WO2012142930A1 - 抗脂肪酸合成酶多肽及其应用 - Google Patents
抗脂肪酸合成酶多肽及其应用 Download PDFInfo
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- WO2012142930A1 WO2012142930A1 PCT/CN2012/074107 CN2012074107W WO2012142930A1 WO 2012142930 A1 WO2012142930 A1 WO 2012142930A1 CN 2012074107 W CN2012074107 W CN 2012074107W WO 2012142930 A1 WO2012142930 A1 WO 2012142930A1
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- amino acid
- polypeptide
- acid sequence
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K7/00—Peptides having 5 to 20 amino acids in a fully defined sequence; Derivatives thereof
- C07K7/04—Linear peptides containing only normal peptide links
- C07K7/08—Linear peptides containing only normal peptide links having 12 to 20 amino acids
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
- A61P1/16—Drugs for disorders of the alimentary tract or the digestive system for liver or gallbladder disorders, e.g. hepatoprotective agents, cholagogues, litholytics
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P3/00—Drugs for disorders of the metabolism
- A61P3/04—Anorexiants; Antiobesity agents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/10—Transferases (2.)
- C12N9/1025—Acyltransferases (2.3)
- C12N9/1029—Acyltransferases (2.3) transferring groups other than amino-acyl groups (2.3.1)
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y203/00—Acyltransferases (2.3)
- C12Y203/01—Acyltransferases (2.3) transferring groups other than amino-acyl groups (2.3.1)
- C12Y203/01085—Fatty-acid synthase (2.3.1.85)
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
Definitions
- the present invention relates to the field of polypeptide drugs, and in particular to polypeptides of fatty acid synthase and polynucleotides encoding the polypeptides, and to their use. Background technique
- Fatty acid syntheses are key enzymes in the biosynthesis of endogenous fatty acids. They produce long-chain fatty acids by catalyzing acetyl-CoA and malonyl-CoA.
- FAS includes acetyltransferase (AT), malonyltransferase (MT), ⁇ -ketoacyl synthase (KS), ⁇ -ketoacyl reductase (KR), ⁇ -hydroxyacyl dehydratase (HD) ), 7 functional domains such as enoyl reductase (ER) and thioesterase ( ⁇ ).
- FAS is closely related to obesity and has a higher expression in adipose tissue.
- FAS even has higher expression in human liver.
- the fatty acid synthesis ability of liver is 8 ⁇ 9 times higher than that of adipose tissue. Therefore, FAS is also closely related to the formation of fatty liver.
- Fatty liver refers to a lesion with excessive accumulation of fat in liver cells due to various reasons.
- traditional theory suggests that fatty acid anabolism is only an energy synthesis storage pathway, but a large number of studies have shown that FAS expression levels in tumor tissues such as breast cancer, liver cancer, prostate cancer, ovarian cancer, colorectal cancer and endometrial cancer. It is much higher than normal tissue, and inhibiting the activity of FAS in the above tumor tissue can significantly inhibit tumor growth. Therefore, FAS is also becoming a new target for the treatment of these diseases.
- FAS inhibitors are of great significance for inhibiting the biosynthesis of endogenous fatty acids, thereby effectively controlling the occurrence and development of diseases such as tumors, fatty liver, obesity and various related metabolic syndromes.
- FAS specific small molecule inhibitors can reduce FAS, thereby reducing fatty acid synthesis. Due to the blocked fatty acid synthesis, the concentration of the substrate malonyl-CoA is increased, which can directly act on the feeding center of the hypothalamus, inhibiting the secretion of neuropeptide Y which promotes feeding, thereby leading to eating inhibition.
- FAS inhibitors can improve non-insulin-dependent diabetes, reduce the symptoms of hypertension, coronary embolism and other obesity complications, and reduce their incidence.
- the present invention relates to a polypeptide of fatty acid synthase (FAS) which has an effect of inhibiting FAS transcription and expression, thereby inhibiting the expression of FAS in vitro and in vivo.
- FOS fatty acid synthase
- the polypeptide and its peptidomimetics, including functional fragments and functional variants thereof, and genes encoding these polypeptides, peptidomimetics or functional fragments thereof, functional variants are widely used for the prevention and treatment of tumors, fatty livers And the occurrence and development of obesity, including inhibition of the growth and development of liver cancer cells.
- the invention provides an isolated polypeptide or peptidomimetic comprising the amino acid sequence set forth in SEQ ID NO: 1, or a functional fragment or a functional variant thereof, the polypeptide or peptidomimetic having inhibition of FAS transcription and The expressed function can be widely used to prevent and treat the occurrence and development of tumor, fatty liver and obesity, including inhibiting the occurrence and development of liver cancer.
- the polypeptide or peptidomimetic described above may comprise at least 80%, or 90%, or 95%, and even higher identity to the amino acid sequence set forth in SEQ ID NO: 1. Amino acid sequence.
- the polypeptide or peptidomimetic comprises one or more amino acids added or deleted in the middle or the flank of the amino acid sequence set forth in SEQ ID NO: 1, or one of its sequences Or an amino acid sequence obtained by substituting a plurality of amino acid residues. More preferably, these polypeptides or peptidomimetics comprise an amino acid obtained by adding or deleting an amino acid on the terminal side of the amino acid sequence shown as SEQ ID NO: 1, or conserving one amino acid residue in its amino acid sequence. The amino acid sequence obtained after the substitution. More preferably, these polypeptides or peptidomimetics comprise any of the amino acid sequences set forth in SEQ ID NOs: 1-6.
- the invention provides an isolated polynucleotide comprising a polynucleotide encoding an amino acid sequence set forth in SEQ ID NO: 1, a functional fragment or a functional variant thereof; or comprising and encoding as SEQ ID NO: A polynucleotide in which the amino acid sequence shown by 1, a functional fragment or a functional variant thereof is complementary or strictly hybridized.
- the functional fragment or functional variant of the amino acid sequence set forth in SEQ ID NO: 1 is contained in, e.
- amino acid sequence in which one or several amino acids are added or deleted in the middle or the terminal side of the amino acid sequence shown by 1, or one or several amino acid residues in the sequence are substituted.
- the functional fragment or functional variant of the amino acid sequence set forth in SEQ ID NO: 1 comprises the addition or deletion of an amino acid at the middle or the terminal side of the amino acid sequence set forth in SEQ ID NO: 1.
- the present invention provides a recombinant expression vector comprising an exogenous polynucleotide comprising the above polynucleotide encoding the amino acid sequence set forth in SEQ ID NO: 1, a functional fragment or a functional variant thereof; or The above polynucleotide encoding a complementary or strictly hybridizing polynucleotide of the amino acid sequence shown in SEQ ID NO: 1, a functional fragment or a functional variant thereof.
- the present invention also provides the use of the above polypeptide or peptide mimetic, nucleotide and recombinant expression vector for the manufacture of a medicament for the prevention and treatment of tumors, fatty liver and obesity.
- the medicament is applicable to inhibit the growth of liver cancer cells in vitro and in vivo, and thus can be applied to the prevention and treatment of liver cancer.
- the medicament may also comprise a pharmaceutical composition, which may comprise an optional pharmaceutical carrier.
- the polypeptide and its peptidomimetic, including functional fragments and functional variants thereof, as an effective inhibitor of FAS have a function of inhibiting transcription and expression of FAS, thereby being useful for preventing and treating tumors.
- Figure 2 Application of reporter gene assay The effect of the polypeptide gene plasmid of the present invention on the SREBP-lc and FAS promoters in liver cancer cells.
- the results showed that -Anti-FAS-P18 inhibited the activity of SREBP-lc and FAS promoters in HepG2 cells, and the inhibition was dose-dependent, indicating that the polypeptide gene expression product of the present invention inhibits the transcriptional expression of FAS gene. effect.
- Figure 3 Effect of detecting the polypeptides of the present invention and their variants on the activity of SREBP-lc and FAS promoters in HepG2 cells at the cellular level.
- the results showed that the artificially synthesized polypeptide Anti-FAS-P18 inhibited the activity of SREBP-lc and FAS promoter in hepatocellular carcinoma HepG2 cells in a dose-dependent manner, indicating that the polypeptide of the present invention inhibits the transcriptional activity of FAS gene.
- the role The 100 ⁇ of the polypeptide of the present invention, Anti-FAS-P18 variant P18-1 to P18-5, also inhibited the activity of the SREBP-lc and FAS promoters to varying degrees. * P ⁇ 0.05, ** P ⁇ 0.01, Student's t test statistical analysis.
- Figure 4 Effect of the polypeptide gene plasmid of the present invention on the expression level of FAS protein in liver cancer cells by immunoblotting. The results showed that p-Anti-FAS-P18 inhibited the expression of FAS protein in HepG2 cells in a dose-dependent manner.
- FIG. 5 Effect of the polypeptide of the present invention on the expression level of FAS protein in liver cancer cells by immunoblotting. The results showed that the synthetic peptide Anti-FAS-P18 inhibited the expression of FAS protein in HepG2 cells in a dose-dependent manner.
- Figure 7 Application of reporter gene detection of polypeptides of the invention and variants thereof in liver cancer cells The effect of the NF- ⁇ promoter. The results showed that Anti-FAS-P18 inhibited the activity of NF-KB promoter in HepG2 cells, and the inhibition was dose-dependent, indicating that the proliferation ability of liver cancer cells decreased. The 100 ⁇ variant of the polypeptide of the present invention, Anti-FAS-P18, P18-1 to P18-5, also inhibited the activity of NF-KB to varying degrees. *P ⁇ 0.05, **P ⁇ 0.01, Student's t test statistical analysis.
