Platelet Proteome Changes in Dogs with Chronic Heart Failure

doi:10.21203/rs.3.rs-46168/v1

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Research article

Platelet Proteome Changes in Dogs with Chronic Heart Failure

https://doi.org/10.21203/rs.3.rs-46168/v1

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published 30 Nov, 2020

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Background: Platelets play a central role in the development of cardiovascular diseases and changes in their proteins are involved in the pathophysiology of heart diseases in humans. There is lack of knowledge about the possible role of platelets in chronic heart failure (CHF) in dogs. Thus, this study aimed to investigate the changes in global platelet proteomes in dogs with CHF, to clarify the possible role of platelets in the physiopathology of this disease. Healthy-dogs (n=10) and dogs with CHF due to myxomatous mitral valve degeneration (n=10) were used. Blood samples were collected into tubes with acid-citrate-dextrose, and platelet-pellets were obtained by centrifuge and washing steps. Platelet-proteomes were identified using LC-MS based label-free differential proteome expression analysis method and matched according to protein database for Canis lupus familiaris.

Results: Totally 107 different proteins were identified in the platelets of the dogs being 4 out of them were significantly up-regulated and 6 down-regulated in the CHF dogs. Guanine-nucleotide-binding protein, apolipoproteins (A-II and C-III) and clusterin levels increased, but CXC-motif-chemokine-10, cytochrome-C-oxidase-subunit-2, cathepsin-D, serine/threonine-protein-phosphatase-PP1-gamma-catalytic-subunit, creatine-kinase-B-type and myotrophin levels decreased in the CHF dogs. These proteins are associated with several molecular functions, biological processes, signaling systems and immune-inflammatory responses.

Conclusion: This study describes by first time the changes in the protein composition in platelets of dogs with CHF. Our findings provide a resource for increase the knowledge about the proteome of canine platelets and their roles in CHF and could be a tool for further investigations about the prevention and treatment of this disease.

Large Animal Medicine

Small Animal Medicine

Platelet proteomic

heart failure

myxomatous mitral valve disease

dogs

Chronic heart failure (CHF) is one of the most common health problems in human and dogs (1). In dogs myxomatous mitral valve degeneration (MMVD) is a common cause of CHF. Abnormal systolic protrusion of the mitral valve leaflets into the left atrium due to progressive valve thickening is an important component of MMVD leading to CHF in around 50% of the cases (2).

During the progression of CHF, turbulent high velocity blood flow and changes in blood shear stress around the degenerative mitral valve leaflets may produce platelet activation in dogs (2, 3). Although clinical relevance of the platelet activation is not clear (4), some studies in this species have shown that activated platelets might contribute to the disease progression and an increased risk of sudden death by development of intra-myocardial coronary arteriosclerosis and micro-thrombi due to CHF (2, 5, 6). Therefore platelets may play an important role in development and progression of cardiovascular diseases in dogs with or without overt-thromboembolism (5) as occurs in humans (7).

Platelets are the smallest blood cells produced from megakaryocytes in the bone marrow, and are involved not only in hemostasis, but also in several pathophysiological processes (8). Since platelets contain about 5000 proteins, the importance and role of platelet proteins in the development and progression of diseases may be higher than expected (9). With the latest technological advances, protein identifications from different samples by proteomic analysis can provide new details in the discrimination between diseased and healthy status. Modern platelet proteomic studies can reveal quantitative and post-transitional changes in proteins, protein-protein interactions and protein localisations (10). Thus, platelet proteomics studies allow the characterization and elaboration of the basic biological, molecular and cellular functions of diseased and healthy conditions (10–12).

In humans, proteomic studies of platelets have been performed in heart diseases (coronary artery disease, mitral valve disease and CHF), as well as other pathological conditions such as sepsis, Alzheimer’s disease, diabetes mellitus, and uremia (13–15). In a pacing-induced pig heart failure model, platelet proteins were involved in cellular processes ranging from proliferation to apoptosis, as well as inflammation and cytoskeletal changes, providing that signal transduction pathways in platelets might be key mediators of platelet contributions to cardiac failure (16). Also, several platelet proteins such as amyloid A and apolipoprotein A1 indicated inflammatory involvement in the pathogenesis of heart failure in humans, while some of them such as cyclic nucleotide phosphodiesterase were associated with the protective role against β-adrenergic signaling and angiotensin II - induced cardiac remodeling in this disease (17). These evidence shows that platelet proteins are involved in the pathophysiology of cardiovascular diseases in humans and experimental animals.

