Immunology: Innate Immune System Course

Lesson 1 • Soluble Mediators and Chemical Signals

Covers cytokines, chemokines, and complement as soluble effectors. Links chemical signaling to cellular recruitment and activation.

Lesson 2 • Overview of Host Defense Mechanisms

Introduces the two-branch immune system and their functional roles. Provides the conceptual scaffold for all subsequent immunology content.

Lesson 3 • Cellular Components of Innate Immunity

Surveys the major innate immune cell types and their origins. Connects cellular diversity to functional specialization throughout the chapter.

Lesson 1 • Integration of Danger Signals

Synthesizes how multiple PRR inputs are integrated to calibrate response magnitude. Prepares students for understanding inflammatory thresholds.

Lesson 2 • Toll-Like Receptor Family

Details TLR structure, ligand specificity, and subcellular localization. Links TLR engagement to NF-κB and interferon signaling pathways.

Lesson 3 • Damage-Associated Molecular Patterns

Introduces DAMPs as endogenous danger signals released during cell stress. Connects sterile inflammation to innate immune activation.

Lesson 4 • Cytosolic and Other Pattern Recognition Receptors

Covers NLRs, RLRs, and cGAS-STING as intracellular sensors. Expands recognition beyond TLRs to cytoplasmic and nuclear compartments.

Lesson 1 • Negative Regulation and Signal Termination

Identifies mechanisms that limit innate signaling to prevent immunopathology. Balances the activation-focused sections with resolution biology.

Lesson 2 • Inflammasome Activation and Pyroptosis

Explains two-signal model of inflammasome priming and activation. Connects caspase-1 activity to IL-1β maturation and pyroptotic cell death.

Lesson 3 • MAPK and AP-1 Signaling

Covers ERK, JNK, and p38 MAPK cascades downstream of PRRs. Links AP-1 transcription factor activation to cytokine and enzyme gene expression.

Lesson 4 • Type I Interferon Signaling

Details IRF3/IRF7 activation and IFN-α/β production. Establishes antiviral innate immunity as a distinct transcriptional program.

Lesson 1 • Mast Cells, Basophils, and Eosinophils

Covers degranulation, mediator release, and roles in parasitic and allergic defense. Completes the survey of granulocyte effector functions.

Lesson 2 • Neutrophil Extracellular Traps

Explains NET structure, formation pathways, and antimicrobial function. Introduces NETs as a distinct effector mechanism beyond phagocytosis.

Lesson 3 • Macrophage Polarization and Effector States

Contrasts M1 and M2 macrophage phenotypes and their functional outputs. Connects polarization signals to tissue-specific immune outcomes.

Lesson 4 • Mechanisms of Phagocytosis

Covers receptor-mediated engulfment, phagosome formation, and maturation. Anchors cellular killing to molecular machinery introduced in prior chapters.

Lesson 1 • Classical Pathway Activation

Traces C1q binding through C3 convertase assembly. Connects antibody-independent and antibody-dependent triggers to downstream effectors.

Lesson 2 • Complement Effector Functions

Analyzes opsonization, anaphylatoxin activity, and immune complex clearance. Connects complement outputs to phagocyte and mast cell responses.

Lesson 3 • Lectin and Alternative Pathways

Covers MBL-MASP and spontaneous C3 tick-over mechanisms. Highlights antibody-independent innate complement activation.

Lesson 4 • Terminal Pathway and MAC Formation

Details C5 convertase activity and membrane attack complex assembly. Links lytic complement activity to gram-negative bacterial killing.

Lesson 1 • Pro-Inflammatory Cytokine Networks

Analyzes IL-1β, TNF-α, and IL-6 as master regulators of acute inflammation. Connects cytokine cascades to fever, acute-phase response, and sepsis.

Lesson 2 • Leukocyte Recruitment Cascade

Details selectin-mediated rolling, integrin activation, and transendothelial migration. Connects chemokine gradients to directed leukocyte trafficking.

Lesson 3 • Resolution of Inflammation

Introduces pro-resolving mediators and cellular programs that terminate inflammation. Establishes resolution as an active, regulated process.

Lesson 4 • Lipid Mediators of Inflammation

Covers arachidonic acid metabolism via COX and LOX pathways. Links prostaglandins, leukotrienes, and PAF to specific inflammatory effects.

Lesson 1 • Skin Innate Immune Mechanisms

Details keratinocyte immune functions, Langerhans cells, and dermal innate cells. Connects skin barrier disruption to inflammatory skin disease.

Lesson 2 • Epithelial Barrier Immune Functions

Covers tight junctions, antimicrobial peptides, and epithelial PRR expression. Establishes the epithelium as an active immune sentinel layer.

Lesson 3 • Gut Innate Immunity and Microbiome

Analyzes Peyer's patches, ILCs, and microbiome interactions in intestinal defense. Connects commensal colonization to innate immune calibration.

Lesson 4 • Tolerance vs. Defense at Mucosal Sites

Examines mechanisms preventing inflammatory responses to commensals and food antigens. Connects tolerance failures to inflammatory bowel disease and allergy.

Lesson 1 • Innate Immune Memory and Trained Immunity

Introduces epigenetic reprogramming of innate cells as a form of immunological memory. Connects trained immunity to vaccine design and disease susceptibility.

Lesson 2 • Innate Immunity and Cancer

Examines NK cell tumor surveillance, macrophage polarization in tumors, and innate immune evasion. Connects innate biology to cancer immunotherapy rationale.

Lesson 3 • Innate Immunity in Infectious Disease

Analyzes innate responses to bacteria, viruses, fungi, and parasites. Connects pathogen evasion strategies to clinical disease severity.

Lesson 4 • Therapeutic Targeting of Innate Pathways

Surveys approved and investigational agents targeting innate immune components. Connects molecular targets to clinical indications and mechanisms of action.