Association Between Lipid Profile and Clinical Manifestations in Sickle Cell Anemia: A Systematic Review

Abstract

Introduction  Sickle cell anemia (SCA) is a genetic disease associated with frequent episodes of acute illness. Changes in the lipid profile and a chronic inflammatory process make up the molecular aspects observed in this disease. Associations between these mechanisms and clinical manifestations could thus define severity profiles and therapeutic strategies.

Objectives  To verify whether there is an association between lipid profile and clinical manifestations in patients with SCA and if there is a correlation between lipid profile and laboratory markers in this disease.

Methodology  According to the PRISMA guidelines, a systematic review of the literature was conducted by searching the MEDLINE/PubMed, LILACS, SciELO, Scopus, and Cochrane databases. Articles were screened by reading the titles and abstracts, reaching those selected for full-text reading. The included studies were published between 2010 and 2020, were fully available in the databases, and addressed the proposed theme. The risk of individual bias was assessed by using the Joanna Briggs Institute checklist and the Newcastle-Ottawa scale.

Results  Out of the 144 identified articles, 15 were selected for analysis, resulting in a sample size of 2,230 individuals. HDL-C, LDL-C, total cholesterol , and triglycerides were the main variables analyzed in the lipid profiles. A correlation was observed between these variables and some of the most relevant clinical events in the disease, including vaso-occlusive seizures and acute thoracic syndrome.

Conclusion  Lipid metabolism disorders, especially hypocholesterolemia and hypertriglyceridemia, are linked to clinical events observed in SCA, suggesting they play a relevant role in the multifactorial pathogenesis of this disease.

Anemia, Sickle Cell; Lipids; Signs and Symptoms

Introduction

Sickle cell anemia (SCA) belongs to the subgroup of hereditary hemolytic anemias; its etiology is associated with a point mutation in the β-globin gene, which has as final consequences the polymerization of deoxygenated hemoglobin molecules and sickle-shaped cells with a reduced average life span. The main repercussions of the disease derive from the vascular obstruction caused by abnormal hemoglobin (HbS), causing progressive ischemic lesions in different organs.

Every year, 250,000 children with SCA are born worldwide.² In Brazil, this number reaches 3,500 new cases/year.³ being the most frequent hereditary disease in the country.⁴ It is a chronic inflammatory disease permeated with acute events, with high morbidity and early mortality.⁵

The pathophysiology of SCA is complex, involving changes in lipid metabolism, endothelial dysfunction, and hemolysis, in addition to a chronic inflammatory process. These mechanisms are associated with markers of disease severity.

Changes in the lipid profile of patients with SCA have been well documented by several studies. Low levels of total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), and low-density lipoprotein cholesterol (LDL-C) define hypocholesterolemia, while increased triglycerides reveal hypertriglyceridemia.⁶ - ¹⁰ Several hypotheses may explain these findings, but lack scientific evidence.⁶ Studies on dyslipidemia in patients with SCA have been restricted to cholesterol metabolism, and a knowledge gap remains on how this lipid alteration is associated with comorbidities of the disease. The aim of this study was thus to verify whether there is an association between lipid profile and clinical manifestations of SCA.

Methods

Study Design

This is a systematic review based on recommendations by the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA); its protocol was registered in the International Prospective Registry of Systematic Reviews (PROSPERO) under registration number CRD42020214778.

Search Strategy

The search and selection of studies were performed in the MEDLINE/PubMed, LILACS, SciELO, Scopus, and Cochrane databases. Each database was explored using an individualized strategy consisting of descriptors among the Medical Subject Headings (MeSH) and Health Sciences Descriptors (DeCS) corresponding to "sickle cell anemia," "sickle cell disease," "lipids," "lipid," "clinical manifestations," "signs," "symptoms," and "comorbidity." Additionally, a manual search was performed in the reference lists of the selected articles to uncover studies missed in the database searches. The databases were last accessed on October 25, 2020.

Eligibility Criteria

Original studies published and available in full in the scientific databases or in printed versions, such as observational studies (cross-sectional, cohort, and case-control), experimental studies (clinical trials), and review studies, published between 2010 and 2020, in English and/or Portuguese, addressing the association between lipid profile and clinical manifestations in patients with SCA. Letters to the reader, editorials, and duplicate papers were excluded, as well as studies that did not present the subject of this review in the title, abstract, or full text.

