Mechanism of action
Lixisenatide is a potent and selective glucagon-like peptide-1 receptor agonist-1 (GLP-1). The GLP-1 receptor is the target for native GLP-1, the endogenous hormone of internal secretion, which potentiates the glucose-dependent secretion of insulin by beta cells of pancreatic islets. The action of lixisenatide is associated with its specific interaction with receptors GLP-1, leading to an increase in the intracellular content of cyclic adenosine monophosphate (cAMP). Lixisenatide stimulates secretion of insulin beta cells by pancreatic islets in response to hyperglycemia. With a decrease in the concentration of glucose in the blood to normal values, stimulation of insulin secretion stops, which reduces the risk of developing hypoglycemia. With hyperglycemia lixisenatide simultaneously suppresses the secretion of glucagon, but it still preserves the protective reaction of glucagon secretion in response to hypoglycemia.
A trend towards insulinotropic activity lixisenatide, including an increase in insulin biosynthesis and stimulation of pancreatic beta cells islets in animals. Lixisenatide slows down emptying the stomach, thereby reducing the rate of increase blood glucose concentrations after eating. Influence at gastric emptying can also contribute to weight loss body.
Pharmacodynamic effects
When administered once a day, patients with type 2 diabetes mellitus lixisenatide improves glycemic control by rapidly developing after its introduction and a continuous decrease in the concentration of glucose in the blood after eating and on an empty stomach.This effect of lixisenatide on the concentration of glucose in the blood after a meal was confirmed in a 4-week study comparing the use of lixisenatide in combination with metformin with liraglutide 1.8 mg once daily in combination with metformin.
Lixisenatide at a dose of 20 mcg once a day showed a greater decrease in area under the blood glucose concentration curve after a standard meal (standard thick breakfast), compared with the use of liraglutide 1.8 mg once a day. These observations also were confirmed in an 8-week study comparing the use of lixisenatide with liraglutide, when administered before breakfast, in combination with insulin glargine in combination or without combination with metformin. In this study, the decrease from the original value AUC0:30-4-30h The concentration of glucose in the blood after a sample with standard food load (standard thick breakfast) was: in group of lixisenatide -13.33 h * mmol / L (-240.15 h * mg / dl), in the group of liraglutide 1.2 mg-7.32 h * mmol / l (-131.82 h * mg / dl) and in the group of liraglutide in a dose of 1.8 mg - 8.72 h * mmol / l (-157 h * mg / dL).
Clinical efficacy and safety
The effect of the drug Lixumia® on glycemic control was studied in six randomized, double-blind, placebo-controlled clinical trials and one randomized, open, controlled active drug (exenatide) a study in which, in total, included 3825 patients with type 2 diabetes mellitus (lixisenatide was used in 2445 patients (48.2% of men and 51.8 % women). 768 patients (447 patients were randomized to receive lixisenatide) were aged ≥65 years and 103 patients (57 patients were randomized to receive lyxisenatide) were ≥75 years of age.
Completed clinical Phase III studies showed that 90% of patients continued treatment with Lycumia® at a maintenance dose of 20 μg once a day at the end of the 24-week treatment period.
Influence on glycemic control
When using the drug Lysymy ® has a greater, compared with placebo, reduction in the glycosylated hemoglobin (HbA1C) in the blood (regardless of concomitant treatment). In addition, the drug Lixumia ® with a single administration during the day showed no less decrease in the HbA1Cthan exenatide when administered twice a day.This effect on the decrease in the HbA1C remained in long-term studies up to 2 years.
Decrease in HbA1C was reliable with daily single administration of the drug Lixumia®, both in the morning and in the evening.
Adding lixisenatide to treatment with oral hypoglycemic drugs
The preparation Lixumia® in combination with metformin, oral hypoglycemic drug of the sulfonylurea group, or with combinations of these drugs in end of the 24-week treatment period, compared with placebo, showed clinically and a statistically significant decrease in HbA1C, the concentration of glucose in the blood on an empty stomach and 2 hours after a meal (sample with standard food load).
Adding lixisenatide to monotherapy with metformin
In placebo-controlled addition studies lixisenatide to metformin led to a decrease in the HbA1C by 0.83% and a decrease of 0.42% with the addition of a placebo. Percentage of patients who achieved a decrease in HbA1C up to <7%, was 43% in the lyxisenatide group and 24% in the placebo group.
