Associations between N-terminal procollagen type III, fibrosis and echocardiographic indices in dogs that died due to myxomatous mitral valve disease.

Abstract

OBJECTIVES:

To evaluate associations between N-terminal procollagen type III (PIIINP), a serum biomarker of collagen biosynthesis, and myocardial fibrosis in dogs with naturally-occurring myxomatous mitral valve disease (MMVD).

ANIMALS:

Twenty-two dogs with echocardiographically-confirmed MMVD were prospectively recruited from a hospital population. All died as a result of MMVD and their hearts were available for post mortem examination.

METHODS:

Echocardiographic measurements and serum PIIINP concentrations were obtained from all dogs prior to death or euthanasia. Serum PIIINP concentrations (μg/mL) were measured using a validated commercially available radioimmunoassay. Myocardial tissue samples were collected post mortem and myocardial fibrosis was scored. The average fibrosis score for all cardiac sites in the heart was designated the global fibrosis score (GFS). The average fibrosis score for all papillary muscle sites was designated the papillary fibrosis score (PFS). Univariate and multivariate linear regression analyses were used separately to evaluate associations between GFS and PFS, respectively, and PIIINP and echocardiographic variables.

RESULTS:

Left ventricular end-diastolic diameter normalized for body weight (LVEDDN) and PIIINP were weakly independently positively associated with both GFS and PFS. LVEDDN and PIIINP were weakly negatively correlated.

CONCLUSIONS:

Both LVEDDN and serum PIIINP increase with increasing fibrosis score, although these relationships were not strong enough to be clinically useful. Although LVEDDN and PIIINP were positively correlated with fibrosis, PIIINP decreased with increasing LVEDDN, suggesting a complex interplay between fibrosis and remodeling in MMVD.

• Authors: Melanie J Hezzell, Torkel Falk, Lisbeth Høier Olsen, Adrian Boswood, Jonathan Elliott
• Journal: Journal of veterinary cardiology : the official journal of the European Society of Veterinary Cardiology (J Vet Cardiol) Vol. 16 Issue 4 Pg. 257-64 (Dec 2014) ISSN: 1875-0834 [Electronic] Netherlands
• PMID: 25292459 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2014 Elsevier B.V. All rights reserved.

Chemical References

• Peptide Fragments
• Procollagen
• procollagen Type III-N-terminal peptide

Topics

• Animals
• Dog Diseases (metabolism, pathology)
• Dogs
• Echocardiography
• Female
• Fibrosis (pathology, veterinary)
• Linear Models
• Male
• Mitral Valve Prolapse (metabolism, pathology, veterinary)
• Peptide Fragments (genetics, metabolism)
• Procollagen (genetics, metabolism)
• Ventricular Function, Left