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Differences in lipid metabolism between anagliptin and sitagliptin in patients with type 2 diabetes on statin therapy: a secondary analysis of the REASON trial
Cardiovascular Diabetology volume 18, Article number: 158 (2019)
Anagliptin, a dipeptidyl peptidase-4 inhibitor, is reported to reduce the level of low-density lipoprotein cholesterol (LDL-C). The underlying mechanism of this effect and effect on lipid metabolism however remains uncertain.
Aim and methods
We therefore evaluate the effects of anagliptin on lipid metabolism-related markers compared with those of sitagliptin. The study was a secondary analysis using data obtained from the Randomized Evaluation of Anagliptin versus Sitagliptin On low-density lipoproteiN cholesterol in diabetes (REASON) trial. This trial in patients with type 2 diabetes at a high risk of cardiovascular events and on statin therapy showed that anagliptin reduced LDL-C levels to a greater extent than sitagliptin. Cholesterol absorption (campesterol and sitosterol) and synthesis (lathosterol) markers were measured at baseline and 52 weeks in the study cohort (n = 353).
There was no significant difference in the changes of campesterol or sitosterol between the two treatment groups (p = 0.85 and 0.55, respectively). Lathosterol concentration was increased significantly at 52 weeks with sitagliptin treatment (baseline, 1.2 ± 0.7 μg/mL vs. 52 weeks, 1.4 ± 1.0 μg/mL, p = 0.02), whereas it did not change in the anagliptin group (baseline, 1.3 ± 0.8 μg/mL vs. 52 weeks, 1.3 ± 0.7 μg/mL, p = 0.99). The difference in absolute change between the two groups showed a borderline significance (p = 0.06).
These findings suggest that anagliptin reduces LDL-C level by suppressing excess cholesterol synthesis, even in combination with statin therapy.
Trial registration ClinicalTrials.gov number NCT02330406. https://clinicaltrials.gov/ct2/show/NCT02330406; registered January 5, 2015.
Strict management of lipid profiles is a clinically critical issue to prevent development and recurrence of cardiovascular events especially in high risk patients, such as those with diabetes . The Randomized Evaluation of Anagliptin versus Sitagliptin On low-density lipoproteiN cholesterol in diabetes (REASON) trial in patients with type 2 diabetes (T2D) at high risk of cardiovascular events and a serum low-density lipoprotein cholesterol (LDL-C) level > 100 mg/dL under statin treatment demonstrated that 52 weeks of anagliptin treatment was associated with a greater reduction in serum LDL-C levels compared to those observed with sitagliptin . The estimated treatment difference between the two groups was − 4.52 mg/dL (95% confidential interval − 8.02 to − 1.02). This finding suggests that anagliptin treatment is clinically useful for further reducing LDL-C in T2D patients who require aggressive LDL-C-lowering treatment.
Although several previous studies have also reported similar effects for anagliptin [3, 4], the underlying mechanisms of its LDL-C-lowering effect and influence on lipid and other metabolisms have yet to be fully understood. Furthermore, little is known regarding differences from other types of dipeptidyl peptidase-4 (DPP-4) inhibitors. To better understand the clinical effects of anagliptin, we performed a secondary analysis using data obtained from the REASON trial.
It is well known that statin therapy can alter markers of LDL-C lowering [5, 6]. Regarding the effect of anagliptin on those markers, only the single-arm pilot study of Aoki et al.  reported that 4 weeks of anagliptin therapy decreased the cholesterol synthesis marker, lathosterol, without changing cholesterol absorption markers. In the current analysis we also attempted to investigate the effects of anagliptin, compared to sitagliptin, on these markers to explore the possible mechanisms of anagliptin-mediated LDL-C lowering seen in the REASON trial. This trial also examined differences in the effects of anagliptin and sitagliptin on several metabolic markers, including those involved in lipid metabolism.
