Association between galectin-3 and hepatosteatosis in a community-based cross-sectional study

Abstract

Background:

Hepatosteatosis is a common condition that can lead to cirrhosis and liver cancer. Galectin-3 (GAL-3) has been implicated in liver fibrosis and inflammation.

Objectives:

The purpose of this study was to investigate the association between GAL-3 and hepatosteatosis.

Design:

This study is a retrospective secondary analysis of data from a community health screening program.

Methods:

A total of 766 participants were included in the final analysis. Hepatosteatosis was diagnosed using ultrasonography, and GAL-3 levels were measured using enzyme-linked immunosorbent assay. Logistic regression analysis was used to examine the association between GAL-3 levels and the presence of hepatosteatosis, adjusting for age, sex, and other potential confounding factors.

Results:

The prevalence of moderate-to-severe hepatosteatosis in the study population was 31.5%. The participants with hepatosteatosis had a significantly higher mean level of GAL-3 compared to those without hepatosteatosis (16.6 ± 7.3 vs 13.5 ± 7.3 ng/ml; p < 0.001). After adjusting for age, sex, body mass index, and other potential confounding factors, a higher level of GAL-3 was significantly associated with an increased risk of moderate-to-severe hepatosteatosis (adjusted odds ratio (aOR) 1.24, 95% confidence interval (CI) 1.05–1.46, p = 0.010). The coexistence of alanine transaminase/aspartate transaminase ratio >1 and GAL-3 >14.4 ng/ml was associated with a significantly increased risk (aOR 3.37, 95% CI: 1.90–5.99, p < 0.001).

Conclusion:

Our findings suggest that GAL-3 level is significantly associated with the presence of moderate-to-severe hepatosteatosis, independent of other known cardiometabolic risk factors.

Keywords

ALT/AST ratio galectin-3 hepatosteatosis metabolic syndrome waist-to-height ratio

Introduction

Hepatosteatosis is one of the most common causes of chronic liver disease globally,¹ and the prevalence has dramatically increased due to the increase in obesity, type 2 diabetes mellitus, and metabolic syndrome (MetS).² A population-based observational study reported that the global prevalence of hepatosteatosis was 25.24%, with the highest prevalence in the Middle East and South America, followed by Asia and North America.¹ However, of note, the prevalence was shown to vary based on factors such as age, sex, and race, and further research on biomarkers is required to identify regional variations.

This study explored the feasibility of quantitative ultrasonography as a simple screening method for hepatosteatosis and its severity at the community level. Beyond several cardiometabolic indices such as MetS and waist-to-height ratio (WHR),³ a higher alanine transaminase/aspartate transaminase (ALT/AST) ratio would increase new onset hepatosteatosis.⁴ Early studies have also demonstrated that galectin-3 (GAL-3) may contribute to the progression of cancer,⁵ and it is also well known to play a role in tissue repair, cardiac remodeling, fibrogenesis, and inflammation in heart failure.⁶ Moreover, research on GAL-3 suggests that it may be an important protein in the pathophysiology of cardiometabolic disorders,⁷ and also that it may play a role in the development of steatohepatitis^8,9 and fibrosis.¹⁰ GAL-3 has been shown to positively regulate CD36 transcription through increasing peroxisome proliferator-activated receptor activation, thereby causing fatty acid uptake and hepatosteatosis.¹¹ The inhibition of GAL-3 has been shown to improve and prevent the progression of fibrosis, and it has been tested in phase III clinical trials in patients with nonalcoholic steatohepatitis.¹² Furthermore, a recent study found that the inhibition of GAL-3 could abolish the hepatoprotective effects conferred by GAL-3 by promoting proptosis, but not necroptosis.¹³ Nevertheless, a United Kingdom biobank investigation did not find a causal interaction between GAL-3 and hepatosteatosis.¹⁴

In spite of multiple unknown cardiometabolic indices, we still hypothesized that GAL-3 may be strongly associated with the existence of fatty liver. Therefore, the aim of this study was to examine the influence of GAL-3 on hepatosteatosis in a community-based cohort.

