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Linfocitos T
CD4+ y CD8+
Karla Cristina De los Santos Pérez I 5to A
Universidad Juárez Del Estado de Durango Facultad de Ciencias de la Salud
Generalidades de los linfocitos
CONTENIDO
01
Clasificación
02
Receptor (TCR)
03
Desarrollo de los linfocitos T
04
Linfocitos T CD8+ / citotóxicos
05
Generalidades de los linfocitos
→ Inmunidad específica/adquirida
→ Linfocitos: 20-40% de los leucocitos = 2500
/mm3
- 80% LT
- 20% LB
→ Células pequeñas y esféricas
→ Poco citoplasma y gránulos
→ Núcleo heterocromático y ocupa casi todo el
citoplasma
*Se caracterizan por expresar receptores para el
antígeno distribuidos de forma clonal, siendo que cada
uno es específico de un antígeno diferente
Lichtman, A. H. & Pillai, S. (2022, 15 marzo). Inmunología celular y molecular (10.a ed.). Elsevier.
Generalidades de los linfocitos
CONTENIDO
01
Clasificación
02
Receptor (TCR)
03
Desarrollo de los linfocitos T
04
Linfocitos T CD8+ / citotóxicos
05
Clasificación de los linfocitos T
Generalidades de los linfocitos
CONTENIDO
01
Clasificación
02
Receptor (TCR)
03
Desarrollo de los linfocitos T
04
Linfocitos T CD8+ / citotóxicos
05
Receptor (TCR = T Cell Receptor)
→ Heterodímero de dos cadenas polipeptídicas
transmembrana unidas por un enlace disulfuro
→ Cadenas (α, β, γ, δ):
- Región extracelular (región variable, Fab, 3 CDRs)
- Región transmembrana
- Región citoplasmática (5-12 AA)
*Complejo del TCR
*ITAMs
*Correceptores CD4 y CD8
Lichtman, A. H. & Pillai, S. (2022, 15 marzo). Inmunología celular y molecular (10.a ed.). Elsevier.
ITAMs = estructuras de activación tirosínica del receptor inmunitario
Reordenamiento de
los genes TCR
1. Sinapsis
2. Escisión o rotura
3. Apertura de la horquilla
y procesamiento del
extremo
4. Unión
*RSS (secuencia señal de
recombinación)
Lichtman, A. H. & Pillai, S. (2022, 15 marzo). Inmunología celular y molecular (10.a ed.). Elsevier.
Generalidades de los linfocitos
CONTENIDO
01
Clasificación
02
Receptor (TCR)
03
Desarrollo de los linfocitos T
04
Linfocitos T CD8+ / citotóxicos
05
Desarrollo de los linfocitos T
*Las células que
expresan CD25 sufren
selección beta
permitiendo seleccionar
a aquellas que tuvieron
un reordenamiento
productivo del gen de la
cadena beta
Generalidades de los linfocitos
CONTENIDO
01
Clasificación
02
Receptor (TCR)
03
Desarrollo de los linfocitos T
04
Linfocitos T CD8+ / citotóxicos
05
Linfocitos T CD8+ / citotóxicos
Lichtman, A. H. & Pillai, S. (2022, 15 marzo). Inmunología celular y molecular (10.a ed.). Elsevier.
1. Activación del LT CD8+ virgen por
reconocimiento de antígeno
*Presentación cruzada
*Coestimulación por LT CD4+
1. Proliferación / expansión clonal
*IL-2 (prolif. Y dif. en CTL )
*IFN tipo 1 (dif. en CTL)
*IL-15 (supervivencia de LT
CD8+memoria)
1. Diferenciación de LT CD8+ a CTL
* T-BET, eomesodermina y BLIMP1
1. Migración a tejidos periféricos
2. Eliminación de la célula diana
*Apoptosis
Apoptosis: vías de las
caspasas
Abbas, A. K., Aceñero, F. M. J., Moctezuma, V. I. & GEA Consultoría Editorial SL. (2021, 12 junio). Robbins y Cotran. Patología estructural y funcional
(10.a Ed) (10.a ed.). Elsevier.
