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Cardiomyopathy IV: Restrictive Cardiomyopathy01:29

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Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...

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Cardiac defects and altered ryanodine receptor function in mice lacking FKBP12

W Shou1, B Aghdasi, D L Armstrong

  • 1Department of Pathology, Baylor College of Medicine, Houston, Texas 77030, USA.

Nature
|February 14, 1998
PubMed
Summary

FKBP12 protein deficiency causes severe heart defects and neural tube closure issues in mice. This study reveals FKBP12 modulates calcium release in muscle and heart ryanodine receptors, but is not essential for TGF-beta signaling.

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Area of Science:

  • Molecular biology
  • Cardiovascular research
  • Developmental biology

Background:

  • FKBP12 is a ubiquitous protein binding FK506 and rapamycin, interacting with TGF-beta receptors and ryanodine receptors (RyRs).
  • The in vivo function of FKBP12, particularly its role in TGF-beta signaling and RyR modulation, remains controversial.

Purpose of the Study:

  • To elucidate the in vivo functions of FKBP12 by generating and characterizing FKBP12-deficient mice.
  • To investigate FKBP12's role in TGF-beta signaling pathways.
  • To determine FKBP12's impact on the function of skeletal (RyR1) and cardiac (RyR2) ryanodine receptors.

Main Methods:

  • Generation of FKBP12-deficient mice using embryonic stem (ES) cell technology.
  • Phenotypic analysis of FKBP12-deficient mice, including skeletal muscle, cardiac function, and neural development.
  • Physiological studies to assess TGF-beta signaling and ryanodine receptor calcium release activity.

Main Results:

  • FKBP12-deficient mice exhibit severe dilated cardiomyopathy and ventricular septal defects, mimicking human noncompaction of left ventricular myocardium.
  • Approximately 9% of FKBP12-deficient mutants display exencephaly due to neural tube closure defects.
  • Physiological data indicate FKBP12 is dispensable for TGF-beta signaling but crucial for modulating calcium release by both RyR1 and RyR2.

Conclusions:

  • FKBP12 plays a critical role in cardiac development and function, with its absence leading to significant heart malformations.
  • FKBP12 is essential for proper neural tube closure.
  • FKBP12's primary in vivo function involves regulating the calcium release activity of ryanodine receptors, rather than mediating TGF-beta signaling.