CN115785249B

CN115785249B - GLP-1 analogues and application thereof

Info

Publication number: CN115785249B
Application number: CN202211252991.3A
Authority: CN
Inventors: 韩京; 陈德
Original assignee: Jiangsu Normal University
Current assignee: Jiangsu Normal University
Priority date: 2022-10-13
Filing date: 2022-10-13
Publication date: 2023-07-21
Anticipated expiration: 2042-10-13
Also published as: CN116514952A; CN115785249A; CN116514952B

Abstract

The invention provides a GLP-1 analogue and application thereof, wherein the amino acid sequence of the GLP-1 analogue is one of sequences in SEQ ID NO. 1-SEQ ID NO. 10. The GLP-1 analogue has strong agonistic activity on a human GLP-1 receptor and high stability, and has the pharmacokinetic characteristic of once-a-day or once-a-week administration. The invention is a variant designed based on the bullfrog GLP-1 sequence, and has excellent weight and lipid reducing effects while retaining the therapeutic effect of GLP-1 analogues on diabetes; the preparation method has greater potential in the aspect of preparing medicaments for treating metabolic syndrome, such as diabetes, obesity, dyslipidemia and other diseases.

Description

GLP-1 analogues and application thereof

Technical Field

The invention relates to the technical field of biological medicines, in particular to GLP-1 analogues and application thereof.

Background

Diabetes mellitus (Diabetes mellitus, DM) is a group of metabolic diseases characterized by chronic hyperglycemia, caused by a variety of causes, both genetic and environmental. Due to relative or absolute lack of insulin secretion; or insulin action deficiency causes a series of metabolic disorders of sugar, protein, fat, water and electrolytes. Persistent hyperglycemia is an essential feature. Chronic diseases can cause multiple system damage, resulting in chronic complications of eyes, kidneys, nerves, heart and cerebral vessels, lower limbs and other organs. The rate of diabetes for Chinese adults is nearly 10%. Diabetes mellitus is classified as type 1 diabetes (T1 DM), type 2 diabetes (T2 DM), gestational diabetes, and other specific types of diabetes. The study found that more than 90% of the patients with T2DM are. Current methods of treatment for diabetes mainly include oral hypoglycemic agents and insulin treatment, but these methods produce toxic side effects in long-term treatment.

Glucagon-Like Peptide-1 (GLP-1) has the function of protecting beta cells, GLP-1 can act on islet beta cells, promote the transcription of insulin genes and the synthesis and secretion of insulin, stimulate the proliferation and differentiation of islet beta cells, inhibit the apoptosis of islet beta cells and increase the number of islet beta cells. In addition, GLP-1 can also act on islet alpha cells to strongly inhibit release of glucagon, act on islet delta cells to promote secretion of somatostatin, and can also act as paracrine hormone to participate in inhibiting secretion of glucagon. The research proves that GLP-1 can obviously improve the blood sugar condition of a T2DM animal model or a patient through various mechanisms, wherein the regeneration and repair of islet beta cells are promoted, and the effect of increasing the number of islet beta cells is particularly obvious, so that a very good prospect is provided for the treatment of T2 DM. However, natural GLP-1 has the limitation that its half-life is extremely short, and it is degraded by dipeptidyl peptidase (DPP-IV) after 2 to 3 minutes of secretion, and even if GLP-1 is exogenously administered, it is also degraded by DPP-IV rapidly. In addition, endogenous GLP-1 is rapidly metabolized by the kidneys, and its in vivo half-life is only 2-3min. Thus, there is a need to find novel GLP-1 receptor agonists that have similar biological activity to GLP-1, but are capable of long-acting in vivo.

Obesity and its related metabolic syndrome have become global public health problems, and the incidence and progression of many metabolic syndromes such as type 2 diabetes (T2 DM), nonalcoholic fatty liver disease (NAFLD), nonalcoholic steatohepatitis (NASH), dyslipidemia are closely related to obesity. GLP-1 can inhibit appetite and delay gastric emptying to realize the effect of reducing weight. Although GLP-1 has excellent hypoglycemic effect and a certain weight-reducing effect, the weight-reducing effect is still limited, and the lipid-regulating effect is weak. Thus, there remains a need for new GLP-1 analogs that are more safely tolerated, effective in weight loss, blood glucose control, and effective in lipid regulation in obese and diabetic patients.

