CN101280009A - Exendin4 polypeptide fragments - Google Patents
Exendin4 polypeptide fragments Download PDFInfo
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- CN101280009A CN101280009A CNA2008100084196A CN200810008419A CN101280009A CN 101280009 A CN101280009 A CN 101280009A CN A2008100084196 A CNA2008100084196 A CN A2008100084196A CN 200810008419 A CN200810008419 A CN 200810008419A CN 101280009 A CN101280009 A CN 101280009A
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Abstract
The invention relates to an Exendin fragment which is characterized in that the sequence of the polypeptide fragment is HGEGTX1TSDLSKQX2EEEAVKLFIEWLKNGX4PX5; wherein X1 is Phe or Tyr; X2 is Met,Ile or Leu; X4 is Gly or is deleted; X5 is Arg or is deleted. The polypeptide is of the capability of reducing blood suger and can be used to cure II diabetes. The invention further relates to the preparation method of Exendin fragment.
Description
Invention field
The present invention relates to the polypeptide fragment of Exendin 4 brachymemmas, this polypeptide has the effect of lowering blood glucose, can be used for treating type ii diabetes.
Background technology
The present invention is that application number is 200510040823.8 (Exendin 4 polypeptide fragments, the applying date: dividing an application 2005.6.29).
Because modern dietary structure and mode of life, countries in the world diabetic subject's number increases year by year, at present in state-owned 5,000 ten thousand patients, India has 6,000 ten thousand, the U.S. has 1,800 ten thousand, Japan has 6,000,000.
Diabetes are divided into two kinds, insulin-dependent diabetes mellitus (type i diabetes) and non insulin dependent diabetes (type ii diabetes), and wherein type ii diabetes accounts for more than 90% of diabetic subject.The type ii diabetes patient has showed many features, as insulin secretion quantity not sufficient after the meal, insulin secretion time lag, hyperglycemia etc.Fat type ii diabetes patient periphery cell Regular Insulin receptor sensitivity reduces, thereby produces the also high situation of insulin level in blood sugar height, the blood, and glycolated hemoglobin HbA1c is (healthy people is 4-6%) more than 8%.Can produce diabetic complication with that, as heart trouble and renal failure etc.The lowering blood glucose level just becomes the key of effective treatment type ii diabetes.
Nowadays, control of diabetes has six big class medicines, comprises the insulin secretion accelerating class: sulfonylurea and melitioneds, non-insulin secretion accelerating medicine: Regular Insulin, alpha-glucosidase inhibitor, biguanides and Thioagolinediones.Yet, according to the 6 year follow-up study report of Britain UKPDS to thousands of type ii diabetes patients, above-mentioned six class medicines are all powerless to the type ii diabetes patient, can not contain the continuous progressive deterioration of pancreatic beta cell, the HbA1c level can not be reduced, the generation of the complication of diabetes such as heart trouble, renal failure can not be stoped.Therefore need the new type ii diabetes medicine of research.
Nineteen ninety-five, United States Patent (USP) discloses a kind of huge lizard (Gila monster, isolating Exendin 4 polypeptide in saliva HelodeSuspectum) of producing from South America for No. 5424286.This peptide is made up of 39 amino-acid residues, and its structure and intestinal hormones glucagon-like-peptide-1 (GLP-1) have 40% homology on aminoacid sequence.
Studies show that Exendin 4 can combine with the acceptor of GLP-1 as the analogue of GLP-1.Exendin 4 can promote insulinogenic synthetic, and insulin secretion accelerating can lowering blood glucose, continuous action no longer after blood sugar is normal, thereby do not produce hypoglycemic coma, shock, safe and effective.It can reduce HbA1c, increases the β cell concentration, increases type ii diabetes patient insulin receptor susceptibility, effects such as glucagon suppression secretion.In April, 2005, the Exendin 4 of trade(brand)name Byetta obtains the drugs approved by FDA listing.(referring to Diabetes (1997)
46433-439; Ibid (1995)
441249-1258; Ibid (2002)
512796-2803; Ibid (1994)
532397-2403; Diabetes Care (2002)
25330-336; Ibid (2000)
2364-69; Ibid (2004)
22623-2635; JAMA (2002)
287373-379; N.Engl.J.Med. (2002) 346
393-436; Lanced (1998)
352837-853; Diabetes Endocrinology (2005)
146(4) 2069-2070; J.Clin.Endocrinology Metab (2004)
893469-3473.)
