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vol. 13
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Potential novel biomarkers of cardiovascular dysfunction and disease: cardiotrophin-1, adipokines and galectin-3

Simona Hogas, Stefana C. Bilha, Dumitru Branisteanu, Mihai Hogas, Abduzhappar Gaipov, Mehmet Kanbay, Adrian Covic

Arch Med Sci 2017; 13, 4: 897–913
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According to the World Health Organization (WHO), cardiovascular diseases (CVD) are currently the leading cause of morbidity and mortality worldwide. The burden of cardiovascular death is also very high in Europe, with the highest rates being encountered in Central and Eastern Europe [1]. The main causes of cardiovascular (CV) death are ischemic heart disease and cerebrovascular disease. A significant proportion of these deaths may be prevented through better surveillance and prophylaxis; risk stratification is an important part of this strategy for timely interventions and long-term targeted management [2].
CV risk assessment models are based on traditional risk factors such as age, sex, smoking, blood pressure, diabetes, total cholesterol, HDL cholesterol, family history, etc. Risk models such as the US Framingham risk score or the European SCORE model evaluate CV risk in “apparently healthy” subjects (without already established CVD or diabetes) [3]. Although these are first-line tools for patients who need stepped-up prevention, limitations are inevitable: “intermediate” risk patients remain a heterogeneous category; frequently patients with an apparently low risk have subclinical atherosclerosis and vascular dysfunction that would benefit from a more intense intervention. In addition, CV risk may also be underestimated in patients with central obesity [3, 4].
The search for molecules that could help improve CVD assessment in primary and secondary care is continuous and prolific. Despite sustained efforts and a very large panel of candidates for biomarkers, very few molecules have proven their utility in clinical practice. Standardly used biomarkers for CVD include natriuretic peptides (brain natriuretic peptide (BNP), and N-terminal prohormone of brain natriuretic peptide (NT-proBNP)), troponins, C-reactive protein (CRP) and cardiac enzymes. The Food and Drug Administration (FDA) list of validated cardiovascular biomarker includes the above and also galectin-3 and ST-2 (Table I) [5].
All these prediction, diagnosis and prognosis biomarkers proved to be the best so far but still have their pros and cons. BNP and NT-proBNP have similar clinical performance in diagnosing heart failure (HF) but NT-proBNP may be preferred to BNP due to its longer plasma half-life and its better outcome prognosis in the Valsartan Heart Failure Trial [6]. Natriuretic peptides (NP) best rule out cardiac dysfunction in patients with acute dyspnea presenting to the emergency room and are useful in establishing the prognosis and disease severity in acute and chronic HF. BNP has also been validated for risk stratification in acute coronary syndromes (ACS). However, NP are greatly influenced by non-cardiac factors, one of the most prominent being kidney function, and are not useful in discriminating the etiology of HF [7–9]. Cardiac troponins (cTn) are first line biomarkers for ACS, having clinical sensitivity and myocardial specificity. cTn are the gold-standard markers for myocardial injury; however, brief elevations can occur in non-ACS conditions. Also, cTn are not able to provide differential diagnosis between ischemic, inflammatory and traumatic myocardial injury [10]. Cardiac CRP (cCRP) is a high-sensitivity CRP assay recently validated by the FDA with evidence of efficacy and extended use for CV risk assessment/stratification. It should be interpreted with caution in the presence of systemic inflammatory conditions, acute infections, trauma and others (Table I) [11, 12]. Galectin-3 and ST-2 are two cardiac biomarkers recently cleared by the FDA and also recommended by the American College of Cardiology Foundation/American Heart Association (ACCF/AHA) guidelines for use as an aid in the management of patients with HF. Galectin-3 should be interpreted with caution in patients with altered kidney function and/or cancer [8, 13, 14]. ST-2 also rises in inflammatory and pulmonary diseases (Table I) [13]. Regarding cardiac enzymes (creatine kinase (CK), creatine kinase muscle/brain (CK-MB) enzyme, lactic dehydrogenase (LDH) and myoglobin), these are to be used as an aid in the diagnosis of acute myocardial infarction (AMI). Their limitations are presented in Table I [15, 16].
Recently, new molecules regulating atherosclerosis, inflammation, endothelial dysfunction (ED), fibrosis and thrombosis have been proposed as biomarkers for evaluating CV risk and disease, especially for risk stratification. Adding these biomarkers to established CV risk assessment models could provide a significant increment to the predictive value of these models. Novel CV biomarkers should be cost-efficient, valid, reproducible, reliable and accurate. They should be capable of independently predicting CVD and also of providing more information than traditional biomarkers [3, 4].
Several new molecules have been proposed as biomarkers for evaluating CVD. We conducted a literature search to select the best novel biomarkers that predict the development of new CVD, differentiate CVD from other diseases, evaluate the severity of CVD and might also be considered prognostic markers. We found 19 novel biomarkers that have been studied in CVD (Table II).
We chose here to review cardiotrophin-1 (CT-1) as it is a promising biomarker for hypertensive heart disease, where it brings significant additional information to that provided by NP. Also, the adipokines leptin, adiponectin and resistin have been proposed as biomarkers for various cardiovascular conditions and are discussed below, where clarifications regarding their prognostic value are made. Finally, we chose here to discuss the strong and weak points of galectin-3 and its utility in comparison to other biomarkers of HF in order to clarify the indications for galectin-3 determination. Table III illustrates which of these five biomarkers could be used as potential predictors for vascular inflammation, atherosclerosis, ED and cardiovascular fibrosis.
As the literature is replete with clinical information on biomarkers which are often inconsistent, this review is intended to clarify which of these biomarkers deserve further analysis and what are their potential indications of use.


