Improvement of Liver Function by a Short-term Administration of Luseogliflozin in Patients with Type 2 Diabetes: A Single-arm Study and the Mini-literature Review Volume 3 - Issue 1

Koh Yamashita¹* and Toru Aizawa¹

• ¹Diabetes center, Aizawa Hospital, Matsumoto, Japan

Received: March 15, 2021;   Published: March 23, 2021

*Corresponding author: Koh Yamashita, Diabetes Center, Aizawa Hospital, 2-5-1 Honjo, Matsumoto, Japan

DOI: 10.32474/CTGH.2021.03.000156

 

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Abstract

Background: Non-alcoholic fatty liver disease is not simply the hepatic manifestation of obesity and diabetes but also linked to hepatocellular carcinoma. Yet, its effective treatment has not been established. In this study, we evaluated the effect of a short-term administration of luseogliflozin to patients with type 2 diabetes having non-alcohol fatty liver disease. Luseogliflozin is a unique sodium-glucose cotransporter 2 inhibitor which is metabolized in and excreted by the liver in addition to the kidney. Therefore, the drug might possess an additional effect on other agents of the same class which are exclusively metabolized in the kidney.

Methods: Using alanine aminotransferase >20 IU/L as a diagnostic basis for non-alcoholic fatty liver disease, 19 patients, not taking alcohol, with type 2 diabetes (male/female 15/4, the median age 57 years) was treated with 2.5 mg luseogliflozin for 12 weeks.

Results: Pre- and post-treatment median values for alanine aminotransferase were 51 IU/L and 33 IU/L (p = 0.001), and the corresponding values for the fibrosis index based on the four factors [age (years) ∙ alanine aminotransferase (IU/L)] / [platelets (109/L) ∙ alanine aminotransferase (IU/L)1/2)] were 1.669 and 1.314 (p = 0.043). There was no adverse effect of the drug. Our findings were essentially compatible with the results of the previous studies reviewed.

Conclusion: We conclude that sodium-glucose cotransporter 2 inhibitor could be the choice for the pharmacological treatment of non-alcoholic fatty liver disease. Especially, a short-term administration of it is consistently effective in mild cases.

Keywords: SGLT2 inhibitor; NAFLD; Fibrosis-4 index; GPR-index; APRI.

Abbreviations: SGLT2i: sodium-glucose cotransporter 2 inhibitor; NAFLD: non-alcoholic fatty liver disease; NASH: non-alcoholic steatohepatitis; T2DM: type 2 diabetes mellitus; AST: aspartate aminotransferase; ALT: alanine aminotransferase; GGT: gammaglutamyl transpeptidase; Fib-4 index: Fibrosis-4 index; GPR-index: gamma-glutamyl transpeptidase to platelet ratio; APRI: aspartate aminotransferase to platelet ratio

Introduction

Obesity or overweight is the motherland of non-alcoholic fatty liver disease (NAFLD) and non-alcoholic steatohepatitis (NASH) [1]. Accordingly, with increasing trend of body weight worldwide, the number of patients with the liver problem is relentlessly increasing [2]. Recently, NASH has also been attracting the attention as a cause of hepatoma [3,4]. Under such yet, treatment of NAFLD (NASH and NAFLD are collectively called NAFLD hereafter in this communication), irrespective of presence or absence of diabetes, has not been established. Results of treatment of patients with type 2 diabetes (T2DM) having NAFLD with sodium-glucose cotransporter- 2 inhibitor (SGLT2i) appears promising [3-7], the effectiveness of a short-term treatment, such as 12 week-treatment, has not been established.
Here, we evaluated effectiveness of a short-term administration of SGLT2i, luseogliflozin, that is metabolized not only in the kidney but in the liver [8]. A mini literature review on this issue was also performed to resolve the current inconsistency. This study was approved by the Clinical Research Ethics Committee of Aizawa Hospital (No. 2019-094).