Many researchists actively transform Exendin 4 peptides, and obtaining with expectation can be for Exendin 4 variant more options more, more effective, more convenient production.CN1227567A discloses a kind of Exendin4 peptide of brachymemma, and it is made up of 30 amino-acid residues, and C-terminal is Arg or Tyr.A series of GLP-1 analogues have been studied by Lilly Co., Eli., and it can be used for the treatment of to long-term safety diabetes (referring to WO02047716A).And these results are that isolated experiment obtains, and estimate with the formation amount of what and cAMP of the size of GLP-1 receptor binding capacity, short insulinoma cell excreting insulin, have limitation (referring to J.Biol.Chem (1997)
27221201-21206; Regulatory Peptides (2003)
114153-158; Trend inPharmacological Sci. (2003)
24377-383; WO 03011892A).
In order to overcome deficiency of the prior art, the contriver is through painstaking efforts, obtained a kind of new C end brachymemma and C-terminal be the Exendin4 polypeptide fragment of Pro.Surprisingly, polypeptide with this structure has not only shortened the peptide chain length of Exendin 4 peptides about 1/4, greatly facilitates production practice, for the treatment diabetes provide a kind of new selection, and this Toplink resists the effect of carboxypeptidase effectively, keeps hypoglycemic activity enduringly.
Summary of the invention
One aspect of the invention provides Exendin4 polypeptide fragment and pharmacy acceptable salt or the ester with formula (I) structure:
HGEGTX
1TSDLSKQX
2EEEAVX
3LFIEWLKNGX
4PX
5 (I)
Wherein,
X
1Expression Phe or Tyr,
X
2Expression Met, Ile or Leu,
X
3Expression Lys,
X
4Expression Gly or disappearance,
X
5Expression Arg or disappearance.
Amino-acid residue (the X that the middle Exendin4 polypeptide fragment of formula (I) is the 6th
1) be preferably Tyr.In view of the convenience of pharmacokinetic, change a Phe in the molecule into Tyr, help
125The mark of iodine.
Amino-acid residue (the X that the middle Exendin4 polypeptide fragment of formula (I) is the 14th
2) can be among Met, Ile or the Leu any one, be preferably Met.
Amino-acid residue (the X that the middle Exendin4 polypeptide fragment of formula (I) is the 30th
4) preferred disappearance.
Preferred polypeptide fragment is: X
1Be Tyr, X
2Be Met, X
3Be Lys, X
4Disappearance, X
5Expression Arg or disappearance.
In this article, " Exendin4 polypeptide fragment of the present invention " refers to the Exendin4 polypeptide that blocks among the present invention, and it has the structure shown in the formula (I).In this article, this peptide species can abbreviate " E4 (f) ", " polypeptide fragment " or " polypeptide of the present invention " as.
