, Volume 48, Issue 9, pp 1919–1924 | Cite as

Effects of S21403 (mitiglinide) on postprandial generation of oxidative stress and inflammation in type 2 diabetic patients

  • R. Assaloni
  • R. Da Ros
  • L. Quagliaro
  • L. Piconi
  • A. Maier
  • G. Zuodar
  • E. Motz
  • A. Ceriello



Evidence suggests that postprandial hyperglycaemia may be a cardiovascular risk factor in diabetes. Oxidative stress and inflammation are involved in the pathogenesis of diabetic complications and previous studies have shown increased oxidative stress and inflammation in the postprandial phase in diabetic patients. The aim of the present study was to evaluate whether controlling postprandial hyperglycaemia with S21403 (mitiglinide) is accompanied by a reduced generation of oxidative stress and inflammation.

Subjects and methods

Forty type 2 diabetic patients participated in the study. Two different breakfast-tests were performed in each patient, with placebo or S21403. Plasma nitrotyrosine, plasma malondialdehyde (MDA), oxidised LDL (oxLDL), plasma total radical-trapping antioxidant parameter (TRAP), IL-6, IL-18, TNF-α, plasma glucose and insulin were measured.


After the administration of S21403, 40 mg, a rapid stimulation of insulin secretion was observed, accompanied by a reduction of postprandial hyperglycaemia. With S21403, a significant decrease of either nitrotyrosine, MDA and oxLDL levels, and a preservation of plasma TRAP compared with placebo was found. Significant decreases of IL-6, IL-18 and TNF-α were also observed with S21403 compared with placebo.


This study shows that controlling postprandial hyperglycaemia with S21403 significantly improves the cluster of oxidative stress and inflammation markers that are increased in the postprandial state in diabetic patients.


Inflammation Mitiglinide Oxidative stress Postprandial hyperglycaemia 



Cardiovascular disease




Oxidised LDL


Total radical-trapping antioxidant parameter


Patients with diabetes have an increased risk of cardiovascular morbidity and mortality [1]. In recent years much attention has been paid to the causal relationship between the postprandial state and atherogenesis [2, 3], even in diabetes mellitus [4, 5], and it has been suggested that postprandial hyperglycaemia may be an independent risk factor for cardiovascular disease (CVD) [6, 7].

There is growing evidence that oxidative stress, i.e. the imbalance between free-radical production and antioxidant defence [8, 9], and inflammation [10] are involved in the pathogenesis of CVD in diabetes mellitus. Postprandial generation of both oxidative stress [11, 12, 13] and inflammation [13, 14, 15] has been demonstrated in type 2 diabetic patients. However, it is still unclear whether this phenomenon can be controlled in clinical practice by modulating postprandial hyperglycaemia.

In this study, the effect of an oral compound, S21403 (mitiglinide), a rapid and short-acting insulin secretagogue that reduces postprandial hyperglycaemia [16], on postprandial generation of oxidative stress and inflammation was studied.

Plasma nitrotyrosine, malondialdehyde (MDA), oxidised LDL (oxLDL) and total radical-trapping antioxidant parameter (TRAP) were measured as markers of oxidative stress; IL-6, IL-18 and TNF-α were evaluated as inflammatory markers.

Subjects and methods


Men and women with type 2 diabetes according to WHO criteria, between 35 and 72 years of age, with a BMI between 22 and 35 kg/m2 and currently being treated by diet alone and having an HbA1c above 6.5%, or being treated by hypoglycaemic agents except insulin sensitisers and having an HbA1c between 6 and 10%, were eligible to participate in the study. The following treatments were allowed if prescribed at stable dosage during the whole study: antihypertensive drugs including ACE inhibitors, lipid-lowering drugs and oestrogen therapy as in contraceptive pills or in hormone replacement therapy for postmenopausal women.

Inclusion criteria also included a fasting capillary blood glucose level between 7 and 14 mmol/l measured just before the first breakfast-test.

Major exclusion criteria were: type 1 diabetes or insulin treatment; and in type 2 diabetic patients treatment with an insulin sensitiser or with more than one antidiabetic drug, or with drugs that could interfere with glucose metabolism, or with antioxidant supplementation. Other chronic diseases known to affect glucose control were also exclusion criteria, as were uncontrolled macroangiopathy, evidence of hepatic or renal disease (transaminases more than three times the upper normal value, or a plasma creatinine level above 140 μmol/l, macroalbuminuria >300 mg/24 h), uncontrolled dyslipidaemia (triglycerides above 2.5 mmol/l), pregnancy and breastfeeding.

All patients gave their written informed consent to participate in the study and the study centre received local ethics committee approval. The study was conducted in accordance with the ethical principles stated in the Declaration of Helsinki, 1964, amended in Edinburgh in 2000.