Selection of Studies

Two independent researchers pre-selected the studies by reading the titles and abstracts, following the predefined inclusion and exclusion criteria. A third researcher evaluated the articles in which there was disagreement, completing the selection of articles for full-text reading. In the last selection stage, the full length of each study was analyzed, applying the same selection criteria, to reach the final list of articles included in the review.

Methodological Quality

The methodological quality of the studies was assessed using the Joanna Briggs Institute (JBI) Critical Appraisal Checklist for Analytical Cross-Sectional Studies, the most recommended tool for the analysis of cross-sectional studies, in addition to the Newcastle-Ottawa scale, which evaluated a single cohort study. Two independent researchers judged the quality/risk of bias of the studies.

Results

A total of 144 citations were identified in the electronic databases. After removal of duplicate articles and selection by reading the titles, abstracts, and full texts, 15 articles were included in our qualitative synthesis. The flowchart presenting the study selection process is presented in Figure 1 .

Figure 1
Study selection flowchart.

Characteristics of the included studies

Among the 15 selected articles, 14 were cross-sectional studies and one was a cohort study. The years of publication ranged from 2010 to 2020. The sample size ranged from 81 to 367 participants, with a total of 2,230 individuals included in all 15 studies; 1,849 (82.9%) participants had sickle cell disease and 381 (17.1%) were healthy individuals. HDL-C was analyzed in all studies. TC, triglycerides (TG), and LDL-C were analyzed by 14, 13, and 12 studies, respectively. Very low-density lipoprotein (VLDL) and TG/HDL appeared in five of the articles and non-HDL C was reported in two studies, while pro-HDL and TC /HDL were mentioned by one study each. Table 1 presents the characteristics of the studies, the analyzed variables, and their main results.

