Identification of Transient Glycosylation Alterations of Sialylated Mucin Oligosaccharides During Infection by the Rat Intestinal Parasite Nippostrongylus Brasiliensis
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The sialylation of the oligosaccharides from small-intestinal mucins during a 13-day infectious cycle was studied in Sprague-Dawley rats with the parasite Nippostrongylus brasiliensis. Sialic acid analysis and release, permethylation and analysis by GC-MS of the sialylated oligosaccharides isolated from the 'insoluble' mucin complex revealed a relative decrease (4-7-fold) of N-glycolylneuraminic acid compared with N-acetylneuraminic acid just before parasite expulsion. Northern blots showed that this effect was due to the decreased expression of a hydroxylase converting CMP-N-acetylneuraminic acid into CMP-N-glycolylneuraminic acid. Analysis of other rat strains showed that this parasite infection also caused the same effect in these animals. Detailed analysis of infected Sprague-Dawley rats revealed four sialylated oligosaccharides not found in the uninfected animals. These new oligosaccharides were characterized in detail and all shown to contain the trisaccharide epitope NeuAc/NeuGcalpha2-3(GalNAcbeta1-4)Galbeta1 (where NeuGc is N-glycolyl neuraminic acid). This epitope is similar to the Sd(a)- and Cad-type blood-group antigens and suggests that the infection causes the induction of a GalNAcbeta1-4 glycosyltransferase. This model for an intestinal infection suggests that the glycosylation of intestinal mucins is a dynamic process being modulated by the expression of specific enzymes during an infection process.
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Fu Q, Li G, Wang C, Wang Y, Li Q, Hao J Molecules. 2019; 24(7).
PMID: 30959980 PMC: 6480446. DOI: 10.3390/molecules24071365.
Song K, Kwak C, Chung T, Ha S, Park J, Ha K Sci Rep. 2019; 9(1):4292.
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Sharpe C, Thornton D, Grencis R Parasite Immunol. 2018; 40(4):e12517.
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