- Figure 8 Effect of the polypeptide gene plasmid of the present invention on proliferation of liver cancer cells using MTT. The results showed that p-Anti-FAS-P18 inhibited the proliferation of HepG2 cells in a dose-dependent manner. * P ⁇ 0.05, ** P ⁇ 0.01, Student's t test statistical analysis.
- Figure 9 The effect of the polypeptides of the invention and their variants on the proliferation of hepatoma cells at the cellular level using MTT assay.
- the results showed that the synthetic polypeptide Anti-FAS-P18 inhibited the proliferation of HepG2 cells in a dose-dependent manner.
- 100 ⁇ of the polypeptide of the invention Anti-FAS-P18 variant P18-1 to P18-5 also inhibited the proliferation of HepG2 cells in different degrees.
- Figure 10 Effect of synthetic peptide Anti-FAS-P18 on HepG2 cells.
- the results of inoculation experiments in nude mice showed that the artificially synthesized polypeptide Anti-FAS-P18 of the present invention had a significant inhibitory effect on the growth and proliferation of HepG2 cells. ** P ⁇ 0.01, Student's t test statistical analysis
- Figure 11 Effect of synthetic peptide Anti-FAS-P18 (P18) on body weight of nude mice.
- the artificially synthesized peptide Anti-FAS-P18 had no significant effect on the body weight of nude mice.
- Figure 12 Schematic diagram of construction of a polypeptide eukaryotic expression vector
- the term "separated” refers to the separation of a substance from its original environment (for example, if it is naturally produced, its natural environment).
- a naturally occurring polynucleotide or polypeptide is present in a living animal and is not isolated, but the same polynucleotide or more Peptides are separated from some or all of the substances that coexist in the natural system.
- Such polynucleotides or polypeptides may be part of a vector or part of a composition. Since the carriers and compositions are not components of their natural environment, they are still isolated.
- purified means that it has been improved in purity.
- Purity is a relative term in this and is unnecessarily interpreted as absolute purity.
- the purity can be at least about 50%, or can be greater than 60%, 70%, 80%, 90%, or can be 100%.
- the separated material is separated from its original environment. Polynucleotides and polypeptides in the natural state of living cells are not isolated, but the same polynucleotides and polypeptides are separated, if separated from other substances present in the natural state, and the purity is improved. It is therefore purified.
- Nucleic acid refers to a nucleotide, oligonucleotide or polynucleotide and fragments or portions thereof.
- the nucleic acid of the present invention can exist in the form of RNA (e.g., mRNA), or in the form of DNA (e.g., cDNA or genomic DNA).
- the DNA may be double-stranded or single-stranded.
- the single-stranded DNA or RNA may be either a coding strand (sense strand) or a non-coding strand (antisense strand).
- polynucleotide of the present invention may also be fused at its 5' or 3' end to a polynucleotide encoding a tag tag (tag sequence or tag sequence).
- tag tag tag sequence or tag sequence
- They may be synthetic or obtained from natural sources (eg, isolated and/or purified), which may comprise natural, non-natural or modified nucleotides, and which may comprise natural, non-natural or altered
- a bond between nucleotides, such as a phosphoramidate linkage or a phosphorothioate linkage, is used in place of the phosphodiester linkage present between the nucleotides in the unmodified oligonucleotide.
- amino acid sequence refers to a peptide, an oligopeptide, a polypeptide or a protein and a partial fragment thereof, and an amino acid linked by a peptide bond therebetween.
- amino acid sequence in the present invention relates to the amino acid sequence of a naturally occurring protein molecule, such "polypeptide” or “protein” is not meant to limit the amino acid sequence to the protein molecule.
- the amino acid sequences of the invention may contain additional peptides. As an additional peptide, a peptide such as a histidine tag (His-tag) or an epitope such as Myc or FLAG is exemplified.
- “Deletion” refers to the deletion of one or more amino acids or nucleotides in an amino acid sequence or nucleotide sequence.
- “Insertion” or “addition” refers to an increase in one or more amino acids or nucleotides as compared to a molecule that is naturally occurring or altered prior to alteration in an amino acid sequence or nucleotide sequence.
- Replacement refers to the replacement of one or more amino acids or nucleotides by a different amino acid or nucleotide.
- “Deleting, replacing or adding one or more amino acids or nucleotides” means deleting, replacing or adding one or more amino acids or nucleotides by a method for producing a known mutant nucleic acid or polypeptide such as site-directed mutagenesis.
- the above mutations of naturally occurring nucleic acids or polypeptides are isolated and purified.
- the amino acid mutation may comprise an amino acid having one or more amino acid residues in a D-type conformation, a rare amino acid present in nature, or an artificially modified amino acid, which may or may not be encoded by a genetic code.
- mutations in the induced nucleic acid may include naturally occurring nucleotides in nature, and may also include modified nucleotides.
- a “functional fragment” of a polypeptide refers to any portion of the polypeptide that retains substantially similar or identical biological activities and functions of the polypeptide (i.e., "parent” polypeptide) as part of it.
- a “functional variant” of a polypeptide refers to an amino acid sequence that substantially retains a biological function or activity that is identical or similar to the polypeptide or amino acid sequence, and which may include, for example, 1) one or more amino acid residues in the original amino acid sequence.
- a deletion and/or one or more amino acid residues are added; or 2) one or more amino acid residues in the original amino acid sequence are replaced by conservative or non-conservative amino acid residues; or 3) one or more of the original amino acid sequences Ammonia a group on the acid residue is substituted by another group; or 4) a fusion of the original amino acid sequence with another molecule or compound (such as sugar, lipid, polyethylene glycol, etc.); or 5) the original a polypeptide sequence obtained by fusing an amino acid sequence with an added amino acid sequence (such as a leader sequence or a secretory sequence or a sequence for purifying the polypeptide, etc.); or 6) a reverse amino acid sequence of the original amino acid sequence; or 7) mixing.
- a functional variant of the amino acid sequence may comprise an amino acid having one or more amino acid residue conformations as a D-type, a rare amino acid present in nature or an artificially modified amino acid, which may or may not be derived from the genetic code. Subcoded.
- a "reverse analog" of a polypeptide refers to a polypeptide comprising an inverted amino acid sequence of the parent polypeptide such that the amino acid sequence of the inverse analog (when read from the N-terminus to the C-terminus) and when reading from the C-terminus to the N-terminus
- the amino acid sequence of the parent polypeptide in time is the same; in addition, each amino acid in the reverse analog is the D isomer of the amino acid, and the D isomer is opposite to the L isomer.
- the inverse analog of the tripeptide Val-Ala-Gly has the amino acid sequence Gly-Ala-Val, wherein each amino acid is the D isomer.
- peptidomimetic refers to a compound having substantially the same general structure as the corresponding polypeptide and having, for example, a modification capable of increasing its stability or biological function.
- Peptidomimetics include, for example, those compounds that comprise the same amino acid sequence as the corresponding polypeptide, but between two or more of these amino acids, the peptidomimetic has an altered backbone.
- the peptidomimetic can include synthetic or non-naturally occurring amino acids in place of naturally occurring amino acids.
- a "degenerate variant" of a nucleotide sequence is a polynucleotide sequence which differs from the parent nucleotide sequence but which encodes a protein or polypeptide and a protein encoded by the parent nucleotide sequence or The same as the peptide.
- nucleic acid hybridization is well known in the art (see, for example, Sambrook et al, Molecular Cloning: A Laboratory Manual, 3rd Ed., Cold Spring Harbor Laboratory, 2001). Generally, the higher the temperature, the lower the salt concentration, the higher the stringency (it is difficult to mix Cross) so that more identical polynucleotides can be obtained.
- a suitable hybridization temperature varies depending on the length of the base sequence or its base sequence.
- the invention also relates to hybridization under "stringent conditions".
- stringent conditions refer to hybridization and elution at lower ionic strengths and higher temperatures. For example, at 42 ° C, in a hybridization solution (containing 50% formamide, 5 X SSC (150 mM sodium chloride + 15 mM trisodium citrate), 50 mM sodium phosphate (pH 7.6),
- “Homology” refers to the degree of complementarity, either partial homology or complete homology.
- "Partial homology” refers to a partially complementary sequence that partially inhibits the hybridization of a fully complementary sequence to a target nucleic acid. This inhibition can be detected by hybridization (Southern blot or Northern blot, etc.) under conditions of reduced stringency.
- Substantially homologous sequences or hybridization probes can compete for and inhibit the binding of a fully complementary sequence to a target sequence under conditions of reduced stringency. Of course, the condition of reduced stringency does not allow for non-specific binding, and the two sequences bind to each other and still require specific or selective interactions.
- identity or “identity” percentage of an amino acid sequence or nucleotide sequence refers to the percentage of sequences that are identical or similar in the comparison of two or more amino acid or nucleotide sequences. There are a number of methods well known to those skilled in the art to determine percent identity, such as by the MEGALIGN program (DNAgene software package, DNASTA, Inc., Madison,
- the MEGALIGN program can compare two or more sequences according to different methods such as the Cluster method (see Higgins & Sharp, Gene 73:237-244, (1988)).
- the Cluster method examines the sequence of each pair by examining the distance between all pairs. Arrange into clusters and then assign the clusters in pairs or groups.
