immunology

Antibodies and T Cells

• High Affinity Antibodies:

  • Produced with the help of T cells.

  • Critical for effective immune response.

  • Require interaction with T cell receptors (TCR).

T Cells and Their Structures

• T Cells:

  • Have CD4+ (helper T cells) and TCR receptors.

  • TCR is structurally different from CD4.

• Types of T Cells:

  • Helper T Cells (CD4+):

    • Assist other immune cells in mounting an immune response.

  • T Regulatory Cells (Tregs):

    • Also have CD4 on their cell surface.

    • Regulate immune responses and maintain tolerance.

• TCR Types:

  • Alpha Beta TCR:

    • Common TCR found in traditional T cells.

    • Key for recognizing specific antigens.

Lymphocyte Classification

• Lymphocytes:

  • A type of immune cell vital for adaptive immune responses.

• Naive Lymphocytes:

  • Lymphocytes that have not yet encountered an antigen.

• Lymphoid Tissue:

  • Can be categorized into two types:

    • Generative Sites:

      • Examples include bone marrow and thymus.

      • Site where lymphocytes develop and mature.

    • Peripheral Sites:

      • Where lymphocytes encounter antigens.

Immune Cell Interaction with Antigens

• Fluid Accumulation:

  • Lymphatic vessels and blood vessels play roles in the movement of lymph fluid and immune cells.

  • Antigen exposure occurs outside the blood vessels, where fluid accumulates, allowing for interaction with various cells.