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Laura María Másmela Gil.
Sebastián Gómez Restrepo.
School of Medicine.
3th Semester.


        CD24 promotes tumor cell invasion by
              suppressing tissue factor
        pathway inhibitor-2 (TFPI-2) in a c-Src-
                dependent fashion.
     Niko Bretz , Aurelia Noske, Sascha Keller , Natalie Erbe-Hofmann,
        Thomas Schlange , Alexei V. Salnikov ,Gerd Moldenhauer ,
                     Glen Kristiansen , Peter Altevogt.
Introduction.
CD24.
                                     Importantly, CD24 is
                                          often highly
Is a glycoprotein expressed on the   expressed in human
cell surface of most B                solid tumors (lung,
lymphocytes and mature                       brain,
granulocytes; Is a cell adhesion     stomach, colorectal,
molecule.                               prostate, breast
                                       and ovary) and is
                                       associated with a
                                        poor prognosis.
Introduction
                                Increase in
                              number of cells
                               composing a
                                  tissue.




                               Tumour.

  A benign tumor is a type
                                                   Malignant tumors are
     of tumor does not
  grow disproportionately                       cancerous. Cancer cells can
 and aggressively, does not                     invade and damage tissues
invade surrounding tissues.                     and organs near the tumor
Introduction
TFPI-2                         The first K domain inhibits
                               coagulation factor VIIa
                               complexed to tissue factor (TF).
      Human TFPI is a
  physiological inhibitor of
  the extrinsic pathway of     The second K domain inhibits
                               factor Xa.
coagulation and functions in
 anticoagulation and anti-
    inflammation. It is a
secreted protein with three    The third K domain binds to
                               heparin.
     Kunitz (K) domains.
Introduction




      Tissue factor (TF) is a transmembrane
glycoprotein that initiates the extrinsic pathway of
         coagulation cascade and acts as a
  receptor and enzyme cofactor factor VII. Also is
     directly related to the aggressive cancer.
Introduction
C Src.

 Is an endogenous protein
 from the family of
 tyrosine kinases, which is
 present in the cytosol of
 the cell.
 c-Src is the gene product
 of the same proto-
 oncogene c-Src, that is a
 precursor of a potentially
 cancer causing.
Relación

 TFPI-2
General Objective.
• Study the mechanism of cell
                     FPI-2
  invasion with CD24-dependent CD24 knock-
  down or transient over expression in human
  cancer cell lines.
MATERIALES Y MÉTODOS
materiales y métodos
                                   células


              Se utilizaron 3 tipos de líneas celulares tumorales




           A549                      SKOV3ip                HS683 SNB19




Adenocarcinoma pulmonar         Carcinoma de ovario             glioblastoma
Materiales y métodos




                       Como control
                       negativo
Materiales y métodos



Mediante el     siRNA
  “Ambion                 TFPI-2
               “marca,             oligofectamina
siRNA target               Src
   finder”     señala”
Materiales y métodos


 Micro arreglos.


Fueron analizadas dos replicas
  biológicas independientes:
            genes.
Materiales y métodos
Materiales y métodos

                           Es una técnica que
                             permite medir
                                                Utlización de FACS
                           simultáneamente
Citometría de flujo                              Canto II FlowJo
                                múltiples
                                                     software.
                           marcadores de una
                               sola célula.
Materiales y métodos
         Western blot


    Detección de proteínas


         Lisis celular


Mediante una electroforesis en     pesadas
 gel: separación de proteínas

  transferencia a membrana
          absorbente

Detección: anticuerpo primario-
    anticuerpo secundario
Materiales y métodos

                     Separación de
                   Muestra de la matriz
                    extracelular y de
                         células
                                                 para
                                           detección de la
                                          proteína TFPI-2 se
Sembrado celular
                                              utilizo un
                                             anticuerpo.




                    Análisis
                   de TFPI-2
Materiales y métodos


              Procedimiento
              histopatológic
                                 Uso de
              o de cánceres
                                 anticuerpo
              de mama
                                 especifico,               Localización
              primarios,
                                 marcado con   Muestra     del
Inmunohisto   lesiones in situ
                                 una enzima    fijada en   complejo
  química.    de carcinoma,
                                 que puede     parafina.   antígeno-
              metástasis
                                 transformar               anticuerpo.
              recurrentes
                                 CD24 en
              locales y
                                 visible.
              distales.
Resultados

La caída de CD24 afecta la invasión de líneas
celulares cancerosas.
• Se demuestra el rol de CD24 en la regulación
  de la invasión de células tumorales.
• La ausencia de CD24 reduce la
  invasión de células tumorales humanas.
Resultados
Resultados

En células de carcinoma colorrectal y de
 páncreas CD24 fue expresado
 para controlar la expresión génica
 por un mecanismo desconocido hasta ahora.