- the percent identity between two amino acid sequences, such as sequence A and sequence B, can be calculated by:
- nucleic acid sequence is determined by the Gluster method or other methods known in the art (see Hein J., Methods in Emzumology 183: 625-645, 1990) Percentage of sex.
- Recombinant expression vector refers to a genetically modified oligonucleotide or polynucleotide recombinant having a nucleotide sequence encoding an mRNA, a protein, a polypeptide, or a peptide, which can be introduced into a host cell. Expression of the corresponding mRNA, protein, polypeptide, or peptide.
- the recombinant expression vector may comprise any type of nucleotide sequence, but is not limited to DNA or RNA, may be single-stranded or double-stranded, artificially synthesized or derived from nature, or may be non-natural or altered nucleoside. acid.
- the bond between the nucleotides may be naturally occurring or non-naturally occurring or modified.
- "treating” and “preventing” and the terms derived therefrom are not meant to be 100% or complete treatment or prevention and may be considered to be a degree of treatment or prevention recognized by those skilled in the art.
- "Prophylaxis” in the present invention is understood to delay the onset of a disease, or a symptom or condition thereof.
- the present invention relates to an isolated or purified polypeptide which may comprise, consist essentially of, or consist of the amino acid sequence Gly-Gly-Cys-Arg-His-Lys-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys- A polypeptide consisting of Asn-Phe-Ph e-Thr (SEQ ID NO: 1).
- the expression of FAS gene is regulated by its upstream regulatory factor sterol regulatory element binding protein lc (SERBP-lc).
- SERBP-lc upstream regulatory factor sterol regulatory element binding protein lc
- the polypeptide of the present invention can inhibit the transcription and expression of FAS by inhibiting the transcription of SERBP-lc, and thus can be used for the prevention and treatment of the occurrence and development of tumors, fatty liver and obesity, including inhibition of the occurrence of liver cancer cells and development of.
- the inhibition is manifested at the molecular level, at the cellular level, and at the animal level.
- the polypeptide inhibits the activity of the SREBP-lc and FAS promoters at the molecular level, and down-regulates the expression level of the FAS protein, thereby constituting an effective inhibition of FAS, and the inhibitory effect thereof is in a dose-effect relationship; the above-mentioned inhibition of the polypeptide Also manifested at the cellular level, such as the polypeptide can inhibit the growth and proliferation of tumor cells in vitro by the action of anti-FAS, and the inhibitory effect thereof is also in a dose-effect relationship; the inoculation method by nude mice shows that the polypeptide is also at the animal level.
- the invention also provides various functional fragments of the polypeptides of the invention.
- the functional fragment may be any fragment of a contiguous amino acid sequence of a polypeptide of the invention, provided that it retains the biological activity of the parent polypeptide to a similar extent, to the same extent, or to a greater extent than the parent polypeptide, for example, to inhibit FAS transcription and Expressed activity.
- the functional fragment may have, for example, about 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 100%, 105% of the parent polypeptide.
- a functional fragment of a polypeptide of the invention preferably comprises an amino acid sequence having at least 70% sequence identity to the parent polypeptide.
- functional variants of the polypeptides of the invention and functional fragments thereof are also included within the scope of the invention.
- the functional variants of the polypeptides of the invention and functional fragments thereof retain substantially similar, identical, and even enhanced biological activity to the parent polypeptide or parental functional fragment, for example, inhibiting transcription and expression of FAS, and effectively inhibiting tumor cells Growth and proliferation.
- the functional variant may be at least about 50%, 60%, 70%, 80%, 90%, 95% or 100 with the amino acid sequence of the parent polypeptide or a functional fragment thereof. % identity.
- a functional variant of a polypeptide of the invention and a functional fragment thereof has at least 80%, or 90%, or 95%, or even higher sequence identity to the parent polypeptide or a functional fragment thereof.
- the functional variants of the polypeptides and functional fragments thereof of the invention differ from the parent polypeptide and its functional fragments by only one or several amino acids.
- a functional variant of a polypeptide of the invention and a functional fragment thereof differs from the parent polypeptide or a parental functional fragment by only one amino acid.
- Functional variants of the polypeptides of the invention and functional fragments thereof may comprise a parent polypeptide Or the amino acid sequence obtained by displacement of the parent functional fragment amino acid.
- they may comprise a parent polypeptide or a parental functional fragment amino acid sequence having at least one conservative amino acid substitution.
- the functional variants of the polypeptides of the invention and functional fragments thereof may comprise a parent polypeptide or a parental functional fragment having one, two, three, four, five, or more conservative amino acid substitutions. Amino acid sequence.
- the functional variants of the polypeptides of the invention and functional fragments thereof may also comprise an amino acid sequence of a parent polypeptide or a parental functional fragment having at least one non-conservative amino acid substitution.
- an amino acid sequence of a parent polypeptide or a parental functional fragment having 1, 2, 3, 4, 5, or more non-conservative amino acid substitutions can be included.
- the amino acid substitution increases the biological function or activity of a functional variant of a polypeptide of the invention and a functional fragment thereof such that when compared to the parent polypeptide or a parental functional fragment, the functional variant organism Increased learning function or activity.
- functional variants of the polypeptides of the invention and functional fragments thereof include one or several conservative amino acid substitutions.
- Conservative amino acid substitutions are well known in the art and refer to such amino acid substitutions, SP, in which one amino acid having a certain physical and/or chemical property is exchanged for another amino acid having the same chemical or physical properties.
- SP amino acid substitutions
- conservative amino acid substitutions may not result in significant changes in the structure or function of the protein.
- Typical conservative substitutions include, for example, replacing another acidic amino acid (such as Asp or Glu) with an acidic amino acid, and replacing another amino acid having a non-polar side chain with an amino acid having a non-polar side chain (eg, Ala, Gly, Val, lie, Leu, Met, Phe, Pro, Trp, Val, etc.), replacing another basic amino acid with a basic amino acid (Lys, Arg, etc.), replacing another polar side with an amino acid with a polar side chain
- the amino acids of the chain (Asn, Cys, Gln, Ser, Thr, Tyr, etc.) are replaced with aromatic amino acids (Trp, Phe, Tyr, etc.), and the like.
- the functional variants can also be obtained by adding and/or deleting one or more amino acids in the middle of the polypeptide and its functional fragments, at the amino or carboxy terminus thereof, and/or its amino and carboxy termini.
- the added or deleted amino acid does not interfere with the polypeptide or work
- the biological function and activity of the fragment for example, inhibits the transcription and expression of FAS, and effectively inhibits the growth and proliferation of tumor cells, including liver cancer cells.
- the additional amino acid is capable of causing enhanced biological activity when compared to the biological activity of the parent polypeptide.
- functional variants of the polypeptides of the invention and functional fragments thereof may also include retroinversion analogs of the polypeptides of the invention or functional fragments thereof.
- reverse analog refers to a polypeptide comprising an inverted amino acid sequence of a parent polypeptide such that the amino acid sequence of the inverse analog (when read from the N-terminus to the C-terminus) and when from the C-terminus to the N- The amino acid sequence of the parent polypeptide at the time of reading is the same. Further, regarding the reverse analog, each amino acid is the D isomer of the amino acid, and the D isomer is opposite to the L isomer. For example, the inverse analog of the tripeptide Val-Ala-Gly has the amino acid sequence Gly-Ala-Val, wherein each amino acid is the D isomer.
- the functional variant of such a molecule preferably comprises the inverse analog of SEQ ID NO: 1.
- a polypeptide, functional fragment or functional variant thereof of the invention may be of any length, ⁇ , may include any number of amino acids, provided that the polypeptide (including functional fragments) and functional variants thereof retain the necessary biological activity, For example, it inhibits transcription and expression of FAS, and effectively inhibits cancer cells, preferably liver cancer cells.
- a polypeptide of the invention can be from 4 to 2000 amino acids in length, such as 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 , 16, 18, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 125
- the polypeptide of the present invention is within 30 amino acids in length and is capable of meeting the pharmacodynamic and half-life requirements of the polypeptide drug.
- the polypeptides provided herein have
- the amino acid sequence shown by ID NO: 1 has one or several amino acid amino acid sequences, including, for example, one, two, three, four, five amino acid differences. These amino acid sequences may be, for example, by adding or deleting one or several amino acid residues at the terminal side or in the middle of SEQ ID NO: 1, or by replacing one or more amino acid residues in SEQ ID NO: 1. And other methods are obtained.
- the functional variant thus obtained has similarity to the parent polypeptide SEQ ID NO: 1 Biological activities and functions, for example, inhibit the transcription and expression of FAS, as well as effectively inhibit tumor cells, including liver cancer cells.
- these functional variants can be obtained by adding an amino acid to the terminal side of the parent polypeptide SEQ ID NO: 1, or conservatively replacing one of the amino acids of the parent polypeptide SEQ ID NO: 1.
- the polypeptide provided by the invention comprises any one of the amino acid sequences set forth in SEQ ID NOs: 1-6.
- the invention also provides mimetics of the polypeptides, including functional fragments and functional variants thereof.
- the peptidomimetic is a peptidomimetic.
- Peptidomimetics refers to peptide mimetics in which the side chain of each amino acid is attached to the nitrogen atom of the amino acid rather than to the alpha carbon.
