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Daniela Fernández
3-Semestre
Biología molecular
Universidad Pontificia Bolivariana
2022
Plasmodium Falciparum
Introduction
https://www.ncbi.nlm.nih.gov/books/NBK555962/
o It is a unicellular spore-forming parasite that causes
malaria in humans
o It feeds on hemoglobin within the erythrocytes of its hosts
and produces a pigment known as hemozoin.
o It has 14 chromosomes, almost always in a single copy.
Introduction
o (Variant Surface Antigen 2-Chondroitin Sulfate A)
o Is the protein responsible for the binding of infected
erythrocytes to the placenta.
o Mediate binding to chondroitin sulfate A that induces
antibodies that block interaction with placental tissue.
https://cordis.europa.eu/article/id/203947-a-placental-malaria-vaccine
VAR2CSA
General objective
In this study, they characterize an
invariant protein associated with PM
called P falciparum chondroitin
sulfate A ligand (PfCSA-L).
Materiales y métodos
Ensayos de
inmunofluorescencia
as
Es una prueba que detecta la presencia
de un antígeno o anticuerpo en una
célula o tejido.
Es una técnica que permite analizar la
unión del ligando a las proteínas que
hay en la célula
Para evaluar interacción
entre VAR2CSA y PfCSA-L
Para detectar anticuerpos anti-PfCSA-L
Ensayo inmunoabsorbente
ligado a enzimas con suero
humano.
Microscopio de
electrones
Es una prueba que evalua la reacción entre
un antigeno y un anticuerpo.
Es una técnica que permite producir
imágenes de organismos a partir de un haz
de electrones que iluminan la muestra
Para observar los iRBCs
Para ver la reactividad de PfCSA-L y DHFR
Materiales y métodos
Results
Distribución punteada en la membrana de los GR infectados de la madre.
Detección de la proteína en parásitos maternos que se unen a CSA como
infantiles que no se unen.
Presencia de PfCSA-L intracelular en ambos aislados
Results
PfSCA-L expuesto en la superficie externa
de los iRBC
Reactividad de los anticuerpos monoclonales
contra diferentes partes de PfCSA-L
Recombinante Extracto de membrama
Discussion
Boddey JA, Carvalho
TG, Hodder AN, et
al.
The lack of uncleaved PfCSA-L is
unusual, because full-length forms are
typically observed for other exported
proteins.
Tuikue Ndam N,
Bischoff E, Proux C,
et al
The PfCSA-L is among several
proteins upregulated in CSA- binding
and maternal parasites.
Gowda AS,
Madhunapantula SV,
Achur RN,
Valiyaveettil M,
Bhavanandan VP,
Gowda DC.
A protein similar to the size of cleaved
PfCSA-L was previously detected on
the surface of CSA-binding iRBCs
using photoactivatable, radiolabeled
CSA.
Conclusion
Antibodies against PfSCA-L
that inhibit binding to CSA
Are an option for malaria
vaccine development
especially in endemic regions.
The study provided a base
for evaluating whether
these antibodies could
induce a protective
response or improve
current vaccines for this
disease.
Seminario biología

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Seminario biología

  • 2. Plasmodium Falciparum Introduction https://www.ncbi.nlm.nih.gov/books/NBK555962/ o It is a unicellular spore-forming parasite that causes malaria in humans o It feeds on hemoglobin within the erythrocytes of its hosts and produces a pigment known as hemozoin. o It has 14 chromosomes, almost always in a single copy.
  • 3. Introduction o (Variant Surface Antigen 2-Chondroitin Sulfate A) o Is the protein responsible for the binding of infected erythrocytes to the placenta. o Mediate binding to chondroitin sulfate A that induces antibodies that block interaction with placental tissue. https://cordis.europa.eu/article/id/203947-a-placental-malaria-vaccine VAR2CSA
  • 4. General objective In this study, they characterize an invariant protein associated with PM called P falciparum chondroitin sulfate A ligand (PfCSA-L).
  • 5. Materiales y métodos Ensayos de inmunofluorescencia as Es una prueba que detecta la presencia de un antígeno o anticuerpo en una célula o tejido. Es una técnica que permite analizar la unión del ligando a las proteínas que hay en la célula Para evaluar interacción entre VAR2CSA y PfCSA-L Para detectar anticuerpos anti-PfCSA-L
  • 6. Ensayo inmunoabsorbente ligado a enzimas con suero humano. Microscopio de electrones Es una prueba que evalua la reacción entre un antigeno y un anticuerpo. Es una técnica que permite producir imágenes de organismos a partir de un haz de electrones que iluminan la muestra Para observar los iRBCs Para ver la reactividad de PfCSA-L y DHFR Materiales y métodos
  • 7. Results Distribución punteada en la membrana de los GR infectados de la madre. Detección de la proteína en parásitos maternos que se unen a CSA como infantiles que no se unen. Presencia de PfCSA-L intracelular en ambos aislados
  • 8. Results PfSCA-L expuesto en la superficie externa de los iRBC Reactividad de los anticuerpos monoclonales contra diferentes partes de PfCSA-L Recombinante Extracto de membrama
  • 9. Discussion Boddey JA, Carvalho TG, Hodder AN, et al. The lack of uncleaved PfCSA-L is unusual, because full-length forms are typically observed for other exported proteins. Tuikue Ndam N, Bischoff E, Proux C, et al The PfCSA-L is among several proteins upregulated in CSA- binding and maternal parasites. Gowda AS, Madhunapantula SV, Achur RN, Valiyaveettil M, Bhavanandan VP, Gowda DC. A protein similar to the size of cleaved PfCSA-L was previously detected on the surface of CSA-binding iRBCs using photoactivatable, radiolabeled CSA.
  • 10. Conclusion Antibodies against PfSCA-L that inhibit binding to CSA Are an option for malaria vaccine development especially in endemic regions. The study provided a base for evaluating whether these antibodies could induce a protective response or improve current vaccines for this disease.