Methods

Population and study design

This retrospective cross-sectional study enrolled adult patients in southern Taiwan who attended annual checkups between 2017 and 2019. All of the participants provided informed consent and completed a questionnaire before enrollment. Anthropometric measurements, laboratory results, and hepatitis virus markers were then collected, and a serum sample was stored in the biobank of Chung Gung Memorial Hospital (CGMH) in Chiayi. Written informed consents for the use of stored remaining specimens were obtained from all patients prior to the participation in the study. The Ethics Committee and Institutional Review Board of Chang Gung Memorial Hospital approved this study on October 15, 2021 (IRB No. 202101596B0). A total of 800 samples were used for biomarker analysis. After excluding participants with incomplete data, 766 participants were included in the final analysis (Figure 1).

Figure 1.

Study enrollment flow chart.

Anthropometric measurements

Blood pressure was measured twice in each participant using an electronic sphygmomanometer (Omron HEM-1000, 6 MCN0937000; Dalian Co., Ltd, Dalian, China) in a seated position after 10 min of rest. Mean arterial pressures were measured during both the diastolic and systolic phases. Waist circumference was measured directly between the lowest rib and iliac crest with the participants standing. All measurements were performed by a trained nurse in accordance with standard procedures.

Laboratory analysis

Blood samples were collected from each participant after 12 h of fasting, and then tested in the laboratory at CGMH. The biochemical tests included serum creatinine (Cr), AST, alanine aminotransferase (ALT), fasting sugar, uric acid, triglycerides (TGs), low-density lipoprotein, high-density lipoprotein (HDL-C), total cholesterol, and apolipoprotein B (apo-B) (Roche Diagnostics, Mannheim, Germany; Cobas 6000, C501). Hemograms were performed using an XN-3000 system (Sysmex Taiwan Co., Ltd, Taipei, Taiwan). The platelet-to-lymphocyte ratio (PLR) was calculated by dividing the platelet count by the lymphocyte count, and the neutrophil-to-lymphocyte ratio (NLR) by dividing the neutrophil count by the lymphocyte count.

Biomarkers associated with hepatosteatosis

Serum levels of GAL-3, interleukin-6 (IL-6), and lipoprotein(a) were determined using enzyme-linked immunosorbent assays (GAL-3 and IL-6: Elabscience, Houston, TX, USA; lipoprotein(a): Abcam, Cambridge, UK).

Moderate-to-severe fatty liver defined by ultrasonography

The grading of hepatosteatosis is usually assessed using ultrasonography features including liver brightness, contrast between the liver and the kidneys, and appearance of the intrahepatic vessels, liver parenchyma, and diaphragm. Steatosis was graded as follows: absent (score 0) when the echotexture of the liver was normal; mild (score 1) when there was a slight and diffuse increase in liver echogenicity with normal visualization of the diaphragm and portal vein wall; moderate (score 2) when there was a moderate increase in liver echogenicity with slightly impaired appearance of the portal vein wall and diaphragm; and severe (score 3) when there was a marked increase in liver echogenicity with poor or no visualization of the portal vein wall, diaphragm, and posterior part of the right liver lobe.¹⁵ Moderate-to-severe hepatosteatosis was defined as a score 2 + 3 compared with “controls” group as score 0 + 1.

Statistical analysis

The demographic characteristics of the participants according to the grade of hepatosteatosis were compared using independent sample t-tests for continuous variables and Chi-square tests for categorical variables. The continuous data with non-normal distribution should be presented as median (interquartile range, IQR). To identify factors potentially associated with moderate-to-severe hepatosteatosis, univariate logistic regression analysis was conducted using demographics and characteristics as explanatory variables. Based on a multivariable logistic regression model, we calculated odds ratios (ORs) with 95% confidence intervals (CIs) for moderate-to-severe hepatosteatosis after adjusting for age, sex, body mass index (BMI), WHR, and laboratory data. The analysis was conducted with two-tailed tests, and a p-value less than 0.05 was considered significant. Statistical analysis of the data was carried out using SAS version 9.4 (SAS Inc., Cary, NC, USA).