The amino of the N-terminal of formula (I) polypeptide and the carboxyl and the amino acid side chain group of C-terminal can not modified, and can modify under the active prerequisite that does not influence polypeptide of the present invention basically, as forming " pharmaceutically acceptable ester " yet.The modification of amino acid side chain group is included but not limited to the acidylate of Methionin epsilon-amino group, the deacylation of the N-alkane of arginine, Histidine or Methionin.The modification of N-terminal amino group includes but not limited to take off-and amino, N-low alkyl group, N-two low alkyl groups and N-acyl group modify.The modification of C-terminal carboxylic group includes but not limited to acid amides, low alkyl group acid amides, dialkyl amide and lower alkyl esters modification.Preferred end group gets up with the protectiveness radical protection known to the skilled in protein chemistry field, as ethanoyl, trifluoroacetyl group, Fmoc (9-fluorenyl-methoxycarbonyl), Boc (tertbutyloxycarbonyl), Alloc (allyloxycarbonyl), C
1-6Alkyl, C
2-8Thiazolinyl, C
7-9Aralkyl etc.The present invention does not preferably modify the amino of formula (I) polypeptide N-terminal and the carboxyl and the amino acid side chain group of C-terminal, and promptly the chemical group of N-terminal is still the alpha-amino group (NH on first amino acid (His)
2), the chemical group of C-terminal be C-terminal Pro carboxyl (COOH).The present invention also preferably carries out amidated to the carboxyl of C-terminal Pro, promptly is-CO NH
2
The method for expressing that generally acknowledged in the field under the method for expressing of polypeptide used herein and amino acid and chemical group was.Wherein amino acid whose abbreviation can be with reference to definition in the table 1.In this article, if do not particularly point out, amino acid refers generally to the amino acid of L-type.
Table 1 amino acid abbreviations table
| The amino acid trigram letter abbreviations of abridging | The amino acid trigram letter abbreviations of abridging |
| L-Ala Ala A arginine Arg R l-asparagine Asn N aspartic acid Asp D halfcystine Cys C glutamine Gln Q L-glutamic acid Glu E glycine Gly G Histidine His H Isoleucine Ile I | Leucine Leu L Methionin Lys K methionine(Met) Met M phenylalanine Phe F proline(Pro) Pro P Serine Ser S Threonine Thr T tryptophane Trp W tyrosine Tyr Y Xie Ansuan Val V |
" pharmacy acceptable salt " refers to the salt that some small molecular acidities or basic cpd and polypeptide form, and generally can increase the solvability of polypeptide, and formed salt does not change the activity of polypeptide basically.For example, can hydrochloric acid, phosphoric acid, sulfuric acid, acetate, succsinic acid, toxilic acid, citric acid etc. be arranged with the salifiable acid of polypeptide shape of the present invention usually; Oxyhydroxide, ammonium, carbonate of basic metal or alkaline-earth metal etc. can be arranged with the salifiable alkali of polypeptide shape of the present invention.
The blood sugar reducing function of polypeptide of the present invention can be verified by the experimental technique of affiliated field routine, as cytologic experiment, experimentation on animals etc.In the specific embodiment of the present invention,, preferably identify the blood sugar reducing function of polypeptide by diabetes animal model in order to overcome the limitation of isolated experiment.As db/db type ii diabetes mouse, Goto Kokizaki type ii diabetes rat, KK diabetic mice, tetraoxypyrimidine (alloxan) artificial induction diabetic mice.By these animal experiments, find that formula (I) Exendin4 polypeptide fragment involved in the present invention all has blood sugar reducing function in the lasting body, can be used in treatment of diabetes.
Therefore, another aspect of the present invention provides and has contained above-mentioned pharmaceutical composition with Exendin 4 polypeptide fragments of formula (I) structure, and it can be used for the treatment of diabetes, especially treats type ii diabetes.Said composition can contain one or more in the Exendin4 polypeptide fragment of the present invention, preferably only contains a kind of Exendin 4 polypeptide fragments.Said composition can contain one or more pharmaceutically acceptable thinners, vehicle or carrier, preferred said composition is a unit dosage form, as tablet, film, pill, capsule (comprise and continue release or postpone to release the form of establishing), pulvis, granule, tincture, syrup and emulsion agent, disinfectant injection solution or suspension, aerosol or liquid spray, drops, injection, automated injection device or suppository.For example, with tablet or capsule oral administration, above-mentioned active medicine component can be combined with a kind of oral acceptable inert support of nontoxic pharmacology, as ethanol, and glycerine, water or its combination.WO2004035754A and WO2004036186A disclose a kind of slow release formulation that can be used for comprising the Exendin4 polypeptide respectively, and the active polypeptide of formula of the present invention (I) preferably uses this formulation (full text of WO2004035754A and WO2004036186A is included this paper reference in).
