Glycobiology Advance Access published online on April 2, 2003
Glycobiology, doi:10.1093/glycob/cwg066
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© 2003 Oxford University Press
ORIGINAL ARTICLES
1 Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Elm and Carlton Streets, Buffalo, NY 14263 The synthesis of the common and well-documented Sia We have generated a mouse specifically unable to utilize the transcriptional initiation site uniquely utilized in P1-mediated ST6Gal I expression. These animals, Siat1
Revised on March 5, 2003
Accepted on March 5, 2003
Biologic contribution of P1 promoter mediated expression of ST6Gal I sialyltransferase
2 Department of Molecular and Cellular Biophysics, Roswell Park Cancer Institute
2,6 to Gal
1,4GlcNAc structure (Sia6LacNAc), is principally mediated by the sialyltransferase ST6Gal I, which is particularly highly expressed in liver, lactating mammary gland, intestinal epithelia of newborn animals, and in B cells. Multiple, independent promoters govern the expression of Siat1, the ST6Gal I gene. In liver, elevation of hepatic and serum ST6Gal is part of the acute phase reaction, the hepatic response to systemic trauma, and is governed by the inducible, liver-specific promoter-regulatory region, P1. A constitutive and non-tissue specific promoter, P3, mediates low level, basal hepatic Siat1 transcription.
P1, are viable and display reduced ST6Gal I mRNA in liver with concomitantly reduced sialyltransferase activities in liver and in serum. Siat1
P1 animals are unable to elevate hepatic Siat1 mRNA as part of the inflammatory response induced by turpentine. Surprisingly, serum glycoprotein components exhibit normal extent of sialylation, with no noticeable difference in binding to SNA, the
2,6-sialyl-specific lectin. Siat1
P1 animals also exhibit an outwardly normal B cell response. Upon intraperitoneal challenge with the pathogen Salmonella typhimurium, a significantly greater accumulation of neutrophils within the peritoneal space was observed in Siat1
P1 animals compared to wild-type mice. Siat1
P1 mice also exhibit a greater bacterial burden in liver and spleen, accompanied by more pronounced spleno-hepatomegaly and greater leukocyte infiltration into affected organs than their wild-type counterparts.![]()
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