There are two studies reporting the platelet proteome in dogs, and both of them were performed in three healthy subjects (15, 18). Cremer et al. (15) reported a total of 693 platelet proteins that were involved in coagulation, hemostasis, proteolysis, and organonitrogen compound metabolic process, and Trichler et al. (18) reported a total of 5.974 platelet proteins associated with various biological process such as response to stress, transport, cellular nitrogen compound metabolic process and signal transduction. However, with the exception of two studies in healthy dogs (15, 18), no platelet proteomic study has been performed in sick dogs. Thus, this study aimed to investigate the changes in global platelet proteomes in dogs with CHF, to clarify the possible role of platelets in the physiopathology of this disease.

Clinical Findings

In this study, all dogs with CHF showed the clinical signs at least for 2 months; exercise intolerance, murmur at mitral valve, coughing, and respiratory distress. Heart and respiratory rates in the test group were higher (P < 0.001) than those of controls. A significant increase in vertebral heart score was detected in the CHF dogs compared to the controls. There were not statistically differences in body weight and age between groups (Table-1). Compared to the control group, LVDd, LVDs, and EPSS values were higher (P < 0.01), but FS%, EF%, and MV E/A values were lower (P < 0.05) in dogs with CHF (Table-1).

Platelet proteomic findings

In the present study, a total of 107 proteins were identified and 10 out of them were differentially expressed at statistically significant level between two groups (Table-2). Compared with the healthy group, some proteins were increased (up-regulation, n = 4) and some proteins were decreased (down-regulation, n = 6) in dogs with CHF (Table-2). Platelet proteins; apolipoprotein A-II (ApoA-II), apolipoprotein C-III (ApoC-III), guanine nucleotide-binding protein (GBP) subunit alpha-11 and clusterin increased. On the other hand, cathepsin D, cytochrome C oxidase (COX) subunit 2, CXC motif chemokine 10 (CXCL10), serine/threonine - protein phosphatase PP1 - gamma catalytic subunit, myotrophin and creatine kinase B-type (CKB) decreased in dogs with CHF. Other proteins (n = 97) were given as a supplementary file (additional file 1).

String analysis of 10 differentially expressed proteins showed the relationship between COX proteins (COX-I, COX-II and COX-III) and cytochrome B oxidase (CYTB) with unspecified action of binding and catalysis. CXCL10 stimulates positively G protein -coupled receptor (CXCR3). Panther Go-Slim analysis showed the role of these proteins in molecular function such as binding (GNB, CXCL10, clusterin and ApoA-II), catalytic activity (COX, CK B-type, GNB, PPP1CC and ApoA-II), molecular function regulator (CXCL10 and apo A-II) and transporter activity (COX); and biological processes such as biological regulation (GNB, CXCL10 and apo A-II), biogenesis (Apo-AII), signaling (GNB and CXCL10) and cellular (COX, CK B-type, GNB, CXCL10 and apo A-II) and immune system processes (CXCL10). These proteins were of cell part (GNB, cathepsin D, clusterin and PPP1CC), extracellular region (CK B-type, CXCL10, clusterin and apo-AII), macromolecular complex (GNB and Apo-AII), membrane (GNB) and organelle (cathepsin, clusterin and PPP1CC). According to Panther pathway analysis, these proteins have a role in several signaling systems such as chemokine and cytokine mediated inflammatory pathway (GNB and CXCL10), alpha-adrenergic and endothelin signaling pathways (GNB), G-protein signaling pathway (GNB), dopamine receptor mediated signaling pathway (PPP1CC), and Wnt signaling pathway (GNB).

In this study, changes in proteins of the platelets are described in dogs with CHF. This represents to the author`s knowledge the first report in which changes in the proteins of platelets are reported in dogs with any disease. Platelet proteins may have a role in the pathophysiology of CHF caused by MMVD by regulating several molecular functions, biological processes and signaling systems. Therefore, this study could be a basis for future developments in order to better elucidate the role of platelets in the physiopathology of CHF and other different diseases in the dog, which could lead to new strategies of treatment and management of these conditions.