- a peptidomimetic can be considered a purine-substituted glycine having a repeating unit of the general structure of NRCH2CO and having the same or substantially the same amino acid sequence as the corresponding polypeptide.
- the peptidomimetic comprises an altered backbone wherein the bond between each amino acid is methylated.
- the peptidomimetic can include a methylated peptide backbone of the structure:
- polypeptides of the invention may include the replacement of naturally occurring amino acids with synthetic amino acids.
- synthetic amino acids include, for example, aminocyclohexanecarboxylic acid, norleucine, a-amino-n-decanoic acid, homoserine, S-acetylaminomethyl-cysteine, Trans-3-hydroxyproline, trans-4-hydroxyproline, 4-aminophenylalanine, 4-benzoylphenylalanine, 4-nitrophenylalanine,
- polypeptides of the invention can also be, for example, lipidated (e.g., fatty acidated), glycosylated, amidated, carboxylated, phosphorylated, esterified, oxime-acylated. Cyclization by disulfide bonds, conversion to acid addition salts, dimerization or multimerization, and/or conjugation.
- lipidated e.g., fatty acidated
- glycosylated e.g., amidated, carboxylated, phosphorylated, esterified, oxime-acylated. Cyclization by disulfide bonds, conversion to acid addition salts, dimerization or multimerization, and/or conjugation.
- the polypeptides of the invention can be lipidated derivatives.
- the lipid molecules contained may include any lipid known in the art, such as fatty acids, phospholipid groups, glycosylphosphatidylinositol, phosphatidylserine, phosphatidylethanolamine, sphingomyelin, phosphatidylcholine, cardiolipin, phospholipid Acylsitol, phosphatidic acid, lysophosphoglyceride, and cholesterol groups.
- fatty acids such as fatty acids, phospholipid groups, glycosylphosphatidylinositol, phosphatidylserine, phosphatidylethanolamine, sphingomyelin, phosphatidylcholine, cardiolipin, phospholipid Acylsitol, phosphatidic acid, lysophosphoglyceride, and cholesterol groups.
- the lipidated derivative is a fatty acid derivative
- the fatty acid molecule may be any C8-C20 fatty acid such as lauric acid, palmitic acid, myristic acid, stearic acid, oleic acid, linoleic acid, linolenic acid. , arachidonic acid, eicosapentaenoic acid, erucic acid, or arachidic acid.
- the fatty acid may also optionally contain other functional groups, such as one or more amino groups, on any carbon atom.
- the fatty acid molecule can be attached to any of the appropriate portions of the polypeptides of the invention, including functional fragments and functional variants, as well as peptide mimetics.
- a fatty acid molecule is included at the amino terminus, the carboxy terminus, or both the amino and carboxy termini of the polypeptide of the present invention.
- the fatty acid molecules can be attached to the polypeptides of the invention (including functional fragments and functional variants) as well as to peptide mimetics, either directly or through a linker.
- Polypeptides (including functional fragments and functional variants) of the invention, as well as peptidomimetics, including derivatives thereof, such as fatty acid derivatives may also be monomeric peptides, dimeric peptides or multimeric peptides.
- Polypeptides of the invention can be obtained by methods known to those skilled in the art (see, for example, Chan et al, Fmoc Solid Phase Peptide Synthesis, Oxford University Press, Oxford, UK, 2005; Reid, R., Peptide and Protein Drug Analysis, Marcel Dekker Company, 2000; and U.S. Patent No. 5,449,752).
- the polypeptide can also be produced by a nucleic acid recombinant method. (See, for example, Sambrook et al., Molecular Cloning: A Laboratory Manual, 3rd ed., Cold Spring Harbor Press, Cold Spring Harbor, New York, 2001).
- polypeptides of the invention can be isolated and/or purified from, for example, plants, bacteria, insects, mammals such as rats, humans, and the like. Methods of separation and purification are also well known in the art.
- polypeptides described herein, including functional fragments thereof as well as functional variants can be purchased commercially from commercial companies.
- the invention also provides an isolated polynucleotide encoding any of the polypeptides of the invention, including functional fragments and functional variants thereof.
- the polynucleotide comprises a coding sequence for any of the polypeptides of the invention, including functional fragments and functional variants thereof.
- the invention provides a nucleotide sequence of SEQ ID NO: 1 encoding SEQ ID NO: 7, and any degenerate variant of these coding sequences; alternatively, the polynucleotide may further comprise additional coding sequences And/or non-coding sequences.
- the invention also provides polynucleotides encoding functional fragments or functional variants of the amino acid sequence set forth in SEQ ID NO: 1, which polynucleotides may also comprise additional coding sequences and/or non-coding sequences.
- the present invention provides an isolated polynucleotide or a fragment thereof, which comprises a nucleotide sequence which is complementary to a nucleotide sequence of any one of the aforementioned polynucleotides or which can hybridize under stringent conditions. .
- the invention also provides variants of the above polynucleotides which encode functional fragments or functional variants of polypeptides or polypeptides having the same amino acid sequence as the polypeptides of the invention, including functional fragments and functional variants.
- Variants of this polynucleotide may be naturally occurring allelic variants or non-naturally occurring variants. These nucleotide variants include substitution variants, deletion variants, and insertion variants.
- an allelic variant is an alternative form of a polynucleotide which may be a substitution, deletion or insertion of one or more nucleotides, but does not substantially alter the function of the polypeptide encoded thereby. .
- the polynucleotide of the present invention may be obtained by purification in a natural form, or may be produced by recombination, or may be based on chemical synthesis and/or enzymatic ligation, and has been used in the art. Constructed by knowing methods.
- the polynucleotide of the present invention may contain naturally occurring nucleotides, and may also contain modified nucleotides.
- the modified nucleotide is designed to increase the biological stability of the molecule or to increase the physical stability of the duplex formed upon hybridization (eg, a phosphorothioate derivative and an acridine-substituted nucleotide), including for example, 5-fluorouracil, 5-bromouracil, 5-chlorouracil, 5-iodouracil, hypoxanthine, xanthine, 4-acetylcytosine,
- nucleic acids of the invention are recombinantly produced.
- Recombinant expression vector 5-methoxyaminomethyl-2-thiouracil, uracil-5-glycolic acid, 5-methyl-2-thiouracil, 2-thiocytosine , 2-thiouracil, 4-thiouracil, 5-methyluracil, uracil-5-hydroxyacetic acid methyl ester, 3-(3-amino-3-N-2-carboxypropyl)uracil And 2,6-diaminopurine and the like.
- it may contain a bond between natural or altered nucleotides, such as a phosphoramidate linkage or a phosphorothioate linkage, in place of the naturally occurring phosphodiester linkage.
- the nucleic acids of the invention are recombinantly produced.
- Recombinant expression vector such as a phosphoramidate linkage or a phosphorothioate linkage
- the invention also provides a recombinant expression vector comprising any of the polynucleotides of the invention.
- the recombinant expression vector can be any suitable recombinant expression vector and can be used to transform or transfect any suitable host cell. Suitable vectors include those designed for propagation and amplification or for expression, or both, such as plasmids or viruses.
- the vector can be freely combined by the following: pUC series, pcDNA series, pBluescript, pET series, pGEX series and pEX series. It is also possible to use a phage vector such as GT10, GTI ⁇ EMBL4 or the like.
- Plant expression vectors can include pBIO1, pBI101.2, pBI101.3, pBI121 and pBIN19.
- Animal expression vectors can include pEUK-Cl, pMAM, and pMAMneo.
- the invention relates to a plasmid using the pcDNA series.
- the recombinant expression vector of the present invention can be prepared using standard recombinant DNA techniques.
- a circular or linear expression vector construct can be made to comprise a replication system that functions in a prokaryotic or eukaryotic host cell.
- the recombinant expression vector includes regulatory sequences, such as transcriptional and translational initiation and termination codons.
- the regulatory sequences are specific for the type of host (eg, bacteria, fungus, plant, or animal) into which the vector is introduced.
- the recombinant expression vector can include one or more marker genes that allow for selection Or transfected host. Marker genes include resistance to biocides such as resistance to antibiotics, heavy metals, and the like, complementation in auxotrophic hosts to provide prototrophy, and catalytic biofluorescence and the like. Suitable marker genes for the expression vector of the present invention include, for example, neomycin/G418 resistance gene, luciferase reporter gene, hygromycin resistance gene, histidine resistance gene, tetracycline resistance gene, and ampicillin resistance. Sex gene.
- the recombinant expression vector can include a native or non-native promoter.
- Promoter selection such as strong, weak, inducible, tissue-specific, and development-specific, is within the skill of the skilled artisan.
- the combination of a nucleotide sequence and a promoter is also within the skill of the skilled artisan.
- the promoter may be a non-viral promoter or a viral promoter, such as a cytomegalovirus (CMV) promoter, an SV40 promoter, an RSV promoter, and a promoter present in the long terminal repeat of the murine stem cell virus.
- CMV cytomegalovirus
- SV40 promoter SV40 promoter
- RSV promoter an RSV promoter
- the recombinant expression vectors of the invention can be designed for transient expression, for stable expression, or for both.
- the recombinant expression vector can be prepared for constitutive expression or for inducible expression.
- the recombinant expression vector can include a suicide gene.
- suicide gene refers to a gene that causes cell death after expression in a cell. Suicide gene expression can affect the sensitivity of cells to certain agents, such as drugs, leading to cell death. Suicide genes are known in the art (see, for example, Suicide Gene Therapy: Methods and Reviews), Springer, Caroline J. (Clinical Research)
- HSV herpes simplex virus
- TK thymidine kinase gene and purine nucleoside phosphatase, and nitro Reductase and the like.