The present invention also provides above-claimed cpd or the purposes of pharmaceutical composition in the medicine of preparation treatment diabetes, is preferred for treating type ii diabetes.Pharmaceutical composition of the present invention can carry out administration by the known administering mode of one of ordinary skill in the art, and for example oral, rectum, hypogloeeis, lung, transdermal, ion penetrate, vagina and intranasal administration.The preferred gi tract external administration of pharmaceutical composition of the present invention is as subcutaneous, intramuscular or intravenous injection.Thereby medicine of the present invention can be regulated Regular Insulin and keep glucose level enduringly.Dosage changes to some extent according to the situation of action time of dosage form and expectation and treatment target, the required amount of actual therapeutic can by the doctor according to practical situation (as, patient's the state of an illness, body weight etc.) and determine easily.For general adult, the amount of daily requirement administration 0.1-100 μ g, in the scope of preferred 1-20 μ g, more preferably 5-10 μ g.Dosage also can be determined with reference to the dosage of commercial exendin-4 polypeptide medicine.
In addition, the present invention also provides a kind of method of chemosynthesis aforementioned polypeptides.Polypeptide by the synthetic known structure of chemical process all is conspicuous for one of ordinary skill in the art.Detailed scheme can be carried out with reference to the described method of following document, can be as synthesizing polypeptide with reference to " the Solid Phase Peptide Synthesis " of J.M.Steward and J.D.Young with solid phase method, second edition (Pierce Chemical Co., Rockford, Illinois (1984)) and J.Meienhofer " Hormonal Proteins andPeptides ", the 2nd volume (Academic Press, New York (1973)); Can be with the synthetic polypeptide of liquid phase method with reference to " the The Peptides " of E.Schroder and K.Lubke, the 1st volume (Academic Press, New York (1965)) (full text of these documents is included this paper reference in).In a specific embodiments of the present invention, preferably by the synthetic polypeptide of the present invention of solid phase method.
In yet another aspect, the invention provides the nucleic acid that a kind of coding has formula (II) polypeptide of sequence
HGEGTX
1TSDLSKQX
2EEEAVX
3LFIEWLKNGX
4PX
5 (II)
Wherein,
X
1Expression Phe or Tyr,
X
2Expression Met, Ile or Leu,
X
3Expression Lys,
X
4Expression Gly or disappearance,
X
5Expression Arg or disappearance.
E
4(f) gene of polypeptide fragment adopts the preference codon of E.Coli.For example, if with the nucleic acid of this code book invention polypeptide of escherichia coli expression, the then preferably colibacillary preference codon of the codon of this nucleic acid.
The present invention also provides a kind of method for preparing aforementioned polypeptides with gene engineering method.This method comprises: a), fermentation energy is expressed the host cell of polypeptide of the present invention; B), separate the purification expression product.This method can further comprise the step of the described expression product of cracking.When gene engineering method is produced moderate polypeptide (20-60 amino-acid residue), because expression level is low, and degraded easily after expressing, so, generally be that polypeptide gene is attached on the carrier proteins, express in the fusion rotein mode, then with the method for chemistry or enzyme with the fusion rotein cracking, separate, purifying obtains desired polypeptides.This method yields poorly, and technology is numerous and diverse.Another kind method is according to amino acid sequence of polypeptide, is together in series expressing gene is a plurality of, express with suitable promotor, and then with the tandem polypeptide cracking, the preparation desired polypeptides.Many examples of successfully producing polypeptide have been arranged in this way, as producing insulin human (Proc, Natl, Acad, Sci, USA, 1984
814627-4631), thyrocalcitonin (JP62-226998), GLP-1 (WO95/17510).This method output height.The present invention preferably adopts the said gene series connection method to express polypeptide of the present invention.Aspect the tandem polypeptide cracking; the common method in field under can using; after the Lys residue is protected with citraconic anhydride (CitraconicAnhydride); peptide chain is cut off from tandem polypeptide intermediary Arg with trypsinase; (referring to J.D.Baxter. etc., Nature 1980 to slough citraconic acid (Citraconic acid) group through acid treatment again
285456-461; JP62-226998).As shown in Figure 1, in a preferred embodiment, this method can comprise: a), fermentation energy is expressed the bacterial cell of polypeptide of the present invention; B), collect thalline; C), smudge cells; D), extract tandem polypeptide; E), the polypeptide that obtains is carried out renaturation; F), cracking; G), with the final polypeptide products of high pressure liquid chromatography (HPLC) purification.