                                                    Disminución de la
                                                   expresión del CD24.
     El agotamiento trasitorio
         de TFPI-2 modula
       la invasión de células          Aumenta el TPFI-2
         cancerígenas en el                                 En todas las líneas
              pulmón                                       celulares estudiadas.
Resultados
Resultados

• Expresión del TFPI-2 inhibe la invasión
  celular.

TFPI-2 juega un papel
importante en la regulación
de la invasión de células
tumorales.
Resultados

• Sobre- expresión de CD24, suprime el TFPI-2;
  aumentando la invasión célular.

                   Isoformas.



       CD24-Ala                           CD24-Val


                      La expresión
                    de ambas formas
                        reduce la
                   cantidad del TFPI-2.
Resultados

Agotamiento de CD24 afecta la actividad de C Src.

CD24 se localiza en las balsas de membrana junto
con el C Src.

 El eje CD24-Src juega un papel importante en la
 regulación y expresión del TFPI 2.
Resultados
Discusión

   AUTHOR                     WHAT HE/SHE SAID                     AGREE   DESAGREE

konduri SD and “Importantly, the up-regulation of TFPI-2 mRNA        X
    others     was not only detected in SKOV3ip but also in
               HS683 and A549 cells. Concomitantly, in all
               three cell lines we noticed a significantly
               reduced cell invasion that was not seen in
               SNB19 cells having no detectable levels of TFPI-
               2.”


 Sierko E,      “Our findings establish a link between CD24          X
Wojtukiewicz    and TFPI-2, a proteinase inhibitor known for its
MZ, Kisiel W    important role in the inhibition of tumor cell
                invasiveness,    neoplastic     growth,    and
                metastases formation”
DISCUSIÓN

  AUTHOR                WHAT HE/SHE SAID              AGREE   DESAGREE


Taniuchi K,     “In the presence of CD24 the                     x
Nishimori I,    cleavage of BART
Hollingsworth   mRNA by G3BP was blocked
MA              whereas both BART or
                CD24 siRNA depletion resulted in
                enhanced cell motility
                and invasion”
Sierko E,       “The TFPI-2 gene is considered a        x
Wojtukiewicz    tumor suppressor
MZ, Kisiel W    gene as its down-regulation or loss
                is associated with
                increasing malignancy”
DISCUSIÓN
DISCUSIÓN
conclusiones

• 1. In summary the results demonstrate for the
  first time that CD24 can regulate the
  expression of TFPI-2.

• 2. it was showed that cellular invasion was
  significantly reduced after CD24 knock down
  or after TRPI-2 overexpression
conclusiones

• 3. these findings suggest that the depletion of
  CD24 in malignant tumors might offer a new
  possibility to interfere with tumor progression.

• 4. in clinical practice is important to
  know about the expression of CD24 and TFPI-
  2 in tumor invasion or no invasion of
  many body cells for potential cancer
  treatments.
Mapa conceptual- Laura
Mapa conceptual-Sebastián
Thanks!

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Seminario final 2012 biología molecular.laura-sebastían

