INVESTIGADORES
LONGHI Silvia Andrea
congresos y reuniones científicas
Título:
Analysis of Recombinant Antibody Libraries from Patients with Chronic Chagas Heart Disease and Selection of Human Recombinant Antibodies against Trypanosoma cruzi Ribosomal P Proteins
Autor/es:
V. GRIPPO, M. EVELINA, K. GOMEZ, C. SCHMULSKI, V. LABOVSKY, G. LEVY, S. LONGHI, M.J. LEVIN
Lugar:
Mérida, México
Reunión:
Congreso; HHMI Meeting of International Research Scholars.; 2005
Institución organizadora:
Howard Hughes Medical Institute
Resumen:
Patients with chronic Chagas heart disease
(cChHD), the severest form of the human chronic
infection by Trypanosoma cruzi, have circulating
antibodies that may be involved in the pathogenesis
of cardiac dysfunction. To better understand this
antibody repertoire, we constructed two combinatorial
libraries, an Fab (1 108 cfu/microgram)
and an scFv (1 109 cfu/microgram) library. The
variable regions of these antibodies were compared
with the variable regions of antibodies obtained
from single plasma cells. The phage libraries were
panned against whole T. cruzi homogenates and
recombinant T. cruzi ribosomal P proteins. Several
methods, both classical and original, were used to
screen for specific Fab- and scFv-bearing phages.
AntiT. cruzi and anti-P antibodies were obtained
that reacted with different T. cruzi proteins and
with the C-terminal ends of the ribosomal P proteins.
Furthermore, the repertoire and distribution
of 148 rearranged VH genes were analyzed and
compared with available data of repertoires derived
from healthy individuals, patients with autoimmune
diseases, and patients with other infections.
Preliminary results show that the VH family
usage in the unselected libraries has an overrepresentation
of VH5 family and underrepresentation
of VH3-23related germline genes. Amongst the
antiT. cruzi clones, a VH4 overrepresentation was
evident, contributed by VH4-59 and VH4-
39related genes. By contrast, plasma cells from
cardiac inflammatory sites showed a preference for
the VH1 family. The composition of CDR3 regions
from the antibodies of the phage libraries and those
derived from plasma cells were different, pointing
to a higher degree of affinity maturation among the
latter, a finding that was confirmed by analysis of
the somatic mutations.
The characterization of anti-P antibodies from
patients with Chagas disease allowed us to compare
them with anti-P antibodies from patients with systemic
lupus erythematosus (SLE). Molecular differences
underscore the fact that antibodies againstTrypanosoma cruzi, have circulating
antibodies that may be involved in the pathogenesis
of cardiac dysfunction. To better understand this
antibody repertoire, we constructed two combinatorial
libraries, an Fab (1 108 cfu/microgram)
and an scFv (1 109 cfu/microgram) library. The
variable regions of these antibodies were compared
with the variable regions of antibodies obtained
from single plasma cells. The phage libraries were
panned against whole T. cruzi homogenates and
recombinant T. cruzi ribosomal P proteins. Several
methods, both classical and original, were used to
screen for specific Fab- and scFv-bearing phages.
AntiT. cruzi and anti-P antibodies were obtained
that reacted with different T. cruzi proteins and
with the C-terminal ends of the ribosomal P proteins.
Furthermore, the repertoire and distribution
of 148 rearranged VH genes were analyzed and
compared with available data of repertoires derived
from healthy individuals, patients with autoimmune
diseases, and patients with other infections.
Preliminary results show that the VH family
usage in the unselected libraries has an overrepresentation
of VH5 family and underrepresentation
of VH3-23related germline genes. Amongst the
antiT. cruzi clones, a VH4 overrepresentation was
evident, contributed by VH4-59 and VH4-
39related genes. By contrast, plasma cells from
cardiac inflammatory sites showed a preference for
the VH1 family. The composition of CDR3 regions
from the antibodies of the phage libraries and those
derived from plasma cells were different, pointing
to a higher degree of affinity maturation among the
latter, a finding that was confirmed by analysis of
the somatic mutations.