Results

Basic characteristics as determined by hepatosteatosis

A total of 766 participants were recruited and included in the final analysis (Table 1). The average age of the moderate-to-severe hepatosteatosis group was 63.4 ± 9.2 years, which was younger than that of the participants without hepatosteatosis (66.5 ± 10.3 years), and nearly half of them were male (50.1%). The moderate-to-severe hepatosteatosis group had significantly higher BMI, waist circumference, WHR, PLR, ALT/AST ratio, uric acid, TG, HDL-C, apo-B, and fasting sugar, but lower lipoprotein(a) (p < 0.05). Furthermore, we also found that the levels of GAL-3 were significantly higher among those who had moderate-to-severe hepatosteatosis compared to those who had mild hepatosteatosis. However, there were no significant differences in sex distribution, systolic blood pressure, kidney function, NLR, and IL-6 levels between the two groups.

Table 1.

Baseline characteristics of participants.

Variable	Moderate-to-severe hepatosteatosis		Controls		p-Value^a
Variable	n	(%)	n	(%)	p-Value^a
Total	241		525
Age, years					0.007
<65	123	(51.0)	213	(40.6)
⩾65	118	(49.0)	312	(59.4)
Sex					0.938
Male	121	(50.2)	263	(50.1)
Female	120	(49.8)	262	(49.9)
	Median	(Q1–Q3)	Median	(Q1–Q3)	p-Value^b
Age, years	64.0	(57–69)	67.0	(60–74)	<0.001
BMI, kg/m²	27.4	(25.6–29.6)	24.8	(22.6–26.9)	<0.001
WHR	0.6	(0.5–0.6)	0.5	(0.5–0.6)	<0.001
SBP, mmHg	128.0	(89–147)	123.0	(90–142)	0.031
Laboratory data
NLR	1.8	(1.4–2.3)	1.8	(1.3–2.3)	0.936
PLR	7.3	(5.6–9.8)	6.6	(5.4–8.5)	0.008
Cr, mg/dl	0.90	(0.7–1.1)	0.90	(0.7–1.1)	0.824
eGFR, ml/min/1.73 m²	79.0	(69.5–93.8)	80.1	(66.4–97.2)	0.778
ALT/AST ratio	1.2	(1.0–1.5)	1.0	(0.8–1.2)	<0.001
Uric acid, mg/dl	6.1	(5.3–7.3)	5.7	(4.7–6.7)	<0.001
LDL, mg/dl	119.0	(93.0–143.0)	115.0	(93.0–139.0)	0.111
TC, mg/dl	187.0	(161–214)	181.0	(156–211)	0.086
TG, mg/dl	130	(97–173)	97	(70–97)	<0.001
HDL, mg/dl	47	(40–55)	52	(44–62)	<0.001
Apo-B, mg/dl	105	(85–121)	93	(79–113)	<0.001
Fasting sugar, mg/dl	106	(96–125)	100	(93–110)	<0.001
Biomarkers
Lipoprotein(a) (µg/ml)	288.0	(149.5–655.5)	399.0	(196.7–942.7)	0.001
GAL-3 (ng/ml)	15.5	(12.6–18.5)	13.5	(9.3–16.7)	<0.001
IL-6 (pg/ml)	1.9	(1.0–3.7)	1.6	(0.9–3.1)	0.059

Pearson’s Chi-squared tests.

Mann–Whitney U test.

ALT, alanine aminotransferase; apo-B, apolipoprotein B; AST, aspartate transaminase; BMI, body mass index; Cr, creatinine; eGFR, estimated glomerular filtration rate; GAL-3, galectin 3; HDL, high-density lipoprotein cholesterol; IL-6, interleukin-6; LDL, low-density lipoprotein cholesterol; NLR, neutrophil-to-lymphocyte ratio; PLR, platelet-lymphocyte ratio; SBP, systolic blood pressure; TC, total cholesterol; TG, triglyceride; WHR, waist-to-height ratio.