In a controlled active drug (exenatide) study at the end of the main 24-week treatment period, once-a-day administration of the drug LYXOEMIA® showed no less decrease indicator HbA1C, compared with twice during the day by the administration of exenatide (respectively, 0.79% and 0.96%, respectively); At the same time, almost the same percentage of patients who achieved a reduction in the indicator HbA1C to <7%: 48.5% in the lixisenatide group and 49.8% in the exenatide group.
Adding lixisenatide to treatment with one of the oral hypoglycemic drugs of the sulfonylurea group in monotherapy and in combination with metformin
The addition of lixisenatide to treatment with one of the oral hypoglycemic drugs of the sulfonylurea group in monotherapy and in combination with metformin resulted in a decrease in the index HbA1C by 0.85% compared with that of a placebo supplement of -0.10%. Percentage of patients who achieved a reduction in the indicator HbA1C to <7%, was 36.4% with the addition of lixisenatide and 13.5% with the addition of placebo.
The addition of lixisenatide to a combined therapy, including basal insulin
The drug Lixumia® when used together with basal insulin in monotherapy, or with a combination of basal insulin with metformin,or with a combination of basal insulin with an oral hypoglycemic drug of the sulfonylurea group caused a statistically significant decrease in the index HbA1C and glucose concentrations 2 hours after a standard meal compared with placebo. At the end of the main 24-week treatment period, the decrease in the daily dose of insulin was significantly higher in the LYCUMSIA® group compared to the placebo group, compared to its doses before the addition of LYXYMY® to the treatment.
When lixisenatide was added to basal insulin therapy in monotherapy or in combination with metformin, a decrease was observed HbA1C by 0.74% against -0.38% with the addition of placebo, and with the addition of lixisenatide to basal insulin therapy in monotherapy or in combination with the oral hypoglycemic drug of the sulfonylurea group, a decrease was observed HbA1C by 0.77% against -0.11% with the addition of a placebo.
Influence on the concentration of glucose in blood plasma on an empty stomach
In placebo-controlled studies, the mean values of the decrease in fasting plasma glucose concentration achieved with LYXOXYUM® by the end of the 24-week treatment period were in the range of 0.42 mmol / l to -1.19 mmol / l.
Effect on postprandial (after eating) blood glucose concentration
Treatment with the drug Lixumia®, regardless of concomitant therapy, resulted in a statistically superior placebo effect in reducing 2-hour postprandial (determined 2 hours after a standard meal) of blood glucose. By the end of the 24-week treatment period, in all studies in which the determination was made postprandial glucose concentration in the blood, ego reduction of 2- hour postprandial blood glucose concentrations were in the range of 4.51 mmol / L to -7.96 mmol / L (compared to 2-hour postprandial blood glucose concentrations prior to the use of LYXYMUM®); 26.2% -46.8% of patients had 2- hour postprandial blood glucose concentrations below 7.8 mmol / L.
Effect on body weight
In all controlled trials, treatment with Lysumia® in combination with metformin, basal insulin, and / or the oral hypoglycemic drug of the sulfonylurea group at the end of the main 24-week treatment period resulted in an average weight loss of up to-2.96 kg, which persisted in long-term studies to 2 years.
The decrease in body weight did not depend on the occurrence of nausea and vomiting.
Effect on the function of beta cells of pancreatic islets
The preparation Lixumia® improves the function of beta cells of pancreatic islets, determined using a homeostatic model for the evaluation of beta-cell function (HOMA-β).
In patients with diabetes mellitus 2 type (n= 20) after a single injection of the drug Lysumia® was demonstrated restoration of the first phase of insulin secretion and improvement of the second phase of insulin secretion in response to intravenous bolus administration of glucose.
Effect on heart rate (heart rate)
In placebo-controlled clinical studies of the III phase did not show an increase in mean heart rate.
In a 4-week clinical study, compared with liraglutide in group lixisenatide (20 mcg once a day), heart rate decreased by an average of 3.6 beats per minute, and in the group of liraglutide (1.8 mg once a day) the heart rate decreased by 5.3 beats per minute.
Influence on blood pressure (BP)
In placebo-controlled Phase III studies a decrease in the average values of systolic and diastolic blood pressure by 2.1 mm Hg. Art. and by 1.5 mm Hg. art., respectively.