Because the gene engineering expression of polypeptide class (20-60 amino-acid residue) must link with carrier protein, otherwise can not get expression product, has only a peptide molecule in the fused protein molecule, account for 1/10th of fused protein molecule, output is very low, the kind of polypeptide is a lot of after such fused protein cracking, desired polypeptides separation and purification difficulty.The present invention will express after will making a plurality of polypeptide fundamental series connection, be desired polypeptides all in the fusion protein molecule of expression, and the kind of polypeptide is single after the cracking, output for the former more than ten times, and separation and purification is easy.X of the present invention
3Be Lyr, only cut off series connection molecule intermediary Arg during the fusion rotein cracking, so just keep E
4(f) molecule is complete.
E
4(f) the C-end is the effect of Pro opposing Carboxypeptidase A, B, helps keeping the stability of molecule.
E
4(f) Arg is as E
4(f) intermediate, in fact E
4(f) Arg is removed by the hydrolysis of protaminase class rapidly in blood and forms E
4(f), the two all can be used.
For the ease of understanding, below will present invention is described by specific embodiment and accompanying drawing.It needs to be noted that these descriptions only are exemplary descriptions, do not constitute limitation of the scope of the invention.According to the argumentation of this specification sheets, many modifications of the present invention have been obviously all concerning one of ordinary skill in the art.In addition, all reference of quoting of the application are all included this paper reference in.
Description of drawings
Fig. 1. with the technological process of production of gene engineering research fermentative production Exendin 4 polypeptide fragments.
The lasting hypoglycemic activity of Fig. 2 .Exendin 4 polypeptide fragments and the comparison of Exendin 4.
Fig. 3 .Exendin 4 polypeptide fragments are to the hypoglycemic activity of db/db type ii diabetes mouse.
Fig. 4 .Exendin 4 polypeptide fragments are to the hypoglycemic activity after the meal of Goto Kokizaki type ii diabetes rat.Curve 1 expression blank group, curve 2 expression administration groups.
Fig. 5 .Exendin 4 polypeptide fragments are to the hypoglycemic activity of tetraoxypyrimidine (alloxan) artificial glycosuria disease model mouse.
The promoting insulin secretion of Fig. 6 .Exendin 4 polypeptide fragments.Lines 1 expression administration group, lines 2 expression blank groups.
Embodiment
Solid phase synthesis Exendin 4 variant polypeptides
On available from the multiple automatic peptide synthesizer SyRo II of MultiSyn Tech company, synthesize by solid phase method.Amino acid whose α is amino with 9-fluorenylmethyloxycarbonyl (Fmoc) protection; And amino acid carried out side chain protected: the Side chain protective group to Asp, Glu, Ser and Thr is the tertiary butyl; to Asn, Gln and His is trityl (Trt); to Lys and Trp is tertbutyloxycarbonyl (Boc); to Arg is 2; 2,5,7; 8 ,-5-methyl chroman-6-alkylsulfonyl (Pmc).With N, N-DIC/I-hydroxybenzotriazole makes the amino acid coupling successively of protection as activating reagent, each 40 minutes of coupling.(1: 1: 1v/v/v) under the situation of Cun Zaiing, peptide and trifluoroacetic acid (85%) be room temperature reaction 120 minutes, thereby cut down from the polymer upholder, removes protecting group simultaneously at 15% dithioglycol/dimethyl sulphide/phenylmethylether.Then use the anhydrous diethyl ether precipitation of peptides, repeatedly wash with anhydrous diethyl ether then, fully remove mercaptan.Precipitation in water/trimethyl carbinol (1: 1), lyophilize obtains thick peptide.Thick peptide in 30 minutes with the reverse hplc purifying, with 37-42% second fine/the 0.9%TFA gradient carries out.Elutriant concentrates, and freeze-drying obtains the white solid of purity 〉=97%.