Trial design and patients
The detailed design of the REASON trial has been published elsewhere . Briefly, the trial was a multicenter, randomized, open-label, parallel-group design that assessed the effect of anagliptin (100 mg, twice daily), relative to sitagliptin (50 mg once daily), on reduction in LDL-C in adult patients with T2D at high risk of cardiovascular events and whose LDL-C levels were > 100 mg/dL despite treatment with a statin. Eligible patients had any one of previously documented atherosclerotic lesions in the coronary, intracranial, carotid, or other peripheral arteries. Randomization was performed centrally through a web-based system using a stochastic minimization algorithm balanced for hospitals, HbA1c (≥ 8.0%, < 8.0%), use of DPP-4 inhibitors prior to randomization, sex, body mass index (≥ 25 kg/m2, < 25 kg/m2), and LDL-C (≥ 130 mg/dL, < 130 mg/dL). The trial was conducted in accordance with the Declaration of Helsinki and the Ethical Guidelines for Medical and Health Research Involving Human Subjects in Japan. The institutional review boards at the University of the Ryukyus and each participating center approved the trial. All enrolled patients provided written informed consent prior to randomization. The trial was registered on Clinicaltrials.gov (NCT02330406).
The clinical characteristics of the study cohort (n = 353; anagliptin 177, sitagliptin 176) were evaluated at baseline. The following laboratory parameters were also obtained at baseline and 52 weeks, with the analyses carried out at a core laboratory (SRL Inc., Tokyo, Japan); LDL-C measured by the direct method, total cholesterol, high-density lipoprotein cholesterol, triglyceride, campesterol, sitosterol, lathosterol, high-molecular weight adiponectin, and FIB-4 index calculated as age × aspartate aminotransferase (U/L)/[platelet (109/L) × alanine aminotransferase1/2 (U/L)] . In addition, the stored serum samples obtained from a randomly selected cohort in the REASON trial (n = 100; anagliptin 50, sitagliptin 50) were used to measure remnant-like particle cholesterol (RLP-C), malondialdehyde-modified low-density lipoprotein (MDA-LDL), and lipoprotein (a). The analyses were carried out at a core laboratory (LSI Medience Corp., Tokyo, Japan).
The analyses were performed on the full analysis set, which included participants who received an allocated treatment, provided assessable outcome data, and were managed under the intention-to-treat principle. Categorical variables were expressed as frequencies with percentages, and continuous variables as means with standard deviation. We compared the changes from baseline to 52 weeks in the groups using the paired t-test and differences in changes between the two treatment groups using the two-sample t-test. All statistical analyses were performed at the data center (Institute for Clinical Effectiveness) by the study statisticians (Morimoto T and Sakuma M), using JMP 13.1 (SAS Institute Inc, Cary, NC) and SAS 9.4 (SAS Institute Inc, Cary, NC). All P values were two-sided, with P < 0.05 considered to be statistically significant.
Baseline characteristics of patients
The baseline clinical characteristics were comparable in the two treatment groups in both the study and randomly selected cohorts (Table 1). In the study cohort (n = 353 patients), the mean age was 68 years, 76% had hypertension, and 45% had a previous history of coronary artery disease. Of these patients, 79% had received a strong statin and 8% had received ezetimibe.
Changes in markers of cholesterol absorption and synthesis
Figure 1 shows the changes in the markers of cholesterol absorption (campesterol and sitosterol) and synthesis (lathosterol) from baseline to 52 weeks. Campesterol levels increased in both treatment groups, with no significant difference in the absolute changes between the two groups (Fig. 1a, b). Similarly, there was no significant change in sitosterol levels and no group different in the absolute changes (Fig. 1c, d). On the other hand, lathosterol increased significantly in the sitagliptin groups, while there was no change in the anagliptin groups (Fig. 1e). The difference in absolute change between the groups showed borderline significant (Fig. 1f). In patients who had not received ezetimibe therapy at baseline (Additional file 1), the trend of changes in these markers was also similar to those observed in the original overall cohort (Fig. 1).
