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Erschienen in: Basic Research in Cardiology 4/2008

01.06.2008 | ORIGINAL CONTRIBUTION

Reduced MMP-2 activity contributes to cardiac fibrosis in experimental diabetic cardiomyopathy

verfasst von: Sophie Van Linthout, Ute Seeland, Alexander Riad, Oleg Eckhardt, Mathias Hohl, Nasser Dhayat, Utz Richter, Jens W. Fischer, Michael Böhm, Matthias Pauschinger, Heinz-Peter Schultheiss, Carsten Tschöpe, MD

Erschienen in: Basic Research in Cardiology | Ausgabe 4/2008

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Abstract

Objective

To evaluate the regulation of matrix metalloproteinase (MMP)-2 in diabetic cardiomyopathy.

Methods

Left ventricle (LV) function was determined by a micro-tip catheter in streptozotocin (STZ)-induced diabetic rats, 2 or 6 weeks (w) after STZ-application. LV total collagen, collagen type I and III content were immunohistologically analyzed and quantified by digital image analysis. LV collagen type I, III and MMP-2 mRNA expression was quantified by real-time RT-PCR. LV pro- and active MMP-2 levels were analyzed by zymography; Smad 7, membrane type (MT)1-MMP and tissue inhibitor metalloproteinase (TIMP)-2 protein levels by Western Blot.

Results

STZ-induced diabetes was associated with a time-dependent impairment of LV diastolic and systolic function. This was paralleled by a time-dependent increase in LV total collagen content, despite reduced LV collagen type I and III mRNA levels, indicating a role of post-transcriptional/post-translational changes of extracellular matrix regulation. Six weeks (w) after STZ-injection, MMP-2 mRNA expression and pro-MMP-2 levels were 2.7-fold (P < 0.005) and 1.3-fold (P < 0.05) reduced versus controls, respectively, whereas active MMP-2 was decreased to undetectable levels 6 w post-STZ. Concomitantly, Smad 7 and TIMP-2 protein levels were 1.3-fold (P < 0.05) and 10-fold (P < 0.005) increased in diabetics versus controls, respectively, whereas the 45 kDa form of MT1-MMP was undetectable in diabetics.

Conclusion

Under STZ-diabetic conditions, cardiac fibrosis is associated with a dysregulation in extracellular matrix degradation. This condition is featured by reduced MMP-2 activity, concomitant with increased Smad 7 and TIMP-2 and decreased MT1-MMP protein expression, which differs from mechanisms involved in dilated and ischemic heart disease.
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Metadaten
Titel
Reduced MMP-2 activity contributes to cardiac fibrosis in experimental diabetic cardiomyopathy
verfasst von
Sophie Van Linthout
Ute Seeland
Alexander Riad
Oleg Eckhardt
Mathias Hohl
Nasser Dhayat
Utz Richter
Jens W. Fischer
Michael Böhm
Matthias Pauschinger
Heinz-Peter Schultheiss
Carsten Tschöpe, MD
Publikationsdatum
01.06.2008
Verlag
D. Steinkopff-Verlag
Erschienen in
Basic Research in Cardiology / Ausgabe 4/2008
Print ISSN: 0300-8428
Elektronische ISSN: 1435-1803
DOI
https://doi.org/10.1007/s00395-008-0715-2

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