CHF cases in this study were diagnosed and classified as stage C according to ACVIM heart failure guidelines for dogs (19). The reason why stage C was selected in this study is because it corresponds to symptomatic dogs but without receiving any medication (19). Thereby the possible effects of cardiac drugs (inotropes, diuretics, beta-blockers and ACE inhibitors) on platelet functions were avoided (8).

In this study, a total of 107 platelet proteins were identified, in which 10 were found to be differentially expressed at statistically significant level. Some of the proteins (ApoA-II, GBP, cathepsin D, COX2, CXCL10, PPP1 and CKB) were already identified from healthy dogs in a previous study (18), whereas some proteins such as myotrophin and ApoC-III are described herein by first time in the dog.

Platelet myotrophin activity was decreased in this study, in line with a previous report in humans with CHF in which this protein was decreased in plasma samples (20). Myotrophin is hypertrophy-inducing factor, which acts in the formal arrangement of actin filaments and promotes cardiac muscle hypertrophy (20, 21), and was reported as a serum biomarker showing early activation in CHF (20). Additionally, myotrophin stimulates the transcription factor-kappa B (NF-kB) activity which regulates expression of several genes involved in immune responses, inflammation, proliferation, and apoptosis in ventricular myocytes. Therefore, decreasing platelet myotrophin activity in this study may be a protective response in the pathophysiology of CHF by limiting the NF-kB activity on cardiomyocytes (22), and the initiation process of myocardial hypertrophy in response to volume overload (23).

We have identified three apolipoproteins in this study; ApoC-III, ApoA-II, and clusterin (ApoJ). ApoC-III is a regulator of triglyceride rich lipoproteins which leads to hypertriglyceridemia and then cardiovascular disease (24–26). In line with our results, Roura et al. (27) found a significant increase in serum ApoC-III in people with dilated cardiomyopathy compared to controls. ApoC-III was described as a thrombogenic factor for cardiac patients due to complex interactions with plasma endogenous thrombin formation and coagulation cascade (24), as well as an increase in the accumulation of atherogenic lipoproteins in the vessel wall (26). Therefore, Apo-CIII could alter the homeostatic balance in a pro-coagulant way, and may promote atherothrombotic complications in dogs with CHF (28). Although these complications cannot be detected clinically during diagnostic work-up in dogs, it should be kept in mind that increasing Apo-CIII may be a risk factor for development of intra-myocardial coronary arteriosclerosis and micro-thrombi which were reported in dogs with CHF (2, 5, 6).

ApoA-II is a major component of HDL particles (24, 25), and controls reverse cholesterol transport to inhibit the development of atherosclerosis (29, 30). Antithrombotic effects of ApoA-II and HDL complex were related to inhibition of the coagulation cascade by stimulating endothelial production of nitric oxide and prostaglandins, and stimulation of clot fibrinolysis (31). Low level of ApoA-II was associated with increased severity and worse outcomes in heart failure patients (32). Thus, in this study, increasing platelet ApoA-II levels in dogs may be considered as a host response to be prevented from thrombotic effects and to manage fibrinolytic mechanisms during CHF.

Serum clusterin levels were reported to increase in various conditions such as myocardial infarction, inflammation, apoptosis, and oxidative stress (33, 34). Overall it has a protective effect by preventing endothelial activation (anti-atherosclerotic effect) (33–35) and alleviating angiotensin II - mediated damage of cardiomyocytes, a key mechanism in the pathogenesis and progression of CHF (36). In the present study, increased level of platelet clusterin may be a cytoprotective reaction against progression of CHF. In contrast, that serum clusterin level decreased due to continuous consumption was associated with an unfavorable prognosis in patients with CHF (34).

GBP subunit alpha-11, called as “G protein”, plays a central physiological role in the regulation of cardiac contractility by neurohumoral signals (37, 38). In addition, G proteins modulate the binding of angiotensin-II to adrenal cortex receptors in the homeostatic regulation of the cardiovascular system (39, 40). The increase found in this study agrees with previous reports in humans with cardiomyopathy, where functional activity of G protein increased (41). Upregulation of GNB in dogs with CHF may be considered as an adaptive protective response after myocardial injury (evidenced by increased serum cTnI levels) to prevent myocytes from apoptosis as reported in mice with ischemic stress (42), and regulate cardiac contractility during CHF.