CT-1 is a 21.5-kDa protein, a member of the interleukin 6 (IL-6) family of cytokines [17], first described by Pennica et al. [17] to induce cardiomyocyte hypertrophy by atrial natriuretic peptide secretion and organization of myosin light chains into sarcomeres.

Pathophysiology and experimental studies

CT-1 is a survival promoter cytokine that is upregulated in cardiomyocytes and cardiac fibroblasts in response to mechanical (ventricular stretch), humoral (angiotensin II, aldosterone, catecholamines), metabolic (glucose, insulin) and hypoxic stress. In acute stress, CT-1 promotes cell survival. However, if stressful signals persist, chronic upregulation of CT-1 leads to cardiomyocyte hypertrophy and, finally, left ventricular dysfunction [4]. CT-1 exerts its biological activity through the leukemia inhibitory factor receptor  (LIFR)/glycoprotein 130 (gp130) heterodimer receptor that further activates multiple signaling pathways with different consequences (Figure 1): Janus kinase/signal transducer and activator of transcription 3 (JAK/STAT3) promotes ventricular hypertrophy while p42/44 mitogen-activated protein kinase (p42/44 MAPK) and the phosphoinositide 3-kinase/Akt (PI3K/Akt) pathways inhibit apoptosis and promote cardiomyocyte survival.
It may be possible that myocyte hypertrophy is also mediated by the activation of mitogen-activated protein kinase kinase 5/extracellular-signal-regulated kinase 5 (MEK5/ERK5 pathway) [4, 18–20]. CT-1 is also expressed in vascular endothelial cells and has direct vascular effects, resulting in atherogenesis, vascular dysfunction, arterial stiffness, and increased blood pressure [21–23]. Overall, CT-1 is a potent profibrotic agent for the heart and vessels [4, 23].