Table 1
Characterization of the included studies

	Author (year of publication)	Country	Title	Population	Lipid profile analyzed	Main results
1	Aleluia MM et al. (2017)	Brazil	Association of classical markers and establishment of the dyslipidemic subphenotype of sickle cell anemia	99 HbSS patients in steady state	TC HDL-C LDL-C VLDL-C TG	HDL-C levels greater than 40.0 mg/dL were associated with an improvement in hematological parameters (red blood cell count, Hb, and Ht), in addition to an increase in HbF.
2	Ataga KI et al. (2015)	USA	Association of pro-inflammatory high-density lipoprotein cholesterol with clinical and laboratory variables in sickle cell disease	117 patients with sickle cell disease: (91 HbSS; 13 HbSC; 5 HbSβ0-thalassemia and 8 HbSβ+ -thalassemia) in addition to 11 healthy patients (control)	TC HDL-C Pro-HDL	Pro-HDL was increased in patients with suspected pulmonary hypertension and decreased in patients with history of priapism. TC was reduced in patients with suspected pulmonary hypertension. There was a trend towards lower TC levels in patients with history of priapism and ulcers in the lower limbs. HDL was also decreased in patients with history of priapism.
3	Akinlade KS et al. (2014)	Nigeria	Defective lipid metabolism in sickle cell anaemia subjects in vaso-occlusive crisis	58 HbSS adults (30 in steady state and 28 in vaso-occlusive crisis) in addition to 24 healthy adults (control)	TC HDL-C LDL-C TG TG/HDL	TC, LDL, TG, and TG/HDL were significantly reduced while HDL was increased in patients in vaso-occlusive crisis when compared to patients in a stable disease state.
4	Adegoke SA et al. (2016)	Nigeria	Electrocardiographic abnormalities and dyslipidaemic syndrome in children with sickle cell anaemia	62 HbSS children and 40 healthy people of the same age group	TC HDL-C LDL-C TG	TG levels showed a positive correlation with the PR interval. Mean TG levels were significantly elevated in patients with SCA and ECG abnormalities compared to those with a normal ECG.
5	Rissatto-Lago MR et al. (2018)	Brazil	Hidden hearing loss in children and adolescents with sickle cell anemia	37 HbSS patients in steady state and 44 healthy controls (all 6-18 years of age)	TC HDL-C LDL-C TG TG/HDL	No association was observed between lipid profile and increased acoustic reflex thresholds.
6	Teixeira RS et al. (2019)	Brazil	Higher TG/HDL-cholesterol ratios hallmark disease severity in children and adolescents with sickle cell anemia	55 HbSS patients in steady state and 41 healthy controls (all 6-18 years of age)	TC HDL-C LDL-C TG TG/HDL	Elevated TG/HDL in patients with SCA was associated with more episodes of acute chest syndrome and vaso-occlusive crises. TG/HDL also had a positive correlation with LDH, WBC count, and flow velocity in the right and left cerebral arteries, in addition to a negative correlation with Hb levels.
7	Guarda CC et al. (2020)	Brazil	Investigation of Lipid Profile and Clinical Manifestations in SCA Children	126 HbSS patients in steady state	TC HDL-C LDL-C VLDL-C TG	Patients with history of pneumonia had increased levels of TC and LDL-C. Previous history of lower limb ulcers was associated with reduced LDL-C levels. Individuals with history of pain crises presented elevated HDL-C levels.
8	Seixas MO et al. (2010)	Brazil	Levels of high-density lipoprotein cholesterol (HDL-C) among children with steady-state sickle cell disease	152 HbSS children in steady state and 132 healthy children	TC HDL-C LDL-C VLDL-C TG	Decreased HDL-C levels were associated with a history of cardiac abnormalities, pneumonia, and need for blood transfusion. Elevated levels of TC, LDL-C, VLDL-C, and TG were associated with the occurrence of cholelithiasis.
9	Zorca S et al. (2010)	USA	Lipid levels in sickle-cell disease associated with haemolytic severity, vascular dysfunction and pulmonary hypertension	328 adults with SCA in a stable state (250 SS or Sβ0 and 78 SC or Sβ+) and 39 healthy controls	TC HDL-C LDL-C TG	TC, HDL-C, and LDL-C were inversely correlated with anemia severity, but not with markers of pulmonary hypertension (NT-proBNP and TRV). Serum TG levels were positively correlated with markers of pulmonary hypertension.
10	Lalanne-Mistrih ML et al. (2018)	Guadalupe (France)	Lipid profiles in French West Indies sickle cell disease cohorts, and their general population	159 adults with SCA in steady state (97 HbSS and 62 HbSC)	TC HDL-C LDL-C TG	Patients with elevated TG showed history of acute chest syndrome more frequently. Acute chest syndrome, vaso-occlusive crises, and osteonecrosis were not affected by TC, HDL-C, and LDL-C levels.
11	Lamarre Y et al. (2013)	Guadalupe (France)	Male Gender, Increased Blood Viscosity, Body Mass Index and Triglyceride Levels Are Independently Associated with Systemic Relative Hypertension in Sickle Cell Anemia	97 HbSS adults in steady state	TC HDL-C LDL-C TG	Elevated TG levels could increase the risk of developing relative hypertension (BP ≥ 120/70 mmHg and < 140/90 mmHg) in SCA. Patients with borderline/elevated TG levels had history of acute chest syndrome and vaso-occlusive crises more frequently.
12	Ephraim RKD et al. (2016)	Gana	Normal Non-HDL Cholesterol, Low Total Cholesterol, and HDL Cholesterol Levels in Sickle Cell Disease Patients in the Steady State: A Case-Control Study of Tema Metropolis	50 patients with SCA (12 HbSS and 38 HbSC) in a stable state and 50 healthy controls	TC HDL-C LDL-C VLDL-C Non-HDL TG TG/HDL	Increased VLDL was inversely correlated with systolic blood pressure and positively correlated with diastolic blood pressure.
13	Valente-Frossard TNS et al. (2020)	Brazil	Polymorphisms in genes that affect the variation of lipid levels in a Brazilian pediatric population with sickle cell disease: rs662799 APOA5 and rs964184 ZPR1	161 children and adolescents with SCA (92 HbSS and 69 HbSC) in a stable state	TC HDL-C Non-HDL TG CT/HDL TG/HDL	Decreased HDL-C levels were associated with elevated markers of hemolysis and inflammation. Elevated TG levels were correlated with lower concentrations of Hb and HDL-C, in addition to an increase in leukocytes, LDH, and bilirubin.
14	Darbari DS et al. (2013)	USA	Severe painful vaso-occlusive crises and mortality in a contemporary adult sickle cell anemia cohort study	264 HbSS adults	HDL-C	Elevated HDL was associated with a higher frequency of vaso-occlusive crises.
15	Emokpae A, Kuliya-Gwarzo A (2014)	Nigeria	The influence of decreased levels of high density lipoprotein cholesterol on hematological indices in sickle cell disease patients	84 patients with SCA in a stable state (all from 15 years old)	TC HDL-C LDL-C VLDL-C TG	Patients with reduced HDL-C levels had more severe anemia and a greater need for blood transfusions compared to those with normal HDL.