Univariate and multivariate analyses

The results of univariate regression analysis (Table 2) showed that WHR, uric acid, TGs, fasting sugar, ALT/AST ratio, PLR, apo-B, and GAL-3 were associated with a significantly higher risk of moderate-to-severe hepatosteatosis, while age ⩾65 years, HDL-C, and lipoprotein(a) seemed to be inversely correlated with the risk of moderate-to-severe hepatosteatosis. The results of multivariate regression analysis showed that GAL-3, female sex, WHR, uric acid, TGs, ALT/AST ratio, and PLR maintained positive correlations, but only age ⩾65 years remained inversely correlated with moderate-to-severe hepatosteatosis.

Table 2.

Logistic regression analysis of the association between moderate-to-severe hepatosteatosis and clinical variables.

Variable	Crude		Adjusted
Variable	OR (95% CI)	p-Value	OR (95% CI)	p-Value
Age years
<65	Ref.		Ref.
⩾65	0.66 (0.48–0.89)	0.007	0.57 (0.39–0.84)	0.004
Sex
Male	Ref.		Ref.
Female	1.01 (0.75–1.37)	0.938	1.68 (1.10–2.58)	0.016
WHR	3.48 (2.61–4.65)	<0.001	3.08 (2.17–4.38)	<0.001
Laboratory data
Uric acid	1.56 (1.27–1.91)	<0.001	1.36 (1.05–1.77)	0.018
TG	1.74 (1.48–2.05)	<0.001	1.27 (1.05–1.54)	0.013
HDL	0.57 (0.45–0.72)	<0.001	0.80 (0.59–1.09)	0.164
Fasting sugar	1.17 (1.08–1.28)	<0.001	1.01 (0.91–1.13)	0.726
ALT/AST ratio	2.56 (2.03–3.22)	<0.001	1.94 (1.49–2.53)	<0.001
PLR	1.17 (1.02–1.34)	0.029	1.21 (1.03–1.43)	0.018
Apo-B	1.52 (1.24–1.86)	<0.001	1.19 (0.93–1.54)	0.160
Biomarkers
Lipoprotein(a) (µg/ml)	0.77 (0.64–0.94)	0.008	0.89 (0.71–1.11)	0.303
GAL-3 (ng/ml)	1.44 (1.25–1.65)	<0.001	1.24 (1.05–1.46)	0.010

Adjusted: The model was adjusted for sex, age, WHR, uric acid, TG, HDL, fasting sugar, ALT/AST ratio, PLR, Apo-B, lipoprotein(a), and GAL-3.

The ORs calculated for an interquartile range increase in WHR, laboratory data, and biomarkers.

ALT, alanine aminotransferase; apo-B, apolipoprotein B; AST, aspartate transaminase; CI, confidence interval; GAL-3, galectin 3; HDL, high-density lipoprotein cholesterol; OR, odds ratio; PLR, platelet-lymphocyte ratio; TG, triglyceride; WHR, waist-to-height ratio.

The impact of ALT/AST ratio and GAL-3 level on moderate-to-severe hepatosteatosis

A GAL-3 cut-off value of 14.4 is considered to indicate moderate-to-severe hepatosteatosis while ALT/AST ratio >1 reflected a higher risk of nonalcoholic fatty liver disease (NAFLD) in the previous study.⁴ The coexistence of ALT/AST ratio >1 and GAL-3 >14.4 ng/ml was associated with moderate-to-severe hepatosteatosis (aOR 3.37, 95% CI: 1.90–5.99, p < 0.001) (Table 3). The participants with an ALT/AST ratio >1 had higher GAL-3 levels than those with a ratio <1 (Supplemental Figure S1), while the ALT/AST ratio has a distribution difference among the IQR of GAL-3 (Figure 2). After excluding alcohol consumption, the variable distribution and correlation between GAL-3 and NAFLD remained constant in Supplemental Tables S1–S3.

Table 3.