Subjects and Methods

Subjects

Consecutive 29 patients with T2DM who took luseogliflozin for 3 months or longer between January 1, 2019 to May 31, 2020 were initially registered. Because the purpose of this study was to investigate the effect of luseogliflozin on NAFLD/NASH, 8 with alanine aminotransferase (ALT) less than 20 IU/L [9], and other 2 with a habitual alcohol drinking of 20 g/day or more were excluded, and the remaining 19 were analyzed.
The study was a single-arm, add-on study. Namely, 2.5 mg luseogliflozin was additively prescribed on top of the hypoglycemic agents already taken by the patients, which are shown in Supplemental Table 1. The data before and 12 weeks after luseogliflozin administration was critically compared.

Laboratory measurements

In addition to the routine clinical chemistries, indices of the hepatic fibrosis including Fibrosis-4 index (Fib-4 index), gammaglutamyl trans peptidase (GGT) to platelet ratio (GPR-index), and aspartate aminotransferase (AST) to platelet ratio (APRI) were calculated10: the unit for AST, ALT, GGT as IU/L, platelet counts as 109/L and age as a year. Equations for each index were as follows [10].

Fib-4 = [(AST) ∙ (age)] / [(Platelet counts) ∙ (ALT)1/2]
GPR index = 100 ∙ (GGT) / (Platelet counts)
APRI = 100 ∙ (AST) / (Platelet counts)

Statistical analysis

The data were collected retrospectively and analyzed cross-sectionally and longitudinally. We evaluated the effect of luseogliflozin on the liver function tests and the indices of liver fibrosis. In addition, delta, i.e., the basal value minus 12 week-value for the indices of liver fibrosis was calculated for each study subject, and correlation between the delta values of fibrosis indices and the basal plasma glucose (PG), glycosylated hemoglobin (HbA1c), AST, ALT, GGT, body weight (BW) and body mass index (BMI) were examined. Furthermore, the delta value of the liver fibrosis indices and the delta value of PG, HbA1c, AST, ALT, GGT, BW and BMI were also examined. The statistical analysis was performed using JMP ver.15. Wilcoxon rank-sum test, Wilcoxon signed rank test and Spearman rank correlation were used as needed.

Literaturereview

Representative 10 original reports published in the English language on the treatment of patients with T2DM having NAFLD by SGLT2 inhibitors [6,7,11-18] were summarized to provide a current overview of the issue. In these literature, five kinds of SGLT2i agents were prescribed, with the number of the patients ranging from 9 to 32 and the treatment duration from 12 to 48 weeks.

Results

Baseline characteristics of the patients

The study patients were male dominant (the proportion of males, 79%), middle-aged Japanese adults with the median BMI of 28.0 kg/m2 which was larger than the representative value in the Japanese patients with T2DM in general11(Table 1A). The median HbA1c value of the entire group before luseogliflozin was 8.8% (77 mmol/mol) so that the level of glycemic control was unsatisfactory (Table 1A). Regarding the hypoglycemic agents used before subscribing luseogliflozin, Dipeptidyl Peptidase-4 (DPP-4) inhibitors and biguanide were most frequently employed (Supplemental Table 1), which was typical for the Japanese patients [19].

Liver function and indices of hepatic fibrosis following luseogliflozin administration

Elevated serum level of ALT was an inclusion criterion, so that the ALT was clearly elevated as a group with the median value, 51 IU/L. As well expected, administration of luseogliflozin significantly decreased PG and HbA1c (Table 1, A and B, before and after luseogliflozin, respectively). In addition, it significantly lowered the serum level of AST, ALT, GGT, and alkaline phosphatase (ALP). The degree of lowering was 12%, 34%, 35 and 42% for the respective enzyme levels. Importantly, the luseogliflozin treatment also significantly lowered the values for Fib-4 index, GPR index, and APRI (Figure 1).

