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PTH, chronic renal failure and myocardium

M Smogorzewski1

  • 1Department of Medicine, University of Southern California, School of Medicine, Los Angeles 90033, USA.

Mineral and Electrolyte Metabolism
|January 1, 1995
PubMed
Summary

Parathyroid hormone (PTH) increases calcium in heart cells, potentially harming the heart in chronic renal failure (CRF). This study reveals how PTH affects cardiac myocytes and contributes to CRF-related heart issues.

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Area of Science:

  • Cardiovascular Physiology
  • Endocrinology
  • Nephrology

Background:

  • The heart is a target organ for parathyroid hormone (PTH).
  • PTH action on the myocardium may involve increasing cytosolic calcium ([Ca2+]i) in myocardial cells.
  • This property of PTH might explain the rise in [Ca2+]i observed in chronic renal failure (CRF).

Purpose of the Study:

  • To investigate the effects of PTH on cardiac myocyte calcium levels.
  • To determine the mechanisms underlying PTH-induced calcium changes.
  • To examine the role of PTH in elevated [Ca2+]i in cardiac myocytes during CRF.

Main Methods:

  • Studied the direct effects of PTH on isolated cardiac myocytes.
  • Investigated receptor-mediated signaling pathways, including G proteins and L-type calcium channels.
  • Assessed calcium dynamics, including entry, release from sarcoplasmic reticulum, and exit from myocytes.

Main Results:

  • PTH was shown to increase [Ca2+]i in cardiac myocytes via a receptor-mediated mechanism involving G protein activation and L-type calcium channels.
  • The rise in [Ca2+]i resulted from both increased calcium influx and calcium-induced calcium release from the sarcoplasmic reticulum.
  • CRF was associated with significantly elevated basal [Ca2+]i in cardiac myocytes, mediated by secondary hyperparathyroidism.
  • Excess PTH in CRF increases myocyte calcium entry and decreases calcium exit.

Conclusions:

  • PTH directly increases intracellular calcium in cardiac myocytes through specific signaling pathways.
  • Elevated PTH levels in CRF contribute to increased cardiac myocyte calcium, potentially leading to cardiac dysfunction.
  • Understanding these mechanisms is crucial for managing cardiovascular complications in CRF patients.

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