Clinical studies

CT-1 is a key link between hypertension, left ventricular hypertrophy (LVH) and HF. In a meta-analysis performed by Song et al. [24] Cardiotrophin-1 levels were highest in hypertensive patients with LVH and HF compared to controls, followed by hypertensive patients with LVH without HF and hypertensive patients without LVH or HF. Moreover, CT-1 directly correlates with left ventricular mass index (LVMI) in hypertensive patients independently of systolic blood pressure: patients with CT-1 above the cut-off value of 39 fmol/ml are six times more likely to have LVH. Thus CT-1 could be applied in the screening and diagnosis of hypertensive heart disease, helping to select patients that would best benefit from echocardiography [25].
Regarding CT-1 and HF, Talwar et al. [26] were the first to report that plasma CT-1 levels correlate with the degree of systolic dysfunction in HF patients. Plasma CT-1 levels are also increased in patients with diastolic HF and positively correlate with left ventricular filling pressures [27]. Furthermore, CT-1 levels significantly predict overt HF in hypertensive patients: CT-1 concentration positively correlates with NT-proBNP and negatively correlates with left ventricular ejection fraction [28, 29]. The cut-off value for CT-1 plasma levels of 152 pg/ml has 77% sensitivity and 85% specificity for detecting the occurrence of overt HF in hypertensive patients [28]. Also, CT-1 is a predictor of mortality in chronic HF irrespective of etiology and independently of BNP [30]. Thresholds and potential indications for CT-1 use are presented in Table IV.
CT-1 could also be used as a monitoring tool for therapeutic management in hypertensive heart disease patients: LVH and CT-1 levels had a tendency to decrease after losartan treatment rather than after treatment with atenolol [31].
Finally, although a promoter of ED, studies failed to show an association between CT-1 and coronary heart disease (CHD) [32].

Cardiotrophin-1 vs. standardly used biomarkers

With regards to predicting LVH onset in hypertensive patients, CT-1 performs much better than NT-proBNP, with 70% sensitivity and 75% specificity for CT-1 cut-off value vs. 40% sensitivity and 61% specificity for NT-proBNP cut-off value [25].
Even though NT-proBNP is the gold-standard biomarker for HF diagnosis, studies have shown that the association between CT-1 and NT-proBNP is superior to NT-proBNP alone in assessing the presence of HF in hypertensive patients [28, 29]. CT-1 is less specific but more sensitive than NT-proBNP for detecting stage C HF in hypertensive patients, thus improving NT-proBNP sensitivity for detecting HF [29]. The combination CT-1 and BNP is better than either marker alone in predicting mortality in chronic HF [30].
Also, CT-1 may compensate for some of the downsides of NT-proBNP: CT-1 is not influenced by kidney function, while NT-proBNP negatively correlates with estimated glomerular filtration rate (eGFR) [29]. Also, CT-1 correlates with echocardiographic parameters of LVH (LVMI), while NT-proBNP does not correlate with LVH in hypertensive patients with normal cardiac function. Thus, NT-proBNP is not useful in assessing hypertensive heart disease in patients with normal systolic function [25].
In summary, CT-1 is a promising biomarker for predicting maladaptive hypertensive heart disease in hypertensive patients. CT-1 could become a predictor of arterial hypertension prognosis in terms of occurrence of LVH in hypertensive patients with normal systolic function. Also, CT-1 could bring incremental power when used together with NT-proBNP for assessing HF in hypertension and for the prognosis of chronic HF. Eventually, circulating CT-1 determination could also be useful for establishing optimal individualized therapy and for monitoring disease evolution in these patients.


Adipocytokines (adipokines) are adipose-derived proteins (hormones and cytokines) produced by the adipose tissue that perform major functions concerning energy expenditure and metabolism, bone mass regulation, insulin sensitivity/resistance, inflammation and cardiovascular function [33, 34]. Recent research has focused on the role of adipocytokines in CV homeostasis.


Leptin is a pleiotropic adipokine, a 167 amino-acid peptide secreted by adipocytes, and a member of the IL-6 family. It is the main anorexigenic hormone, regulating lipid and glucose metabolism, bone metabolism, immune function and the cardiovascular system [35, 36]. Leptin has recently emerged as a novel and potential risk factor for CVD, being one of the key elements that connects it with obesity.

Pathophysiology and experimental studies

Obese-associated hyperleptinemia has deleterious vascular effects [35]. By acting on the sympathetic nervous system (SNS), chronic leptin signaling impairs endothelium-dependent vasorelaxation and favors an increased blood pressure response to angiotensin II in murine models [37]. Hyperleptinemia also has proinflammatory [38], proatherogenic [36] and prothrombotic effects [39], thus promoting ED. The pathophysiology of deleterious actions of leptin is presented in Figure 2.