  • 1. Laura María Másmela Gil. Sebastián Gómez Restrepo. School of Medicine. 3th Semester. CD24 promotes tumor cell invasion by suppressing tissue factor pathway inhibitor-2 (TFPI-2) in a c-Src- dependent fashion. Niko Bretz , Aurelia Noske, Sascha Keller , Natalie Erbe-Hofmann, Thomas Schlange , Alexei V. Salnikov ,Gerd Moldenhauer , Glen Kristiansen , Peter Altevogt.
  • 2. Introduction. CD24. Importantly, CD24 is often highly Is a glycoprotein expressed on the expressed in human cell surface of most B solid tumors (lung, lymphocytes and mature brain, granulocytes; Is a cell adhesion stomach, colorectal, molecule. prostate, breast and ovary) and is associated with a poor prognosis.
  • 3. Introduction Increase in number of cells composing a tissue. Tumour. A benign tumor is a type Malignant tumors are of tumor does not grow disproportionately cancerous. Cancer cells can and aggressively, does not invade and damage tissues invade surrounding tissues. and organs near the tumor
  • 4. Introduction TFPI-2 The first K domain inhibits coagulation factor VIIa complexed to tissue factor (TF). Human TFPI is a physiological inhibitor of the extrinsic pathway of The second K domain inhibits factor Xa. coagulation and functions in anticoagulation and anti- inflammation. It is a secreted protein with three The third K domain binds to heparin. Kunitz (K) domains.
  • 5. Introduction Tissue factor (TF) is a transmembrane glycoprotein that initiates the extrinsic pathway of coagulation cascade and acts as a receptor and enzyme cofactor factor VII. Also is directly related to the aggressive cancer.
  • 6. Introduction C Src. Is an endogenous protein from the family of tyrosine kinases, which is present in the cytosol of the cell. c-Src is the gene product of the same proto- oncogene c-Src, that is a precursor of a potentially cancer causing.
  • 8. General Objective. • Study the mechanism of cell FPI-2 invasion with CD24-dependent CD24 knock- down or transient over expression in human cancer cell lines.
  • 10. materiales y métodos células Se utilizaron 3 tipos de líneas celulares tumorales A549 SKOV3ip HS683 SNB19 Adenocarcinoma pulmonar Carcinoma de ovario glioblastoma
  • 11. Materiales y métodos Como control negativo
  • 12. Materiales y métodos Mediante el siRNA “Ambion TFPI-2 “marca, oligofectamina siRNA target Src finder” señala”
  • 13. Materiales y métodos Micro arreglos. Fueron analizadas dos replicas biológicas independientes: genes.
  • 15. Materiales y métodos Es una técnica que permite medir Utlización de FACS simultáneamente Citometría de flujo Canto II FlowJo múltiples software. marcadores de una sola célula.
  • 16. Materiales y métodos Western blot Detección de proteínas Lisis celular Mediante una electroforesis en pesadas gel: separación de proteínas transferencia a membrana absorbente Detección: anticuerpo primario- anticuerpo secundario
  • 17. Materiales y métodos Separación de Muestra de la matriz extracelular y de células para detección de la proteína TFPI-2 se Sembrado celular utilizo un anticuerpo. Análisis de TFPI-2
  • 18. Materiales y métodos Procedimiento histopatológic Uso de o de cánceres anticuerpo de mama especifico, Localización primarios, marcado con Muestra del Inmunohisto lesiones in situ una enzima fijada en complejo química. de carcinoma, que puede parafina. antígeno- metástasis transformar anticuerpo. recurrentes CD24 en locales y visible. distales.
  • 19. Resultados La caída de CD24 afecta la invasión de líneas celulares cancerosas. • Se demuestra el rol de CD24 en la regulación de la invasión de células tumorales. • La ausencia de CD24 reduce la invasión de células tumorales humanas.
  • 21. Resultados En células de carcinoma colorrectal y de páncreas CD24 fue expresado para controlar la expresión génica por un mecanismo desconocido hasta ahora. Disminución de la expresión del CD24. El agotamiento trasitorio de TFPI-2 modula la invasión de células Aumenta el TPFI-2 cancerígenas en el En todas las líneas pulmón celulares estudiadas.
  • 23. Resultados • Expresión del TFPI-2 inhibe la invasión celular. TFPI-2 juega un papel importante en la regulación de la invasión de células tumorales.
  • 24. Resultados • Sobre- expresión de CD24, suprime el TFPI-2; aumentando la invasión célular. Isoformas. CD24-Ala CD24-Val La expresión de ambas formas reduce la cantidad del TFPI-2.
  • 25. Resultados Agotamiento de CD24 afecta la actividad de C Src. CD24 se localiza en las balsas de membrana junto con el C Src. El eje CD24-Src juega un papel importante en la regulación y expresión del TFPI 2.
  • 27. Discusión AUTHOR WHAT HE/SHE SAID AGREE DESAGREE konduri SD and “Importantly, the up-regulation of TFPI-2 mRNA X others was not only detected in SKOV3ip but also in HS683 and A549 cells. Concomitantly, in all three cell lines we noticed a significantly reduced cell invasion that was not seen in SNB19 cells having no detectable levels of TFPI- 2.” Sierko E, “Our findings establish a link between CD24 X Wojtukiewicz and TFPI-2, a proteinase inhibitor known for its MZ, Kisiel W important role in the inhibition of tumor cell invasiveness, neoplastic growth, and metastases formation”
  • 28. DISCUSIÓN AUTHOR WHAT HE/SHE SAID AGREE DESAGREE Taniuchi K, “In the presence of CD24 the x Nishimori I, cleavage of BART Hollingsworth mRNA by G3BP was blocked MA whereas both BART or CD24 siRNA depletion resulted in enhanced cell motility and invasion” Sierko E, “The TFPI-2 gene is considered a x Wojtukiewicz tumor suppressor MZ, Kisiel W gene as its down-regulation or loss is associated with increasing malignancy”
  • 31. conclusiones • 1. In summary the results demonstrate for the first time that CD24 can regulate the expression of TFPI-2. • 2. it was showed that cellular invasion was significantly reduced after CD24 knock down or after TRPI-2 overexpression
  • 32. conclusiones • 3. these findings suggest that the depletion of CD24 in malignant tumors might offer a new possibility to interfere with tumor progression. • 4. in clinical practice is important to know about the expression of CD24 and TFPI- 2 in tumor invasion or no invasion of many body cells for potential cancer treatments.