Disclosure of Invention

The invention aims to provide GLP-1 analogues and application thereof, wherein the GLP-1 analogues can have strong agonistic activity on human GLP-1 receptor and high stability, can have the pharmacokinetic characteristics of once-a-day or once-a-week administration, can have excellent weight and lipid reducing effects on the treatment effect of diabetes; the preparation method has greater potential in the aspect of preparing medicaments for treating metabolic syndrome, such as diabetes, obesity, dyslipidemia and other diseases.

In order to achieve the above purpose, the technical scheme of the invention is as follows:

a GLP-1 analogue, the amino acid sequence of which is one of the following sequences:

(1)SEQ ID NO:1

(2)SEQ ID NO:2

(3)SEQ ID NO:3

(4)SEQ ID NO:4

(5)SEQ ID NO:5

(6)SEQ ID NO:6

(7)SEQ ID NO:7

(8)SEQ ID NO:8

(9)SEQ ID NO:9

(10)SEQ ID NO:10

the invention also provides pharmaceutically acceptable salts of GLP-1 analogues.

Preferably, the salt is a salt of a GLP-1 analog with one of the following compounds: hydrochloric acid, acetic acid, salicylic acid, lauric acid, cinnamic acid, citric acid, oxalic acid, lactic acid, and succinic acid.

The invention also provides a medicament prepared from the GLP-1 analogues, wherein the medicament is any one of a tablet, a capsule, an inhalant, a spray, an injection, a film, a patch, an emulsion or a compound preparation which is pharmaceutically acceptable, and the medicament consists of the GLP-1 analogues and pharmaceutically acceptable pharmaceutical excipients, carriers or diluents.

The invention also provides a pharmaceutical composition containing a GLP-1 analogue, which takes any GLP-1 analogue as an effective raw material or pharmaceutically acceptable salt thereof as an effective raw material, and is added with a pharmaceutically acceptable carrier or diluent.

The invention also provides application of the GLP-1 analogue or pharmaceutically acceptable salt thereof, or a pharmaceutical composition thereof or a medicament thereof in preparing medicines for treating metabolic diseases or symptoms. In particular aspects, the metabolic disease or disorder is diabetes, obesity, dyslipidemia. In a particular aspect, the diabetes is T1DM, T2DM or gestational diabetes. In a particular aspect, the medicament is for the treatment of more than one metabolic disease or disorder, for example, diabetes and obesity; obesity and dyslipidemia; diabetes and dyslipidemia; diabetes, dyslipidemia and obesity.

Compared with the prior art, the invention has the beneficial effects that:

the GLP-1 analogues provided by the invention are variants designed based on the bullfrog GLP-1 sequence, have unexpected excellent weight and lipid reduction effects while retaining the therapeutic effect of the GLP-1 analogues on diabetes, and have better glucose reduction effects and remarkably improved weight and lipid reduction effects compared with the GLP-1 analogues on the market, and have more potential in the treatment of diseases such as diabetes, obesity, dyslipidemia and the like. In addition, the GLP-1 analogues provided by the invention have strong agonistic activity on human GLP-1 receptor and stable chemical property, and have pharmacokinetic characteristics for supporting once-a-day or once-a-week administration. The GLP-1 analogue provided by the invention has a significantly better treatment effect on metabolic diseases such as T2DM, obesity, dyslipidemia and the like than the existing marketed drugs. Therefore, the GLP-1 analogue provided by the invention is suitable for being used as an active ingredient of medicaments for treating metabolic diseases (such as diabetes, obesity, dyslipidemia and the like).

Drawings

FIG. 1 is a graph showing the results of acute hypoglycemic events in ICR mice for a single administration of each test subject;

FIG. 2 is a graph showing the results of a long-acting hypoglycemic effect of a single administration of each test subject on db/db mice;

figure 3 shows a graphical representation of the percent change in body weight of each subject over 21 days of prolonged DIO mice administration.

Detailed Description

The invention is described in further detail below with reference to the drawings and the specific examples.

