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Related Concept Videos

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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Nephrotic Syndrome I : Introduction01:24

Nephrotic Syndrome I : Introduction

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Nephrotic Syndrome is a chronic kidney disorder defined by clinical findings such as severe proteinuria, hypoalbuminemia, hyperlipidemia, and edema. These symptoms result from damage to the glomeruli, the kidney’s filtering units, increasing their permeability to proteins.Definition and Meaning:Proteinuria, defined as the loss of more than 3.5 grams of protein per day in adults, is a crucial feature of nephrotic syndrome. This condition is often accompanied by edema, the accumulation of...
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Complement System01:27

Complement System

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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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Acute Kidney Injury II: Pathophysiology01:29

Acute Kidney Injury II: Pathophysiology

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Acute kidney injury (AKI) causes are categorized into three primary categories based on the location of the injury: prerenal, intrarenal (or intrinsic), and postrenal causes. This classification guides clinical management and illustrates how different pathways can impair kidney function.Etiology and Pathophysiology of Acute Kidney Injury1. Prerenal causesEtiology: Prerenal Acute Kidney Injury, the most common type, occurs when reduced blood flow to the kidneys decreases filtration capacity...
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Nephrotic Syndrome II : Assessment and Medical Management01:26

Nephrotic Syndrome II : Assessment and Medical Management

357
IntroductionNephrotic syndrome is a kidney disorder marked by excessive protein loss in the urine, leading to various systemic complications. This condition often results from damage to the glomeruli—the kidney's filtering units—causing proteinuria, low blood protein levels, and fluid retention. Understanding the assessment, diagnosis, and management of nephrotic syndrome is essential for effective treatment and prevention of further kidney damage.AssessmentPatient History: Document...
357
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

143
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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Related Experiment Video

Updated: Apr 12, 2026

Analyses of Proteinuria, Renal Infiltration of Leukocytes, and Renal Deposition of Proteins in Lupus-prone MRL/lpr Mice
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Hypocomplementaemic immune complex tubulointerstitial nephritis.

Alok Gupta1, Serge Jothy2, Peter Somerville3

  • 1Department of Nephrology.

NDT Plus
|May 8, 2015
PubMed
Summary
This summary is machine-generated.

This study describes a rare case of rapidly progressive renal failure linked to low complement levels and a positive antinuclear antibody (ANA) test, but a negative anti-double-stranded DNA (dsDNA) antibody test. Renal biopsy revealed tubulointerstitial nephritis, highlighting a unique presentation of kidney disease.

Keywords:
hypocomplementaemicimmune complextubulointerstitial

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Area of Science:

  • Nephrology
  • Immunology
  • Pathology

Background:

  • Rapidly progressive renal failure (RPGN) necessitates prompt diagnosis and management.
  • Distinguishing causes of RPGN is crucial for targeted therapy.
  • Autoimmune markers like antinuclear antibodies (ANA) are key diagnostic tools.

Observation:

  • A patient presented with acute kidney injury and low complement levels.
  • Antinuclear antibody (ANA) testing was positive, yet anti-double-stranded DNA (dsDNA) antibodies were negative.
  • Renal biopsy findings indicated tubulointerstitial nephritis with immunoglobulin deposition.

Findings:

  • The case highlights a rare etiology of RPGN.
  • Tubulointerstitial nephritis with specific immunoglobulin staining patterns was observed.
  • Glomerular structures were spared in the biopsy.

Implications:

  • This case expands the differential diagnosis for RPGN, particularly in ANA-positive, anti-dsDNA-negative patients.
  • Understanding this presentation can guide diagnostic workups for similar renal pathologies.
  • Further research into the pathogenesis of this rare condition is warranted.