GRACIAS
:)
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Linfocitos T CD4_CD8.pptx

  • 1. Linfocitos T CD4+ y CD8+ Karla Cristina De los Santos Pérez I 5to A Universidad Juárez Del Estado de Durango Facultad de Ciencias de la Salud
  • 2. Generalidades de los linfocitos CONTENIDO 01 Clasificación 02 Receptor (TCR) 03 Desarrollo de los linfocitos T 04 Linfocitos T CD8+ / citotóxicos 05
  • 3. Generalidades de los linfocitos → Inmunidad específica/adquirida → Linfocitos: 20-40% de los leucocitos = 2500 /mm3 - 80% LT - 20% LB → Células pequeñas y esféricas → Poco citoplasma y gránulos → Núcleo heterocromático y ocupa casi todo el citoplasma *Se caracterizan por expresar receptores para el antígeno distribuidos de forma clonal, siendo que cada uno es específico de un antígeno diferente Lichtman, A. H. & Pillai, S. (2022, 15 marzo). Inmunología celular y molecular (10.a ed.). Elsevier.
  • 4. Generalidades de los linfocitos CONTENIDO 01 Clasificación 02 Receptor (TCR) 03 Desarrollo de los linfocitos T 04 Linfocitos T CD8+ / citotóxicos 05
  • 5. Clasificación de los linfocitos T
  • 6. Generalidades de los linfocitos CONTENIDO 01 Clasificación 02 Receptor (TCR) 03 Desarrollo de los linfocitos T 04 Linfocitos T CD8+ / citotóxicos 05
  • 7. Receptor (TCR = T Cell Receptor) → Heterodímero de dos cadenas polipeptídicas transmembrana unidas por un enlace disulfuro → Cadenas (α, β, γ, δ): - Región extracelular (región variable, Fab, 3 CDRs) - Región transmembrana - Región citoplasmática (5-12 AA) *Complejo del TCR *ITAMs *Correceptores CD4 y CD8 Lichtman, A. H. & Pillai, S. (2022, 15 marzo). Inmunología celular y molecular (10.a ed.). Elsevier. ITAMs = estructuras de activación tirosínica del receptor inmunitario
  • 8. Reordenamiento de los genes TCR 1. Sinapsis 2. Escisión o rotura 3. Apertura de la horquilla y procesamiento del extremo 4. Unión *RSS (secuencia señal de recombinación) Lichtman, A. H. & Pillai, S. (2022, 15 marzo). Inmunología celular y molecular (10.a ed.). Elsevier.
  • 9. Generalidades de los linfocitos CONTENIDO 01 Clasificación 02 Receptor (TCR) 03 Desarrollo de los linfocitos T 04 Linfocitos T CD8+ / citotóxicos 05
  • 10. Desarrollo de los linfocitos T *Las células que expresan CD25 sufren selección beta permitiendo seleccionar a aquellas que tuvieron un reordenamiento productivo del gen de la cadena beta
  • 11. Generalidades de los linfocitos CONTENIDO 01 Clasificación 02 Receptor (TCR) 03 Desarrollo de los linfocitos T 04 Linfocitos T CD8+ / citotóxicos 05
  • 12. Linfocitos T CD8+ / citotóxicos Lichtman, A. H. & Pillai, S. (2022, 15 marzo). Inmunología celular y molecular (10.a ed.). Elsevier. 1. Activación del LT CD8+ virgen por reconocimiento de antígeno *Presentación cruzada *Coestimulación por LT CD4+ 1. Proliferación / expansión clonal *IL-2 (prolif. Y dif. en CTL ) *IFN tipo 1 (dif. en CTL) *IL-15 (supervivencia de LT CD8+memoria) 1. Diferenciación de LT CD8+ a CTL * T-BET, eomesodermina y BLIMP1 1. Migración a tejidos periféricos 2. Eliminación de la célula diana *Apoptosis
  • 13. Apoptosis: vías de las caspasas Abbas, A. K., Aceñero, F. M. J., Moctezuma, V. I. & GEA Consultoría Editorial SL. (2021, 12 junio). Robbins y Cotran. Patología estructural y funcional (10.a Ed) (10.a ed.). Elsevier.
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