Unless defined otherwise herein, scientific and technical terms used in this application shall have the meanings commonly understood by one of ordinary skill in the art. Generally, the terms and methods described herein used in connection with chemistry, biology, pharmacology are well known and commonly used in the art.

In addition, the volumes of amino acids according to the invention are abbreviated as follows according to the nomenclature rules of IUPAC-IUB:

alanine (Ala, a); arginine (Arg, R); asparagine (Asn, N); aspartic acid (Asp, D); cysteine (Cys, C); glutamic acid (Glu, E); glutamine (Gln, Q); glycine (Gly, G); histidine (His, H); isoleucine (Ile, I); leucine (Leu, L); lysine (Lys, K); methionine (Met, M); phenylalanine (Phe, F); proline (Pro, P); serine (Ser, S); threonine (Thr, T); tryptophan (Trp, W); tyrosine (Tyr, Y); valine (Val, V).

In addition, unless explicitly indicated, all amino acid residues in the polypeptide compounds of the invention are preferably in the L configuration.

In addition, "-NH at the C-terminus of the sequence ₂ "part indicates an amide group (-CONH) at the C-terminus ₂ )。

In addition, the unnatural amino acid alpha-aminoisobutyric acid (Aib) is used in the sequences of the invention in addition to the natural amino acids.

The invention is illustrated by the following examples, which are not intended to be construed as limiting the scope of the invention.

Example 1

Synthesis of polypeptide compound of SEQ ID No. 1

(1) Swelling of the resin

0.278g (0.1 mmol equivalent) of Rink Amide MBHA resin with a loading of 0.36mmol/g was weighed into a 25mL reactor, the resin was alternately washed 1 time with 7mL of DCM and methanol, 2 times with 7mL of DCM, then the resin was swollen with 7mL of DCM for 1h, and finally the resin was washed 3 times with 7mL of DMF.

(2) Removal of Fmoc protecting groups from resin

Transferring the swelled resin into a PSI-200 polypeptide synthesizer, adding 7mL of 20% piperidine/DMF (v/v) for reaction at room temperature for 5min, filtering off the deprotection solution, washing the resin once by 7mL of DMF, adding 7mL of 20% piperidine/DMF (v/v) deprotection solvent for reaction with the resin for 15min, and washing the resin for 4 times by 7mL of DMF for 2min each time to obtain the Rink resin without Fmoc protecting groups.

(3) Synthesis of Fmoc-Ala-Rink amide-MBHAresin

Fmoc-Ala-OH (0.4 mmol) was weighed, dissolved in 2mL of DMF, 3mL of DIC/HOBt (0.4 mmol/0.44 mmol) condensing agent was added, the mixture was added to the reactor, the reaction was allowed to proceed with shaking at room temperature for 2 hours, the reaction solution was filtered off, the resin was washed 4 times with 7mL of DMF, and the reaction coupling was checked for completion or incomplete coupling for 2 times using Kaiser reagent.

(4) Extension of peptide chain

And (3) according to the sequence of the peptide chain, repeating the deprotection and coupling steps to sequentially connect corresponding amino acids until the peptide chain is synthesized. Wherein Lys of the side chain modification site adopts Fmoc-Lys (Dde) -OH protection strategy, and Boc-His (Boc) -OH is used as His of the N terminal.

(5) Modification of Lys side chains

After the peptide chain synthesis is completed, 7mL of 2% hydrazine hydrate/DMF (v/v) is added to selectively remove the Dde protecting group of Lys, and after the Dde protecting group is removed, 0.4mmol of Fmoc-Glu-OtBu,0.4mmol of DIC and 0.44mmol of HOBt are added to carry out oscillation reaction for 2h. After removal of Fmoc protecting groups, 0.4mmol Fmoc-Glu-OtBu,0.4mmol DIC and 0.44mmol HOBt were added again and reacted with shaking for 2h. After Fmoc protecting groups were removed, 0.4mmol of palmitic acid, 0.4mmol of DIC and 0.44mmol of HOBt were added for condensation reaction for 2h, and after completion of the reaction the resin was washed 4 times with 7mL of DMF.