CXCL10, also known as interferon-inducible protein-10 (IP-10), a member of chemokine family, was one of the down-regulated platelet proteins in dogs with CHF in the present study, similar to the results of serum CXCL10 in mice with myocardial infarction (43). After releasing from leukocytes and endothelial cells, CXCL10 binds to its receptor (G protein – coupled receptor; CXCR3), and leads to a range of inflammatory and immune responses (meaning the regulation of leukocyte and lymphocyte traffic to the damaged tissue); key factors in cardiovascular diseases (CVD) such as atherosclerosis, myocardial infarction (43–45), and cardiac remodeling (46). Circulating CXCL10 was found as the best indicators amongst others chemokines for differentiating healthy and heart failure patients (46).

COX enzyme plays important role for mitochondrial oxidative metabolism and ATP synthesis. In this study, COX-II was one of the down-regulated platelet proteins in dogs with CHF. COX functions are affected by several pathological conditions including myocardial ischemia (47) and cardiomyopathy in humans (48). COX deficiency was associated with increased mitochondrial reactive oxygen species (ROS) production and cellular toxicity (47). Increasing oxidative stress lead to pathological changes in COX structure and function, resulting in exacerbating apoptosis in patients with CHF (49). In the light of this information, down-regulated COX-II protein may be resulted from its excessive use in response to increased oxidative stress in the progression of CHF in dogs. Since COX enzyme handles more than 90% of molecular oxygen produced by the mammalian cells and tissue (47), low COX-II levels may be a factor in the emergence of exercise intolerance and/or respiratory stress in dogs with CHF, as reported in humans (49). Platelet COX activity enhancing drugs may have a potential to limit the progression of adverse cardiac remodeling and heart failure, as suggested for septic patients with low COX activity (50).

Similarly to our study, serum levels of cathepsin D were down-regulated in human with CHF (51) and myocardial infarction (52). Cathepsin D plays a role in cardiomyocyte autophagy, which protects against the progression of post-infarction cardiac remodeling (52). In this study, decreased cathepsin D was most probably resulted from its excessive use for myocardial damage contributing to left sided cardiac remodeling in dogs. This may reflect the impaired protective role of cathepsin D (52), meaning less autophagy in these dogs.

Finally, there were other two proteins showing downregulation in CHF dogs, the cytosolic brain type homodimeric - creatine kinase (CKB) and type 1 of serine/threonine phosphatases (PP1). The lower CKB concentrations in dogs with CHF may be contribute to contractile dysfunction resulted from impaired myocardial energy metabolism in these patients (53). PP1 is considered a key regulator of cardiac function, and modulation of its activity may represent a novel therapeutic target in heart failure in humans (54, 55) and dogs.

Regarding on protein-protein interaction, there is a high interaction potential among COX enzymes and between COX and CYTB to regulate oxidative metabolism. CXCL10 stimulates positively G protein-coupled receptor (CXCR3) and CXCR3 is a chemokine receptor that is expressed mainly on effector T cells (56). Therefore, both of them may play an important role in immune-inflammatory reaction such as T cell trafficking and function during CHF in dogs. In this study, reactome and string analysis showed the relationship between the proteins and their roles in hemostasis, signal transduction, immune system, protein metabolism, muscle contraction, apoptosis, extracellular matrix and chromatin organizations, and individual or protein-protein interaction in the formation of cellular responses to external stimuli. Panther pathway analysis of observed platelet proteins support further the roles of chemokine and cytokine mediated inflammatory pathway, and alpha-adrenergic and endothelin signaling pathways in involvement of the pathogenesis of CHF, in agreement with the previous studies of an experimental model of heart failure in swine (16), and humans with heart failure (17).

In conclusion, in dogs with CHF there are changes in the composition of the proteins of platelets. The proteins that change are associated to cellular, biologic, metabolic, immune, and coagulation system processes involved in the development of CHF. These proteins could be potential biomarkers and also targets for the development of new therapeutic and prophylactic strategies in dogs with heart failure.

