Related Experiment Video

Updated: Jul 5, 2026

Analyzing Beneficial Effects of Nutritional Supplements on Intestinal Epithelial Barrier Functions During Experimental Colitis
08:58

Analyzing Beneficial Effects of Nutritional Supplements on Intestinal Epithelial Barrier Functions During Experimental Colitis

Published on: January 5, 2017

Regulation of electrolyte transport with IL-1beta in rabbit distal colon

F R Homaidan1, H Desai, L Zhao

  • 1Division of Gastroenterology and Nutrition Winthrop-University Hospital Mineola NY 11501 USA.

Mediators of Inflammation
|January 1, 1995
PubMed

Insights

Interleukin-1beta elevates electrolyte transport in the colon via protein synthesis and prostaglandin E2. This mechanism is crucial for understanding inflammatory bowel disease (IBD) pathophysiology.

Area of Science:

  • Gastroenterology
  • Molecular Biology
  • Physiology

Background:

  • Elevated interleukin-1beta (IL-1β) levels are observed in inflammatory bowel disease (IBD).
  • The precise mechanisms by which IL-1β influences intestinal electrolyte transport remain incompletely understood.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying interleukin-1beta's effect on electrolyte transport in the rabbit distal colon.
  • To elucidate the role of protein synthesis and prostaglandin E2 in IL-1β-mediated responses.

Main Methods:

  • Measurement of short-circuit current (I(sc)) in rabbit distal colon.
  • Inhibition studies using cycloheximide, amiloride, and bumetanide.
  • Assessment of chloride-free buffer conditions.
  • Quantification of prostaglandin E2 (PGE2) levels.

Main Results:

  • Interleukin-1beta induced a delayed increase in I(sc), dependent on protein synthesis (inhibited by cycloheximide).
  • The IL-1β effect on I(sc) was independent of amiloride but sensitive to bumetanide and chloride removal, indicating chloride secretion.
  • Interleukin-1beta significantly increased PGE2 levels, an effect reversed by cycloheximide.
  • Indomethacin treatment inhibited the IL-1β-induced increase in I(sc).

Conclusions:

  • Interleukin-1beta stimulates chloride secretion in the rabbit distal colon through a prostaglandin E2-mediated pathway.
  • The process involves de novo protein synthesis and suggests a role for a second messenger.
  • These findings provide insights into the pathophysiology of IBD and potential therapeutic targets.

More Related Videos

Two-dimensional Porcine Intestinal Organoids Reflecting the Physiological Properties of Native Gut09:13

Two-dimensional Porcine Intestinal Organoids Reflecting the Physiological Properties of Native Gut

Published on: January 31, 2025

Implementing Patch Clamp and Live Fluorescence Microscopy to Monitor Functional Properties of Freshly Isolated PKD Epithelium08:46

Implementing Patch Clamp and Live Fluorescence Microscopy to Monitor Functional Properties of Freshly Isolated PKD Epithelium

Published on: September 1, 2015

Related Concept Videos

Physiology of the Genitourinary System II: Tubular Reabsorption and Secretion01:22

Physiology of the Genitourinary System II: Tubular Reabsorption and Secretion

The kidneys maintain homeostasis through filtration, reabsorption, and secretion. Tubular reabsorption and secretion are crucial in forming urine and regulating electrolytes, water balance, and waste elimination.Tubular Reabsorption and Secretion ProcessesTubular reabsorption is the process that reclaims essential substances such as electrolytes, glucose, amino acids, and water from the glomerular filtrate back into the bloodstream. This is achieved through passive and active transport...
Reabsorption and Secretion in the Loop of Henle01:17

Reabsorption and Secretion in the Loop of Henle

The thick ascending limb of the nephron loop has Na+–K+–2Cl− symporters in the apical membranes of its cells. These symporters simultaneously reclaim one sodium ion, one potassium ion, and two chloride ions from the tubular fluid. Sodium ions are actively transported into the interstitial fluid at the base and sides of the cell, diffusing into the vasa recta. Chloride ions move through leakage channels in the basolateral membrane into the interstitial fluid and then into the vasa recta.
Reabsorption and Secretion in the DCT and Collecting Duct01:26

Reabsorption and Secretion in the DCT and Collecting Duct

The early phase of the DCT manages the reabsorption of approximately 10-15% of filtered water, 5–10% of filtered sodium, and 5–10% of filtered chloride. This process is facilitated by Na+–Cl− symporters in apical membranes and sodium-potassium pumps, as well as Cl− leakage channels in basolateral membranes. The early DCT also stands out as a site where parathyroid hormone (PTH) stimulates calcium reabsorption, depending on the body's requirements.
The distal part of the DCT, along with the...
Renewal of Intestinal Stem Cells01:23

Renewal of Intestinal Stem Cells

The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the goblet,...
Inflammatory Bowel Disease II: Ulcerative Colitis01:20

Inflammatory Bowel Disease II: Ulcerative Colitis

Ulcerative colitis is a chronic inflammatory disorder of the colon characterized by continuous mucosal inflammation that typically begins in the rectum and extends proximally in a uniform pattern. Its pathogenesis involves a complex interplay of genetic predisposition, immune dysregulation, and environmental influences. These factors converge to impair the colon’s epithelial defenses and promote an exaggerated inflammatory response against luminal contents.Breakdown of the Mucosal BarrierA...
Renal Regulation of Acid-Base Balance01:29

Renal Regulation of Acid-Base Balance

Metabolic reactions in the body produce nonvolatile acids, such as sulfuric acid, which generate an acid load of approximately 1 mEq of H+ per kilogram of body weight daily. Excreting H+ in the urine is essential to balance this acid load.
In the kidneys, cells within the proximal convoluted tubules (PCT) and the collecting ducts secrete hydrogen ions (H+) into the tubular fluid. Specifically, in the PCT, Na+/H+ antiporters secrete H+ while reabsorbing Na+.
However, the intercalated cells in...