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Disorders of Leukocytes01:27

Disorders of Leukocytes

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Leukocyte disorders can lead to either leukopenia, characterized by an abnormally low leukocyte count, or leukocytosis, marked by a very high leukocyte number.
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Defense Against Bacterial Pathogens01:31

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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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Complement System01:27

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

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Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial...
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Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

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Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...
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Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

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Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum...
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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

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Immune complexes and complement hypercatabolism in patients with leprosy.

B Bjorvatn, R S Barnetson, G Kronvall

    Clinical and Experimental Immunology
    |December 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Immune complexes and C3d levels were studied in leprosy patients. Elevated levels were found in erythema nodosum leprosum (ENL), suggesting extravascular immune complexes play a role in ENL pathogenesis.

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    Analyses of Proteinuria, Renal Infiltration of Leukocytes, and Renal Deposition of Proteins in Lupus-prone MRL/lpr Mice
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    Area of Science:

    • Immunology
    • Infectious Diseases
    • Clinical Chemistry

    Background:

    • Leprosy is a chronic infectious disease caused by Mycobacterium leprae.
    • Immune complexes and complement activation are implicated in leprosy pathogenesis and its complications.
    • Erythema nodosum leprosum (ENL) is a common inflammatory complication of leprosy.

    Purpose of the Study:

    • To investigate the occurrence of immune complexes and C3d levels in different forms of leprosy.
    • To correlate these markers with disease activity and complications, particularly ENL.
    • To explore the potential diagnostic value of C3d in ENL.

    Main Methods:

    • Quantitative analysis of serum 125I-C1q binding activity to detect immune complexes.
    • Measurement of plasma C3d levels, a complement breakdown product.
    • Comparison of results across patient groups: ENL, uncomplicated lepromatous leprosy, and tuberculoid leprosy.

    Main Results:

    • Increased 125I-C1q binding activity was observed in sera from patients with ENL (80%), lepromatous leprosy (82%), and tuberculoid leprosy (58%).
    • Elevated plasma C3d levels were found in most ENL patients (70%) but rarely in lepromatous (18%) and never in tuberculoid leprosy.
    • In vitro studies suggested the presence of mycobacterial antigen-containing immune complexes in leprosy sera.

    Conclusions:

    • The findings suggest the presence of immune complexes in various forms of leprosy.
    • The discrepancy between C1q binding and C3d levels in ENL may indicate extravascular immune complex involvement.
    • Plasma C3d quantitation could be valuable for early diagnosis of ENL in leprosy patients.