(6) Cleavage of polypeptides

The obtained resin connected with the polypeptide is transferred into a round bottom bottle, 5mL of a cutting agent Reagent R (TFA/benzyl sulfide/phenol/EDT, 90:5:3:2, V/V) is used for cutting the resin, the resin is reacted for 2 hours in an oil bath at the constant temperature of 30 ℃, the cutting fluid is poured into 40mL of glacial ethyl ether, the crude product is washed 3 times by 15mL of glacial ethyl ether after refrigerated centrifugation, and finally the crude peptide is obtained by drying with nitrogen.

(7) Purification and characterization of polypeptides

Dissolving the target polypeptide crude product in water, filtering with 0.25 μm microporous membrane, and purifying with island jin preparation type reversed phase HPLC system. Chromatographic conditions were C18 reverse phase preparation column (250 mm. Times.20 mm,12 μm); mobile phase a:0.1% TFA/water (V/V), mobile phase B: methanol (V/V); the flow rate is 8mL/min; the detection wavelength was 214nm. Eluting with linear gradient (20-70% B/30 min), collecting target peak, removing methanol, lyophilizing to obtain pure product with purity greater than 98%, and determining molecular weight of target polypeptide by LC-MS. Theoretical relative molecular mass 3982.6.ESI-MS M/z calculated [ M+3H] ³⁺ 1328.5,[M+4H] ⁴⁺ 996.6; observed value [ M+3H] ³⁺ 1328.0,[M+4H] ⁴⁺ 996.3。

Example 2

Synthesis of polypeptide compound of SEQ ID No. 2

The synthesis method is the same as that of example 1, 0.11g of the target peak is collected and freeze-dried to obtain a pure product, the purity is more than 98%, and the molecular weight of the target polypeptide is confirmed by MS. The theoretical relative molecular mass is 3983.5.ESI-MS M/z calculated [ M+3H] ³⁺ 1328.8,[M+4H] ⁴⁺ 996.9; observed value [ M+3H] ³⁺ 1328.3,[M+4H] ⁴⁺ 996.5。

Example 3

Synthesis of polypeptide compound of SEQ ID No. 3

The synthesis method is the same as that of example 1, 0.09g of the target peak is collected and freeze-dried to obtain a pure product, the purity is more than 98%, and the molecular weight of the target polypeptide is confirmed by MS. The theoretical relative molecular mass is 3982.6.ESI-MS M/z calculated [ M+3H] ³⁺ 1328.5,[M+4H] ⁴⁺ 996.6; observed value [ M+3H] ³⁺ 1328.0,[M+4H] ⁴⁺ 996.3。

Example 4

Synthesis of polypeptide compound of SEQ ID No. 4

The synthesis method is the same as that of example 1, 0.10g of the target peak is collected and freeze-dried to obtain a pure product, the purity is more than 98%, and the molecular weight of the target polypeptide is confirmed by MS. The theoretical relative molecular mass is 3814.4.ESI-MS M/z calculated [ M+3H] ³⁺ 1272.5,[M+4H] ⁴⁺ 954.6; observed value [ M+3H] ³⁺ 1272.0,[M+4H] ⁴⁺ 954.2。

Example 5

Synthesis of polypeptide compound of SEQ ID No. 5

The synthesis method is the same as that of example 1, 0.11g of the target peak is collected and freeze-dried to obtain a pure product, the purity is more than 98%, and the molecular weight of the target polypeptide is confirmed by MS. The theoretical relative molecular mass is 3815.3.ESI-MS M/z calculated [ M+3H] ³⁺ 1272.8,[M+4H] ⁴⁺ 954.8; observed value [ M+3H] ³⁺ 1272.3,[M+4H] ⁴⁺ 954.5。

Example 6

Synthesis of polypeptide compound of SEQ ID No. 6

(1) Swelling of the resin

0.262g (0.1 mmol equivalent) of Rink Amide MBHA resin with a loading of 0.382mmol/g was weighed into a 25mL reactor, the resin was alternately washed 1 time with 7mL of DCM and methanol, 2 times with 7mL of DCM, then the resin was swollen with 7mL of DCM for 1h, and finally the resin was washed 3 times with 7mL of DMF.

