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Related Concept Videos

Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate01:25

Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate

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The glomerular filtration rate (GFR) is a critical indicator of kidney health, reflecting how well the kidneys filter blood. Changes in GFR can signal potential kidney impairment, necessitating accurate measurement methods to monitor kidney function effectively.Various molecules can serve as markers for GFR measurement, with the ideal marker meeting several specific criteria. It must freely filter at the glomerulus, avoid reabsorption or secretion by the renal tubules, remain unmetabolized, not...
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Factors Influencing Drug Absorption: Disease States and Pharmacology01:25

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Multiple disease states can significantly influence the oral drug absorption process by affecting blood flow and the functionality of the gastrointestinal (GI) system. Various GI diseases, including conditions that alter GI motility, such as diarrhea, decreased acid secretions (achlorhydria), and infections, have been associated with reduced drug absorption.
Substances such as alcohol and specific drugs, including antineoplastics, can also negatively impact drug absorption. For instance,...
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Glomerular Filtration01:15

Glomerular Filtration

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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.
Components of the Filtration Membrane
The filtration process involves three key layers: the glomerular endothelial cells, the basement membrane, and the podocyte-formed filtration slits.
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Glomerular Filtration Rate and its Regulation01:28

Glomerular Filtration Rate and its Regulation

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The Glomerular Filtration Rate (GFR) is a measure of kidney function, reflecting the volume of filtrate formed per minute in the kidneys. On average, GFR is approximately 125 mL/min in males and 105 mL/min in females. Maintaining a relatively constant GFR is essential for the kidneys to effectively regulate body fluid homeostasis and maintain extracellular stability.
GFR regulation involves two primary intrinsic controls: the myogenic and tubuloglomerular feedback mechanisms.
The myogenic...
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Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration01:28

Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration

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Glomerular filtration rate (GFR) can be estimated from serum creatinine using the modification of diet in renal disease (MDRD) formula or the chronic kidney disease–epidemiology collaboration (CKD–EPI) equation. Both methods are widely used in clinical practice to assess kidney function and guide treatment decisions.The MDRD equation does not require weight or height measurements and is normalized to the body surface area of 1.73 m², considered the average adult surface area.
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Glomerular Filtration: Net Filtration Pressure01:26

Glomerular Filtration: Net Filtration Pressure

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Glomerular filtration, a key process in the kidneys, is regulated by three main pressures: Glomerular blood hydrostatic pressure (GBHP), Capsular hydrostatic pressure (CHP), and Blood colloid osmotic pressure (BCOP).
GBHP, with an average value of 55 mmHg, promotes filtration by pushing water and solutes through the filtration membrane. This is balanced by two opposing forces: CHP, a "back pressure" exerted against the filtration membrane by fluid already in the capsular space and renal...
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Related Experiment Video

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Assessment of Kidney Function in Mouse Models of Glomerular Disease
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Hemicentin 1 influences podocyte dynamic changes in glomerular diseases.

Barbara Toffoli1, Cristina Zennaro2, Carine Winkler1

  • 1Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne , Lausanne , Switzerland.

American Journal of Physiology. Renal Physiology
|March 1, 2018
PubMed
Summary

Hemicentin 1 (HMCN1) is identified as an early marker for glomerular damage in diabetic nephropathy. Increased HMCN1 expression correlates with podocyte dysfunction and proteinuric nephropathies, suggesting its potential as a diagnostic indicator.

Keywords:
F-actindiabetic nephropathyfocal segmental glomerulosclerosisglomerular basement membranemicroarray analysis

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Area of Science:

  • Nephrology
  • Molecular Biology
  • Diabetology

Background:

  • Podocyte foot process morphology is crucial for glomerular filtration.
  • Injuries to podocytes lead to glomerular dysfunction and albuminuria.
  • Diabetic nephropathy involves complex mechanisms affecting podocyte integrity.

Purpose of the Study:

  • To identify early molecular markers of glomerular damage in diabetic nephropathy.
  • To investigate the role of hemicentin 1 (HMCN1) in early-stage kidney disease.
  • To explore HMCN1 as a potential biomarker for proteinuric nephropathies.

Main Methods:

  • Microarray analysis in mouse models of diabetic nephropathy (PPARγ-null and AZIP/F1 mice).
  • Real-time PCR and immunofluorescence to study HMCN1 expression and distribution.
  • In vitro studies on murine and human podocytes under various pathological stimuli (hyperglycemia, TGF-β, PA).
  • In vitro silencing studies to assess HMCN1's role in podocyte cytoskeleton rearrangement.

Main Results:

  • Hemicentin 1 (HMCN1) expression significantly increased in early stages of glomerular damage.
  • HMCN1 levels progressively rose in diabetic mice and puromycin aminonucleoside-treated rats.
  • Pathological stimuli like hyperglycemia and TGF-β increased HMCN1 deposition in podocytes.
  • HMCN1 mediated podocyte cytoskeleton rearrangements induced by TGF-β.
  • Elevated HMCN1 expression was observed in human proteinuric nephropathies.

Conclusions:

  • Hemicentin 1 (HMCN1) is a novel molecule involved in dynamic changes of podocyte foot processes.
  • Increased HMCN1 expression is associated with podocyte dysfunction in diabetic nephropathy.
  • HMCN1 serves as a potential early marker for glomerular damage in various proteinuric nephropathies.