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Tight junctions are molecular seals between cells that prevent the leaking of fluids, ions, and other small solutes across cavities and compartments in multicellular organisms. They are mainly composed of claudin and occludin transmembrane proteins, and other proteins such as tricellulin and JAM (junctional adhesion molecule). All these proteins are 4-pass transmembrane proteins, except JAM, which is a single-pass transmembrane protein belonging to the immunoglobulin superfamily. The...
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Peritoneal dialysis (PD) is a procedure that facilitates the exchange of solutes, waste products, electrolytes, and excess fluid between the blood in the peritoneal capillaries and a dialysis solution introduced into the peritoneal cavity.Principles of Peritoneal Dialysis (PD)Diffusion: Waste products such as urea and electrolytes move from high concentrations in the blood to low concentrations in the dialysate across the peritoneal membrane. This mechanism is driven by the concentration...
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Peritoneal dialysis (PD) is a medical process that removes waste products and excess fluid from the body using the peritoneal membrane as a natural filter.Peritoneal Dialysis MethodsSeveral methods can be used for peritoneal dialysis, including Acute Intermittent Peritoneal Dialysis, Continuous Ambulatory Peritoneal Dialysis, and Automated Peritoneal Dialysis, also known as Continuous Cyclic Peritoneal Dialysis.Acute Intermittent Peritoneal Dialysis (AIPD) is used for patients with uremic...
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Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
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Surgical Techniques for Catheter Placement and 5/6 Nephrectomy in Murine Models of Peritoneal Dialysis
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Tight junction protein expression from peritoneal dialysis Effluent.

Sua Kim1, Eun Young Choi2, Chor Ho Jo1

  • 1Institute of Biomedical Science, Hanyang University College of Medicine, Seoul, Korea.

Renal Failure
|November 15, 2019
PubMed
Summary

Tight junction proteins, like occludin and claudins, were detected in peritoneal dialysis effluent. Their levels correlate with peritoneal transport function, suggesting potential as novel biomarkers for dialysis patients.

Keywords:
Claudinimmunoblottingoccludinperitoneal dialysistight junction

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Area of Science:

  • Nephrology
  • Cell Biology
  • Biochemistry

Background:

  • Tight junction (TJ) proteins regulate paracellular transport in peritoneal dialysis (PD).
  • Previous studies relied on cultured cells; this study examines TJ proteins directly in PD effluent.
  • Investigates the presence and functional relevance of TJ proteins in PD patients.

Purpose of the Study:

  • To determine if TJ proteins (occludin, ZO-1, claudins) are present in PD effluent.
  • To assess the association between TJ protein expression and PD functional parameters.
  • To explore the utility of PD effluent TJ proteins as biomarkers.

Main Methods:

  • Collected PD effluents from 40 PD patients post-peritoneal equilibration test (PET).
  • Concentrated and purified proteins using Amicon Ultra-15 Centrifugal Filter Units.
  • Performed immunoblot analyses for occludin, ZO-1, and claudins; correlated findings with PET results and creatinine clearance.

Main Results:

  • Occludin, ZO-1, claudin-1, and claudin-15 were detected in all patient effluents.
  • Claudin-1 expression inversely correlated with peritoneal creatinine clearance (p=0.019).
  • Occludin and claudin-15 levels correlated with 4-hour PET results (p=0.011 and p=0.012, respectively).

Conclusions:

  • Peritoneal TJ protein expression can be measured from PD dialysis effluent.
  • TJ protein levels in effluent may serve as novel biomarkers for assessing peritoneal function in PD patients.