This prospective study was performed between June 2017 and September 2018 at the Veterinary Teaching Hospital, Bursa Uludag University (BUU), Bursa / Turkey.

Dogs and groups

This study consisted of a total of 20 client-owned dogs of different breed, age, body weight, and both sexes. The dogs were divided in two groups: a control group integrated by healthy dogs (n = 10) and the group of dogs with CHF (n = 10). A complete physical, laboratory, thoracic radiography, electrocardiography (ECG) and echocardiographic examination were made in order to include each dog in the group of healthy and CHF dogs.

Case selection

The CHF dogs were of Stage C heart failure according to the American College of Veterinary Internal Medicine (ACVIM) classification (19) and had all of the three following criteria: 1) clinical signs of coughing, exercise intolerance and murmur (at least grade 4/6 on mitral valve puncta maxima), 2) a vertebral heart score higher than the reference ranges for the breed, left-sided cardiac remodelling, and pulmonary edema in thoracic radiography indicating the presence of cardiomegaly, and 3) MMVD that was diagnosed by trans-thoracic echocardiography (CarisPlus®, color Doppler, Italy) (57). In addition, these dogs had at least one cardiac rhythm abnormalities (i.e., sinus tachycardia and atrial fibrillation) identified by ECG and higher serum cardiac troponin I (cTnI) level than the reference ranges (< 0.03–0.07 ng/mL) at the time of first admission to the clinic (I-STAT®, Abaxis). Cardiologic examination was performed by PL (first author) and then MMVD with Stage C CHF was confirmed by specialists, MK and ZY.

Healthy dogs were obtained from staff and students of BUU Veterinary Teaching Hospital. They were dogs without any pathology based on physical, laboratory (routine biochemistry panel with serum cTnI measurements) and cardiological examination (ECG and echocardiography).

Cases with a history of any disease different to CHF for the past 2 months and that had any chronic disease or were under medication were excluded of the study. Besides, routine hematological and biochemical data were used to identify and exclude patients who had anemia, renal failure, endocrine diseases (diabetes mellitus and hypothyroidism), or hepatobiliary diseases accompanying primary problem. Ehrlichia, Lyme disease, Dirofilaria, Leishmania and/or Anaplasma positive cases were excluded by rapid screening tests (Anigen CaniV and LeishVet, Bionate).

The dogs included in the study were treated by conventional medical approaches (diuretics, inotropic, and angiotensin converting enzyme inhibitors, etc.) for heart failure, and then re-examined as needed. Thus, dogs studied continued their lives under the responsibility of the patient owners. We have a permission to collect the animals’ samples from the owners.

Sample collection and measurements

Blood samples were collected from the cephalic veins into EDTA containing tubes for complete blood counting, and acid citrate dextrose (ACD) containing tubes for platelet isolation (12), as well as into anticoagulant-free tubes for routine serum biochemistry analysis.

Platelet isolation

A volume of 20 ml of venous blood was collected into the tubes with ACD containing trisodium citrate (22.0 g/L), citric acid (8.0 g/L) and dextrose (24.5 g/L) (BD Vacutainer), and platelets were then isolated according to the method modified from Cevik et al. (12). Briefly, platelet isolation steps included:

i- Blood was drawn into ACD tubes for platelet isolation.

ii- It was centrifuged (150 g / 15 min, at room temperature) to obtain platelet-rich plasma (PRP).

iii- PRP was transferred to dry tubes. HEPES buffer solution (137 mM NaCl, 3.8 mM HEPES, 5.6 mM Glucose, 2.7 mM KCl, 1 mM Magnesium sulfate, pH 7.4; Sigma) was added over the PRP samples. This was suspended with prostaglandin E1 (1 µM/L, Sigma) to inhibit platelet activation during high-speed centrifugation (58). This mix was centrifuged at 800 g for 15 min to concentrate the platelets.

iv- Platelet pellets were re-suspended in ammonium bicarbonate solution (50 mM, Sigma) and then centrifuged at 800 g for 15 min to obtain final platelet pellets. Platelet extractions with WBCs and RBCs contaminations less than 0.5 and 0.1% by Diff-Quick staining, respectively, were considered sufficient to perform platelet proteomic study.