Clinical studies

In a case-control study performed by Karthick et al. [40], patients with non-thrombolysed AMI had significantly higher levels of leptin [40]. Moreover, in a meta-analysis performed by Zeng et al. [41], high leptin levels were significantly associated with an increase in CHD (including myocardial infarction) (OR = 1.90) and stroke risk (OR = 2.14) [41]. In support of these findings, hyperleptinemia positively and independently correlated with increased coagulation activity (high circulating levels of coagulation factor VIII, fibrin D-dimer, fibrinogen and von Willebrand factor) in a study performed by Wannamethee et al. [42]. However, the numerous discrepant results in the literature are not to be disregarded, and the following question arises: is the effect of hyperleptinemia on CVD exaggerated? The results were adjusted for age, blood pressure and body mass index (BMI) in all the studies included in the above meta-analysis, but there are other possible confounders that should be taken into consideration. One of them is inflammation, and CRP is an important link between obesity and CVD [43].
Hyperleptinemia is also an independent predictor of HF in older men without pre-existing CHD, after adjustment for BMI [44]. However, in overweight or obese men with pre-existing CHD, leptin seems to have no additional significant effect, as probably obesity-triggered increased cardiac workload is enough to increase HF risk [45]. Despite high levels in HF, leptin is not a reliable marker as it is highly dependent on body fat: normal/low leptin levels may be encountered in HF patients with cachexia [45].


There are also studies that have reported paradoxical results regarding the relationship between leptin and CVD risk. In the NAMIS study, low leptin levels 7 days after the onset of an AMI were associated with poor outcome defined as higher risk for adverse cardiovascular events and poor survival [46]. Also, Scholze et al. [47] provided proof that low leptin levels are in fact an independent predictor of all-cause death in hemodialysis patients, with the most frequent cause being CVD [47].
Such contradictory findings are reminiscent of the concept of the “obesity paradox” or “reverse epidemiology”: although a high body mass is a conventional risk factor for CVD in apparently healthy individuals, there seems to be a reversal of the relationship between overnutrition and long-term outcome in high-risk patients (chronic kidney disease and/or with already established CHD or HF), where, paradoxically, overnutrition has a protective effect against mortality [48, 49]. The concept may apply to hyperleptinemia as well, as leptin is a reflection of body fat [33].

Leptin vs. standardly used biomarkers/other novel potential biomarkers

In a large prospective population-based study of 6502 participants with a mean follow-up of 11.4 years, leptin did not correlate with incident ischemic heart disease or stroke, after adjustment for sex, age, blood pressure, lipid profile, smoking, comorbidities such as hypertension and diabetes, BMI, insulin resistance parameters, eGFR and CRP. However, CRP remained an independent predictor of ischemic heart disease (fatal and non-fatal) after adjustment for all the above variables and also for leptin and adiponectin [43]. It seems that the association between leptin and CVD is mediated by inflammation/CRP; indeed, leptin and CRP levels seem to correlate and leptin is able to directly regulate CRP synthesis [50]. However, despite the power of leptin alone being limited, it may be useful in conjunction with other biomarkers: the association between leptin, adiponectin and traditional CV risk performed significantly better in predicting CHD when compared to a model that included only the conventional risk factors, with maximum reclassification in the intermediate risk group [51].
Overall, these data do not yet support the use of leptin as a biomarker in clinical practice for assessing the risk of CHD. Leptin levels should be interpreted with caution, according to the underlying condition.


Adiponectin is a 244 amino acid adipokine, part of the collagen superfamily. The most abundant form in the plasma is the high molecular weight (HMW) adiponectin, the most stable and with the longest half-life [33, 52].

Pathophysiology and experimental studies

Adiponectin improves insulin sensitivity [53] and fatty acid oxidation [52] and inhibits vascular inflammation [54]. Adiponectin also protects against ED by increasing endothelial nitric oxide synthase (eNOS) activity and by promoting angiogenesis and endothelial cell repair [52, 55, 56] (Figure 3).
In addition, it inhibits atherogenesis and also has antithrombotic effects [52, 57].