The characterization of anti-P antibodies from
patients with Chagas disease allowed us to compare
them with anti-P antibodies from patients with systemic
lupus erythematosus (SLE). Molecular differences
underscore the fact that antibodies against 108 cfu/microgram)
and an scFv (1 109 cfu/microgram) library. The
variable regions of these antibodies were compared
with the variable regions of antibodies obtained
from single plasma cells. The phage libraries were
panned against whole T. cruzi homogenates and
recombinant T. cruzi ribosomal P proteins. Several
methods, both classical and original, were used to
screen for specific Fab- and scFv-bearing phages.
AntiT. cruzi and anti-P antibodies were obtained
that reacted with different T. cruzi proteins and
with the C-terminal ends of the ribosomal P proteins.
Furthermore, the repertoire and distribution
of 148 rearranged VH genes were analyzed and
compared with available data of repertoires derived
from healthy individuals, patients with autoimmune
diseases, and patients with other infections.
Preliminary results show that the VH family
usage in the unselected libraries has an overrepresentation
of VH5 family and underrepresentation
of VH3-23related germline genes. Amongst the
antiT. cruzi clones, a VH4 overrepresentation was
evident, contributed by VH4-59 and VH4-
39related genes. By contrast, plasma cells from
cardiac inflammatory sites showed a preference for
the VH1 family. The composition of CDR3 regions
from the antibodies of the phage libraries and those
derived from plasma cells were different, pointing
to a higher degree of affinity maturation among the
latter, a finding that was confirmed by analysis of
the somatic mutations.
The characterization of anti-P antibodies from
patients with Chagas disease allowed us to compare
them with anti-P antibodies from patients with systemic
lupus erythematosus (SLE). Molecular differences
underscore the fact that antibodies against 109 cfu/microgram) library. The
variable regions of these antibodies were compared
with the variable regions of antibodies obtained
from single plasma cells. The phage libraries were
panned against whole T. cruzi homogenates and
recombinant T. cruzi ribosomal P proteins. Several
methods, both classical and original, were used to
screen for specific Fab- and scFv-bearing phages.
AntiT. cruzi and anti-P antibodies were obtained
that reacted with different T. cruzi proteins and
with the C-terminal ends of the ribosomal P proteins.
Furthermore, the repertoire and distribution
of 148 rearranged VH genes were analyzed and
compared with available data of repertoires derived
from healthy individuals, patients with autoimmune
diseases, and patients with other infections.
Preliminary results show that the VH family
usage in the unselected libraries has an overrepresentation
of VH5 family and underrepresentation
of VH3-23related germline genes. Amongst the
antiT. cruzi clones, a VH4 overrepresentation was
evident, contributed by VH4-59 and VH4-
39related genes. By contrast, plasma cells from
cardiac inflammatory sites showed a preference for
the VH1 family. The composition of CDR3 regions
from the antibodies of the phage libraries and those
derived from plasma cells were different, pointing
to a higher degree of affinity maturation among the
latter, a finding that was confirmed by analysis of
the somatic mutations.
The characterization of anti-P antibodies from
patients with Chagas disease allowed us to compare
them with anti-P antibodies from patients with systemic
lupus erythematosus (SLE). Molecular differences
underscore the fact that antibodies againstT. cruzi homogenates and
recombinant T. cruzi ribosomal P proteins. Several
methods, both classical and original, were used to
screen for specific Fab- and scFv-bearing phages.
AntiT. cruzi and anti-P antibodies were obtained
that reacted with different T. cruzi proteins and
with the C-terminal ends of the ribosomal P proteins.
Furthermore, the repertoire and distribution
of 148 rearranged VH genes were analyzed and
compared with available data of repertoires derived
from healthy individuals, patients with autoimmune
diseases, and patients with other infections.
Preliminary results show that the VH family
usage in the unselected libraries has an overrepresentation
of VH5 family and underrepresentation
of VH3-23related germline genes. Amongst the
antiT. cruzi clones, a VH4 overrepresentation was
evident, contributed by VH4-59 and VH4-
39related genes. By contrast, plasma cells from
cardiac inflammatory sites showed a preference for
the VH1 family. The composition of CDR3 regions
from the antibodies of the phage libraries and those
derived from plasma cells were different, pointing
to a higher degree of affinity maturation among the
latter, a finding that was confirmed by analysis of
the somatic mutations.
The characterization of anti-P antibodies from
patients with Chagas disease allowed us to compare
them with anti-P antibodies from patients with systemic
lupus erythematosus (SLE). Molecular differences
underscore the fact that antibodies againstT. cruzi ribosomal P proteins. Several
methods, both classical and original, were used to
screen for specific Fab- and scFv-bearing phages.