Serum samples and pure platelet pellets were stored in cryo tubes at -80 degrees. After the sample collections in both groups were completed, all platelet pellets were analysed at the same time.

Proteomic analysis

LC-MS based label free proteomics analysis was done for 10 control samples and 10 CHF samples being each sample individually analysed. Every injected sample is a separate biological replicate. Steps of platelet proteomic analysis were performed in a total of 20 different biological samples, as described in a previous paper (12). Before starting the analysis, the detector and calibration settings were made by the MassLynx program (V4.1-Waters) which is specific to Xevo G2-XS Q TOF (Waters) device where the analysis were performed. The method was switched to SONAR and sensitivity mode and the tryptic peptides generated were subjected to 132 min reverse phase chromatography at 300 nL / min flow rate in a HSS T3 (Waters-186008818) nano column. Separation of the peptides from the column was achieved by increasing in the range of 5–35% acetonitrile according to their hydrophobicity and analyzed by mass spectrometry. During the analysis, data were collected for peptides that could be identified in the m / z range 50-1950. MS analysis was performed for 0.7 s and information was collected about the entire peptide. Then, MS / MS analysis was performed for 0.7 sec and the peptide fragmentation and sequence information were obtained.

Statistical analysis

In this study, the student t test was applied for the clinical, laboratory (hematologic and biochemical) and cardiological examination results in two groups. Results were given as mean ± standard deviation, and P < 0.05 was considered statistically significant (SigmaStat 12.0, GmBH). Proteins obtained in three separate sets were paired with previously described proteins for Canis lupus familiaris in the gene bank. Protein identification and statistical analysis was performed using Progenesis QIP software (Waters-2018). In the method, samples from different patients were compared as a group and the proteins separating the groups were identified. Various statistical calculations were used in order to test reliability of the results obtained, to compare hundreds of proteins at the same time and to reach significant information by software package programs. Platelet proteins with at least P < 0.05 and more than 1.2-fold change were accepted as significant in dogs with CHF compared to control group.

String and reactome analysis were performed to show the protein – protein interaction, roles of proteins in molecular, cellular, and biological process, and pathway analysis (www.string-db.org and www.pantherdb.org).

ACVIM: American College of Veterinary Internal Medicine; ApoA-II: apolipoproteins A-II; ApoC-III: aopoliporotein C-III; CHF: chronic heart failure; CKB: creatine kinase type B; COX: cytochrome-C-oxidase; cTnI: cardiac troponin I; CXCL10: CXC-motif chemokine-10; GBP: Guanine nucleotide-binding protein; HDL: High-density lipoprotein; ROS: reactive oxygen species; MMVD: myxomatous mitral valve degeneration; PP1: serine/threonine-protein phosphatase PP1-gamma catalytic subunit.

Ethics approval and consent to participate

This study was approved by the Ethics and Welfare Committee of the Bursa Uludag University– Turkey (approval No. 2016 - 12/03).

Consent for publication

Not applicable.

Availability of data and materials

All data in this study will be available from the corresponding author upon reasonable previous request and with the permission of the research fund.

Competing interests

The authors declare no competing interests. Zeki YILMAZ (Prof. Dr., corresponding author) is listed as an associate editor in clinical pathology section of BMC Vet Res. A co-author who is Jose J. Ceron is a member of the editorial board (section editor) of this journal.

Funding

The project was supported by Uludag University Research Fund (DDP(V) − 2017/6; Bursa, Turkey). This funding was important to pay for platelet proteomic analysis (service procurements).

Authors’ contributions

PL: who is listed as a first author and wrote the manuscript draft and carried out cardiologic examinations. PL and AS: collected the material and performed routine laboratory analysis (CBC, serum chemistry, and platelet isolations). MK: confirmed the diagnosis of MMVD and CHF during diagnostic work-up. EA and ATB: performed platelet proteomic analysis. OC: an adviser for platelet isolations. RT: interpreted cardiological data and corrected the manuscript. JJC: adviser for laboratory analysis, statistic work and manuscript revision. ZY: who is a corresponding author, and supervisor for clinical research and finalizing the manuscript. All authors have read and approved the final manuscript.

