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Filtration and Urine Formation01:32

Filtration and Urine Formation

The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys.
Drug Elimination by Renal Route: Glomerular Filtration01:17

Drug Elimination by Renal Route: Glomerular Filtration

The kidney serves as the primary organ responsible for eliminating drugs and their metabolites from the body. This process, known as renal elimination, starts with glomerular filtration and results in urine formation. Each kidney houses millions of functional units called nephrons, where urine production takes place. A nephron has two main components: a renal corpuscle and a renal tubule. Drugs gain access to the kidney via the renal artery, which progressively branches off into afferent...
Drug Elimination by Renal Route: Tubular Secretion01:15

Drug Elimination by Renal Route: Tubular Secretion

Once the process of glomerular filtration is completed, blood carrying unfiltered drug molecules traverses through efferent arterioles and makes its way into the peritubular capillaries in the proximal tubule. A variety of carriers play a pivotal role in actively secreting drugs from these peritubular capillaries into the tubular fluid. The organic anion transporter transfers acidic drugs, against an electrochemical gradient, from the peritubular capillaries into the renal tubule cells and...
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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 membrane...
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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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Related Experiment Video

Updated: Jun 28, 2026

Analyses of Proteinuria, Renal Infiltration of Leukocytes, and Renal Deposition of Proteins in Lupus-prone MRL/lpr Mice
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Classical pathway of complement activation in mammalian kidneys

J Zwirner1, E Felber, R Burger

  • 1Institut für Immunologie, Ludwig-Maximilians-Universität München, Germany.

Immunology
|October 1, 1993
PubMed
Summary

Monoclonal antibodies (mAbs) targeting the complement C4d fragment were tested against mammalian complement. These studies confirmed C4d presence in mammalian glomeruli, indicating classical pathway activation and immune complex clearance.

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Area of Science:

  • Immunology
  • Nephrology
  • Complement System

Background:

  • The complement system plays a crucial role in immune responses and homeostasis.
  • Complement protein C4 (C4) and its fragments, particularly C4d, are important biomarkers in various immunological and renal conditions.
  • Understanding the distribution and function of C4d in mammals is essential for diagnosing and managing kidney diseases.

Purpose of the Study:

  • To investigate the cross-reactivity of monoclonal antibodies (mAbs) specific for human complement C4d and C4 gamma-chain against mammalian complement proteins.
  • To determine the presence and localization of C4d deposits in mammalian glomeruli.
  • To elucidate the role of glomerular C4d deposition in renal homeostasis and immune complex clearance.

Main Methods:

  • Development and testing of monoclonal antibodies (mAbs M4d2, M4d3, M4c3) against human complement C4d and C4 gamma-chain.
  • Cross-reactivity assays using complement from various mammalian species (guinea-pig, cattle, baboon, rhesus monkey) via activation ELISA.
  • Immunohistochemical staining of renal tissue sections from different mammalian species, including complement-deficient animals, to detect glomerular C4d deposits.
  • Comparison of glomerular IgM deposits in normal versus complement-deficient guinea-pigs.

Main Results:

  • mAbs M4d2 and M4d3 showed cross-reactivity with C4d from guinea-pig, cattle, baboon, and rhesus monkey complement.
  • mAbs M4d2 and M4d3, but not M4c3, stained glomerular deposits in renal tissues of pigs, cattle, and guinea-pigs.
  • Specificity of M4d2 staining was confirmed in kidney specimens from C4-deficient guinea-pigs, indicating the presence of C4d in mammalian glomeruli.
  • C4-deficient and C2-deficient guinea-pigs exhibited markedly increased glomerular IgM deposits compared to normal animals.

Conclusions:

  • The C4d fragment is present in mammalian glomeruli, similar to humans.
  • Glomerular C4d deposition signifies activation of the complement classical pathway.
  • Glomerular C4d deposition appears to be a general phenomenon in renal homeostasis and plays a role in the physiological clearance of immune complexes.