AntiT. cruzi and anti-P antibodies were obtained
that reacted with different T. cruzi proteins and
with the C-terminal ends of the ribosomal P proteins.
Furthermore, the repertoire and distribution
of 148 rearranged VH genes were analyzed and
compared with available data of repertoires derived
from healthy individuals, patients with autoimmune
diseases, and patients with other infections.
Preliminary results show that the VH family
usage in the unselected libraries has an overrepresentation
of VH5 family and underrepresentation
of VH3-23related germline genes. Amongst the
antiT. cruzi clones, a VH4 overrepresentation was
evident, contributed by VH4-59 and VH4-
39related genes. By contrast, plasma cells from
cardiac inflammatory sites showed a preference for
the VH1 family. The composition of CDR3 regions
from the antibodies of the phage libraries and those
derived from plasma cells were different, pointing
to a higher degree of affinity maturation among the
latter, a finding that was confirmed by analysis of
the somatic mutations.
The characterization of anti-P antibodies from
patients with Chagas disease allowed us to compare
them with anti-P antibodies from patients with systemic
lupus erythematosus (SLE). Molecular differences
underscore the fact that antibodies againstT. cruzi and anti-P antibodies were obtained
that reacted with different T. cruzi proteins and
with the C-terminal ends of the ribosomal P proteins.
Furthermore, the repertoire and distribution
of 148 rearranged VH genes were analyzed and
compared with available data of repertoires derived
from healthy individuals, patients with autoimmune
diseases, and patients with other infections.
Preliminary results show that the VH family
usage in the unselected libraries has an overrepresentation
of VH5 family and underrepresentation
of VH3-23related germline genes. Amongst the
antiT. cruzi clones, a VH4 overrepresentation was
evident, contributed by VH4-59 and VH4-
39related genes. By contrast, plasma cells from
cardiac inflammatory sites showed a preference for
the VH1 family. The composition of CDR3 regions
from the antibodies of the phage libraries and those
derived from plasma cells were different, pointing
to a higher degree of affinity maturation among the
latter, a finding that was confirmed by analysis of
the somatic mutations.
The characterization of anti-P antibodies from
patients with Chagas disease allowed us to compare
them with anti-P antibodies from patients with systemic
lupus erythematosus (SLE). Molecular differences
underscore the fact that antibodies againstT. cruzi proteins and
with the C-terminal ends of the ribosomal P proteins.
Furthermore, the repertoire and distribution
of 148 rearranged VH genes were analyzed and
compared with available data of repertoires derived
from healthy individuals, patients with autoimmune
diseases, and patients with other infections.
Preliminary results show that the VH family
usage in the unselected libraries has an overrepresentation
of VH5 family and underrepresentation
of VH3-23related germline genes. Amongst the
antiT. cruzi clones, a VH4 overrepresentation was
evident, contributed by VH4-59 and VH4-
39related genes. By contrast, plasma cells from
cardiac inflammatory sites showed a preference for
the VH1 family. The composition of CDR3 regions
from the antibodies of the phage libraries and those
derived from plasma cells were different, pointing
to a higher degree of affinity maturation among the
latter, a finding that was confirmed by analysis of
the somatic mutations.
The characterization of anti-P antibodies from
patients with Chagas disease allowed us to compare
them with anti-P antibodies from patients with systemic
lupus erythematosus (SLE). Molecular differences
underscore the fact that antibodies againstT. cruzi clones, a VH4 overrepresentation was
evident, contributed by VH4-59 and VH4-
39related genes. By contrast, plasma cells from
cardiac inflammatory sites showed a preference for
the VH1 family. The composition of CDR3 regions
from the antibodies of the phage libraries and those
derived from plasma cells were different, pointing
to a higher degree of affinity maturation among the
latter, a finding that was confirmed by analysis of
the somatic mutations.
The characterization of anti-P antibodies from
patients with Chagas disease allowed us to compare
them with anti-P antibodies from patients with systemic
lupus erythematosus (SLE). Molecular differences
underscore the fact that antibodies against
T. cruzi clearly have a different origin than true
auto-antibodies.clearly have a different origin than true
auto-antibodies.
POSTER SESSIONOSTER SESSION
Abstracts of Presentations 4949