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Related Experiment Videos

Ca(2+)-ATPase protein expression in mammary tissue.

T A Reinhardt1, A G Filoteo, J T Penniston

  • 1Periparturient Diseases of Cattle Research Unit, National Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Ames, Iowa 50010, USA. treinhar@nadc.ars.usda.gov

American Journal of Physiology. Cell Physiology
|October 13, 2000
PubMed
Summary

During lactation, plasma membrane Ca(2+)-ATPase (PMCA) protein expression significantly increases in rat mammary tissue, with a novel splice variant, PMCA2bw, secreted into milk. This suggests a key role for PMCA2bw in calcium regulation during lactation.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Calcium ATPases, including plasma membrane Ca(2+)-ATPases (PMCAs) and secretory pathway Ca(2+)-ATPases (SPCAs), are crucial for cellular calcium homeostasis.
  • Understanding the specific isoforms and their roles in specialized tissues like the mammary gland during lactation is essential for comprehending calcium transport mechanisms.

Purpose of the Study:

  • To investigate the protein expression and localization of PMCAs and SPCAs in rat mammary tissue during lactation.
  • To identify novel splice variants of PMCAs and determine their functional significance in milk production.

Main Methods:

  • Western blotting was used to examine protein expression levels of PMCAs and SPCAs.
  • RT-PCR was employed to analyze alternative splicing of PMCA transcripts.

Related Experiment Videos

  • Immunohistochemistry or similar techniques were likely used to determine protein localization within mammary tissue.

    • Main Results:

    • PMCA protein expression, predominantly PMCA2b, dramatically increased with lactation onset, correlating with milk production.
    • A novel splice variant, PMCA2bw, was identified, characterized by an additional 45 amino acids, and found to be secreted into milk, associated with the milk fat globule membrane.
    • SPCA protein expression increased pre-parturition and continued to rise during lactation, suggesting its involvement in Golgi calcium transport.

    Conclusions:

    • The increased abundance and apical localization of PMCA2bw indicate its significant role in macro-calcium homeostasis in lactating mammary tissue.
    • The expression patterns of SPCA suggest it is a likely candidate for the Golgi Ca(2+)-ATPase in this tissue.