Logistic regression analysis of the association between moderate-to-severe hepatosteatosis and different ALT/AST ratios and GAL-3 groupings.

Groupings	Crude		Adjusted
Groupings	OR (95% CI)	p-Value	OR (95% CI)	p-Value
ALT/AST ratio ⩽1 and GAL-3 ⩽14.4	Ref.		Ref.
ALT/AST ratio ⩽1 and GAL-3 >14.4	2.29 (1.30–4.04)	0.004	1.27 (0.67–2.40)	0.457
ALT/AST ratio >1 and GAL-3 ⩽14.4	3.94 (2.33–6.64)	<0.001	2.63 (1.48–4.64)	0.001
ALT/AST ratio >1 and GAL-3 >14.4	7.17 (4.29–11.96)	<0.001	3.37 (1.90–5.99)	<0.001

Adjusted: The model was adjusted for sex, age, WHR, uric acid, TG, HDL, fasting sugar, PLR, Apo-B, and lipoprotein(a).

Figure 2.

Boxplot depicting the ALT/AST ratio within GAL-3’s IQR.

The relationships between cardiometabolic risk factors, WHR, and GAL-3 level

We also examined differences in WHR among the GAL-3 quartile groups. The participants with a higher WHR had a higher GAL-3 level than those with a WHR <0.5 (Supplemental Figure S2), and there were differences in the WHR among the GAL-3 quartile groups (Figure 3). The participants with a GAL-3 level between 10.7 and 17 ng/ml seemed to have a higher cardiometabolic risk than those with a lower level; however, the difference tended to disappear if the GAL-3 level was >17.0 ng/ml (Supplemental Figure S3).

Figure 3.

A box plot is shown below representing waist-to-height ratios across different levels of GAL-3.

Development of a predictive nomogram

Considering the prognostic signiﬁcance of GAL-3, we sought to combine it with seven common clinical factors (age, sex, ALT/AST ratio, WHR, PLR, uric acid, and TGs) to better predict the presence of moderate-to-severe hepatosteatosis (Supplemental Figure S4).

Discussion

The present retrospective study with secondary biomarker analysis demonstrated that GAL-3 level and comprehensive cardiometabolic index were associated with significant fatty liver disease, which was prevalent among those who were younger, overweight, and hypertensive. Despite potential confounders such as ALT/AST ratio, WHR, MetS, dyslipidemia, and inflammatory markers, GAL-3 remained consistently associated with moderate-to-severe hepatosteatosis regardless of alcohol consumption.

Hepatosteatosis and cardiometabolic burden

Our findings showed strong associations between cardiometabolic burden, including GAL-3, uric acid, components of MetS, WHR, and apo-B, with the severity of hepatosteatosis, compatible with previous studies.^16,17 In addition, the ALT/AST ratio reflects hepatic dysfunction or inflammation, and it might be a predictive marker for hepatosteatosis in our study.¹⁸ PLR and IL-6 are also inflammatory markers associated with anthropometric indices, metabolic factors,¹⁹ hepatosteatosis,^20,21 and hepatic fibrosis,^20,22 which also found lower lipoprotein(a) in those populations.²³ Regarding alcoholic effects, the patients with NAFLD presented with similar features of cardiometabolic risks since GAL-3 still predicted high-grade hepatosteatosis in the final analysis. Therefore, we generated a nomogram including age, sex, ALT/AST ratio, WHR, PLR, uric acid, and TGs to predict the presence of fatty liver in patients attending community-based checkups (Supplemental Figure S4).