• Note: All studies included in the review adopted a statistical significance level of 5%.

Main outcome

A reduction in HDL-C levels was associated with history of cardiac abnormalities, pneumonia, priapism, and greater need for blood transfusion, in addition to hematological parameters of more severe anemia (2, 8, and 9). Two studies showed that high HDL-C levels were related to a higher frequency of vaso-occlusive seizures (VOS) (7 and 14). Decreased TC levels were found in patients with suspected pulmonary hypertension (PH), history of priapism and ulcers in the lower limbs, and individuals with VOS (2 and 3); they were also correlated with more severe anemia (1). Elevated TC levels were associated with cholelithiasis (8) and a history of pneumonia (7). Increased TG levels showed a positive correlation with cholelithiasis (8), in addition to electrocardiographic abnormalities (4), history of acute thoracic syndrome (ATS), VOS, more severe anemia (6), elevated markers of PH (9), and relative hypertension in patients with SCA (BP ≥ 120/70 mmHg and < 140/90 mmHg) (11). Conversely, one study showed a negative correlation between VOS and TG, as well as between VOS and LDL-C (3). LDL-C also showed a negative correlation with lower limb ulcers (6) and anemia severity (7), and a positive correlation with cholelithiasis (8) and pneumonia (6). Elevated VLDL levels were also associated with cholelithiasis (8), reduced systolic blood pressure, and increased diastolic blood pressure (12). Pro-HDL showed a positive correlation with suspected PH and a negative correlation with priapism (2). High TG/HDL ratios were associated with a higher number of ATS and VOS episodes and had a positive correlation with lactate dehydrogenase (LDH), leukocyte count, and flow velocity in the right and left cerebral arteries; a negative correlation with Hb levels was also observed for this parameter (6). In one of the studies, ATS, VOS, and osteonecrosis were not affected by TC, HDL-C, and LDL-C levels (10); in another study, no correlation was found between these parameters and markers of PH (9). One study explored hearing loss in patients with SCA, not verifying any associations between lipid profile and such outcome (5).

Quality of the included studies

In the evaluation of cross-sectional studies, among the 14 articles analyzed in this review, 12 presented a low risk of bias (70%-100% of "Yes" answers in the JBI checklist), while 2 studies were classified as having a moderate risk of bias (50%-69% of "Yes" answers) – Appendix I. The main limitations of cross-sectional studies were the identification and control of potential confounding factors. Some of the studies also did not specify the criterion used to confirm the HbSS genotype (eg, hemoglobin electrophoresis or liquid chromatography). The only cohort study included in this review was evaluated with the Newcastle-Ottawa Scale for Cohort Studies – Appendix II, which showed a high level of evidence (8 in a 9-point scale).

Discussion

The alterations in lipid metabolism found in patients with SCA are marked by hypocholesterolemia and hypertriglyceridemia. The main mechanisms proposed to justify hypocholesterolemia are: (1) increased cholesterol consumption for the synthesis of new red blood cells due to lower survival or increased hemolysis; and (2) dilution of serum cholesterol by decreased erythrocytic mass and increased plasma volume.¹¹ In addition, reduced liver function can lead to lower cholesterol production and increased TG. Chronic anemia induces catabolism, which generates greater release of free fatty acids; their increased supply to the liver leads to higher TG production.

