Peptidyl-Prolyl Isomerase 1 Regulates Ca 2+ Handling by Modulating Sarco(Endo)Plasmic Reticulum Calcium ATPase and Na 2+/Ca 2+ Exchanger 1 Protein Levels and Function

J Am Heart Assoc. 2017 Oct 10;6(10):e006837. doi: 10.1161/JAHA.117.006837.


Background: Aberrant Ca2+ handling is a prominent feature of heart failure. Elucidation of the molecular mechanisms responsible for aberrant Ca2+ handling is essential for the development of strategies to blunt pathological changes in calcium dynamics. The peptidyl-prolyl cis-trans isomerase peptidyl-prolyl isomerase 1 (Pin1) is a critical mediator of myocardial hypertrophy development and cardiac progenitor cell cycle. However, the influence of Pin1 on calcium cycling regulation has not been explored. On the basis of these findings, the aim of this study is to define Pin1 as a novel modulator of Ca2+ handling, with implications for improving myocardial contractility and potential for ameliorating development of heart failure.

Methods and results: Pin1 gene deletion or pharmacological inhibition delays cytosolic Ca2+ decay in isolated cardiomyocytes. Paradoxically, reduced Pin1 activity correlates with increased sarco(endo)plasmic reticulum calcium ATPase (SERCA2a) and Na2+/Ca2+ exchanger 1 protein levels. However, SERCA2a ATPase activity and calcium reuptake were reduced in sarcoplasmic reticulum membranes isolated from Pin1-deficient hearts, suggesting that Pin1 influences SERCA2a function. SERCA2a and Na2+/Ca2+ exchanger 1 associated with Pin1, as revealed by proximity ligation assay in myocardial tissue sections, indicating that regulation of Ca2+ handling within cardiomyocytes is likely influenced through Pin1 interaction with SERCA2a and Na2+/Ca2+ exchanger 1 proteins.

Conclusions: Pin1 serves as a modulator of SERCA2a and Na2+/Ca2+ exchanger 1 Ca2+ handling proteins, with loss of function resulting in impaired cardiomyocyte relaxation, setting the stage for subsequent investigations to assess Pin1 dysregulation and modulation in the progression of heart failure.

Keywords: Na+/Ca2+ exchange; cardiomyocyte; peptidyl‐prolyl isomerase 1; sarcoplasmic reticulum Ca2+‐ATPase.

MeSH terms

  • Animals
  • Calcium / metabolism*
  • Calcium Signaling*
  • Heart Failure / enzymology*
  • Heart Failure / genetics
  • Heart Failure / physiopathology
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Myocardial Contraction
  • Myocytes, Cardiac / enzymology*
  • NIMA-Interacting Peptidylprolyl Isomerase / deficiency
  • NIMA-Interacting Peptidylprolyl Isomerase / genetics
  • NIMA-Interacting Peptidylprolyl Isomerase / metabolism*
  • Protein Binding
  • Sarcoplasmic Reticulum / enzymology*
  • Sarcoplasmic Reticulum Calcium-Transporting ATPases / metabolism*
  • Sodium-Calcium Exchanger / metabolism*
  • Time Factors


  • NIMA-Interacting Peptidylprolyl Isomerase
  • Sodium-Calcium Exchanger
  • sodium-calcium exchanger 1
  • Sarcoplasmic Reticulum Calcium-Transporting ATPases
  • Pin1 protein, mouse
  • Atp2a2 protein, mouse
  • Calcium