Clinical studies

In a longitudinal population-based cohort study, baseline adiponectin levels were negatively and independently associated with the development of CHD in a 10-year follow-up [58]. Moreover, Wang et al. [59] showed that adiponectin concentration inversely correlates with the severity of coronary artery disease assessed through the Gensini score. In their study, the HMW isoform of adiponectin showed a stronger correlation with the severity of coronary artery disease than total adiponectin did, pointing to the utility of HMW adiponectin as a potential biomarker for detecting the risk of CHD [59]. Also in type 2 diabetes mellitus (DM) patients, the C1q-adiponectin/total adiponectin ratio is a significant independent predictor of the atherosclerosis score with 72.2% sensitivity and a positive predictive value of 78.8%. The above relationship could be explained by the anti-atherogenic actions of adiponectin: binding of adiponectin to complement fraction C1q protects against the C1q-induced inflammatory process in systemic atherosclerosis [60].
Adiponectin may protect against hypertension onset: in a systematic review and meta-analysis performed by Kim et al. [61], adiponectin levels were lower in patients with hypertension than in controls. Also, the risk of developing hypertension decreased with the increase of adiponectin levels.


High adiponectin levels are encountered in HF, where adiponectin increases with left ventricular dysfunction progression. Adiponectin is directly correlated with BNP and NT-proBNP and also with TNF-: adiponectin may rise in congestive HF to mitigate the actions of TNF-. Also, HF patients with higher adiponectin levels have a significantly higher mortality risk [62–64]. Thus, adiponectin could be considered in the future as a marker of HF severity and also a predictor of mortality.
Also, adiponectin in the upper quartile in CHD patients is associated with a higher risk of recurrent adverse events [51]. High adiponectin levels are an independent predictor of all-cause and cardiac mortality in patients undergoing coronary angiography for stable angina or ACS [65], in patients with carotid atherosclerosis undergoing carotid endarterectomy [66] and in elderly patients (≥ 65 years) [67]. Also, despite an increase 3 months after coronary artery bypass grafting (CABG) in severe CHD patients, adiponectin directly correlated with markers of ED [68]. It may be speculated that adiponectin increases as a compensatory mechanism to counteract ED that occurs after CABG. Other authors observed a decrease in adiponectin concentration 12 months after CABG together with a significant improvement of ischemic and HF symptoms [69]. BNP is a strong predictor of adiponectin levels and is associated with adiponectin release from the adipose tissue [70]. Also, high adiponectin levels may be a reflection of adiponectin resistance at the receptor level [69]. This may partially explain why adiponectin predicts negative outcomes in subjects with advanced CVD and also why adiponectin declines as improvement of cardiovascular function occurs after CABG.
Therefore, the interpretation of adiponectin concentration should be made according to underlying CVD severity, as it has different predictive implications (the “adiponectin paradox”) [67]: in disease-free subjects, high adiponectin is a marker of low risk for acute or chronic CHD, while in patients with established CHD/HF, high adiponectin levels seem to be independent predictors of future adverse events [71].

Adiponectin vs. standardly used biomarkers

In order to evaluate the prognostic power of adiponectin in patients with established CHD, Ang et al. [72] compared adiponectin to BNP with regards to predicting a future adverse outcome (all-cause death, readmission for ACS or congestive HF) in patients with ACS: an increase in adiponectin following admission for ACS better predicted adverse outcome than single determinations at baseline and 7 weeks, but this relationship was lost after adjustment for BNP. Therefore, BNP performs better than adiponectin for prognosis of adverse events in ACS [72].
As mentioned above, adiponectin is independently associated with NP and parallels the evolution of HF [62]. Adiponectin is a predictor of mortality in HF, independently of NP (Table IV) [64]. Subsequently, the hypothesis that adiponectin could be used in conjunction with NP to improve mortality risk assessment in HF is to be verified.


Resistin is a proinflammatory cytokine, a member of the adipokines, predominantly produced by macrophages but also released from the adipose tissue [73]. Resistin is involved in the pathogenesis of insulin resistance (“resists” insulin actions) and is also thought to be a contributory factor in CVD development [73].