The process for gene engineering production of Exendin 4 variant polypeptides
1), following 4 gene fragments (lottery industry biotech firm) of chemosynthesis:
(1)5’AAT TCC AGA TCT ATG CGT CAC GGC GAA GGC ACC TACACC AGC CAT CTG AGC AAA CAG；
(2)5’ATG GAA GAA GAA GCG GTT AAA CTG TTC ATC GAA TGGCTG AAA AAC GGC GGC CCG CGT GGA TCC TAG；
(3)5’TCG CTA GGA TCC ACG CGG GCC GCC GTT TTT CAG CCATTC GAT GAA CAG TTT AAC CGC TTC TTC T；
(4)5’TC CAT CTG TTT GCT CAG ATC GCT GGT GAT GGT GCCTTC GCC GTG ACG CAT AGA TCT GG。
2), connect gene fragment:
With four synthetic gene fragment (A
260nm=2) respectively add water 50 μ l in (1), (2), (3), (4), get each 2 μ l of (1), (4) and be mixed in the test tube, another adds (2), (3) each 2 μ l mix.Add 10X polynueleotide kinase damping fluid 1 μ l, ATP (0.1mol/L) 1 μ l and T4 phage polynueleotide kinase 1 μ l, 37 ℃ the insulation 30 minutes, then in water-bath 95 ℃ kept 5 minutes.Reduce to room temperature,, add 10X ligase enzyme damping fluid 2 μ l, ATP (0.1mol/L) 1 μ l and T4 ligase enzyme 2 μ l the contents mixed of two test tubes.Kept 12 hours in 16 ℃.Use DNA separating kit (lottery industry biotech firm, promega company) to separate the fragment that connects then, dna fragmentation carries out the electrophoresis detection checking then with EcoRI, SalI double digestion then.
3), clone:
Get plasmid pUC18 (lottery industry biotech firm) 1 μ g, add 10X restriction endonuclease damping fluid 1 μ l, add each 1 μ l of EcoRI, SalI.Kept 30 minutes for 37 ℃, handle with chloroform-phenol reagent, the centrifuging and taking water layer again with the chloroform washing once, centrifugally adds 60% isopropanol precipitating after removing chloroform, and is centrifugal, drying for standby.With step 2) in the EcoRI, the dna fragmentation of SalI double digestion that obtain join in the plasmid of above-mentioned double digestion, add 10X ligase enzyme damping fluid 1 μ l, ATP 1 μ l and T4 ligase enzyme 2 μ l, kept 12 hours in 16 ℃.E coli JM 109 is prepared competent cell according to a conventional method, the sample of above-mentioned connection is transformed picking positive colony, extracting plasmid.
4), polyphone:
The clone that step 3) is obtained the plasmid of variant polypeptide gene through Bgl II+Sal I double enzymolysis, extract the DNA gene fragment that contains variant polypeptide.The plasmid BamHI+SalI double enzymolysis that step 3) is obtained is connected with the DNA gene fragment that contains variant polypeptide then in addition, must contain two segmental plasmids of variant polypeptide tandem gene.Continuation will contain the plasmid process Bgl II+Sal I double digestion of the variant polypeptide gene fragment of two polyphones, get the fragments of 2 gene polyphones, the plasmid that contains two tandem genes is connected to form the plasmid of 4 genes polyphones again with these 2 placed in-line fragments of gene behind BamHI+Sal I double digestion.So continuation can get 8 tandem genes or 16,32 placed in-line plasmids of gene.
