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Related Concept Videos

Nephrons01:10

Nephrons

The kidneys are intricate organs with millions of working units known as nephrons. Each nephron features two major structures: the renal corpuscle, which facilitates blood plasma filtration, and the renal tubule, which handles the glomerular filtrate. Blood supply is directly linked to the nephrons. The renal corpuscle consists of the glomerulus, a capillary network, and the Bowman's capsule, a double-walled epithelial structure that encases the glomerulus. The filtering of blood plasma happens...
Renal Corpuscle01:20

Renal Corpuscle

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
The glomerulus is a tiny, intricate network of capillaries located at the beginning of the nephron. It's enveloped by the Bowman's capsule and receives its blood supply from an afferent arteriole, which divides into numerous capillaries...
Kidney Structure01:45

Kidney Structure

The kidneys are two large bean-shaped organs located in the upper abdomen. They filter the blood several times a day to remove toxins and rebalance water and electrolytes of the circulatory system via the renal veins. The kidneys receive blood directly from the heart via the renal arteries. These arteries enter the kidney at the hilum, the concave surface of the bean, where they branch and divide into smaller vessels and capillaries.
Renal Tubule and Collecting Duct01:24

Renal Tubule and Collecting Duct

The renal tubule is divided into three parts: the proximal convoluted tubule (PCT), the Loop of Henle (LOH), and the distal convoluted tubule (DCT).
Proximal Convoluted Tubule (PCT):
The PCT is the initial segment of the renal tubule, extending from the Bowman's capsule that encloses the glomerulus. Its convoluted structure and microvilli-lined cells increase the surface area for reabsorption. The PCT reabsorbs glucose, amino acids, sodium, and water from the filtrate, ensuring essential...
Renal Drug Excretion: Overview01:15

Renal Drug Excretion: Overview

As primary excretory organs, the kidneys maintain homeostasis by removing waste substances from the bloodstream. They comprise over a million units called nephrons, which serve as the kidney's functional units.
A nephron consists of two primary structures: the renal corpuscle and the renal tubule. The renal corpuscle contains the glomerulus, a network of capillaries where the first step of renal excretion, glomerular filtration, occurs. Blood pressure forces water, ions, and small molecules out...
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...

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Related Experiment Video

Updated: Jun 16, 2026

Implementing Patch Clamp and Live Fluorescence Microscopy to Monitor Functional Properties of Freshly Isolated PKD Epithelium
08:46

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

Published on: September 1, 2015

Connexins and the kidney.

Fiona Hanner1, Charlotte Mehlin Sorensen, Niels-Henrik Holstein-Rathlou

  • 1Department of Physiology and Biophysics, Zilkha Neurogenetic Institute, University of Southern California, 1501 San Pablo St., Los Angeles, CA 90033, USA.

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
|February 19, 2010
PubMed
Summary

Connexins (Cxs) are vital proteins in the kidney, facilitating intercellular communication. Understanding their roles in renal function is key to addressing conditions like hypertension and diabetes.

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Last Updated: Jun 16, 2026

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Area of Science:

  • Renal physiology
  • Cellular biology
  • Molecular medicine

Background:

  • Connexins (Cxs) form gap junctions, crucial for cell-to-cell communication in most organs.
  • Specific connexins (Cx37, Cx40, Cx43, Cx45) are expressed in the renal vasculature, with Cx40 dominant in endothelial cells and Cx45 in smooth muscle.
  • Connexins in renal tubules are less understood, with evidence for gap junctions in proximal tubules and Cx30, Cx30.3, Cx37 in the distal nephron.

Purpose of the Study:

  • To review the expression and function of connexins in the kidney.
  • To elucidate the role of renal connexins in vascular and tubular signaling pathways.
  • To explore the implications of connexin function in kidney diseases such as hypertension and diabetes.

Main Methods:

  • Literature review of studies on connexin expression and function in the kidney.
  • Analysis of existing data on connexin roles in renal vasculature and tubules.
  • Synthesis of evidence linking renal connexins to physiological regulatory mechanisms.

Main Results:

  • Renal connexins are essential for vascular conduction and calcium signaling in the juxtaglomerular apparatus.
  • They play a role in tubular purinergic signaling and may form functional gap junctions or hemichannels.
  • Evidence suggests involvement in the renin-angiotensin system, tubuloglomerular feedback, and salt/water reabsorption.

Conclusions:

  • Renal connexins are critical for kidney function, impacting blood pressure regulation.
  • Dysregulation of connexins may contribute to the pathogenesis of hypertension and diabetes.
  • Further research into renal connexins is warranted for therapeutic strategies.