N-methylethanolamine attenuates cardiac fibrosis and improves diastolic function: inhibition of phospholipase D as a possible mechanism.

Abstract:

AIM:Ventricular fibrosis is promoted by many effectors that chronically activate phospholipase D (PLD), and induces cardiac dysfunction and heart failure in cardiovascular diseases. Since ethanolamine is a product of PLD, we hypothesised that an administration of an analogue of ethanolamine, N-methylethanolamine (MEA), decreases PLD activity through a negative feedback mechanism, suppresses collagen accumulation, and thus prevents organ dysfunction. METHODS AND RESULTS:In human fibroblasts 1-butanol inhibited collagen synthesis and enhanced collagenase production, but iso-butanol did not. These indicate crucial roles of PLD in collagen synthesis and degradation. In fibroblasts, MEA dose-dependently decreased PLD activity, inhibited collagen synthesis and enhanced collagenase production. In a hypertensive heart failure model using Dahl-Iwai salt-sensitive rats, PLD activity increased with progressive ventricular fibrosis, leading to myocardial stiffening and overt heart failure. Long-term administration of MEA did not significantly decrease blood pressure, however, but decreased PLD activity and collagen content with inhibited gene expression of collagens, leading to the prevention of myocardial stiffening and haemodynamic deterioration. MEA also attenuated ventricular hypertrophy, another detrimental structural alteration. CONCLUSION:MEA may exert therapeutic effects on cardiac disorders due to ventricular fibrosis through suppression of PLD activity and modulation of the fibrosis pathway even without relief from mechanical stress.

journal_name

Eur Heart J

journal_title

European heart journal

authors

Yamamoto K,Takahashi Y,Mano T,Sakata Y,Nishikawa N,Yoshida J,Oishi Y,Hori M,Miwa T,Inoue S,Masuyama T

doi

10.1016/j.ehj.2004.05.003

subject

Has Abstract

pub_date

2004-07-01 00:00:00

pages

1221-9

issue

14

eissn

0195-668X

issn

1522-9645

pii

S0195668X04003112

journal_volume

25

pub_type

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