5), transform:
The plasmid of clone's variant polypeptide is mixed with competence E coli JM 109 in ice bath, kept in ice bath 30 minutes, move in 42 ℃ of water-baths maintenance 2 minutes, cool off in the ice bath, (contain 1% agarose, 50 μ g penbritins/ml), 37 ℃ are spent the night coated plate.Picking colony goes to the LB nutrient solution and shakes in the bottle and (to contain that 50 μ g penbritins/ml), 37 ℃ of shaking culture are spent the night.Get nutrient solution 0.7ml and add 50% glycerine (aseptic) 0.3ml, fully mixed containing, the guarantor is in-85 ℃ of refrigerators standby.
6), the technology of fermentative production variant polypeptide
Fermentation manufacturing technique as shown in Figure 1.
At first, LB nutrient solution 1000ml (peptone 10g, yeast powder 5g, NaCl 10g) in 120 ℃ of sterilization 30 minutes, back penbritin (ultimate density reaches 100 μ g/ml), the inoculation step 5 of adding of cooling) the glycerine pipe 1ml of the storage that obtains, 37 ℃ of shaking culture are spent the night.The centrifugal collection thalline of 5000rpm, low temperature-35 ℃ freeze, and after the thawing, add the 6M Guanidinium hydrochloride, and homogenate extracts tandem polypeptide, the centrifugal collection supernatant liquor of 18000rpm.With this supernatant liquor with damping fluid (10mM pH 7.2 phosphoric acid buffers, 0.1% mercaptoethanol) dialysis renaturation.The centrifugation tandem polypeptide.(Nature 1980 to press the method for J.D.Baxter etc. then
285456-461) carry out cracking, it is soluble in water to be about to tandem polypeptide, adds Na
2CO
3Powder is kept PH8.5, drips citraconic anhydride inclusion body (Inclusion Body) is dissolved fully, keeps pH8.5, and room temperature continues to stir 2 hours, then, adds trypsinase and protaminase.37 ℃ kept 2 hours, got polypeptide, added 3N hydrochloric acid then and transferred to pH 3, stirred 4 hours, sloughed the citraconic acid protecting group, and whole process is monitored with HPLC, got Exendin of the present invention 4 polypeptide fragments of purifying at last.
The lasting hypoglycemic activity of Exendin 4 polypeptide fragments
Get the KK type ii diabetes mouse (Chinese Academy of Sciences's Shanghai animal center) of body weight 50g, fasting 2 hours is divided into four groups, and two groups of injection Exendin4 inject Exendin4 polypeptide fragment of the present invention (abbreviation E for two groups in addition
4(f)) each 2 μ g in 0,30 minute, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, got respectively behind the 20 μ l blood to measure with blood sugar detection test kit (available from Shanghai Vaccine and Serum Institute) and continue hypoglycemic activity in 6 hours.The result as shown in Figure 2.
Get the db/db type ii diabetes mouse (available from Chinese Academy of Sciences's Shanghai animal center and Yangzhou University) of body weight 50g, fasting 2 hours, subcutaneous injection Exendin 4 polypeptide fragments 2 μ g, respectively at 0,30, respectively got blood 20 μ l in 60,120 minutes, measure lasting blood sugar decreasing effect with blood sugar detection test kit (available from Shanghai Vaccine and Serum Institute).The result as shown in Figure 3.
Get the Goto Kokizaki diabetes rat (available from Chinese Academy of Sciences's Shanghai animal center) of the body weight 470g at 5 monthly ages, fasting 2 hours, abdominal injection 20% glucose 1ml, subcutaneous injection Exendin 4 polypeptide fragments 5 μ g, a control group injectable dextrose monohydrate.Respectively at 0,30,60,120, minute respectively get blood 20 μ l, measure its anti-after the meal sugar with blood sugar detection test kit (available from Shanghai Vaccine and Serum Institute).The result as shown in Figure 4, the blood sugar of having injected the administration group of Exendin 4 polypeptide fragments maintains on the lower level all the time, significantly is different from the control group that does not have administration.Curve 1 expression blank group, curve 2 expression administration groups.