- the invention also provides host cells comprising any of the recombinant expression vectors described herein.
- the host cell is any type of cell comprising a recombinant expression vector of the invention.
- the host cell may be a eukaryotic cell such as a plant, animal, fungus, or alga, or may be a prokaryotic cell such as a bacterium or a protozoan.
- the host cell can be a cultured cell or a primary cell, SP, a primary cell isolated directly from an organism such as a human.
- the host cell can be an adherent cell or Suspended cells, SP, cells grown in suspension. Suitable host cells are known in the art and include, for example, 0115schreib E.
- the host cell is preferably a prokaryotic cell.
- the host cell is preferably a mammalian cell for the purpose of producing a recombinantly modified polypeptide or protein.
- a human cell is a preferred host cell.
- the host cell can be of any cell type and can be of any type The tissue, and can be of any developmental stage.
- the invention also provides a population of cells comprising at least one host cell as described herein.
- the population of cells can be a heterogeneous population, including a host cell comprising any of the recombinant expression vectors.
- the population of cells may be a substantially homogeneous population, wherein the population primarily comprises a host cell comprising the recombinant expression vector (e.g., consisting essentially of a host cell comprising the recombinant expression vector).
- the population may also be a clonal population of cells, wherein all cells of the population are clones of a single host cell comprising a recombinant expression vector such that all cells of the population comprise the recombinant expression vector.
- the population of cells is a clonal population comprising a host cell comprising a recombinant expression vector as described herein.
- the invention also includes conjugates, such as bioconjugates, comprising a polypeptide of the invention (including functional fragments and functional variants thereof) as well as any of a peptidomimetic, polynucleotide, recombinant expression vector, or host cell.
- conjugates such as bioconjugates, comprising a polypeptide of the invention (including functional fragments and functional variants thereof) as well as any of a peptidomimetic, polynucleotide, recombinant expression vector, or host cell.
- Conjugates, as well as methods for the usual synthesis of conjugates are also known in the art (see, for example, Hudecz, F., Methods Mol. Biol. 298: 209-223 (2005) and Kirin. Et., Inorg. Chem. 44(15): 5405-5415 (2005)).
- compositions include polypeptides (including functional fragments and functional variants thereof) as well as peptidomimetics, fatty acid derivatives, polynucleotides, recombinant expression vectors, and host cells (including populations thereof), and conjugation
- the materials may be isolated, purified, synthesized, and/or recombinant.
- the substances of the invention may also be formulated into compositions such as pharmaceutical compositions.
- the invention provides any of the polypeptides (including functional fragments and functional variants) as well as peptidomimetics, fatty acid derivatives, conjugates, nucleic acids, recombinant expression vectors, and host cells (including populations thereof), and A pharmaceutical composition of a pharmaceutically acceptable carrier.
- a pharmaceutical composition of the invention comprising any of the agents of the invention may comprise more than one substance of the invention, for example: a polypeptide and a nucleic acid, or two or more different polypeptides.
- the pharmaceutical composition may include a combination with another pharmaceutically active agent or drug.
- the other or more pharmaceutically active agents or drugs may preferably include, for example, a chemotherapeutic agent such as asparaginase, busulfan, carboplatin, cisplatin, daunorubicin, doxorubicin, fluorouracil, gemcitabine, Hydroxyurea, methotrexate, paclitaxel, rituximab, vinblastine, vincristine, and the like.
- the pharmaceutically acceptable carrier may be any of those conventionally used, and they may be defined only by chemical physical factors such as solubility and lack of reactivity with the active compound, and by route of administration.
- compositions such as vehicles, adjuvants, excipients and diluents, and the like, which are described herein, are well known to those skilled in the art and are readily available to the public.
- the pharmaceutically acceptable carrier is chemically inert to the active agent and does not have deleterious side effects or toxicity under the conditions of use.
- the amount or dose of a substance of the invention to be administered should produce, for example, a therapeutic or prophylactic response in a subject or animal within a reasonable time frame.
- the dose of the substance of the present invention should be sufficient to inhibit the proliferation of diseased cells during the period of about 1 hour or more, such as 12-24 hours or longer from the time of administration, to treat or prevent diseases (e.g., tumors, etc.). effect. In certain embodiments, the time period may even be longer.
- the dosage should be determined by the efficacy of the particular substance of the invention and the condition of the animal (e.g., human) to be treated, as well as the body weight of the animal (e.g., human). Determining many of the assay doses The method is known in the art. One of ordinary skill in the art will readily appreciate that the materials of the present invention may be modified in any manner to enhance the therapeutic or prophylactic efficacy of the agents of the present invention.
- a substance of the invention can be conjugated to a targeted moiety either directly or indirectly via a linker.
- the practice of conjugating a compound, such as a substance of the invention, to a targeting moiety is well known in the art (see, e.g., U.S. Patent No. 5,087,616).
- the agents of the invention may be modified in the form of a depot such that the manner in which the substance of the invention is released into the body to which it is administered is controlled in terms of time and in vivo parts (see, e.g., U.S. Patent No. 4,450 , 150).
- the depot form of the substance of the invention may be, for example, an implantable composition comprising a substance of the invention and a porous or non-porous material such as a polymer, wherein the substance of the invention is diffused by degradation of the substance and/or the non-porous substance .
- the depot is then implanted into the desired site in the body and the material of the invention is released from the implant at a predetermined rate.
- the present invention provides a method of preventing and treating tumor, fatty liver or obesity comprising contacting a diseased cell with any of the pharmaceutical compositions of the present invention having an effective inhibitory amount.
- the pharmaceutical composition of the present invention can be delivered to diseased cells by any conventional method.
- the pharmaceutical composition is administered topically to the host.
- the pharmaceutical composition is administered directly to the diseased cells, for example, for intratumoral delivery of tumor cells.
- the pharmaceutical composition of the present invention comprising a polypeptide (including functional fragments and functional variants) and a peptide mimetic, a nucleic acid, a recombinant expression vector, and/or a host cell, can be used for the prevention and treatment of diseases such as tumors, fatty liver and obesity.
- diseases such as tumors, fatty liver and obesity.
- the host is a mammal.
- the host is a human.
- the amino acid sequence synthesized by the method of the invention is Gly-Gly-Cys-Arg-His-Lys-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys-Asn-Phe-Ph e-Thr (SEQ ID NO: 1)
- the polypeptide (hereinafter referred to as Anti-FAS-P18).
- the polypeptide is prepared by a solid phase synthesis method, such as using the AAPPTECApex 396 polypeptide synthesis instrument (purchased from Hong Kong Global Analytical Testing Instrument Co., Ltd.), and the amino acid is sequenced according to SEQ ID NO: 1 in a closed explosion-proof glass reactor. Synthesis from the C-terminus to the N-terminus, which means that the first is added to the amino acid sequence.
- the amino acid monomer of Gly-Gly-Cys-Arg-His-Lys-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys-Asn-Phe-Ph e-Thr is the Thr at the C-terminus, and then Phe , then Phe, until the last Gly and the G-terminus at the N-end, constantly adding, reacting, synthesizing, and operating, and finally obtaining the desired amino acid sequence.
- the solid phase synthesis method greatly reduces the difficulty of purification of each step of the product. In order to prevent the occurrence of side reactions, the side chains of the amino acids participating in the reaction are all protected. The carboxy terminus is free and must be activated prior to the reaction.
- the specific synthesis consists of the following cycles:
- the elongation of the peptide chain is carried out on an insoluble polystyrene resin carrier.
- the C-terminus of the synthetic polypeptide is first reacted with a chloromethyl polystyrene resin (benzyl chloride resin) to form a benzyl ester, and then the amino acid-protected amino acid is added one by one in the order of the primary structure of the peptide chain to make the peptide Chain extension.
- the synthetic peptide Anti-FAS-P18 was analyzed by high pressure liquid chromatography (HPLC) (using a PLC Agela C18 column) and showed a purity of 98.11% (Fig. 1).
- Example 2 Anti-FAS activity of in vitro polypeptides
- the first method is to clone the cDNA expressing the polypeptide of Example 1 into the eukaryotic expression vector pcDNA3.1 by molecular cloning technique. ( + ), through gene transfection, in the liver cancer cells to achieve the purpose of expressing the polypeptides studied, and then observe the effect of the polypeptides studied to inhibit FAS; the second method is to use artificially synthesized peptides, directly added to cultured liver cancer cells In the culture medium, the effect of the polypeptide on the inhibition of FAS was observed.
- the cells used in the experiment were liver cancer HepG2 cells.
- the luciferase reporter gene detection method detects whether the promoter activity of SREBP-lc is inhibited at the molecular level, which reflects the transcription of FAS gene. At the same time, the detection of FAS promoter activity can directly reflect whether FAS transcription is inhibited; nuclear factor ⁇ (NF- ⁇ ) is an important transcription factor. An increase in NF- ⁇ promoter activity means that cell proliferation is accelerated. Therefore, the activity of the NF- ⁇ promoter can be detected to reflect the cell proliferation.
- NF- ⁇ nuclear factor ⁇
- Example 1 3-(4,5-dimethyl-2-thiazole)-2,5-diphenyltetrazolium bromide (MTT). The effect of the above HepG2 cell proliferation.
