction, whereas the 35- and 38-kDa proteins elicited predominant gamma interferon and IL-4 production. However, all three proteins elicited granuloma formation. The present study reveals changes in granulomatous responses to SEA fractions during the acute and chronic stages of the infection as well as distinct phases of gamma interferon, IL-2, and IL-4 lymphokine production throughout the infection. Based on these results, it is concluded that granuloma formation and IL-2 and IL-4 production are interrelated.

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Selected References

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