Clinical significance of cathepsin L and cathepsin B in dilated cardiomyopathy

Dysregulated expression of lysosomal cysteine cathepsins is associated with adverse cardiac remodeling, a characteristic of several cardiovascular diseases. However, the information regarding the role of cysteine cathepsin L (CTSL) and cathepsin B (CTSB) in dilated cardiomyopathy (DCM) is limited. T...

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Veröffentlicht in:Molecular and cellular biochemistry 2017-04, Vol.428 (1-2), p.139-147
Hauptverfasser: Mehra, Siddharth, Kumar, Manish, Manchanda, Mansi, Singh, Ratnakar, Thakur, Bhaskar, Rani, Neha, Arava, Sudheer, Narang, Rajiv, Arya, Dharamvir Singh, Chauhan, Shyam S.
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container_end_page 147
container_issue 1-2
container_start_page 139
container_title Molecular and cellular biochemistry
container_volume 428
creator Mehra, Siddharth
Kumar, Manish
Manchanda, Mansi
Singh, Ratnakar
Thakur, Bhaskar
Rani, Neha
Arava, Sudheer
Narang, Rajiv
Arya, Dharamvir Singh
Chauhan, Shyam S.
description Dysregulated expression of lysosomal cysteine cathepsins is associated with adverse cardiac remodeling, a characteristic of several cardiovascular diseases. However, the information regarding the role of cysteine cathepsin L (CTSL) and cathepsin B (CTSB) in dilated cardiomyopathy (DCM) is limited. The present study was aimed to investigate the expression of CTSL and CTSB in animal model of doxorubicin (doxo)-induced cardiomyopathy as well as in peripheral blood samples of DCM patients. Cardiac tissue sections from doxo-treated and control rats were used to study the expression of CTSL and CTSB by enzyme assay and immunohistochemistry (IHC). Peripheral blood mononuclear cells (PBMCs) isolated from DCM patients ( n  = 29) along with age-matched healthy controls ( n  = 28) were used to assay enzymatic activity of these cathepsins. Activities of these proteases were further correlated with echocardiographic parameters of DCM patients. A significant increase in CTSL activity and protein expression was observed with no changes in CTSB levels in doxo-treated rats as compared to controls. We also observed a drastic increase in the functional activity of cathepsin L+cathepsin B (CTSL+B), CTSL, and CTSB in DCM patients compared to controls ( p  ≤ 0.001). Increased levels of these proteases exhibited a statistically significant correlation with reduced left ventricular ejection fraction (LVEF) in DCM patients ( ρ  = −0.58, p  = 0.01). For the first time, this study demonstrates a correlation between increased expression of CTSL and CTSB in PBMCs with severity of left ventricular dysfunction in DCM patients. Thus, these proteases may serve as blood-based biomarker of DCM and prove useful in its management.
doi_str_mv 10.1007/s11010-016-2924-6
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However, the information regarding the role of cysteine cathepsin L (CTSL) and cathepsin B (CTSB) in dilated cardiomyopathy (DCM) is limited. The present study was aimed to investigate the expression of CTSL and CTSB in animal model of doxorubicin (doxo)-induced cardiomyopathy as well as in peripheral blood samples of DCM patients. Cardiac tissue sections from doxo-treated and control rats were used to study the expression of CTSL and CTSB by enzyme assay and immunohistochemistry (IHC). Peripheral blood mononuclear cells (PBMCs) isolated from DCM patients ( n  = 29) along with age-matched healthy controls ( n  = 28) were used to assay enzymatic activity of these cathepsins. Activities of these proteases were further correlated with echocardiographic parameters of DCM patients. A significant increase in CTSL activity and protein expression was observed with no changes in CTSB levels in doxo-treated rats as compared to controls. We also observed a drastic increase in the functional activity of cathepsin L+cathepsin B (CTSL+B), CTSL, and CTSB in DCM patients compared to controls ( p  ≤ 0.001). Increased levels of these proteases exhibited a statistically significant correlation with reduced left ventricular ejection fraction (LVEF) in DCM patients ( ρ  = −0.58, p  = 0.01). For the first time, this study demonstrates a correlation between increased expression of CTSL and CTSB in PBMCs with severity of left ventricular dysfunction in DCM patients. 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source MEDLINE; SpringerLink Journals - AutoHoldings
subjects Adult
Animal models
Animals
Anthracyclines
Biochemistry
Biomarkers
Biomarkers - blood
Biomedical and Life Sciences
Cardiology
Cardiomyopathy
Cardiomyopathy, Dilated - chemically induced
Cardiomyopathy, Dilated - metabolism
Cardiomyopathy, Dilated - physiopathology
Cardiovascular diseases
Cathepsin B - blood
Cathepsin L - blood
Cathepsins
Congestive cardiomyopathy
Cysteine
Disease Models, Animal
Doxorubicin - adverse effects
Echocardiography
Enzymatic activity
Enzymes
Female
Heart Ventricles - physiopathology
Humans
Immunohistochemistry
Life Sciences
Male
Medical Biochemistry
Middle Aged
Oncology
Protein expression
Rats
Stroke Volume
Up-Regulation
title Clinical significance of cathepsin L and cathepsin B in dilated cardiomyopathy
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