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Related Experiment Videos

Control of calbindin-D28K expression in developing mouse kidney

J Davies1

  • 1CRC Epithelial Morphogenesis Group, School of Biological Sciences, Victoria University of Manchester, United Kingdom.

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|January 1, 1994
PubMed
Summary

Calbindin-D28K expression in developing kidneys shows distinct patterns. Its presence in collecting ducts is vitamin D independent, while nephron expression requires 1,25-dihydroxy-vitamin D3.

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Area of Science:

  • Developmental Biology
  • Molecular Endocrinology
  • Renal Physiology

Background:

  • Calbindin-D28K is a calcium-binding protein found in specific kidney regions.
  • Its expression patterns during kidney development are not fully understood.
  • Vitamin D metabolites are known regulators of gene expression in the kidney.

Purpose of the Study:

  • To investigate the differential expression and regulation of Calbindin-D28K in developing metanephric and mesonephric kidneys.
  • To determine the role of 1,25-dihydroxy-vitamin D3 [1,25(OH)2D3] in controlling Calbindin-D28K expression during kidney organogenesis.
  • To utilize cultured kidney rudiments as a model system to study tissue-specific gene regulation.

Main Methods:

  • Organotypic culture of developing metanephric and mesonephric kidney rudiments.

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  • Immunohistochemical analysis to detect Calbindin-D28K protein localization.
  • Manipulation of 1,25(OH)2D3 levels in culture media to assess its regulatory effects.

    • Main Results:

    • Calbindin-D28K is expressed in all regions of developing collecting ducts, independent of 1,25(OH)2D3.
    • In developing nephrons, Calbindin-D28K expression is restricted to distal tubule segments and is dependent on 1,25(OH)2D3.
    • Mesonephric Wolffian ducts and their derivatives express calbindin independently of 1,25(OH)2D3, but mesonephric nephrons do not express it.

    Conclusions:

    • Developing kidney expresses Calbindin-D28K with distinct spatial and temporal patterns.
    • 1,25(OH)2D3 plays a critical role in regulating Calbindin-D28K expression in developing nephrons.
    • Cultured kidney rudiments provide a valuable model for dissecting tissue-specific gene regulation in renal development.