(2) Removal of Fmoc protecting groups from resin

Transferring the swelled resin into a PSI-200 polypeptide synthesizer, adding 7mL of 20% piperidine/DMF (v/v) for reaction at room temperature for 5min, filtering off the deprotection solution, washing the resin once by 7mL of DMF, adding 7mL of 20% piperidine/DMF (v/v) for reaction with the resin for 15min, and washing the resin 4 times by 7mL of DMF for 1.5min each time to obtain the Rink resin without Fmoc protecting groups.

(3) Synthesis of Fmoc-Ala-Rink amide-MBHAresin

Fmoc-Ala-OH (0.4 mmol) was weighed, dissolved in 3mL 10% DMF/DMSO (v/v), 2mL DIC/HOBt (0.4 mmol/0.44 mmol) condensing agent was added, pre-activated for 30min, the activated amino acid was added to the reactor, the reaction was stirred at room temperature for 2h, the reaction solution was filtered off, the resin was washed 4 times with 7mL DMF, and Kaiser reagent was used to check if the reaction coupling was complete, if not, 2 times.

(4) Extension of peptide chain

And (3) according to the sequence of the peptide chain, repeating the deprotection and coupling steps to sequentially connect corresponding amino acids until the peptide chain is synthesized. Wherein, the Lys at the 12-position can be Fmoc-Lys (Alloc) -OH, fmoc-Lys (Dde) -OH, fmoc-Lys (Mtt) -OH or Fmoc-Lys (ivDde) -OH, etc. Fmoc-Lys (Dde) -OH protection strategy was used in this example, while Boc-His (Boc) -OH was used for the N-terminal His.

(5) Modification of Lys side chains

After the peptide chain synthesis is completed, 7mL of 2% hydrazine hydrate/DMF (v/v) is added to selectively remove Dde protecting group of Lys at 12 th site, after the Dde protecting group is removed, 0.4mmol of Fmoc-AEEA-OH,0.4mmol of DIC and 0.44mmol of HOBt are added, and the oscillation condensation reaction is carried out for 2h. After removal of Fmoc protecting groups, 0.4mmol Fmoc-AEEA-OH,0.4mmol DIC and 0.44mmol HOBt were added again and the reaction was performed by shaking for 2h. After removal of Fmoc protecting groups, 0.4mmol Fmoc-Glu-OtBu,0.4mmol DIC and 0.44mmol HOBt were added and the reaction was performed by shaking for 2h. After Fmoc protecting groups were removed, 0.4mmol of mono-tert-butyl octadecanedioate, 0.4mmol of DIC and 0.44mmol of HOBt were added for condensation reaction for 2h, and after completion of the reaction the resin was washed 4 times with 7mL of DMF.

(6) Cleavage of polypeptides

(7) Purification and characterization of polypeptides

Dissolving the target polypeptide crude product in water, filtering with 0.25 μm microporous membrane, and purifying with island jin preparation type reversed phase HPLC system. Chromatographic conditions were C18 reverse phase preparation column (250 mm. Times.20 mm,12 μm); mobile phase a:0.1% TFA/water (V/V), mobile phase B: methanol (V/V); the flow rate is 8mL/min; the detection wavelength was 214nm. Eluting with linear gradient (20-80% B/30 min), collectingTarget peak, removing methanol, lyophilizing to obtain 0.11g of pure product with purity greater than 98%, and confirming molecular weight of target polypeptide by LC-MS. The theoretical relative molecular mass is 4330.9.ESI-MS M/z calculated [ M+3H] ³⁺ 1444.6,[M+4H] ⁴⁺ 1083.7; observed value [ M+3H] ³⁺ 1444.1,[M+4H] ⁴⁺ 1083.3。

Example 7

Synthesis of polypeptide compound of SEQ ID No. 7

The synthesis method is the same as that of example 6, 0.12g of the target peak is collected and freeze-dried to obtain a pure product, the purity is more than 98%, and the molecular weight of the target polypeptide is confirmed by MS. The theoretical relative molecular mass is 4331.9.ESI-MS M/z calculated [ M+3H] ³⁺ 1445.0,[M+4H] ⁴⁺ 1084.0; observed value [ M+3H] ³⁺ 1444.4,[M+4H] ⁴⁺ 1083.5。