GAL-3 and hepatosteatosis

Previous studies on the association between GAL-3 and liver disease have been inconsistent. A high GAL-3 level has been reported to be a marker of hepatosteatosis,²⁴ hepatic fibrosis, and therapeutic response²⁵; however, Maxime et al.¹⁴ reported that circulating GAL-3 was not correlated with NAFLD. In addition, GAL-3 has also been reported to contribute to inflammation, cell proliferation, differentiation, apoptosis, fibrosis, and host defense in chronic liver disease.^6–8 Moreover, GAL-3 may play a critical role in mediating hepatoprotection and M2-like macrophages by inhibiting pyroptosis,¹³ while an obesity-driven increase in steatosis was uncoupled with attenuated fibrotic nonalcoholic steatohepatitis in GAL-3-deficient mice.⁹ After adjusting for multiple cardiometabolic risk factors and inflammatory biomarkers, our results showed that GAL-3 was significantly correlated with hepatosteatosis. This finding is compatible with a human study that reported that the number of GAL-3-positive cells in the liver was correlated with both the severity of biopsy-proven hepatosteatosis and liver damage.¹⁰ Another animal study also observed that a chronic high-fat diet led to the up-regulation of GAL-3 and Toll-like receptor 4, subsequently activating NLRP3 inflammasomes.²⁶ In view of this, we propose that further studies are warranted to investigate a causal relationship between GAL-3 and hepatosteatosis.

Cardiometabolic index and GAL-3

Our results showed that WHR, MetS, ALT/AST ratio, as well as GAL-3, were predictive markers for high-grade hepatosteatosis, which is in line with previous studies performed on this topic.²⁷ As a result, traditionally used indices fail to account for the paradox between fatty liver and early fibrosis.^28,29 The participants with higher ALT/AST ratio and WHR tended to have a higher GAL-3 level, which was significantly linearly correlated with both indices. Despite a positive correlation between GAL-3 binding protein and MetS in adults,³⁰ we found that the proportion of participants with >3 MetS components was not higher in those with a GAL-3 level >17 ng/ml. Nayor et al.²⁷ did not find a correlation between GAL-3 with cardiometabolic diseases after multivariable adjustments, and implied modulation of the GAL-3 pathway in high-grade MetS.

There was bias in this cross-sectional study as the participants were not randomly selected but rather chosen based on their personal willingness to undergo serum collection. This limitation reduces the generalizability of the findings which may not be applicable to the general population. An investigation of secondary biomarkers based on a community-dwelling cohort cannot provide long-term observations or conclude definite relationships between the level of GAL-3 and the progression of hepatosteatosis. In addition, obtaining details of a person’s medical history (co-morbidities including coronary artery disease) and over-the-counter medications using a questionnaire is insufficient. It was impossible to ignore the effects of anti-lipid treatment on measurements. Variations in ultrasound examination findings and a lack of repetitive studies were other limitations. Despite the same examination machine, samples from different years would result in variation.

Conclusion

Our study found that GAL-3 was significantly correlated with severe hepatosteatosis in addition to cardiometabolic risks and anthropometric indices. A linear relationship was observed between GAL-3 and ALT/AST ratio as well as WHR, which indicated that an inflammatory cascade and central obesity contribute to fatty liver. Further, longitudinal studies are needed to examine this relationship on a larger scale.

Supplemental Material

sj-docx-1-taj-10.1177_20406223241302719 – Supplemental material for Association between galectin-3 and hepatosteatosis in a community-based cross-sectional study

Supplemental material, sj-docx-1-taj-10.1177_20406223241302719 for Association between galectin-3 and hepatosteatosis in a community-based cross-sectional study by Ming-Shyan Lin, Ya-Chi Tu, Yu-Sheng Lin, Meng-Hung Lin, Chun-Liang Lin, Ming-Horng Tsai, Yung-Yu Hsieh, Tien-Hsing Chen, Mei-Yen Chen and Chung-Sheng Shi in Therapeutic Advances in Chronic Disease

Footnotes

Appendix

Acknowledgements

This study is based on data from Biobank, CGMH, Chiayi Branch. The authors thank Health Information and Epidemiology Laboratory, Chang Gung Memorial Hospital, Chiayi Branch for providing comments and assistance in data analysis. To obtain the laboratory equipment and to confirm the data, Miss Chia-Chien Lee (Department of Laboratory Medicine, Chiayi Chang Gung Memorial Hospital) assisted us.

Declarations

ORCID iD

Ming-Shyan Lin

Supplemental material

Supplemental material for this article is available online.

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