Changes in metabolic markers
Table 2 shows the changes in the other laboratory outcomes measured at baseline and 52 weeks. After treatment with anagliptin or sitagliptin, high-molecular weight adiponectin levels increased significantly in the anagliptin groups, while there was no significant change in the sitagliptin groups. The FIB-4 index increased significantly in the sitagliptin group, whereas there was no obvious change in the anagliptin group. The absolute changes in these variables did not differ between the two treatment groups. In addition, in the randomly selected patients no significant changes or group differences were observed in lipoprotein (a), RLP-C, and MDA-LDL concentrations.
Recent global clinical guidelines recommend more intensive lipid management in patients with a high cardiovascular risk, such as those with a history of coronary artery disease or T2D . A previous meta-analysis showed clearly that a 1 mmol/L reduction in LDL-C level was associated with a 9% decrease in mortality in patients with diabetes . There is also evidence that treatment with ezetimibe added to a statin is more effective for improving cardiovascular outcomes in patients with acute coronary syndrome and diabetes than those without diabetes . These findings indicate that additive reduction in LDL-C levels with non-statin medications has a large impact on cardiovascular prognosis, especially in patients with diabetes at a high cardiovascular risk.
The class of DPP-4 inhibitors is known to be potentially associated with a beneficial effect on cholesterol levels [13, 14]. Several clinical trials have also shown that anagliptin consistently decreased serum cholesterol levels, including LDL-C, [4, 15, 16]. The LDL-C-lowering effect of anagliptin at 24 weeks was comparable to that of alogliptin, although the anagliptin-mediated reduction in LDL-C level was associated with suppression of apolipoprotein B-100 synthesis in patients with T2D . On the other hand, sitagliptin is also known to decrease serum cholesterol levels in patients with T2D [17,18,19]. Masuda et al.  found that 12 weeks of sitagliptin treatment improved lipid profiles accompanied by reductions in several atherogenic remnant lipoproteins. Kutoh et al.  also reported that sitagliptin down-regulated high free fatty acid (FFA) levels and reduced atherogenic cholesterol levels. Furthermore, in experimental T2D model rats sitagliptin ameliorated left ventricular diastolic dysfunction by shifting FFA towards glucose utilization in cardiomyocytes in conjunction with a reduction in lipolysis. In T2D patients without a history of atherosclerotic diseases another DPP-4 inhibitor, vildagliptin, decreased LDL-C, although there was no significant difference in changes in LDL-C between the vildagliptin and metformin groups . Therefore, DPP-4 inhibitors are likely to have a unique effect of reducing LDL-C levels associated with beneficial impacts on lipid profiles. Nevertheless, a meta-analysis of randomized clinical trials showed no significant difference in the changes of LDL-C levels between sitagliptin (alone or in combination) and controls . Furthermore, little is known about intra-class differences in the LDL-C-lowering effect and the mechanisms by which DPP-4 inhibitors influence lipid metabolism in T2D patients even under statin treatment.
To date, no head-to-head clinical study to compare these changes between anagliptin and sitagliptin has been reported, with the strength of the REASON trial being that it was the first study designed specifically to investigate these endpoints between anagliptin and sitagliptin in a clinical setting . Regarding a possible mechanism for this effect, a pilot clinical study in drug-naïve patients with T2D by Aoki et al.  showed that anagliptin (without a comparator) decreased serum levels of lathosterol without affecting cholesterol absorption markers, such as campesterol. In the present study where all participants had been receiving background medications for dyslipidemia, the serum level of lathosterol did not change during the 52 weeks of anagliptin treatment, whereas it increased significantly during treatment with sitagliptin. Schonewille et al.  have reported previously a statin-induced increase in hepatic cholesterol synthesis in mice, that may partly account for our findings. It is also known that chronic statin administration generally leads to a compensatory increase in intestinal cholesterol absorption . Increases in the serum level of campesterol observed in both treatment groups may therefore indicate that there was no obvious effect of both DPP-4 inhibitors on the cholesterol absorption pathway. Therefore, the changes we observed in markers of lipid metabolisms may be, in part, affected by background statin treatment, with our findings suggesting that anagliptin treatment could at least attenuate excess hepatic cholesterol synthesis compared to that induced by sitagliptin.
