NPTE Online Certificate Course on Immunology

Introduction

• Course presented by Sudip Hos, Department of Biotechnology, IIT Kharagpur.
• Collaboration with Professor Agno Ganguli.
• Focus on basic concepts of Immunology.
• Immunology is the study of the immune system and its role in protecting against invaders (pathogens).

Key Concepts of Immunology

• Immune System Components: Understanding the various components of the immune system and their interactions is crucial.
• Prerequisites: Basic knowledge of biochemistry, cell biology, molecular biology, and genetics is expected for full understanding.

Recommended Texts

1. Basic Immunology by Abul K. Abbas and Andrew H. Lichtman
2. Immunology by David Male and co-authors
3. Kuby Immunology
4. Immunobiology (various editions available; latest is recommended due to ongoing research)

Definitions

• Innate Immunity: Immediate, non-specific defense mechanisms that act against pathogens.
• Adaptive Immunity: Specific immune responses that take time to develop, targeting specific pathogens.

Fundamental Goals of the Immune System

• Kill the pathogen without harming the host.
• Distinguish between self and non-self to eliminate foreign substances effectively.

Historical Perspective

• Ancient Greece: Understanding of immunity dates back to survivors of diseases having protection against future infections.
• Variolation: An early practice for smallpox protection dating back to the 1400s in the Middle East and China.
• Edward Jenner: Pioneered vaccination for smallpox using cowpox. His work is foundational in Immunology.
• Louis Pasteur: Developed vaccines for cholera and rabies.

Course Structure

• Initial lectures will cover:
  • Origin of vertebrate immune cells.
  • Principles of innate immunity.
  • Principles of adaptive immunity.
  • Mechanisms of immunity.

Immune Cell Origins

• All immune cells originate from hematopoietic stem cells in bone marrow.
• Common Lymphoid Progenitor produces:
  • B cells (B lymphocytes)
  • T cells (T lymphocytes)
  • Natural Killer (NK) cells
  • Innate Lymphoid Cells (ILC)
• Common Myeloid Progenitor produces:
  • Dendritic cells
  • Granulocytes (neutrophils, basophils, eosinophils)
  • Monocytes (which become macrophages)

Immune Response Phases

• Innate Immunity: Immediate response, includes barriers and inflammatory reactions.
• Adaptive Immunity: Specific and takes longer to respond,
  • B cells produce antibodies.
  • T cells perform various roles (helper cells and cytotoxic cells).

Components of Innate Immunity

1. Anatomic Barriers: Skin, oral mucosa, respiratory epithelium, intestinal lining.
2. Immune Cells: Macrophages, granulocytes, NK cells.
3. Complement System: Proteins that target and destroy pathogens.
4. Inflammatory Inducers: Signals that activate the immune response (e.g., bacterial lipopolysaccharides, urate crystals).

Immune System Activation

• Pathogen or tissue damage activates immune response.
• Inflammation: Mediators released by sensor cells (e.g., cytokines, chemokines) signal an immune response.

Immunological Memory

• Memory B and T cells provide faster responses upon re-exposure to pathogens.
• Primary response: antibody production takes 7-10 days.
• Secondary response: faster (3-4 days) due to memory cells.

Conclusion

• The next class will discuss components of blood or immune system relevant to both innate and adaptive immunity.