Pathophysiology and experimental studies

Firstly, high levels of resistin are associated with insulin resistance and diabetes: resistin upregulates the suppressor of cytokine signaling-3 (SOCS-3) pathway that leads to downregulation of insulin receptor expression and also inhibits phosphatidyl inositol 3-kinase activation that mediates insulin metabolic functions [53]. Secondly, resistin promotes ED, atherogenesis and atherothrombosis, having direct effects on the vessels: (1) resistin down-regulates eNOS gene expression, leading to low nitric oxide levels with reduced vasorelaxation function [73], (2) resistin increases foam cell formation [74] and also proliferation and migration of VSMCs [75, 76], (3) resistin upregulates the expression of genes associated with atherothrombosis [77]. Vascular thrombosis manifested as increased platelet reactivity and adherence to the endothelium and ED are the main triggers of CVD [78]. Finally, resistin also upregulates TNF- expression and activates the NF-B proinflammatory signaling pathway in the myocardium, leading to cardiac inflammation and fibrosis [79]. These findings led to the investigation of resistin as a possible marker and therapeutic target in CVD (Figure 4).

Clinical studies

In prospective studies, high resistin significantly increases the risk for all CVD, chronic CHD [80] and acute coronary syndrome, independently of other CV risk factors, including markers of inflammation (IL-6 and CRP) [81]. A resistin concentration equal to or above 17.3 ng/ml is associated with a 13-fold increase in the risk of major cardiac and cerebrovascular events in patients with multivessel coronary disease (Table IV) [82]. Resistin levels also rise 24 h after CABG as a marker of ischemia-reperfusion injury and are correlated with oxidative stress [83]. However, resistin levels do not seem to change after 12 months of medical treatment or CABG in these patients and thus may not be helpful for follow-up after therapeutic intervention [69]. Also, adding resistin to traditional CV risk factors significantly improves the risk assessment for ischemic stroke [84].
Nevertheless, resistin is a strong independent predictor of incident HF in community-dwelling older individuals and is also correlated with NYHA functional class in prospective studies. Whether resistin has a negative direct impact on the myocardium or it is merely a reflection of the vascular inflammatory process, it can be proposed as a biomarker for HF risk assessment and stratification [45, 85, 86].
Moreover, a meta-analysis performed by Fontana et al. [87] regarding the influence of resistin on mortality in high-risk patients (patients with CHD, myocardial infarction, ischemic stroke, type 2 DM, end-stage renal disease) showed that resistin significantly increased the risk for all-cause mortality, with a hazard ratio (HR) of 1.24 for 1 standard deviation increment in resistin levels. In the same meta-analysis, the effect of resistin on cardiovascular mortality was however neutral (HR = 1.05 for 1 standard deviation increase in resistin levels) [87].


In the prospective study of Zhang et al. [88], resistin did not provide prognostic information beyond traditional risk factors regarding the development of HF in CHD patients. Therefore, resistin may be proposed as a biomarker for HF in non-CHD individuals.

Resistin vs. standardly used biomarkers

Although resistin significantly correlates with CRP and BNP levels, resistin is a predictor of HF in the community, independently of these biomarkers, and the predictive power is maintained after the exclusion of CHD individuals. The HRs for incident HF in the second and third tertile of resistin after adjusting for various cardiovascular risk factors, CRP and BNP are presented in Table IV [86].
Resistin levels correlate with troponin 24 h after CABG, reflecting myocardial injury [83]. Resistin levels are also significantly increased in AMI and unstable and stable angina patients, with resistin being significantly higher in AMI than in unstable/stable angina. Resistin correlates with myocardial injury enzymes, troponin I and CRP in AMI, but not in unstable/stable angina patients [89]. Resistin rises 3–6 h after chest pain onset and peaks 12 h after chest pain onset (Table IV) [90]. Thus, resistin could become a biomarker for AMI.
Overall, increasing clinical evidence supports the use of resistin as a cardiovascular marker for risk stratification and prognostic in CHD and as a predictor of HF in community-dwelling individuals. Clinical studies that evaluate the prognostic power of resistin in comparison to that of classical biomarkers are needed.