A recent experimental study in LDL receptor-deficient mice demonstrated anagliptin down-regulated sterol regulatory element-binding protein-2, a transcriptional factor related to hepatic lipid synthesis . In our study, in addition to attenuating a cholesterol synthesis marker, we found a significant increase in serum adiponectin levels in the anagliptin group, but not in the sitagliptin group. The FIB-4 index, a marker of hepatic fibrosis, also did not change in the anagliptin group, whereas it increased significantly in the sitagliptin group. Lower levels of adipokines, including adiponectin, are known to be associated in the pathophysiology of obesity-related liver diseases . Taken together, these findings suggest that anagliptin exerts a hepato-protective effect beyond its glycemic-lowering action.
Anagliptin is known to have the same glycemic efficacy and safety as sitagliptin as add-on therapy in patients with T2D . A similar result was obtained in the REASON trial even in T2D patients at high cardiovascular risk who were on statin therapy . Therefore, given the additional LDL-C-lowering effect and possible hepato-protective action of anagliptin, the agent may have beneficial effects on lipid metabolism and may have clinical advantages when choosing a glucose-lowering agent in T2D patients who require further treatment to achieve the lipid levels necessary to reduce cardiovascular risk. However, because we observed no significant changes or group differences in other atherogenic lipid parameters, such as lipoprotein (a), RLP-C, and MDA-LDL, in our randomly selected samples, further long-term studies are required to examine whether anagliptin has favorable effects on atherosclerosis and incident cardiovascular events in the observation.
First, because this study was a sub-analysis of the REASON trial it has the same limitations as the original trial . Therefore, the sample size was estimated for the primary and important secondary endpoints of the REASON trial, and the sample size of this sub-analysis might not be sufficiently large to detect clinically meaningful differences in the measurements. Second, no follow-up data on lipid metabolism markers were available during the study period (e.g., 12, 24, and 36 weeks). Our analyses also did not include any data on changes in the full lipoprotein profiles. Third, the statins administered to subjects were not matched between the two groups and this may have influenced our findings. Furthermore, changes in the markers of cholesterol synthesis and absorption are known to vary according to statin dose [26, 27]. However, we have no information on the doses of statins administered to the subjects, although the prevalence of strong statins did not differ between the sitagliptin and anagliptin groups. Fourth, we have no information on the degree of and change in non-pharmacological therapy such as diet and exercise during the study period. However, the effects of imbalance of these factors should be small because this study was originally randomized clinical trial. Finally, because the participants in the REASON trial were all Asian people, it remains uncertain whether or not our findings can be extrapolated to other ethnicities.
Our findings suggest that anagliptin reduces LDL-C levels by suppressing excess cholesterol synthesis in patients with T2D even in combination with statin therapy. However, further research is needed to assess whether anagliptin specifically affects lipid metabolisms and to examine its profound mechanisms in greater detail.
Availability of data and materials
The datasets analyzed during the current study are available from the corresponding author on reasonable request (firstname.lastname@example.org).
free fatty acid
low-density lipoprotein cholesterol
malondialdehyde-modified low-density lipoprotein
remnant-like particle cholesterol
type 2 diabetes
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The authors thank all the staff at the data center (Institute for Clinical Effectiveness) for their kind assistance. This study was supported by Kowa Company, Ltd. and partly by Taiju Life Social Welfare Foundation.
This trial was funded by Kowa Company, Ltd.
