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2014 ; 21
(12
): 1605-12
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Determination of specific antibody responses to the six species of ebola and
Marburg viruses by multiplexed protein microarrays
#MMPMID25230936
Kamata T
; Natesan M
; Warfield K
; Aman MJ
; Ulrich RG
Clin Vaccine Immunol
2014[Dec]; 21
(12
): 1605-12
PMID25230936
show ga
Infectious hemorrhagic fevers caused by the Marburg and Ebola filoviruses result
in human mortality rates of up to 90%, and there are no effective vaccines or
therapeutics available for clinical use. The highly infectious and lethal nature
of these viruses highlights the need for reliable and sensitive diagnostic
methods. We assembled a protein microarray displaying nucleoprotein (NP), virion
protein 40 (VP40), and glycoprotein (GP) antigens from isolates representing the
six species of filoviruses for use as a surveillance and diagnostic platform.
Using the microarrays, we examined serum antibody responses of rhesus macaques
vaccinated with trivalent (GP, NP, and VP40) virus-like particles (VLP) prior to
infection with the Marburg virus (MARV) (i.e., Marburg marburgvirus) or the Zaire
virus (ZEBOV) (i.e., Zaire ebolavirus). The microarray-based assay detected a
significant increase in antigen-specific IgG resulting from immunization, while a
greater level of antibody responses resulted from challenge of the vaccinated
animals with ZEBOV or MARV. Further, while antibody cross-reactivities were
observed among NPs and VP40s of Ebola viruses, antibody recognition of GPs was
very specific. The performance of mucin-like domain fragments of GP (GP mucin)
expressed in Escherichia coli was compared to that of GP ectodomains produced in
eukaryotic cells. Based on results with ZEBOV and MARV proteins, antibody
recognition of GP mucins that were deficient in posttranslational modifications
was comparable to that of the eukaryotic cell-expressed GP ectodomains in assay
performance. We conclude that the described protein microarray may translate into
a sensitive assay for diagnosis and serological surveillance of infections caused
by multiple species of filoviruses.