Get 8 the week age body weight 20g small white mouse, be divided into five groups, by tail vein injection tetraoxypyrimidine (16mg/ml) 0.1ml, after 48 hours, subcutaneous injection Exendin 4 variant polypeptide fragments 2 μ g are respectively at 0,30, respectively got blood 20 μ l in 60,120 minutes, measure hypoglycemic activity with blood sugar detection test kit (available from Shanghai Vaccine and Serum Institute).Five groups have all shown good blood sugar decreasing effect, and the result as shown in Figure 5.
Get the Goto Kokizaki II rat of 6 monthly ages, body weight 470g, subcutaneous injection Exendin 4 polypeptide fragments 5 μ g, a control group injecting normal saline is in 0,3,5,10,15,30, got blood 20 μ l in 45 minutes, use ELISA test kit (DianosticSystemlab.Imc. (U.S.A)) and measure insulinotropic secretion.The result has injected the insulin secretion effect that the administration group of Exendin 4 polypeptide fragments has been recovered first phase as shown in Figure 6.
Claims (10)
1. the polypeptide and pharmacy acceptable salt or the ester that have formula (I) structure:
HGEGTX
1TSDLSKQX
2EEEAVKLFIEWLKNGX
4PX
5 (I)
Wherein,
X
1Expression Phe or Tyr,
X
2Expression Met, Ile or Leu,
X
4Expression Gly or disappearance,
X
5Expression Arg or disappearance.
2. polypeptide as claimed in claim 1, wherein said X
1Be Tyr.
3. polypeptide as claimed in claim 1, wherein said X
2Be Met.
4. polypeptide as claimed in claim 1, wherein said X
4Lack.
5. polypeptide as claimed in claim 1, wherein said X
1Be Tyr, X
2Be Met, X
4Disappearance, X
5Be Arg or disappearance.
6. pharmaceutical composition, it contains just like each described polypeptide among the claim 1-5.
7. pharmaceutical composition as claimed in claim 6, it also contains pharmaceutically acceptable thinner, vehicle or carrier.
8. pharmaceutical composition as claimed in claim 7, wherein said carrier are one or more in ethanol, the G ﹠ W.
9. as the purposes of each described polypeptide among the claim 1-5 in the medicine of preparation treatment diabetes.
10. purposes as claimed in claim 9, wherein diabetes are II-type diabetes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100084196A CN101280009A (en) | 2005-06-29 | 2005-06-29 | Exendin4 polypeptide fragments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100084196A CN101280009A (en) | 2005-06-29 | 2005-06-29 | Exendin4 polypeptide fragments |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100408238A Division CN100429227C (en) | 2005-06-29 | 2005-06-29 | Exendin 4 polypeptide segment |
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| Publication Number | Publication Date |
|---|---|
| CN101280009A true CN101280009A (en) | 2008-10-08 |
Family
ID=40012697
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103613657A (en) * | 2013-11-28 | 2014-03-05 | 孙玉琨 | Exendin4 with shortened peptide chain and genetic engineering application thereof |
| CN103981243A (en) * | 2013-02-07 | 2014-08-13 | 华凌科技有限公司 | Preparation method of insulin |
| CN103981242A (en) * | 2013-02-07 | 2014-08-13 | 华凌科技有限公司 | Preparation method of insulin |
| CN112094336A (en) * | 2020-07-03 | 2020-12-18 | 成都圣诺生物制药有限公司 | Preparation method of Avexitide |
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2005
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103981243A (en) * | 2013-02-07 | 2014-08-13 | 华凌科技有限公司 | Preparation method of insulin |
| CN103981242A (en) * | 2013-02-07 | 2014-08-13 | 华凌科技有限公司 | Preparation method of insulin |
| CN103613657A (en) * | 2013-11-28 | 2014-03-05 | 孙玉琨 | Exendin4 with shortened peptide chain and genetic engineering application thereof |
| CN103613657B (en) * | 2013-11-28 | 2016-01-13 | 孙玉琨 | Shorten Exendin4 and the genetically engineered application thereof of peptide chain |
| CN112094336A (en) * | 2020-07-03 | 2020-12-18 | 成都圣诺生物制药有限公司 | Preparation method of Avexitide |
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