The analyzed studies showed an association between lipid profile and clinical events observed in SCA . HDL-C, TC, TG, and LDL-C were among the most frequently explored variables.

Five studies showed an association between reduced HDL-C levels and clinical complications or markers of more severe anemia. Low HDL-C was found in patients with history of priapism by Ataga et al. (2015);¹² history of cardiac abnormalities, pneumonia, and greater need for blood transfusion were found by Seixas MO et al. (2010).¹³ Therefore, HDL was not only a potential biomarker of clinical severity, but also linked to laboratory worsening of the disease. Regarding TC, Zorca et al. (2010)¹⁴ reported an inverse correlation between TC levels, HDL-C, and LDL-C and anemia severity. This evidence was corroborated by Valente-Frossard et al. (2020)¹⁵ and Emokpae, Kuliya-Gwarzo (2014),¹⁶ who also observed worsening of inflammation, with increased leukocytes, monocytes, and platelets. Emokpae reinforced the correlation between reduced HDL-C and a greater need for blood transfusions, in addition to a higher frequency of VOS. In this sense, Aleluia et al. (2017)¹⁷ bring evidence of a direct association between HDL-C and fetal hemoglobin (HbF ), whose role is important to prevent the polymerization of HbS and increase the survival of red blood cells, consequently reducing the occurrence of VOS and hemolysis.¹⁸ , ¹⁹ Lower HbF levels thus may represent one of the pathophysiological mechanisms that lead to a greater severity of SCA in patients with low HDL-C.

Conversely, two retrospective studies, Guarda et al. (2020)²⁰ and Darbari et al. (2013),²¹ found an association between higher HDL-C levels and more frequent VOS. Lalanne-Mistrih et al. (2018),²² also through a retrospective analysis, did not detect a correlation between clinical history of VOS and this lipid component. However, due to their retrospective nature, these studies present a higher risk of bias. It is noteworthy that VOS result from a pathological process that involves oxidative stress, increased expression of endothelial adhesion molecules, inflammatory cytokines, and nitric oxide depletion. These factors, associated with a lipid profile disorder, create a positive feedback loop for the chain of inflammation that leads to vaso-occlusive phenomena.²³

In patients with SCA, PH has already been attributed to endothelial injury resulting from chronic hemolysis, smooth muscle dystonia, and nitric oxide depletion vasculopathy.²⁴ However, Ataga et al. (2015)¹² observed reduced TC levels in patients with suspected PH when compared to those without this suspicion, as well as a negative correlation between TC and soluble vascular cell adhesion molecule-1 (sVCAM-1), suggesting that hypocholesterolemia contributes to the endothelial activation involved in PH. In disagreement, Zorca et al. (2010)¹⁴ did not identify an association between TC and markers of PH, such as N-terminal B-type natriuretic peptide (NT-proBNP) and tricuspid regurgitation velocity (TRV), or a correlation with markers of endothelial dysfunction, including sVCAM-1.

Guarda et al. (2020)²⁰ reported high TC levels in patients with history of pneumonia. It is known that pulmonary complications in SCA are associated with vascular damage and vasoconstriction, proposing a significant involvement of cholesterol in these mechanisms. The occurrence of pneumonia in SCA is often associated with ATS, and these conditions often overlap. However, in a study conducted by Lalanne-Mistrih et al. (2018),²² ATS was not affected by TC levels. These data suggest that the role of cholesterol in pulmonary events still needs to be defined.

Cholelithiasis was associated with high levels of TC, LDL-C, VLDL-C, and TG, according to Seixas et al. (2010).¹³ It is understood that these lipids have an indirect effect on the formation of gallstones, considering that stones seen in patients with SCA and other hemolytic anemias are pigmented, composed mainly of calcium bilirubinate, and caused by indirect hyperbilirubinemia secondary to chronic hemolysis.

Lower levels of LDL-C were found in patients with history of lower limb ulcers, while above-average levels were observed in patients with history of pneumonia.²⁰ Several mechanisms have been suggested to explain the pathophysiology of ulcers in SCA, including physical obstruction caused by sickle red blood cells, poor venous recirculation, reduced nitric oxide bioavailability, and susceptibility to infections. Lipid alterations are thus understood as part of a multifactorial pathogenic process and not as a direct causative agent of this clinical complication.