Study plan

This was a phase II, double-blind, placebo-controlled, cross-over study. It was performed in 40 diabetic outpatients being monitored in the Department of Internal Medicine, University of Udine, Italy. The demographic data and other baseline characteristics of the patients are described in the Table 1. In the randomised population, 11 patients (27.5%) had a history of hypertension, and five (12.5%) had a history of hyperlipidaemia.
Table 1

Baseline characteristics of the patients

Age (years)




BMI (kg/m2)


Weight (kg)


Duration of diabetes (months)


HbA1c (%)


Fasting blood glucose (mmol/l)


Systolic BP (mmHg)


Diastolic BP (mmHg)


Total cholesterol (mmol/l)


Triglycerides (mmol/l)


HDL (mmol/l)


LDL (mmol/l)


Data are means±SD

After a 7-day run-in placebo period, if eligible, each patient was randomly assigned to undergo two standardised breakfast-tests performed 2 days apart. The two sequences of treatment were randomly assigned at the first breakfast-test.

The 2-h breakfast-tests were performed at the hospital under the same conditions.

During the 7-day run-in period, as well as during the 2-day period between the two breakfast-tests, placebo was given three times a day immediately before meals.

The total duration of the study for each patient was 11 days.

The patients attended the Diabetes Unit at 07.00 hours after a 10-h fast (from 21.00 hours on the day before each breakfast-test). The fasting capillary blood glucose level was measured (with a glucose meter) immediately before the breakfast-tests.

The second breakfast-test was performed 2 days after if glycaemic control was relatively stable, i.e. if the difference in the fasting capillary blood glucose level between the two-breakfast-tests was ≤3 mmol/l.

If not, the patient had to come back within 10 days after and the investigator checked if it was possible to perform the breakfast-test on this other day.

A standardised breakfast that was designed to have negligible antioxidant content (600 kcal, 50% carbohydrate, 30% fat and 20% protein without significant amounts of vitamin C, α-tocopherol, carotenoids and flavonoids), was given at 08.00 hours. The composition of the breakfast was as follows: whole milk 125 ml, yoghurt 125 g, bread 90 g, butter 10 g and ham 60 g. The patient took the study-drug tablet immediately after the first blood sample and before the breakfast. The breakfast had to be eaten within 20 min. Time zero corresponds to the administration of the study drug. The patient was at rest, in a seated position, throughout the test. Plasma nitrotyrosine (main efficacy criterion), MDA, TRAP, plasma glucose, plasma insulin, oxLDL, IL-6, IL-18 and TNF-α were measured at 0 and 120 min.

Determination of sample size

For this exploratory study, the number of patients was estimated from the results of limited data obtained on the main efficacy criterion nitrotyrosine (Ceriello et al. [17 and unpublished data]).

Sample size was estimated on the change between time 0 and 120 min of nitrotyrosine during the meal-test for a difference of 0.1 μmol/l between placebo and S21403 using the two-sided Student’s t-test for paired samples at 5% type I error.

For a 0.12 μmol/l SD, 35 patients were necessary to detect at least 0.1 μmol/l difference between treatments with 95% power and at least 0.1 correlation coefficient ρ between measurements.

Taking into account the uncertainties of the estimation, it was decided to randomise 40 patients.


All the parameters were analysed in the laboratory of the centre.

Nitrotyrosine plasma concentration was assayed by ELISA [17] and expressed in µmol/L.

MDA was evaluated according to [18] and corrected to triglyceride and cholesterol concentration and expressed as µmol/L.

TRAP was evaluated as previously described [11]. Values are expressed as µmol/L.

We assessed oxLDL by the Mercodia Oxidized LDL ELISA (Mercodia AB, Uppsala, Sweden), according to the method described by Holvoet et al. [19], and expressed it in U/L.

IL-6, IL-18 and TNF-α plasma concentrations were assayed by commercially available ELISA kits (Bender MedSystems Diagnostics, Vienna, Austria), and expressed in pg/ml.

Insulin (Immuno Lite, Diagnostic Products Corporation, Los Angeles, CA, USA) was expressed as pmol/L.

Statistical analysis

The main efficacy criterion was the plasma nitrotyrosine level.

The secondary efficacy criteria were plasma levels of MDA, TRAP and oxLDL as oxidative stress markers and plasma concentrations of IL-6, IL-18 and TNF-α as inflammatory markers.

All these criteria were studied as changes from 0 to 120 min.

The main statistical analysis was performed with a type I error at 5% in order to evaluate the acute effect of S21403 40 mg compared with placebo on nitrotyrosine changes between time 0 and 120 min. All statistical analyses were performed using a general linear model adapted to the cross-over design [20], with adjustment on period factor and taking into account the patient as a random factor. The S21403 treatment effect as compared with placebo was estimated and tested using the difference between adjusted treatment means (on period). Statistical significance was defined as p<0.05.