Example 8

Synthesis of polypeptide compound of SEQ ID No. 8

The synthesis method is the same as that of example 6, 0.12g of the target peak is collected and freeze-dried to obtain a pure product, the purity is more than 98%, and the molecular weight of the target polypeptide is confirmed by MS. The theoretical relative molecular mass is 4330.9.ESI-MS M/z calculated [ M+3H] ³⁺ 1444.6,[M+4H] ⁴⁺ 1083.7; observed value [ M+3H] ³⁺ 1444.1,[M+4H] ⁴⁺ 1083.3。

Example 9

Synthesis of polypeptide compound of SEQ ID No. 9

The synthesis method is the same as that of example 6, 0.11g of the target peak is collected and freeze-dried to obtain a pure product, the purity is more than 98%, and the molecular weight of the target polypeptide is confirmed by MS. Management deviceThe theoretical relative molecular mass is 4162.7.ESI-MS M/z calculated [ M+3H] ³⁺ 1388.6,[M+4H] ⁴⁺ 1041.7; observed value [ M+3H] ³⁺ 1388.0,[M+4H] ⁴⁺ 1041.3。

Example 10

Synthesis of polypeptide compound of SEQ ID No. 10

The synthesis method is the same as that of example 6, 0.12g of the target peak is collected and freeze-dried to obtain a pure product, the purity is more than 98%, and the molecular weight of the target polypeptide is confirmed by MS. The theoretical relative molecular mass is 4163.7.ESI-MS M/z calculated [ M+3H] ³⁺ 1388.9,[M+4H] ⁴⁺ 1041.9; observed value [ M+3H] ³⁺ 1388.4,[M+4H] ⁴⁺ 1041.5。

Example 11

Determination of agonistic Activity of polypeptide Compounds on human GLP-1 receptor

Agonism of the receptor by the polypeptide compounds was determined by functional assays and GLP-1 receptor agonism was measured by measuring cAMP response of HEK-293 cell lines stably expressing human GLP-1 receptor. Cells stably expressing the GLP-1 receptor were split into T175 flasks and grown in medium (DMEM/10% FBS) overnight to near confluence, then the medium was removed, and the cells were washed with calcium and magnesium free PBS and then protease treated with Actuase enzyme. The detached cells were washed and resuspended in assay buffer (20mM HEPES,0.1%BSA,2mM IBMX,1 ×hbss) and cell density was determined and 25 μl aliquots were dispensed into wells of 96-well plates. For measurement, 25 μl of a solution of the test polypeptide compound in the assay buffer was added to the wells, followed by incubation at room temperature for 30 minutes. The cAMP content of cells was determined based on Homogeneous Time Resolved Fluorescence (HTRF) using the Cisbio kit. After addition of HTRF reagents diluted in lysis buffer (kit components), the plates were incubated for 30 minutes and then the fluorescence ratio at 665/620nm was measured. By detecting the concentration that caused 50% of activation of the maximal response (EC ₅₀ ) To quantify the in vitro potency of the agonist.

The test data (nM) in the examples of this patent application are shown in Table 1 below, and although the test data is stated in terms of a number of significant digits, it should not be considered to indicate that the data has been determined to be exactly a significant digit.

Table 1: agonistic activity of polypeptide compounds on human GLP-1 receptor

As shown in Table 1, all polypeptide compounds showed strong agonistic activity to GLP-1 receptor, while all polypeptide compounds showed better GLP-1 receptor agonistic activity than GLP-1.

Example 12

Solubility and stability test of polypeptide Compounds

Before testing the solubility and stability of polypeptide compounds, the purity was first determined using HPLC. Then, based on the determined% purity, 10mg of polypeptide compound was dissolved in 1mL of solution in a different buffer system, and gently stirred for 2 hours. After centrifugation at 4500rpm for 20 minutes, the supernatant was analyzed by HPLC to determine the peak area. And then comparing the sample solution with the corresponding sample standard solution, and calculating the relative concentration of the sample solution. For stability testing, an aliquot of the supernatant obtained from solubility was stored at 40 ℃ for 7 days, then the sample was centrifuged at 4500rpm for 20 minutes, and the supernatant was analyzed by HPLC to determine peak area. By comparing the peak areas (t ₀ ) And the peak area (t) ₇ ) The "% remaining peptide" was obtained. Calculated according to the following formula: % residual peptide= [ (peak area t) ₇ )×100]Peak area t ₀ Stability was expressed as "% remaining peptide", and the results of the calculation are shown in table 2 below.