Galectin-3 is a member of the lectin family, encoded by the LGALS3 gene located on chromosome 14. It is expressed predominantly by macrophages and plays an important role in the pathophysiology of immunity/inflammation related diseases (cancer, metabolic diseases). Galectin-3 is a marker of tissue fibrosis, including cardiovascular fibrosis, and also of atherosclerosis. Consequently, galectin-3 has emerged as a new biomarker for CV disease, especially HF but not only [91, 92].

Pathophysiology and experimental studies

Galectin-3 is one of the key links between inflammation and fibrosis at the cardiovascular level [91, 92]. It regulates chronic inflammation within the vessels by promoting osteogenic differentiation of VSMCs, leading to macrocalcifications in the atherosclerotic plaques [92, 93]. Galectin-3 is a profibrotic agent by itself and also mediates aldosterone-induced cardiac, vascular and renal fibrosis [91, 94]. High galectin-3 levels in the myocardium stimulate excessive collagen production [95] and are correlated with abundant macrophages, increased fibroblast activity and increased accumulation of extracellular matrix [96]. Galectin-3 levels also show a later peak in non-infarcted, remodeling areas in rat models of myocardial infarction [97]. Thus, galectin-3 is a marker of cardiac fibrosis and remodeling (Figure 5).

Clinical studies

Chronic heart failure

In the above-mentioned context, it is not surprising that galectin-3 is a biomarker for chronic HF prognosis [91]. Although galectin-3 lost its predictive power for future adverse outcome in chronic HF after adjusting for NT-proBNP in some studies [98, 99], it remains a significant independent predictor of all-cause mortality [14], adverse CV events (including cardiac death) and left ventricular remodeling in patients with left ventricular systolic dysfunction in most trials [14, 100, 101]. It is also a significant independent predictor of all-cause death and hospitalization in patients with HF with preserved ejection fraction [102].

Acute heart failure

Galectin-3 is also a promising biomarker in acute heart failure (AHF). In a pooled analysis from 3 cohorts of patients admitted to hospital for AHF (AHF patients from COACH, PRIDE and UMD H-23258 trials), galectin-3 was a significant predictor of rehospitalization for HF at 30, 60, 90 and 120 days, independently of New York Heart Association (NYHA) functional class, renal function, left ventricular ejection fraction and BNP [103]. It was also a significant independent predictor of the composite outcome all-cause mortality and HF rehospitalization in PRIDE and UMD H-23258 cohorts [103].

Non-heart failure subjects

Galectin-3 may also be used as a biomarker for CV adverse outcome in non-HF individuals. Interestingly, galectin-3 significantly and independently predicted incident HF and all-cause mortality in the largest population-based cohort in which the relationship between galectin-3, HF and mortality risk was assessed (FINRISK 1997 cohort) [104].


Renal function seems to be an important confounder when assessing the prognostic value of galectin-3: the association between high levels of galectin-3 and prognosis of HF was lost after adjusting for eGFR in some studies [105, 106]. Galectin-3 levels strongly correlate with eGFR (inverse relationship) in HF patients [14]. Therefore, the interpretation of galectin-3 should take into consideration renal function.


The use of the galectin-3 assay is currently approved by the FDA for the prognosis of chronic HF together with clinical assessment [91]. The 2013 American College of Cardiology Foundation/American Heart Association (ACCF/AHA) Guideline for management of HF also states that galectin-3 may be considered an additional biomarker for both chronic (class IIb recommendation, level of evidence B) and acute HF (class IIb recommendation, level of evidence A) improved risk stratification [8]. Whether galectin-3 may be useful in predicting CV risk in non-HF patients still needs to be established.