In the randomised population, 11 patients (27.5%) had a history of hypertension: six patients (30%) in the sequence placebo-S21403 and five patients (25%) in the sequence S21403-placebo. Five patients (12.5%) had a history of hyperlipidaemia, three patients (15%) in sequence placebo-S21403 and two patients (10%) in sequence S21403-placebo.

Plasma glucose and insulin

At baseline, plasma insulin and plasma glucose levels were similar in the treatment and placebo groups (Table 2). After a single administration of S21403 40 mg a rapid stimulation of insulin secretion was observed compared with placebo. This insulin release induced a significant reduction of postprandial hyperglycaemia with S21403 compared with placebo at 120 min (Table 2).
Table 2

Effects of the treatments


Baseline value (T0) (mean±SD)

Last value (T120) (mean±SD)

Difference at T120 of adjusted mean of treatment





E±SEa (95% CI)


Plasma glucose (mmol/l)





−3.12±0.30 (−3.72 to −2.51)


Insulin (pmol/l)





179.05±44 (90.06 to 268.04)


Nitrotyrosine (μmol/l)





−0.094±0.014 (−0.122 to −0.067)


MDA (μmol/l)





−0.16±0.07 (−0.31 to −0.01)


TRAP (μmol/l)





4.36±1.83 (0.65 to 8.07)


oxLDL (U/l)





−8.597±1.568 (−11.772 to −5.423)


IL-6 (pg/ml)





−0.142±0.036 (−0.215 to −0.069)


IL-18 (pg/ml)





−129.20±30.34 (−190.61 to −67.79)


TNF-α (pg/ml)





−1.188±0.247 (−1.681 to −0.695)


MDA Malondialdehyde, oxLDL oxidised LDL, T0 time at 0 min, T120 time at 120 min, TRAP total radical-trapping antioxidant parameter

aEstimate±SE of the difference S21403 minus placebo: difference between adjusted treatment means

bTwo-sided Student’s t-test on adjusted treatment means

Primary efficacy criterion

The primary objective was to evaluate the acute effect of S21403 40 mg compared with placebo on the increase—induced by hyperglycaemic spikes during meals—in plasma nitrotyrosine between 0 and 120 min.

At baseline, the plasma nitrotyrosine level was similar in both treatment and placebo groups (Table 2).

At 120 min, the increase in the plasma nitrotyrosine level was significantly smaller in the S21403 group than in the placebo group (Table 2).

Secondary efficacy criteria

Oxidative stress

The acute effect of S21403 40 mg compared with placebo on oxidative stress induced by hyperglycaemic spikes during meals was also evaluated through the analysis of the plasma concentration changes over time of the following secondary criteria: MDA, TRAP and oxLDL.

The plasma MDA level was quite high in the S21403 group (Table 2). At 120 min, the increase in plasma MDA was significantly smaller in the S21403 group than in the placebo group (Table 2). Given the observed imbalance between the baseline measures of the two treatments at the breakfast-tests (time 0), an analysis adjusted on the baseline value was performed. The results were quite consistent with the previous analysis (−0.132; 95% CI −0.276 to 0.013, p=0.07).

The basal plasma levels of either TRAP and oxLDL were similar in both groups of treatments as shown in Table 2. The TRAP decrease over time was significantly smaller with S21403 than with placebo, as described in Table 2. At 120 min, the plasma oxLDL level was significantly decreased by S21403 vs placebo (Table 2).


The effect of S21403 on inflammation compared with placebo was assessed by analyses of plasma concentrations of IL-6, IL-18 and TNF-α, systemic markers of inflammation. Plasma levels of IL-6, IL-18 and TNF-α were similar in each treatment group at baseline (Table 2). During the breakfast-test a significant decrease of plasma levels of IL-6, IL-18 and TNF-α was observed over time with S21403 compared with placebo (Table 2).


There is widespread agreement that diabetes increases the risk of CVD [1]. Oxidative stress and inflammation are widely recognised as important pathogenic factors of atherosclerosis, even in diabetes mellitus [4].

Postprandial hyperglycaemia has recently been proposed as an independent risk factor for CVD [6, 7]. However, the effect of the postprandial state, particularly postprandial hyperglycaemia, on CVD is still a matter of debate [21, 22]; studies show that postprandial hyperglycaemia is accompanied by an increase of both oxidative stress and inflammatory markers [11, 12, 13, 14, 15]. This evidence is supported by findings showing an increase in vivo, during postprandial hyperglycaemia, of both protein kinase C and nuclear factor kappa B, two factors which regulate the generation of oxidative stress and inflammation [23, 24].