- Reagent Name Source Company Name, Address
- Agarose Solarbio Beijing, China Plasmid Mini Kits Transgen, Beijing, China
- Forward DNA oligo (50 ⁇ ) 10 (5'-AATTCATGGGAGGCTGTAGGCATAAATTGGTCTGCGC
- Reverse DNA oligo (50 ⁇ ) 10 ( 5 '-TCGAGTCAGGTGAAAAAGTTGCATGGTGCT
- Annealing conditions 95 ° C, 2 minutes; every 8 seconds drop 0.1 ° C to 25 ° C, 90 minutes; 4 ° C, ⁇ .
- the DH5a strain containing pcDNA3.1 ( + ) plasmid (purchased from the original Pingyi (Tianjin) Biotechnology Co., Ltd.) was activated, and the monoclonal was picked and added to the LB liquid medium (containing ampicillin 100 mg/L). Incubate overnight at °C. TransGen's Plasmid Mini Kit The plasmid was extracted.
- the synthetic base sequence includes ggaggctgta ggcataaatt ggtctgcgca ccagcaccat gcaacttttt cacc (SEQ ID NO: 7), and the linkage diagram is shown in FIG.
- step 8 2) Add the 25 ⁇ ligation product from step 8 to the centrifuge tube containing the competent bacteria in the clean bench, mix with the gun head, and let stand on ice for 30 minutes;
- reaction product was subjected to electrophoresis analysis on a 1.5% agarose gel.
- the positive clones were sent to the biotech company for sequencing. This plasmid was named p-Anti-FAS-P18.
- liver cancer HepG2 cell line used in the experiment was purchased from Shanghai Jinma Biotechnology Co., Ltd.
- Promoter reporter gene vector SREBP-lc-571-Luc-WT, pFAS-WT-Luc, pGL3-NF-KB, 0.3 ⁇ g each, available from Yuanpingyi (Tianjin) Biotechnology Co., Ltd.
- the cells were transfected into the cells by liposome method while the Renilla luciferase expression vector (pRL-TK, 0.1 ⁇ g, purchased from Promega) was used as an internal reference.
- step A Simultaneously transfect different peptides of the polypeptide obtained in step A (0.5 wg, 1.0 ug 2.0 ⁇ g/well) or add different concentrations of the synthetic polypeptide obtained in Example 1 (1 ⁇ , 10 ⁇ and 100 ⁇ ) ), repeat 3 wells per concentration.
- the cells were cultured in single-layer cultures up to 90%, washed three times with pre-cooled PBS; the cells were digested with an appropriate amount of 0.25% trypsin solution, and the cytoplasm was retracted. When the cell gap was increased, the trypsin solution was discarded. Wash the pre-cooled PBS 3 times;
- Coomassie Brilliant Blue Staining Solution Contains 0.01% (w/v) G-250, 4.7% (w/v) ethanol, 8.5% (w/v) phosphoric acid;
- Standard protein solution Crystallized bovine serum albumin (BSA), formulated into 2 mg/ml protein solution with PBS;
- the separation gel solution was added to the electrophoresis plate, and an aqueous layer was placed thereon to isolate the air. After solidification, pour off the upper layer of water. Add the gel quickly and carefully insert the comb to avoid mixing bubbles. After the gel is completely polymerized, a running buffer is added to the electrophoresis tank, and the comb is carefully removed. The cell lysate was mixed with bromophenol blue in a ratio of 4:1, and subjected to steady-state electrophoresis (concentrated gel, 100 V; separation gel, 200 V).
- the PVDF membrane is first immersed in methanol for 10-15 seconds, then immersed in pure water for 2 minutes, and then immersed in a transfer buffer for 15 minutes; the filter paper is immersed in the transfer buffer;
- the gel can be transferred to Coomassie blue dye solution for staining
- the X-ray film is immersed in the developing solution for 3-5 minutes, and when the dark band is present, it is washed under the tap water;
- Inoculation of cells Cells in logarithmic growth phase (cells listed in Table 1) were mixed into a single cell suspension with RPMI1640 or DMEM containing 10% fetal bovine serum at 4000-5000 cells per well. Inoculate into a 96-well cell culture plate at a volume of 100 ul per well.
- the HepG2 cells in the logarithmic growth phase were digested with trypsin to prepare a cell suspension, and the number of cells was counted, diluted with sterilized physiological saline cells to IX 10 7 cells/ml, and stored in ice water. Twelve 4 to 6 weeks old female BALB/C nude mice were randomly divided into 2 groups: 1 control group, 0.2 ml of the above diluted cells were injected subcutaneously into the right forelimb of each mouse, and only 0.5 was injected. Ml sterilized distilled water (without peptide drug); 2 experimental group (administered dose of 10 mg / kg body weight). 0.2 ml of the above diluted cells were injected subcutaneously into the right forelimb of each mouse.
- Tumor inhibition rate xl 00%
- the invention also explores the role of functional variants of polypeptides and functional fragments thereof.
- sequences shown in the table below are based on Anti-FAS-P18 for amino acid addition (for example, adding an amino acid on the terminal side) or conservative amino acid substitution (for example, replacing one amino acid with another amino acid of the same type).
- the polypeptide fragment was artificially synthesized according to the sequence (method as above), and then the change in the action of the obtained polypeptide was observed by the above reporter gene and MTT assay. Synthetic polypeptide fragment amino acid sequence SEQ ID NO.
- Anti-FAS-P18 Gly-Gly-Cys-Arg-His-Lys-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys-Asn-Phe-Phe-Thr 1 (P18) or G-G-C-R-H-K-L-V-C-A-P-A-P-C-N-F-F-T
- Anti-FAS-P18-2 Ile-Gly-Gly-Cys-Arg-His-Lys-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys-Asn-Phe-Phe-Thr 3 (PI 8-2 ) or IGGCRHKLVCAPAPCNFFT
- Anti-FAS-P18-3 Gly-Gly-Cys-Lys-His-Lys-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys-Asn-Phe-Phe-Thr 4 (PI 8-3) or GGCKHKLVCAPAPCNFFT
- Anti-FAS-P18-4 Gly-Gly-Arg-Arg-His-Lys-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys-Asn-Phe-Phe-Thr 5 (PI 8-4) or GGCRRKLVCAPAPCNFFT
- Anti-FAS-P18-5 Gly-Gly-Cys-Arg-His-His-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys-Asn-Phe-Phe-Thr 6 (PI 8-5) or GGCRHHLVCAPAPCNFFT
- Anti-FAS-P18-1 gtcggaggct gtaggcataa attggtctgc gcaccagcac catgcaactt tttcacc 8 (P18-1)
- Anti-FAS-P18-2 atcggaggct gtaggcataa attggtctgc gcaccagcac catgcaactt tttcacc 9 (PI 8-2)
- Anti-FAS-P18-4 ggaggctgtc atcataaatt ggtctgcgca ccagcaccat gcaacttttt cacc 11 (PI 8-4)
- Anti-FAS-P18-5 ggaggctgta ggcatcattt ggtctgcgca ccagcaccat gcaacttttt cacc 12 (PI 8-5)
- the functional variant of the polypeptide Anti-FAS-P18 of the present invention is SERBP-lc
- the promoter activities of FAS and NF- ⁇ and the proliferation of HepG2 cells in liver cancer have different degrees of inhibition.
- Example 5 Acute toxicity test of polypeptide drugs
- the present invention describes the preferred embodiments, including the best mode known to the inventors to carry out the invention.
- the present invention encompasses possible variations of these preferred embodiments, and the inventors intend to use these different from the specific description herein.
- the present invention is embodied in the same manner, and such variations are also apparent to those of ordinary skill in the art and are intended to be utilized. To the extent that the law is to be construed, the invention includes the modifications and equivalents of the subject matter recited in the appended claims, unless otherwise indicated herein.
