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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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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
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Reabsorption and Secretion in the PCT01:28

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The Proximal Convoluted Tubule, or PCT, plays a pivotal role in the body's filtration system. They are primarily responsible for reabsorbing solutes and water from the filtered fluid produced by the glomeruli. Most of the filtered water, ions, and organic solutes such as glucose and amino acids are reabsorbed by the PCT.
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Structure and Function of Platelets01:18

Structure and Function of Platelets

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The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
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Glomerular Filtration01:15

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The filtration membrane in the renal system is a highly specialized structure essential for filtering blood. It consists of glomerular capillaries and podocytes, forming a selective barrier that permits the passage of water and small solutes while restricting most plasma proteins and blood cells.
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Related Experiment Video

Updated: Dec 9, 2025

Evaluation of the Interplay Between the Complement Protein C1q and Hyaluronic Acid in Promoting Cell Adhesion
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Podocytes Produce and Secrete Functional Complement C3 and Complement Factor H.

Anne K Mühlig1,2, Lindsay S Keir3, Jana C Abt2

  • 1University Children's Research@Kinder-UKE, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.

Frontiers in Immunology
|September 14, 2020
PubMed
Summary
This summary is machine-generated.

Podocytes produce active complement proteins C3 and factor H (CFH), influencing kidney disease. This suggests podocytes play a role in the innate immune system and local complement regulation within the glomerulus.

Keywords:
complement secretionglomeruluskidneylocal regulationproteinuria

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Area of Science:

  • Nephrology
  • Immunology
  • Cell Biology

Background:

  • Podocytes are crucial for glomerular filtration and implicated in proteinuria seen in complement-mediated kidney diseases.
  • While complement factors are primarily produced by the liver, local synthesis within the kidney is increasingly recognized.
  • The role of podocytes in local complement production and regulation remains largely unexplored.

Purpose of the Study:

  • To investigate whether podocytes synthesize complement components, specifically complement factor H (CFH) and C3.
  • To analyze the functional activity and secretion pathways of these complement factors in podocytes.
  • To assess the impact of podocyte-derived complement factors on local glomerular complement regulation.

Main Methods:

  • Human podocytes were cultured to examine the expression and secretion of CFH and C3.
  • Functional assays were performed to confirm complement cascade initiation and regulation.
  • Animal models (PAN-treated rats, C57Bl/6 mice) were used to study in vivo expression patterns.

Main Results:

  • Cultured podocytes express and secrete functional C3 and CFH, with distinct expression patterns compared to endothelial cells.
  • Podocyte-derived C3 can initiate the complement cascade, and secreted CFH can regulate it.
  • In vivo studies confirmed CFH and C3 synthesis in murine podocytes and upregulation in a rat model of proteinuria.

Conclusions:

  • Podocytes actively produce functional complement components (C3, CFH), contributing to local glomerular complement balance.
  • Podocyte-derived complement factors can modulate complement activation and regulation, impacting kidney diseases.
  • These findings highlight a novel role for podocytes in the innate immune system and renal pathology.