Mechanistic insight of platelet apoptosis leading to non-surgical bleeding among heart failure patients supported by continuous-flow left ventricular assist devices View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2017-03-25

AUTHORS

Nandan K. Mondal, Tieluo Li, Zengsheng Chen, Hegang H. Chen, Erik N. Sorensen, Si M. Pham, Michael A. Sobieski, Steven C. Koenig, Mark S. Slaughter, Bartley P. Griffith, Zhongjun J. Wu

ABSTRACT

Non-surgical bleeding (NSB) is the most common clinical complication in heart failure (HF) patients supported by continuous-flow left ventricular assist devices (CF-LVADs). In this study, oxidative stress and alteration of signal pathways leading to platelet apoptosis were investigated. Thirty-one HF patients supported by CF-LVADs were divided into bleeder (n = 12) and non-bleeder (n = 19) groups. Multiple blood samples were collected at pre-implant (baseline) and weekly up to 1-month post-implant. A single blood sample was collected from healthy subjects (reference). Production of reactive oxygen species (ROS) in platelets, total antioxidant capacity (TAC), oxidized low-density lipoproteins (oxLDL), expression of Bcl-2 and Bcl-xL, Bax and release of cytochrome c (Cyt.c), platelet mitochondrial membrane potential (Δψm), activation of caspases, gelsolin cleavage and platelet apoptosis were examined. Significantly elevated ROS, oxLDL and depleted TAC were evident in the bleeder group compared to non-bleeder group (p < 0.05). Platelet pro-survival proteins (Bcl-2, Bcl-xL) were significantly reduced in the bleeder group in comparison to the non-bleeder group (p < 0.05). Translocation of Bax into platelet mitochondria membrane and subsequent release of Cyt.c were more prevalent in the bleeder group. Platelet mitochondrial damage, activation of caspases, gelsolin cleavage, and ultimate platelet apoptosis in the bleeder group were observed. Oxidative stress and activation of both intrinsic and extrinsic pathways of platelet apoptosis may be linked to NSB in CF-LVAD patients. Additionally, biomarkers of oxidative stress, examination of pro-survivals and pro-apoptotic proteins in platelets, mitochondrial damage, caspase activation, and platelet apoptosis may be used to help identify HF patients at high risk of NSB post-implant. More... »

PAGES

125-137

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11010-017-3021-1

DOI

http://dx.doi.org/10.1007/s11010-017-3021-1

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1084028715

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/28343311


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96 release
97 risk
98 samples
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100 single blood sample
101 species
102 stress
103 study
104 subjects
105 subsequent release
106 total antioxidant capacity
107 translocation
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109 ultimate platelet apoptosis
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