Table 2: solubility and stability of polypeptide compounds

As shown in the results of Table 2, the polypeptide compound of the present invention has a significantly improved solubility in the pH condition of an injection acceptable to the body, compared with natural GLP-1, and has favorable properties for the preparation. In addition, the polypeptide compounds of the invention also have high stability at pH 4.5 and neutral pH.

Example 13

Pharmacokinetic properties of polypeptide Compounds in rats

SD rats were given 50nmol/kg of liraglutide, semaglutide, SEQ ID NO:2 and SEQ ID NO:7 subcutaneously (s.c.) by injection and blood samples were collected 0.25h, 0.5h, 1h, 2h, 4h, 8h, 16h, 24h and 48h after administration. After precipitation of the proteins using acetonitrile, plasma samples were analyzed by LC-MS. The pharmacokinetic parameters and half-life were calculated using WinnLin 5.2.1 (non-compartmental model) (Table 3).

Table 3: pharmacokinetic profile of polypeptide Compounds in rats

Sample of	T _1/2 (h)	C _max (ng/mL)
			Liraglutide	2.3	489
Semaglutide	9.2	519
			SEQ ID NO:2	5.0	452
SEQ ID NO:7	13.3	429

As the results in table 3 show, the in vivo half-life of the polypeptide compounds of the present invention is significantly prolonged, superior to liraglutide or semaglutinide, and has pharmacokinetic profile supporting once-daily administration or once-weekly administration.

Example 14

Polypeptide compound acute hypoglycemic activity in mice

Male ICR mice, randomly grouped, 6 per group. Only drinking water, fasted overnight. Saline (10 mg/kg) was administered by intraperitoneal injection in a blank group, and the administration composition was 3 groups, and 30nmol/kg of semaglutinide, SEQ ID NO:2 and SEQ ID NO:7 were administered by intraperitoneal single injection, respectively, in a non-fasting state. After 30 minutes, each group of mice was given 3g/kg of glucose solution intraperitoneally. Blood glucose levels were measured with a glucometer at-30 min, 0min, 15min, 30min, 60min, 120 min.

As shown in the results of figure 1, the acute hypoglycemic experiments in ICR mice show that the polypeptide compounds of SEQ ID NO. 2 and SEQ ID NO. 7 remarkably improve the glucose tolerance level of the mice, have excellent hypoglycemic effect, and the hypoglycemic effect of the polypeptide compounds is obviously better than that of semaglutine.

Example 15

Long-acting hypoglycemic activity of polypeptide compound in mice

Male db/db mice were randomly grouped, 6 per group. Normal saline (10 mg/kg) was subcutaneously administered in a blank group, and the administered group was 2 groups, and the mice were fed and drunk freely during the experiment, and were subcutaneously injected in a single injection of 30nmol/kg semaglide and SEQ ID NO:7, respectively, in a non-fasting state. Blood glucose levels were measured with a glucometer at 0h before dosing, and at 4h, 6h, 24h, 48h, and 72h after dosing.

As shown in the results of FIG. 2, the results of the hypoglycemic experiments in db/db mice show that the polypeptide compound of the present invention shows a long-acting hypoglycemic activity which is obviously superior to that of the positive control Semaglutide.

Example 16

Influence of polypeptide Compounds on diet-induced obese (DIO) mice blood esters and body weight

Male C57BL/6J mice, weighing about 22g, were kept on the D12492 high fat diet of Research Diets for 18 weeks to make DIO mouse models. Before the start of the administration, DIO mice in each group were randomly grouped according to body weight, and were divided into 4 groups of 6, which were respectively a normal saline group (blank control group), a positive control group (semaglutide) and a test sample group (SEQ ID NO:2 and SEQ ID NO: 7). Each group of mice was injected subcutaneously with normal saline (10 mg/kg), semaglutide (30 nmol/kg), SEQ ID NO:7 (30 nmol/kg), and SEQ ID NO:2 (30 nmol/kg) once daily for 21 days of the administration period. Mice body weight changes were recorded daily. At the end of the experiment, each group of mice was sacrificed, blood serum was taken, liver homogenates were taken, and Triglyceride (TG) and Total Cholesterol (TC) contents of the liver and serum were measured.

