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. 2000 Oct;84(4):431–437. doi: 10.1136/heart.84.4.431

Apoptosis in the skeletal muscle of patients with heart failure: investigation of clinical and biochemical changes

G Vescovo 1, M Volterrani 1, R Zennaro 1, M Sandri 1, C Ceconi 1, R Lorusso 1, R Ferrari 1, G Ambrosio 1, L Dalla 1
PMCID: PMC1729437  PMID: 10995417

Abstract

OBJECTIVE—To investigate the contribution of apoptosis in the development of the skeletal myopathy in chronic heart failure.
DESIGN—The electrophoretic pattern of myosin heavy chains (MHC), fibre cross sectional area, number of in situ nick end labelling (TUNEL) positive apoptotic myocyte nuclei, and the tissue levels of caspase-3, Bcl-2, and ubiquitin were determined in biopsies taken from the vastus lateralis muscle. The study involved nine patients with severe chronic heart failure caused by ischaemic heart disease and hibernating myocardium and five controls.
RESULTS—In chronic heart failure patients the vastus lateralis showed a significant increase of MHC2a and MHC2b and a greater degree of fibre atrophy, as demonstrated by the decreased cross sectional area. There was also an increased number of TUNEL positive apoptotic myocyte nuclei. Tissue concentrations of Bcl-2 were decreased, while those of caspase-3 and ubiquitin were increased. Peak oxygen consumption (VO2) was negatively correlated with the number of TUNEL positive nuclei and the fibre cross sectional area. There was a correlation between the number of apoptotic nuclei and the fibre cross sectional area, but no correlation between myosin heavy chains and number of apoptotic nuclei.
CONCLUSIONS—Myocyte apoptosis occurs in the skeletal muscle of patients with chronic heart failure, and its magnitude is associated with the severity of exercise capacity limitation and the degree of muscle atrophy. Muscle atrophy contributes to the limitation of exercise capacity, together with the increased synthesis of fast, more fatiguable myosin heavy chains.


Keywords: apoptosis; chronic heart failure; exercise capacity; myosin heavy chains

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Figure 1  .

Figure 1  

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(A) TUNEL positive myocyte nucleus. (B) TUNEL positive interstitial nucleus in the vastus lateralis of a patient with chronic heart failure; the interstitial space is stained with laminin. TUNEL, in situ nick end labelling. Bar = 50 µm.

Figure 2  .

Figure 2  

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Representative western blot of Bcl-2 (panel A) and caspase-3 (panel B). Lane 1, control; lanes 2 and 3, chronic heart failure patients.

Figure 3  .

Figure 3  

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Linear regression between number of TUNEL positive myonuclei/mm3 and fibre cross sectional area (expressed as µm2) in the chronic heart failure patients (n = 9, p = 0.05). TUNEL, in situ nick end labelling.

Figure 4  .

Figure 4  

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Linear regression between number of TUNEL positive nuclei/mm3 (total, myocyte, and interstitial) and peak VO2 in the chronic heart failure patients (ml/kg/min) (n = 9; p = 0.03 for total, p = 0.006 for myocyte, and p = 0.08 for interstitial cells).

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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