Ethics approval and consent to participate
The ethical committees of the participating institutions approved the study protocol. Written informed consent for participation in the study was obtained from all the subjects.
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All authors have read and approved the submission of the manuscript. The manuscript has not been published and is not being considered for publication elsewhere, in whole or in part, in any language. If the manuscript is accepted, we approve it for publication in Cardiovascular Diabetology.
AC. declares no potential conflict of interest. A.T. has received modest honoraria from Astellas, AstraZeneca, Boehringer Ingelheim, Daiichi Sankyo, Kowa, MSD, Mitsubishi Tanabe, Novo Nordisk, Taisho Toyama, and Takeda. T.M. has received lecturer’s fees from Daiichi Sankyo, Japan Lifeline, Kyocera, and Novartis; manuscript fee from Pfizer. M.Sa. has received advisory board for Enomoto Pharmaceutical. M.Sh. reports research grants from AstraZeneca, and Ono; non-purpose research grants from Astellas, AstraZeneca, Bayer, Boehringer Ingelheim, Chugai, Eli Lilly, Kowa, Mitsubishi Tanabe, MSD, Novo Nordisk, Ono, Taisho Toyama, and Takeda; lecturer’s fees from Astellas, AstraZeneca, Bayer, Boehringer Ingelheim, Chugai, Eli Lilly, Kowa, Mitsubishi Tanabe, Mochida, MSD, Novo Nordisk, Ono, Taisho Toyama, and Takeda; advisory board for Novo Nordisk; sponsored office from Boehringer Ingelheim. T.N. has received research grants from Eli Lilly; lecturer’s fees from Boehringer Ingelheim, Eli Lilly, MSD, and Sumitomo Dainippon. O.A. has received lecturer’s fees from Abbott, Astellas, Boehringer Ingelheim, Medtronic, and St. Jude Medical. S.U. has received research grants from Bristol-Myers Squibb, and Kowa; non-purpose research grants from Bristol-Myers Squibb, Chugai, MSD, Pfizer, and Takeda; lecturer’s fees from Boehringer Ingelheim, and MSD. K.N. has received research grants from Actelion, Asahi Kasei, Astellas, Astellas Amgen Bio Pharma, Boehringer Ingelheim, GlaxoSmithKline, Mitsubishi Tanabe, Novo Nordisk, Teijin, and Terumo; non-purpose research grants from Astellas, Bayer, Boehringer Ingelheim, Daiichi Sankyo, Eli Lilly, Mitsubishi Tanabe, MSD, Novartis, Novo Nordisk, Ono, Otsuka, Pfizer, Sanofi, and Teijin; lecturer’s fees from Actelion, Astellas, AstraZeneca, Bayer, Boehringer Ingelheim, Daiichi Sankyo, Edwards Lifesciences, Eli Lilly, FUJIFILM, Fukuda Denshi, Kowa, Kyowa Hakko Kirin, Medtronic, Mitsubishi Tanabe, MSD, Novartis, Ono, Otsuka, Pfizer, Roche Diagnostics, Sanofi, Sanwa Kagaku Kenkyusho, Taisho Toyama, Takeda, and Teijin; manuscript fees from Astellas, and Takeda; advisory boards for AstraZeneca, Boehringer Ingelheim, Eli Lilly, and Novo Nordisk.
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Changes in the lipid metabolism markers in patients who had not received ezetimibe at baseline. Comparison of (A) campesterol, (C) sitosterol, (E) lathosterol at 0 and 52 weeks and absolute change of (B) campesterol, (D) sitosterol, (F) lathosterol at 52 weeks.
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Chihara, A., Tanaka, A., Morimoto, T. et al. Differences in lipid metabolism between anagliptin and sitagliptin in patients with type 2 diabetes on statin therapy: a secondary analysis of the REASON trial. Cardiovasc Diabetol 18, 158 (2019). https://doi.org/10.1186/s12933-019-0965-3
- Type 2 diabetes
- Lipid metabolisms