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J Virol, June 1998, p. 4650-4656, Vol. 72, No. 6
Department of Pathology, University of
Massachusetts Medical Center, Worcester, Massachusetts
01655,1 and
Department of Molecular
Development, Alexion Pharmaceuticals, Inc., New Haven, Connecticut
065112
Received 17 November 1997/Accepted 23 February 1998
Human sera contain high levels of natural antibody (Ab) to
Gal
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Evaluation of the Gal
1-3Gal Epitope as a Host
Modification Factor Eliciting Natural Humoral Immunity to
Enveloped Viruses
1-3Gal, a terminal glycosidic structure expressed on the surface of cells of mammals other than Old World primates. Incorporation of
this determinant onto retroviral membranes by passage of viruses in
cells encoding
-1-3-galactosyltransferase (GT) renders retroviruses sensitive to lysis by natural Ab and complement in normal human serum
(NHS). Plasma membrane-budding viruses representing four additional
virus groups were examined for their sensitivities to serum
inactivation after passage through human cell lines that lack a
functional GT or human cells expressing recombinant porcine GT. The
inactivation of lymphocytic choriomeningitis virus (LCMV) by NHS
directly correlated with host modification of the virus via expression
of Gal
1-3Gal and was blocked by incorporation of soluble
Gal
1-3Gal disaccharide into the inactivation assay. GT-deficient
mice immunized to make high levels of Ab to Gal
1-3Gal (anti-Gal Ab)
were tested for resistance to LCMV passaged in GT-expressing cells.
Resistance was not observed, but in vitro analyses of the mouse immune
sera revealed that the antiviral activity of the sera was insufficient
to eliminate LCMV infectivity on its natural targets of infection,
macrophages, which express receptors for Ab and complement. Newcastle
disease virus and vesicular stomatitis virus (VSV) were inactivated by
NHS regardless of cell passage history, whereas Sindbis virus (SV)
passaged in human cells resisted inactivation. Both VSV and SV passaged
in Gal
1-3Gal-expressing human cells incorporated this sugar moiety
onto their major envelope glycoproteins. SV passaged in mouse cells
expressing Gal
1-3Gal was moderately sensitive to inactivation by
NHS. These results indicate that enveloped viruses expressing
Gal
1-3Gal differ in their sensitivities to NHS and that a potent
complement source, such as that in NHS, is required for efficient
inactivation of sensitive viruses in vitro and in vivo.
*
Corresponding author. Mailing address: Department of
Pathology, University of Massachusetts Medical Center, 55 Lake Ave.
North, Worcester, MA 01655. Phone: (508) 856-5819. Fax: (508) 856-5780. E-mail: rwelsh{at}bangate.ummed.edu.
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