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Immune Receptors and Signal Transduction Notes – T-Cell Signaling & Pathways

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Comprehensive Study Notes on Immune Receptors & Signal Transduction High-yield, visually structured study guide covering key concepts of immune cell signaling, receptor architecture, and intracellular transduction pathways. Ideal for medical, pre-med, veterinary, and life sciences students preparing for immunology exams or quick revisions. Key Topics Covered: General Concepts of Cellular Signaling & Receptor Functions Enzymes and Signal Modifications (Kinases, Phosphorylation) Modular Domains: SH2, SH3, PH, and PTB domains Non-Receptor Kinases & Adaptor Proteins ITAM and ITIM Motifs in immune cell activation and regulation T-Cell Receptor (TCR) Signaling Complex: CD3 chains, Lck, ZAP-70, and SYK interactions Downstream Signaling Pathways: PLC-gamma, Ras-MAPK, DAG, IP3, Ca2+ release, and transcription factor activation (NF-kB, NFAT) Why choose these notes? Includes detailed diagrams illustrating receptor binding and intracellular cascades. Clear outline and structured subtopics for fast exam preparation. Simplifies complex biochemical pathways into easy-to-understand concepts

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USFQ · Inmunología

, ÍNDICE
1. Concepto general de señalización celular

2. Funciones de los receptores

3. Cómo se inicia una señal

4. Enzimas y modificaciones que regulan la señalización

5. Principales clases de receptores

6. Dominios modulares: SH2, SH3, PH y PTB

7. Quinasas no receptoras y proteínas adaptadoras

8. ITAM e ITIM

9. Arquitectura del receptor de antígeno

10. TCR, CD3 y cadenas ζ

11. Correceptores CD4 y CD8

12. Inicio de la señalización del TCR

13. ZAP-70, LAT y SLP-76

14. PI3K y PIP3

15. Resumen de la lógica de la señal



1. CONCEPTO GENERAL DE SEÑALIZACIÓN CELULAR
La señalización celular es el conjunto de eventos moleculares mediante los cuales una célula detecta una señal
externa y la convierte en cambios funcionales dentro de la célula. La señal comienza con el reconocimiento de un
ligando por un receptor y continúa mediante una cascada de modificaciones de proteínas, reclutamiento de
moléculas y activación de vías intracelulares. El objetivo final no es simplemente “encender” una célula: la señal
puede modificar su supervivencia, metabolismo, migración, proliferación, diferenciación, secreción o expresión
génica.
En términos generales, una señal iniciada en la membrana puede dividirse en una fase citosólica y una fase nuclear.
Durante la fase citosólica se modifican proteínas mediante fosforilación, desfosforilación, ubiquitinación, proteólisis u
otras modificaciones. Estas modificaciones generan sitios de unión y activan nuevas proteínas. Posteriormente,
algunos factores de transcripción se activan o se trasladan al núcleo, donde modifican la expresión de genes diana.

CONCEPTO · Idea central

Reconocimiento externo → receptor → proteínas de señalización → factores de transcripción y/o efectores
citoplasmáticos → respuesta celular.




USFQ · Inmunología

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Uploaded on
October 24, 2026
Number of pages
14
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2026/2027
Type
Class notes
Professor(s)
Juan mosquera
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Immune receptors and signal transduction notes – t-cell signaling & pathways
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