is a Gram-negative diplococcus and an
obligate human pathogen. Different research groups have
been focused on the identification of meningococcus B
antigens as the basis of a new vaccine. However, the high
genetic variability of the proteins among different serotype
B strains represents a challenge to obtain a broad multivalent
effective N. meningitidis serotype B vaccine (Serruto
et al. 2012). A vaccine based on OMVs of N. meningitidis
is currently the only licensed vaccine against meningococcus
serogroup B, and these have been used in Cuba,
Chile, Norway, and New Zealand (Boslego et al. 1995; Fredriksen
et al. 1991; Holst et al. 2009; Sierra et al. 1991).
However, those vaccines required extraction with a detergent
(deoxycholate) to decrease the amount of toxic LPS,
resulting in partially intact and aggregated vesicles with
an altered composition (Ferrari et al. 2006). There are two
types of detergent-free OMVs. The first type is spontaneously
released OMVs during in vitro growth and is without
any treatments to enhance vesiculation (Ellis et al. 2010).
The second type is obtained by treating cells with ethylene
diamine tetraacetic acid (EDTA) to chelate calcium and
magnesium ions (van de Waterbeemd et al. 2012).
is a Gram-negative diplococcus and an
obligate human pathogen. Different research groups have
been focused on the identification of meningococcus B
antigens as the basis of a new vaccine. However, the high
genetic variability of the proteins among different serotype
B strains represents a challenge to obtain a broad multivalent
effective N. meningitidis serotype B vaccine (Serruto
et al. 2012). A vaccine based on OMVs of N. meningitidis
is currently the only licensed vaccine against meningococcus
serogroup B, and these have been used in Cuba,
Chile, Norway, and New Zealand (Boslego et al. 1995; Fredriksen
et al. 1991; Holst et al. 2009; Sierra et al. 1991).
However, those vaccines required extraction with a detergent
(deoxycholate) to decrease the amount of toxic LPS,
resulting in partially intact and aggregated vesicles with
an altered composition (Ferrari et al. 2006). There are two
types of detergent-free OMVs. The first type is spontaneously
released OMVs during in vitro growth and is without
any treatments to enhance vesiculation (Ellis et al. 2010).
The second type is obtained by treating cells with ethylene
diamine tetraacetic acid (EDTA) to chelate calcium and
magnesium ions (van de Waterbeemd et al. 2012).
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