Acknowledgements

Not applicable

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Table-1:
Selected clinical, hematological and echocardiographic variables in healthy dogs and dogs with chronic health failure (CHF) (Mean ± Sd)
Parameter	Healthy Dogs n = 10	Dogs with CHF n = 10	P value
Clinical findings
BW Kg	25,2 ± 6,5	22,4 ± 19,4	NS
Age years	5,3 ± 1,1	8,1 ± 5,1	NS
P bpm	111 ± 8	146 ± 28	<0,001
R breath/min	27 ± 7	68 ± 21	<0,001
VHS	9,3 ± 1,2	12,5 ± 1,5	<0,001
Hematological and serum biochemistry findings
PLT x10³/mL	346 ± 66	325 ± 158	NS
cTnI ng/mL	0.04 ± 0.02	0.15 ± 0.1	<0,05
Echocardiographic findings
IVSDd	1,1 ± 0,4	0,7 ± 0,1	NS
LVDd	3,0 ± 0,7	5,0 ± 0,4	<0,01
LVPWDd	1,2 ± 0,2	1,3 ± 0,4	NS
IVSSd	1,1 ± 0,3	1,1 ± 0,1	NS
LVSd	2,1 ± 0,5	3,2 ± 0,3	<0,01
LVPWSd	1,1 ± 0,1	1,2 ± 0,3	NS
FS %	34,4 ± 3,8	26,0 ± 6,4	<0,05
EF %	61,6 ± 9,2	48,0 ± 9,7	<0,05
EPSS	0,3 ± 0,1	0,8 ± 0,1	<0,001
LA/Ao	0,9 ± 0,2	2,6 ± 0,9	<0,001
MV E/A	1,5 ± 0,3	3,8 ± 1,5	<0,05
BW: Body weight, P: Pulsation, R: Respiration, VHS: Vertebral heart score, PLT – platelet, cTnI – cardiac troponin I Left ventricular (LV) - related parameters and left atrium to aorta (LA/Ao) ratio were measured from RPLA 4-chamber view and RPSA view - Aortic level, respectively. IVSDd interventricular septum diastole diameter, IVSSd interventricular septum systole diameter, LVDd left ventricular diastole diameter, LVSd left ventricular systole diameter, LVPWDd left ventricular post wall diastole diameter, LVPWSd left ventricular post wall systole diameter, EPSS E - point to septal separation, FS fractional shortening, EF ejection fraction, MV E/A mitral vale early ventricular (E) and late atrial contraction (A)

Table-2:
Accession number, peptides, scores, fold-changes and description of the platelet proteomes (n=10) that were differentially expressed in dogs with chronic heart failure compared to controls.

Proteins are listed according to up or down regulation and fold change
Accession no	Peptides*	P value	Fold change	Protein description	Up or down
P12279	6 (5)	0.04	2,01	Apolipoprotein C-III	Up
P52206	19 (10)	0.02	2,07	Guanine nucleotide-binding protein subunit alpha-11 (Fragment)	Up
E2RAK7	16 (14)	0.03	1,94	Apolipoprotein A-II	Up
P25473	68 (59)	0.03	1,81	Clusterin	Up
Q5KSV9	1 (1)	0.02	2,87	C-X-C motif chemokine 10	Down
P67780	6 (5)	0.02	1,49	Cytochrome C oxidase subunit 2	Down
Q4LAL9	6 (6)	0.04	1,46	Cathepsin D	Down
P05124	51 (45)	0.04	1,28	Creatine kinase B-type	Down
Q8MJ46	13 (6)	0.03	1,24	Serine/threonine-protein phosphatase PP1-gamma catalytic sub.	Down
Q863Z4	19 (16)	0.04	1,20	Myotrophin	Down
*: Peptide column shows two values where there first number is the number of identified peptides and the second number in the parentheses is the number of non-conflicting peptides included in intensity calculations.

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Platelet Proteome Changes in Dogs with Chronic Heart Failure

Status:

Journal Publication

Version 1

Abstract

Background

Results

Clinical Findings

Platelet proteomic findings

Discussion

Conclusions

Methods

Dogs and groups

Case selection

Sample collection and measurements

Platelet isolation

Proteomic analysis

Statistical analysis

Abbreviations

Declarations

References

Tables

Supplementary Files

Status:

Journal Publication

Version 1