As shown in the results of FIG. 3, the polypeptide compounds SEQ ID NO. 2 and SEQ ID NO. 7 of the present invention can reduce the body weight of mice by 28.8% and 31.6%, respectively, at a dose of 30nmol/kg for 3 weeks when administered continuously in DIO mice. Whereas semaglutide can only reduce the weight of mice by 16.0%. The results show that SEQ ID NO. 2 and SEQ ID NO. 7 have excellent weight reduction effect, and are obviously superior to semaglutinide.

Table 4: serum Total Cholesterol (TC) and Triglyceride (TG) levels 3 weeks after DIO mice treatment

Sample (dose)	Total cholesterol (mmol/L)	Triglyceride (mmol/L)
			Blank control (normal saline group)	9.15±0.56	1.98±0.22
Semaglutide(30nmol/kg)	7.98±0.42**	1.51±0.09*
			SEQ ID NO:2(30nmol/kg)	3.68±0.55***,###	0.63±0.18***,###
SEQ ID NO:7(30nmol/kg)	3.56±0.39***,###	0.52±0.12***,###

^* : p compared with the blank control group<0.05； ^** : p compared with the blank control group<0.01； ^*** : p compared with the blank control group<0.001； ^### : ratio to semaglutide group P<0.001 (One-WayANOVA, tukeypost hoc test) and the results are expressed as mean.+ -. SD of 6 mice per group.

Table 5: liver Total Cholesterol (TC) and Triglyceride (TG) levels 3 weeks after DIO mice treatment

Sample (dose)	Total cholesterol (mg/g)	Triglyceride (mg/g)
			Blank control (normal saline group)	17.33±1.67	102.56±9.26
Semaglutide(30nmol/kg)	14.33±1.22*	85.33±7.25**
			SEQ ID NO:2(30nmol/kg)	7.22±0.90***,###	46.89±7.28***,###
SEQ ID NO:7(30nmol/kg)	7.05±0.41***,###	42.25±5.33***,###

As shown in the results of tables 4 and 5, the polypeptide compounds SEQ ID NO. 2 and SEQ ID NO. 7 of the present invention can significantly reduce the Triglyceride (TG) and Total Cholesterol (TC) contents of serum and liver of mice by continuously administering the polypeptide compounds SEQ ID NO. 2 and SEQ ID NO. 7 in DIO mice for 3 weeks, and the serum and liver blood lipid reducing effects of the polypeptide compounds SEQ ID NO. 2 and SEQ ID NO. 7 are significantly stronger than those of the positive control drug semaglutide. The results show that SEQ ID NO. 2 and SEQ ID NO. 7 have the effects of reducing weight and reducing liver and serum blood lipid which are obviously superior to those of semaglutide, and the polypeptide compound has unexpected and excellent weight reduction and lipid regulation effects.

Claims

1. A GLP-1 analogue, characterized in that the amino acid sequence of the GLP-1 analogue is:

2. a pharmaceutically acceptable salt of a GLP-1 analogue, characterized in that: the amino acid sequence of the GLP-1 analog is the amino acid sequence of claim 1.

3. A pharmaceutically acceptable salt of a GLP-1 analogue according to claim 2, wherein the salt is a salt of the GLP-1 analogue with one of the following compounds: hydrochloric acid, acetic acid, salicylic acid, lauric acid, cinnamic acid, citric acid, oxalic acid, lactic acid, and succinic acid.

4. A medicament prepared from a GLP-1 analogue according to claim 1, which is any one of the pharmaceutically acceptable tablets, capsules, inhalants, sprays, injections, films, patches, emulsions or compound preparations, and which comprises a GLP-1 analogue according to claim 1 and a pharmaceutically acceptable pharmaceutical adjuvant, carrier or diluent.

5. A pharmaceutical composition containing a GLP-1 analogue, which is characterized in that the pharmaceutical composition takes the GLP-1 analogue as an effective raw material or takes a pharmaceutically acceptable salt of the GLP-1 analogue as an effective raw material as defined in claim 2 or 3, and a pharmaceutically acceptable carrier or diluent is added.