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Description
抗脂肪酸合成酶多肽及其应用 技术领域
本发明涉及多肽药物领域, 具体涉及抗脂肪酸合成酶的多肽和编 码此多肽的多核苷酸, 以及它们的应用。 背景技术
脂肪酸合成酶 (Fatty acid syntheses, FAS ) 是生物体内源性脂肪 酸合成过程中的关键酶, 它通过催化乙酰辅酶 A和丙二酰辅酶 A而生 成长链脂肪酸。 FAS包括乙酰基转移酶(AT)、丙二酰基转移酶(MT)、 β-酮脂酰合酶(KS )、 β-酮脂酰还原酶(KR)、 β-羟脂酰脱水酶(HD)、 烯脂酰还原酶 (ER) 及硫酯酶 (ΤΕ) 等 7个功能域。 FAS与肥胖密切相 关, 在脂肪组织中有较高的表达。 同时, FAS在人的肝脏中甚至有更高 的表达, 肝脏的脂肪酸合成能力较脂肪组织高 8〜9倍, 因此, FAS也与 脂肪肝的形成密切相关。 脂肪肝, 是指由于各种原因引起的肝细胞内 脂肪堆积过多的病变。 此外, 传统的理论认为脂肪酸合成代谢只是一 个能量合成存储途径而已, 但目前大量研究表明, 乳腺癌、 肝癌、 前 列腺癌、 卵巢癌、 结直肠癌和子宫内膜癌等肿瘤组织中 FAS的表达水平 远高于正常组织,而抑制 FAS在上述肿瘤组织的活性可明显抑制肿瘤的 生长。 因此, FAS也正日益成为治疗上述疾病的药物新靶标。 因此, 研究 FAS抑制剂对于抑制内源性脂肪酸生物合成, 从而有 效地控制肿瘤、 脂肪肝、 肥胖及各种相关代谢综合症等疾病的发生、 发展具有重要的意义。 已有研究显示, FAS的特异性小分子抑制剂可以 通过抑制 FAS, 进而减少脂肪酸的合成。 由于脂肪酸合成受阻, 导致其 底物丙二酰辅酶 A浓度升高, 可直接作用于下丘脑的进食中枢, 抑制 促进摄食的神经肽 Y的分泌, 从而导致进食抑制。 此外, FAS抑制剂还 可以改善非胰岛素依赖型糖尿病, 降低高血压、 冠状动脉栓塞及其它 肥胖并发症的症状, 降低其发病率。 目前已知, 硫内酯类 C75结构类似
物、 丁内酯类及丁内酰胺类化合物、 尿素类化合物、 多酚类植物提取 物和羟基喹啉类化合物等化学物质均可能具有抑制脂肪酸生物合成酶 的作用。 但这些化合物抑制剂作为药物均有较强的毒副作用, 且有些 化学性质不稳定, 因此在临床应用中受到诸多限制。 发明内容
本发明涉及一种抗脂肪酸合成酶(FAS )的多肽, 其具有抑制 FAS 转录和表达的作用, 进而在体内外抑制 FAS的表达。 该多肽和它的肽 模拟物, 包括它们的功能片段和功能变体, 以及编码这些多肽、 肽模 拟物或它们的功能片段、 功能变体的基因, 可广泛用于预防和治疗肿 瘤、 脂肪肝和肥胖的发生和发展, 包括抑制肝癌细胞的生长和发展。 一方面, 本发明提供了分离的多肽或肽模拟物, 其包含如 SEQ ID NO: 1所示的氨基酸序列、 或其功能片段或功能变体, 所述多肽或肽模 拟物具有抑制 FAS转录和表达的功能, 可广泛用于预防和治疗肿瘤、 脂肪肝和肥胖的发生和发展, 包括抑制肝癌的发生和发展。 在本发明的一些实施例中, 上述多肽或肽模拟物可以包含与如 SEQ ID NO: 1所示的氨基酸序列具有至少 80%, 或者 90%, 或者 95%, 以及甚至更高的相同性的氨基酸序列。 在本发明的另外一些实施例中, 这些多肽或肽模拟物包含在如 SEQ ID NO: 1所示的氨基酸序列的中间或端侧添加或缺失一个或数个 氨基酸, 或者对其序列中的一个或数个氨基酸残基进行置换后得到的 氨基酸序列。 较优选地, 这些多肽或肽模拟物包含在如 SEQ ID NO: 1 所示的氨基酸序列的端侧添加或缺失一个氨基酸后得到的氨基酸, 或 者对其氨基酸序列中的一个氨基酸残基进行保守性置换后得到的氨基 酸序列。 更优选地, 这些多肽或肽模拟物包含如 SEQ ID NOs: 1-6所示 的任一种氨基酸序列。
另一方面, 本发明提供分离的多核苷酸, 所述多核苷酸包含编码 如 SEQ ID NO: 1所示的氨基酸序列、 其功能片段或功能变体的多核苷 酸; 或者包含与编码如 SEQ ID NO: 1所示的氨基酸序列、 其功能片段 或功能变体的多核苷酸互补或严格杂交的多核苷酸。 优选地, 所述如 SEQ ID NO: 1所示的氨基酸序列的功能片段或功能变体包含在如 SEQ
ID NO: 1所示的氨基酸序列的中间或端侧添加或缺失一个或数个氨基 酸, 或者对其序列中的一个或数个氨基酸残基进行置换后得到的氨基 酸序列。 较优选地, 所述如 SEQ ID NO: 1所示的氨基酸序列的功能片 段或功能变体包括在如 SEQ ID NO: 1所示的氨基酸序列的中间或端侧 添加或缺失一个氨基酸所得到的氨基酸序列, 或者对上述如 SEQ ID
NO: 1 所示的氨基酸序列中的一个氨基酸残基进行保守性置换后得到 的氨基酸序列。 更优选地, 上述如 SEQ ID NO: 1所示的氨基酸序列的 功能片段或功能变体包括如 SEQ ID NOs: 2-6所示的任一种氨基酸序 列。 另一方面, 本发明还提供含有外源多核苷酸的重组表达载体, 其 包含上述编码如 SEQ ID NO: 1所示的氨基酸序列、 其功能片段或功能 变体的多核苷酸; 或者包含与上述编码如 SEQ ID NO: 1所示的氨基酸 序列、 其功能片段或功能变体的多核苷酸互补或严格杂交的多核苷酸。 此外, 本发明也提供上述多肽或肽模拟物、 核苷酸以及重组表达 载体在制造用于预防和治疗肿瘤、 脂肪肝和肥胖的药物中的应用。 在 一个具体实施例中, 所述药物可应用于在体内外抑制肝癌细胞的生长, 从而可应用于预防和治疗肝癌。 所述药物也可以包含药物组合物, 这 些药物组合物可以包含任选的药物载体。 本发明中, 所述的多肽及其肽模拟物, 包括它们的功能片段和功 能变体, 作为抗 FAS的有效抑制因子, 具有抑制 FAS的转录和表达的 功能, 从而能用于预防和治疗肿瘤、 脂肪肝和肥胖的发生和发展, 包 括预防和治疗肝癌的发生和发展。 值得强调的是, 本发明提供的上述
多肽, 水溶性好, 性质稳定, 无免疫原性, 且具有明显的药效学作用, 因此可以成为治疗上述疾病的有效药物。 附图说明
图 1.应用高压液相色谱 (HPLC ) 对纯化后人工合成多肽
Anti-FAS-P18进行分析, 显示所获得的多肽的纯度为 98.11%。
图 2.应用报告基因检测本发明的多肽基因质粒对肝癌细胞中 SREBP-lc和 FAS启动子的影响。结果显示, -Anti-FAS-P18对 HepG2 细胞中 SREBP-lc和 FAS启动子的活性具有抑制作用, 且该抑制作用 呈剂量依赖性, 表明本发明的多肽基因表达产物具有抑制 FAS基因转 录表达的作用。 * P<0.05, ** P<0.01, 进行 Student's t test统计学分析。
图 3.检测本发明的多肽及其变异体在细胞水平对肝癌细胞 HepG2 中 SREBP-lc和 FAS启动子活性的影响。 结果显示, 人工合成的多肽 Anti-FAS-P18对肝癌 HepG2细胞中 SREBP-lc和 FAS启动子的活性具 有抑制作用, 且该抑制作用呈剂量依赖性, 表明本发明的多肽具有抑 制 FAS基因转录活性的作用。 而 100 μΜ的本发明多肽 Anti-FAS-P18 的变异体 P18-1至 P18-5对 SREBP-lc和 FAS启动子的活性也有不同程 度的抑制作用。 * P<0.05, ** P<0.01, 进行 Student's t test统计学分析。
图 4.应用免疫印迹检测本发明的多肽基因质粒对肝癌细胞中 FAS 蛋白表达水平的影响。结果显示, p-Anti-FAS-P18对 HepG2细胞中 FAS 蛋白表达水平具有抑制作用, 且该抑制作用呈剂量依赖性。
图 5.应用免疫印迹检测本发明的多肽对肝癌细胞中 FAS蛋白表达 水平的影响。 结果显示, 人工合成的多肽 Anti-FAS-P18对 HepG2细胞 中 FAS蛋白表达水平具有抑制作用, 且该抑制作用呈剂量依赖性。
图 6.应用报告基因检测本发明的多肽基因质粒对肝癌细胞中
NF-κΒ 启动子的影响。 结果显示, p-Anti-FAS-P18 对 HepG2 细胞中 NF-κΒ 启动子的活性具有抑制作用, 且该抑制作用呈剂量依赖性, 表 明肝癌细胞的增殖能力下降。 * P<0.05, ** P<0.01, 进行 Student's t test 统计学分析。
图 7.应用报告基因检测本发明的多肽及其变异体对肝癌细胞中
NF-κΒ启动子的影响。结果显示, Anti-FAS-P18对 HepG2细胞中 NF-KB 启动子的活性具有抑制作用, 且该抑制作用呈剂量依赖性, 表明肝癌 细胞的增殖能力下降。 100 μΜ 的本发明多肽 Anti-FAS-P18 的变异体 P18-1至 P18-5对 NF-KB的活性也有不同程度的抑制作用。 * P<0.05, ** P<0.01 , 进行 Student's t test统计学分析。
