Startseite Reduced [14C]-methionine uptake and fecundity in Schistosoma mansoni females treated with recombinant tumor necrosis factor α in vitro
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Reduced [14C]-methionine uptake and fecundity in Schistosoma mansoni females treated with recombinant tumor necrosis factor α in vitro

  • M.A. Haseeb EMAIL logo , Raag Agrawal und Bernard Fried
Veröffentlicht/Copyright: 28. Dezember 2016
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Acta Parasitologica
Aus der Zeitschrift Acta Parasitologica Band 62 Heft 1

Abstract

Recombinant human TNFα (rhTNFα) has previously been shown to reduce fecundity in Schistosoma mansoni adult females maintained in vitro without males, and adversely affect the uptake of [14C]-tyrosine, an amino acid required for schistosome vitellogenesis. Here we report on the effect of rhTNFα on [14C]-methionine uptake in both separated and paired females, and the effect of three different preparations of rTNFα on schistosome oviposition in vitro. In the absence of rhTNFa, separated females incorporated only 30% of the [14C]-methionine incorporated by paired females in a dose and time-dependent manner, suggesting low metabolic activity of females in the absence of males. Separated females and worm-pairs were treated with increasing doses of rhTNFα for 2 or 4 hr and then incubated in RPMI 1640 containing 10% fetal calf serum (FCS) and 5 µCi ml−1[14C]-methionine for 1 hr. Separated females treated with rhTNFa for 4 hr incorporated less methionine than those treated for 2 hr. In contrast, paired females treated with rhTNFa incorporated significantly smaller amounts of [14C]-methionine in a TNFa dose-dependent but time-independent manner [2 hr (P = 0.001) or 4 hr (P = 0.027) One-Way ANOVA]. Worm-pairs maintained in RPMI 1640 containing 10% FCS and 100 ng ml−1 of any of the three rTNFa preparations laid significantly fewer eggs than the worms cultured without rTNFα(P = 0.001; Kruskal-Wallis Test). We also observed that among rTNFα-treated worm-pairs, females were sluggish and tended to separate from their male partners. These observations suggest that TNFa inhibits [14C]-methionine uptake and reduces fecundity in females paired with males. Since paired females incorporate substantially greater amounts of [14C]-methionine, the role of males in stimulating metabolic activity in females is affirmed. Reduced amino acid uptake, and possibly other nutrients, may contribute to the diminished fecundity observed in TNFa-treated females.

Keywords: Schistosoma; Schistosoma mansoni; fecundity; tumor necrosis factor α; methionine; in vitro

Acknowledgements

This investigation was supported in part by the UNDP/World Bank/WHO Special Program for Research and Training in Tropical Diseases (TDR). The PR strain of Schistosoma mansoni was provided by Dr. F. Lewis (Biomedical Research Institute, Rockville, MD). MAH conceived the study, RA and BF helped in literature searches and interpretation of data. The authors contributed equally to writing of the manuscript. We gratefully acknowledge the review of this manuscript and substantive suggestions by Adi Reddy, M.D., and technical assistance by Ms. Anna Ludwikowska and Mr. Jack Preis.

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Received: 2016-6-7
Revised: 2016-10-10
Accepted: 2016-10-14
Published Online: 2016-12-28
Published in Print: 2017-3-1

© 2017 W. Stefański Institute of Parasitology, PAS

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https://doi.org/10.1515/ap-2017-0019
Schlagwörter für diesen Artikel
Schistosoma; Schistosoma mansoni; fecundity; tumor necrosis factor α; methionine; in vitro

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