Our study confirms that a meal in diabetic patients is followed by an increase of oxidative stress and inflammation. However, for the first time, we show that modulating postprandial hyperglycaemia in type 2 diabetic patients by means of an oral hypoglycaemic agent, S21403, that specifically targets postprandial hyperglycaemia, can reduce the generation of oxidative stress and inflammation in the postprandial state.

We did not perform studies in normal healthy control subjects, therefore our study did not find out how much oxidative stress and inflammation are produced in this category of subjects, nor whether S21403 normalises them. However, the possibility that postprandial hyperglycaemia increases oxidative stress and inflammation in healthy subjects has previously been reported [12, 13]. Furthermore, evidence showing that modulation of postprandial hyperglycaemia by diet or an insulin analogue in type 2 diabetes [25, 26, 27], and by pramlintide [28] in type 1 diabetes, is accompanied by a significant decrease of oxidative stress, while nuclear factor kappa B activation is decreased when controlling postprandial hyperglycaemia by acarbose [24], convincingly suggests that the effect of S21403 on postprandial oxidative stress and inflammation is related to its ability to reduce postprandial hyperglycaemia.

Some of the markers evaluated deserve particular attention. Nitrotyrosine is a suitable marker of peroxynitrite and nitrosative stress generation [29] and an increased nitrotyrosine plasma level has been found in the plasma of diabetic patients [17, 30]. Interestingly, nitrotyrosine has recently been shown to be an independent risk factor for CVD [30]. Consistently, oxLDL as well as inflammatory cytokines are well recognised as being involved in atherogenesis [31, 32].

Therefore, emerging evidence suggesting that the modulation of postprandial hyperglycaemia makes it possible to reduce these factors, which are very probably involved in the pathogenesis of CVD, seems to be of clinical interest and relevance. This relevance, moreover, seems to be reinforced by several recent clinical trials. The STOP-NIDDM trial has presented data indicating that treatment of subjects with IGT with the α-glucosidase inhibitor acarbose, a compound which specifically reduces postprandial hyperglycaemia, is associated not only with a 36% reduction in the risk of progression to diabetes [33], but also with a 34% risk reduction in the development of new cases of hypertension and a 49% risk reduction in cardiovascular events [34]. In addition, in a subgroup of patients the carotid intima–media thickness was measured before randomisation and at the end of the study [35]. Acarbose treatment was associated with a significant decrease in the progression of intima–media thickness, an accepted marker of atherosclerosis [35]. Furthermore, in a recent meta-analysis of type 2 diabetic patients, acarbose treatment was associated with a significant reduction in cardiovascular events, even after adjusting for other risk factors [36]. Finally, very recently, the effects of two insulin secretagogues, repaglinide and glyburide, which are known to have different efficacy on postprandial hyperglycaemia, on carotid intima–media thickness and markers of systemic vascular inflammation in type 2 diabetic patients, were evaluated [37]. After 12 months, the postprandial glucose peak was 8.2±1.5 mmol/l in the repaglinide group and 9.9±1.7 mmol/l in the glyburide group (p<0.01). HbA1c showed a similar decrease in both groups (−0.9%). Carotid intima–media thickness regression, defined as a decrease of >0.020 mm, was observed in 52% of diabetic subjects receiving repaglinide and in 18% of those receiving glyburide (p<0.01). The reduction in carotid intima–media thickness was associated with changes in postprandial but not fasting hyperglycaemia [37]. Therefore evidence is emerging to suggest that treating postprandial hyperglycaemia may positively affect the development of the CVD.

This study only examined the effect of an acute administration of S21403, therefore no conclusion on the long-term effect of the treatment can be drawn at the moment. However, it seems reasonable that reducing postprandial oxidative stress and inflammation may result in a decrease of CVD.

In conclusion, this study shows that controlling postprandial hyperglycaemia with the specific agent S21403 significantly improves the cluster of oxidative stress and inflammation markers which are significantly increased in the postprandial state in diabetic patients. These data suggest that controlling postprandial hyperglycaemia may significantly contribute to the prevention of CVD in diabetes.

Duality of interest

This protocol was proposed and carried out by the investigators; the costs of running the study were supported by a grant from Institut de Recherches Servier, Paris, France. No further conflict of interest is declared.


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • R. Assaloni
    • 1
  • R. Da Ros
    • 1
  • L. Quagliaro
    • 2
  • L. Piconi
    • 2
  • A. Maier
    • 1
  • G. Zuodar
    • 1
  • E. Motz
    • 1
  • A. Ceriello
    • 1
    • 3
  1. 1.Department of Pathology and Medicine, Experimental and ClinicalUniversity of UdineUdineItaly
  2. 2.Morpurgo–Hofman Research Laboratory on AgeingUdineItaly
  3. 3.Internal MedicineUniversity of UdineUdineItaly

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