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Related Concept Videos

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Nuclear Localization Signals and Import

Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of  2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
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Related Experiment Video

Updated: Jun 16, 2026

Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting
10:08

Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting

Published on: December 9, 2022

Localization and functional characterization of the human NKCC2 isoforms.

I Carota1, F Theilig, M Oppermann

  • 1Institute of Physiology, University of Regensburg, Germany.

Acta Physiologica (Oxford, England)
|February 12, 2010
PubMed
Summary
This summary is machine-generated.

Human kidney cells utilize the Na(+)/K(+)/2Cl(-) cotransporter NKCC2 for salt reabsorption. Differential splicing of NKCC2 generates distinct isoforms, with NKCC2A being dominant in humans and exhibiting lower chloride affinity.

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Last Updated: Jun 16, 2026

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Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes

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Area of Science:

  • Nephrology
  • Molecular Biology
  • Physiology

Background:

  • Salt reabsorption in the thick ascending limb (TAL) of Henle is crucial for kidney function.
  • The Na(+)/K(+)/2Cl(-) cotransporter 2 (NKCC2) mediates apical salt transport in the TAL.
  • Three human NKCC2 splice variants (NKCC2B, NKCC2A, NKCC2F) exist, with varying localization and transport properties.

Purpose of the Study:

  • To investigate the localization and transport characteristics of human NKCC2 isoforms.
  • To compare human NKCC2 isoform expression and function with those found in rodents.
  • To understand the role of differential splicing in diversifying NKCC2 transporter function.

Main Methods:

  • Reverse transcription-polymerase chain reaction (RT-PCR) to detect NKCC2 variants.
  • In situ hybridization to determine the localization of NKCC2 isoforms in kidney tissue.
  • Uptake studies in Xenopus oocytes to assess the transport characteristics, including ion affinity and drug inhibition.

Main Results:

  • All three classical human NKCC2 isoforms and novel variants with duplicated exon 4 were detected in the kidney.
  • NKCC2A was the dominant isoform in humans, unlike rodents where NKCC2F predominates.
  • Human NKCC2A exhibited lower chloride affinity compared to NKCC2B and NKCC2F, and all isoforms were more sensitive to bumetanide than furosemide.

Conclusions:

  • Differential splicing of the NKCC2 gene in humans leads to functional diversification of the transporter.
  • The dominance of NKCC2A in humans suggests species-specific regulation of salt reabsorption in the TAL.
  • Understanding human NKCC2 isoform function is critical for comprehending kidney physiology and potential therapeutic targets.