Correlation between delta Fib-4, GPR index, and APRI and baseline and delta values of liver function and the body weight and BMI

The delta Fib-4 index was significantly and positively correlated associated with higher baseline AST and ALT levels; the delta GPR index was correlated with baseline AST and GGT; the greater delta APRI was associated with higher baseline AST and ALT (Table 2A). Correlation between the delta values and the baseline of liver function was absent for BW and BMI (Table 2A).
On the other hand, there was an inverse correlation between ‘delta Fib-4 and delta AST and delta ALT’, ‘delta GPR index and delta GGT’ and ‘delta APRI with delta AST and delta ALT’ (Table 2B). There was no significant correlation between delta values of the fibrosis indices and the delta of BW and BMI (Table 2B).

Literature review

In the previous studies, SGLT2i was administered for the relatively small number of patients with type 2 diabetes having NAFLD (up to 32) for the relatively short period (up to 48 weeks) for patients with T2DM having NAFLD (Table 3). In general, the agent effectively ameliorated the hepatic fat accumulation as indexed by the liver function tests, the fibrosis indices, the morphological tests such as computed tomography (CT) scan, magnetic resonance imaging (MRI) or biopsy. However, the detailed analysis of the reported data of the short-term therapy exhibited inconsistency. According to the report by Eriksson JW et al [7], in one population with the treatment duration of 12 weeks, liver function was improved and fat accumulation in the liver decreased, and in the other, the hepatic fat was not decreased by the 12 weektreatment with SGLT2i [7]. Morphological evaluation of the liver was not carried out in the third study [14]. Taken together, twentyfour weeks was the shortest period needed to firmly demonstrate improvement of hepatic morphology indicating attenuation of fat accumulation [12,17]. No clear-cut difference on the basis of species of SGLT2i was observed.

Discussion

In this study, we analyzed effect of 2.5 mg luseogliflozin given for 3 months to patients with T2DM having NAFLD, judged by ALT 20 IU/L or higher. We confirmed the substantial lowering, generally 30-40%, of elevated liver enzyme levels and, moreover, decrease in the established indices of liver fibrosis such as Fib-4 index, GRP index, and APRI, by this short-term SGLT2i treatment in the group. Elevated delta Fib-4 was significantly associated with higher basal Fib-4 values, and as expected from the definition of Fib-4, delta Fib-4 and delta AST well correlated each other. The degree of improvement of the indices of hepatic fibrosis was much less than that of glycemia, and our preliminary data suggested that lowering of delta Fib-4 correlated with improvement of insulin sensitivity indexed by lipids and BMI [20] (data not shown). Absence of correlation between the drug effect on the indices of fatty liver and its effect on the BW strongly suggested that BW reduction was not the primary conveyer of SGLT2i’s favorable effect on NAFLD, at least under our treatment protocol. Importantly, the average change of the three fibrosis indices corresponded to the range observed in patients whose alteration of the hepatic fibrosis proven by biopsy or ultrasonography [10]. A significant lowering of Fib-4 after treatment with SGLT2i was not recognized in some of the previous studies (Table 3). A clear-cut luseogliflozin effect within a short period on the liver in our study might be due to the stringent selection of study participants using ALT ≥ 20 IU/L as an entry criterion. The mini review can be summarized as, 1) favorable outcome of SGLT2i treatment on NAFLD may be a class effect, 2) the hepatic enzymes may be relatively sensitive as indicators of improved NAFLD showing significant attenuation within 12 weeks, and 3) for measurable reduction of hepatic fat, approximately 10 more weeks of luseogliflozin treatment are needed. Hepatic triglycerides (TG) accumulation might be excessively stimulated by an abundance of substrate, hyperglycemia, and hyperinsulinemia in T2DM patients with NAFLD [21], and SGLT2i might suppress this circle by lowering PG and serum insulin at the same time through improved insulin sensitivity [22,23]. Results of randomized, largescale, prospective studies with measurements of insulin and newer markers are strongly awaited to fully understand the significance of SGLT2i in NAFLD or NASH.

Conclusion

Short-term (twelve-week) add-on administration of luseogliflozin lowered plasma glucose in patients with type 2 diabetes having NAFLD. In addition, the treatment effectively suppressed markers of fatty liver likely through improved insulin sensitivity. Through the literature review, luseogliflozin’s effect on fatty liver appears to be comparable to other SGLT2i.

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