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Related Concept Videos

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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The glomerulus and Bowman's capsule are two essential components of the nephron, which is the functional unit of the kidney. These microscopic structures play a critical role in the process of blood filtration to produce urine.
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The kidneys are intricate organs with millions of working units known as nephrons. Each nephron features two major structures: the renal corpuscle, which facilitates blood plasma filtration, and the renal tubule, which handles the glomerular filtrate. Blood supply is directly linked to the nephrons. The renal corpuscle consists of the glomerulus, a capillary network, and the Bowman's capsule, a double-walled epithelial structure that encases the glomerulus. The filtering of blood plasma...
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Renal Tubule and Collecting Duct01:24

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The renal tubule is divided into three parts: the proximal convoluted tubule (PCT), the Loop of Henle (LOH), and the distal convoluted tubule (DCT).
Proximal Convoluted Tubule (PCT):
The PCT is the initial segment of the renal tubule, extending from the Bowman's capsule that encloses the glomerulus. Its convoluted structure and microvilli-lined cells increase the surface area for reabsorption. The PCT reabsorbs glucose, amino acids, sodium, and water from the filtrate, ensuring essential...
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Introduction to Urinary System01:13

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The urinary system consists of two kidneys, two ureters, the urinary bladder, and the urethra.
The kidneys are bean-shaped organs located in the retroperitoneal space, on either side of the vertebral column, between the T12 and L3 vertebrae. They are partially protected by the rib cage and surrounded by perirenal fat, which provides cushioning. They are responsible for urine formation and play critical roles in regulating blood pressure, electrolyte levels, and hormone production. The ureters...
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Renal Drug Excretion: Tubular Secretion01:28

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Active tubular secretion is a robust, energy-demanding process that utilizes carrier systems to transport drugs into renal tubules. The active renal secretion systems include the organic anion transporter (OAT) for weak acids and the organic cation transporter (OCT) for weak bases. Structurally similar drugs can compete for the same transporter, potentially leading to drug accumulation and toxicity. However, this principle can be exploited therapeutically. One example is probenecid (Probalan),...
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Updated: Jun 29, 2025

Analyses of Proteinuria, Renal Infiltration of Leukocytes, and Renal Deposition of Proteins in Lupus-prone MRL/lpr Mice
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[The complement cascade in renal pathology].

E Vonbrunn1, C Daniel2

  • 1Abteilung Nephropathologie, Pathologisches Institut, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Krankenhausstr. 8-10, 91054, Erlangen, Deutschland.

Pathologie (Heidelberg, Germany)
|April 5, 2024
PubMed
Summary
This summary is machine-generated.

The complement system, crucial for innate immunity, can cause kidney disease when overactivated or dysregulated. Understanding its role is key to diagnosing and treating renal conditions.

Keywords:
AntibodiesC3GImmune systemLectinMicroangiopathy

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Area of Science:

  • Immunology
  • Nephrology

Background:

  • The complement system is a vital part of the innate immune system, involving numerous proteins that mediate inflammatory and cellular responses.
  • Its activation pathways converge to form the membrane attack complex, which can lyse cells.

Purpose of the Study:

  • To review the structure of the complement system.
  • To explore the role of complement dysregulation in the cause and modulation of kidney diseases.
  • To highlight the diagnostic utility of detecting complement deposits in renal pathology.

Main Methods:

  • This review synthesizes current research on the complement system and its involvement in renal diseases.
  • It examines the mechanisms of complement activation and its consequences in various kidney conditions.
  • The review discusses the implications of complement dysregulation in both primary and secondary kidney diseases.

Main Results:

  • The complement system is implicated in nearly all kidney diseases, not just immune-mediated ones.
  • Dysregulation can occur directly through defective complement factors or indirectly via secondary activation due to renal damage.
  • Complement deposits are significant diagnostic markers for kidney disease.

Conclusions:

  • The complement system plays a dual role in kidney disease, acting as both a potential trigger and a modulator of pathology.
  • Understanding complement activation pathways and dysregulation is essential for advancing the diagnosis and treatment of renal diseases.