The higher prevalence of electrocardiographic abnormalities in patients with SCA is well demonstrated when comparing them to healthy individuals. Adegoke et al. (2016)²⁵ demonstrated that children with SCA were six times more likely to present left ventricular hypertrophy and had a higher prevalence of first-degree atrioventricular block and T-wave alterations compatible with lateral ischemia. These changes result from an increased cardiac output secondary to chronic anemia, leading to volume overload and eccentric hypertrophy.⁴⁴ This study also demonstrated higher TG levels in children with SCA and electrocardiographic abnormalities, suggesting that dyslipidemia is a potential biomarker for electrocardiographic changes in these patients. In this perspective, TG were significantly correlated with markers of hemolysis, endothelial activation, and inflammation, being directly linked to vascular dysfunction; the repercussions of this dysfunction occur in both the macro and microcirculation, harming different vascular sites, including the heart.

Zorca et al. (2010)¹⁴ showed a positive correlation of TG with NT-proBNP and TRV, which are markers of PH. It is thus possible that the vasculopathy induced by hypertriglyceridemia has as its main target, within SCA, the pulmonary vasculature, contrary to what is observed in the general population in which the most affected tissues are the coronary and cerebral arteries. Still considering the effects of this vasculopathy, Lalanne-Mistrih et al. (2018)²² reported a higher frequency of ATS in patients with high TG levels; this evidence was ratified by Lamarre et al. (2013),²⁶ who also observed an association with a higher frequency of VOS. These outcomes attest to the negative impact of TG on vascular function. In addition, increased systolic blood pressure, even if lower than 140 mmHg, is associated with an increased risk of stroke and mortality in patients with SCA. To this condition, Lamarre attributed the term "relative hypertension," demonstrating that increased TG levels were a relevant risk factor for its development.

The TG/HDL ratio is also an important lipid parameter. This marker shows a strong correlation with cardiovascular risk, being a good predictor of acute myocardial infarction²⁷ - ³⁰ and associated with insulin resistance.³¹ , ³² A study by Teixeira et al. (2019)³³ found the role of TG/HDL as a marker of vascular damage in patients with SCA, finding correlations with markers of hemolysis (LDH and hemoglobin) and with the increase in blood flow velocity in the middle cerebral arteries on transcranial Doppler; this last parameter is an important predictor of stroke in these patients. Vascular damage was also evident by the association of an increased TG/HDL ratio with a higher number of episodes of ATS and VOS: children with TG/HDL values above 2.93 were 3.77 times more likely to present at least one of these clinical events.

The possible limitations of this review are linked to disparities between the populations of the included studies, such as the heterogeneity in sample sizes, age groups, and SCA phenotypes. On the other hand, the low risk of bias in most of the included studies and the rigor in complying with the PRISMA protocol ensure the methodological quality of this study. The registration in PROSPERO qualifies the transparency and scientific integrity of this review.

Conclusion

Lipid metabolism disorders, especially hypocholesterolemia and hypertriglyceridemia, are linked to the occurrence of clinical events observed in patients with SCA, suggesting a relevant role in the multifactorial pathogenesis of this disease.

This study demonstrated the association between lipid profile and clinical events in SCA, as well as a correlation between lipids and laboratory markers of the disease. The derangement of the lipid metabolism, marked by hypocholesterolemia and hypertriglyceridemia, was found to be linked to clinical manifestations that constitute a more severe course of the disease, suggesting an important involvement of these lipids in the processes of inflammation and vascular damage that comprise the multifactorial pathogenesis of SCA.

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• Study Association
  This study is not associated with any thesis or dissertation work.
• Ethics approval and consent to participate
  This article does not contain any studies with human participants or animals performed by any of the authors.

• Sources of Funding: There were no external funding sources for this study.

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Publication Dates

• Publication in this collection
  19 Aug 2022
• Date of issue
  Nov-Dec 2022

History

• Received
  3 Feb 2022
• Reviewed
  20 Apr 2022
• Accepted
  11 June 2022