Galectin-3 vs. standardly used biomarkers

Galectin-3 is a prognostic marker for all-cause mortality and rehospitalization in chronic HF, independently of NP [8, 14, 100, 101]. Also, galectin-3 adds prognostic information to that provided by NT-proBNP in HF patients with NT-proBNP above the median (Table IV) [107].
In a recent head-to-head comparison of ST-2 and galectin-3 for risk stratification in chronic HF performed by Bayes-Genis et al. [108], ST-2 proved superior: ST-2 brought a significant increase in the predictive power of a risk model for HF composed of 11 classical risk factors and NT-proBNP, while the contribution of galectin-3 was negligible – hence the observation that galectin-3 may be more useful in early stages of HF and the need for trials that investigate the predictive utility of galectin-3 according to HF stages [108].
Despite NT-proBNP being more sensitive than galectin-3 in diagnosing AHF, galectin-3 was a better predictor for 60-day mortality and for the composite end-point death and recurrent HF within 60 days in AHF patients. The combination of galectin-3 and NT-proBNP best predicts death/recurrent HF in AHF [109].
Peacock [110] developed an algorithm for the emergency department recommending managing HF presentations (emergency department treatment and discharge, observation unit admission with 24-hour re-evaluation or immediate hospitalization) according to BNP and galectin-3 levels. The algorithm has not yet been validated. Galectin-3 in combination with NT-proBNP may be useful in short-term risk reclassification of patients with AHF and could help decision-making in order to better identify candidates for admission to intensive care units and candidates for discharge.

The multimarker approach

Cardiovascular disease have multiple pathophysiological backgrounds: HF is a result of inflammation, myocardial remodeling, cardiomyocyte injury and neurohormonal activation, while CHD is the result of vascular inflammation, atherosclerosis, thrombosis and ED. Therefore, a multibiomarker assessment could provide a global assessment of the disease, thus increasing the predictive and prognosis accuracy. Also, despite its limited utility when used alone, a biomarker may still be helpful when integrated into a biomarker panel [5]. In this regard, Ky et al. [111] investigated the utility of a panel consisting of 8 biomarkers reflecting different biological processes as a prognostic tool in chronic HF. Established biomarkers such as troponin I, BNP, ST-2, CRP, creatinine, and uric acid were included together with markers of oxidative stress and vascular growth and remodeling. The multimarker score significantly reclassified 24% of patients as higher risk when added to clinical risk scores.
The difficulty consists in identifying those multibiomarker panels that perform best for the minimum cost and are easy to assay. Also, the optimal biomarker panel should best guide therapeutic management [111]. As numerous potential biomarkers have been discovered, now the great challenge is to identify the optimal multibiomarker test.
Most of the above-mentioned molecules proved to be significant predictors of CVD and associated mortality, alone and in conjunction with traditional biomarkers. The combinations of biomarkers that are promising for further analysis in clinical trials are presented in Table V.


Combining various new risk markers could help improve risk-based intervention and achieve the optimal therapeutic approach, as traditional CV risk factors are in many cases not able to provide a clear assessment of risk strata. Nevertheless, CT-1 is a promising biomarker for assessing risk in hypertensive patients. It would allow the identification of patients at high risk for developing HF, and it could also be a useful tool for assessing treatment outcome. High leptin, low adiponectin and high resistin levels are biomarkers of vascular inflammation, dysfunction, atherosclerosis, and increased stiffness and could be used to predict CV disease and outcome, according to the underlying CV state. Galectin-3 is already recommended for establishing prognosis in both acute and chronic HF patients. Although clinical trials have also shown promising results for galectin-3 as an independent prognostic factor for assessing CV risk in non-HF patients, its best predictive value seems to be in high-risk patients.
Most studies are in favor of using the above-mentioned molecules as new biomarkers for CVD and mortality. The practical use of a multi-biomarker evaluation in conjunction with risk score models already available could bring valuable information regarding disease or risk prognosis, especially as these new biomarkers promise to bring a significant increase in the predictive power of already established biomarkers (e.g. BNP) and/or clinical factor algorithms.


This work received financial support through the “CERO - CAREER PROFILE: Romanian researchers”, contract no. POSDRU/159/1.5/S/135760, a project co-financed by the European Social Fund Operational Programme Human Resources Development 2007-2013.
Simona Hogas, Stefana C. Bilha – These authors contributed equally to this work.

Conflict of interest

The authors declare no conflict of interest.


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