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Related Concept Videos

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
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Renal Corpuscle01:20

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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.
Glomerulus: Structure and Function
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Glomerular Filtration Rate and its Regulation01:28

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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.
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Dialysis01:27

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Renal failure occurs when the kidneys lose their ability to filter waste products from the blood effectively. It can be classified into two types: acute renal failure (ARF) and chronic renal failure (CRF).
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G-protein Coupled Receptors01:21

G-protein Coupled Receptors

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G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
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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).
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Inflammatory depression is associated with selective glomerular hypofiltration.

Gustav Söderberg Veibäck1, Linnea Malmgren2, Marie Asp3

  • 1Unit for Biological and Precision Psychiatry, Department of Clinical Sciences Lund, Lund University, Sweden; Department of Gastroenterology and Nutrition, Department of Clinical Sciences Skåne University Hospital, Malmö, Sweden.

Journal of Affective Disorders
|April 4, 2024
PubMed
Summary

Selective Glomerular Hypofiltration Syndromes (SGHS) were more common in patients with difficult-to-treat depression. This suggests SGHS may be a mechanism in inflammatory depression, potentially offering new therapeutic targets.

Keywords:
Cystatin CDepressionGlomerular filtration rateInflammation

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Area of Science:

  • Nephrology
  • Psychiatry
  • Immunology

Background:

  • Systemic low-grade inflammation is implicated in a subtype of depression.
  • Selective Glomerular Hypofiltration Syndromes (SGHS) involve reduced estimated glomerular filtration rate (eGFR) based on cystatin C (cysC) relative to eGFR based on creatinine (crea).
  • SGHS are linked to elevated pro-inflammatory markers but unstudied in depression.

Purpose of the Study:

  • To investigate SGHS as a potential mechanism in inflammatory depression.
  • To compare SGHS prevalence in difficult-to-treat depression patients versus controls.
  • To explore the relationship between SGHS, inflammation, and depression severity.

Main Methods:

  • Compared SGHS prevalence in 313 depressed patients and 73 controls using various eGFRcysC/eGFRcrea ratios.
  • Assessed plasma inflammatory markers (TNF-α, IFN-γ, IL-6, IL-8, IL-10) in 276 depressed patients.
  • Examined IL-6 mediation of the SGHS-depression link.

Main Results:

  • Depressed patients showed higher SGHS prevalence (33.2% vs 20.5% for ratio <0.9; 15.7% vs 5.5% for ratio <0.8).
  • Lower eGFRcysC/eGFRcrea ratios correlated with increased inflammatory markers in depressed individuals.
  • Interleukin-6 (IL-6) partially mediated the association between SGHS and depression.

Conclusions:

  • This study first links SGHS to inflammatory depression.
  • SGHS may represent a relevant pathophysiological mechanism in certain depression cases.
  • Further research in independent cohorts could validate SGHS as a therapeutic target for depression.