图 8.应用 MTT 检测本发明的多肽基因质粒对肝癌细胞增殖的影 响。 结果显示, p-Anti-FAS-P18对 HepG2细胞的增殖具有抑制作用, 且该抑制作用呈剂量依赖性。 * P<0.05, ** P<0.01, 进行 Student's t test 统计学分析。
图 9. 应用 MTT检测本发明的多肽及其变异体在细胞水平对肝癌 细胞增殖的影响。 结果显示, 人工合成的多肽 Anti-FAS-P18具有抑制 HepG2细胞增殖的作用, 且该抑制作用呈剂量依赖性。 100 μΜ的本发 明多肽 Anti-FAS-P18的变异体 P18-1至 P18-5对肝癌 HepG2细胞的增 殖也有不同程度的抑制作用。 * P<0.05, ** P<0.01, 进行 Student's t test 统计学分析。
图 10.人工合成的多肽 Anti-FAS-P18对 HepG2细胞的作用。 裸鼠 接种实验结果显示, 应用本发明人工合成的多肽 Anti-FAS-P18 对 HepG2细胞的生长和增殖具有明显的抑制作用。 ** P<0.01, Student's t test统计学分析
图 11 : 人工合成的多肽 Anti-FAS-P18 ( P18 ) 对裸鼠体重的影响。 裸鼠接种实验中, 应用人工合成的多肽 Anti-FAS-P18对裸鼠的体重无 明显影响。
图 12. 构建多肽真核表达载体的连接示意图 具体实施方式
本发明中, 包括说明书和权利要求书, 使用的下列术语除非特别 说明, 具有如下的含义:
"分离的" 一词是指将物质从它原始的环境 (例如, 若是自然产 生的就指其天然环境) 分离出来。 比如说, 一个自然产生的多核苷酸 或多肽存在于活动物中就是没有被分离出来, 而同样的多核苷酸或多
肽同一些或全部在自然系统中与之共存的物质分开就是分离的。 这样 的多核苷酸或多肽可以是某一载体的一部分, 也可以是某一组合物的 一部分。 既然载体和组合物不是它的天然环境的成分, 它们仍然是分 离的。
"纯化的" 一词意指已经在纯度上提高的。 "纯度" 在这是相对 术语, 并不必要地解释为绝对纯度。 例如, 纯度可以是至少约 50%, 或 可以是大于 60 %、 70 %、 80 %、 90 %、 或可以是 100%。 如本发明中所用, 分离的物质是从其原始环境中分离出来。 活体 细胞内的天然状态下的多核苷酸和多肽是没有分离的, 但同样的多核 苷酸和多肽如与天然状态中存在的其它物质分开, 则为分离的, 同时 纯度上得到了提高, 也因此是纯化的。 "核酸" 、 "核酸序列" 或 "碱基序列" 是指核苷酸, 寡核苷酸 或多核苷酸及其片段或部分。 本发明的核酸能够以 RNA (例如 mRNA) 的形态、 或 DNA的形态 (例如 cDNA或基因组 DNA) 存在。 DNA可以 是双链, 也可以是单链。 单链 DNA或 RNA可以是编码链 (有义链) 、 或非编码链 (反义链) 中任一种。 另外, 本发明的多核苷酸也可以在 其 5 ' 端或 3 ' 端融合编码标签标记 (标签序列或标记物序列) 的多核 苷酸。它们可以是合成的或是从天然来源获得的(例如分离和 /或纯化), 其可以包含天然的、 非天然的或者修饰过的核苷酸, 并且其可以包含 天然的、 非天然的或改变的核苷酸之间的键, 诸如氨基磷酸酯键或硫 代磷酸酯键, 用来代替在未修饰的寡核苷酸中核苷酸之间存在的磷酸 二酯键。 所谓 "氨基酸序列"或 "多肽"是指肽、 寡肽、 多肽或蛋白质及 其部分片段, 其间以肽键相连接的氨基酸。 当本发明中的 "氨基酸序 列" 涉及一种天然存在的蛋白质分子的氨基酸序列时, 这种 "多肽" 或 "蛋白质" 并不意味着将氨基酸序列限制为与所述蛋白质分子相关
的完整的天然氨基酸序列。 本发明的氨基酸序列可以含有附加的肽。 作为附加的肽, 如多组氨酸标签 (His-tag) 、 或 Myc、 FLAG等表位标 记的肽为例。 "缺失" 是指在氨基酸序列或核苷酸序列中一个或多个氨基酸或 核苷酸的缺失。
"插入" 或 "添加" 是指在氨基酸序列或核苷酸序列中的改变导 致与天然存在或改变前的分子相比, 一个或多个氨基酸或核苷酸的增 力口。
"置换" 是指由不同的氨基酸或核苷酸替换一个或多个氨基酸或 核苷酸。 "缺失、 置换或添加一个或多个氨基酸或核苷酸" 则是指, 利用 定位诱变法等公知的突变核酸或多肽的制作法缺失、 置换或添加一个 或多个氨基酸或核苷酸, 或对天然存在的核酸或多肽的上述突变进行 分离纯化。 对氨基酸的突变, 可以包含有一个或多个氨基酸残基为 D- 型构象的氨基酸、 自然界存在的稀有氨基酸、 或者是人工修饰的氨基 酸, 这些氨基酸可以是也可以不是由遗传密码子编码的。 与此相类似 的, 诱导核酸发生突变, 可以包括自然界天然存在的核苷酸, 也可以 包括具有修饰的核苷酸。 多肽的 "功能片段" 是指所述多肽的任何部分, 该部分保留其作 为一部分的多肽 (即 "亲本" 多肽) 的基本相似或相同的生物学活性 和功能。 多肽的 "功能变体" 是指基本上保持如所述多肽或氨基酸序 列相同或相似的生物学功能或活性的氨基酸序列, 它们可以包括, 例 如, 1 )原氨基酸序列中一个或多个氨基酸残基有缺失和 /或一个或多个 氨基酸残基被添加; 或者 2) 原氨基酸序列中一个或多个氨基酸残基被 保守或非保守氨基酸残基置换; 或者 3 ) 原氨基酸序列中一个或多个氨
基酸残基上的某个基团被其它基团取代; 或者 4 ) 原氨基酸序列和另外 的分子或化合物 (比如糖、 脂类、 聚乙二醇等) 的融合; 或者 5 ) 原有 的氨基酸序列与添加的氨基酸序列融合进而形成的多肽序列 (如前导 序列或分泌序列或用来纯化此多肽的序列等) ; 或者 6 ) 原氨基酸序列 的逆反类似物; 或者 7 ) 以上各种情况的混合。 本发明中, 氨基酸序列 的功能变体, 可以包含有一个或多个氨基酸残基构象为 D-型的氨基酸, 自然界存在的稀有氨基酸或人工修饰的氨基酸, 这些氨基酸可以是也 可以不是由遗传密码子编码的。 多肽的 "逆反类似物" 是指包括反转的亲本多肽氨基酸序列的多 肽, 以致所述逆反类似物的氨基酸序列 (当从 N端向 C端读取时) 与当 从 C端向 N端读取时的亲本多肽的氨基酸序列相同; 此外, 逆反类似物 中每一个氨基酸是该氨基酸的 D异构体, D异构体与 L异构体相反。 例 如, 三肽 Val-Ala-Gly的逆反类似物具有氨基酸序列 Gly-Ala-Val, 其中 每个氨基酸是 D异构体。 本发明中, "肽模拟物" 是指具有与相对应多肽基本相同的通用 结构且具有例如能增加其稳定性或生物学功能的修饰的化合物。 肽模 拟物包括, 例如, 包含与相对应多肽的相同氨基酸序列的那些化合物, 但在其中两个或更多个氨基酸之间, 肽模拟物具有改变的主链。 所述 肽模拟物可以包括合成的或非天然存在的氨基酸, 用来代替天然存在 的氨基酸。 本发明中, 核苷酸序列的 "简并变异体"是这样的多核苷酸序列, 其与亲本核苷酸序列有区别, 但编码的蛋白质或多肽和亲本核苷酸序 列所编码的蛋白质或多肽一样。
"核酸杂交"在本领域已公知(参见,例如 Sambrook等, Molecular Cloning: A Laboratory Manual, 3rd Ed., Cold Spring Harbor Laboratory, 2001 ) 。 通常, 温度越高, 盐浓度越低, 则严谨性变得越高 (难以杂
交) , 从而能够取得更加相同的多核苷酸。 适合的杂交温度根据碱基 序列或其碱基序列的长度而异。 另外, 本发明还涉及在 "严格条件" 下杂交。 本发明中, "严格条件" 是指, 在较低离子强度和较高温度 下的杂交和洗脱。例如, 在 42°C的条件下、在杂交溶液(含 50%甲酰胺、 5 X SSC( 150mM 氯化钠 +15mM柠檬酸三钠)、 50mM的磷酸钠(pH7.6 )、
5 X邓哈特溶液、 10%硫酸葡聚糖和 20 g/ml的变性剪切鲑鱼精子 DNA) 中孵育过夜, 然后在 65 °C条件下用 0.1 X SSC洗脱。
"同源性" 是指互补的程度, 可以是部分同源, 也可以是完全同 源。 "部分同源" 是指一种部分互补的序列, 其可部分抑制完全互补 的序列与靶核酸的杂交。 这种抑制可通过在严格性程度降低的条件下 进行杂交(Southern 印迹或 Northern印迹等) 来检测。 基本同源的序列 或杂交探针可竞争和抑制完全互补的序列与靶序列在严格性程度降低 的条件下的结合。 当然, 严格性降低的条件并非允许非特异性的结合, 两条序列相互结合, 仍然需要特异性或选择性的相互作用。 氨基酸序列或核苷酸序列的 "相同性" 或 "同一性" 百分率是指 在两种或多种氨基酸或核苷酸序列比较中, 序列相同或相似的百分率。 有很多本领域技术人员熟知的方法测定相同性百分率, 如通过 MEGALIGN程序 ( Lasergene software package, DNASTA, Inc., Madison,
WI) 。 MEGALIGN程序可根据不同的方法如 Cluster法比较两种或多种 序列 (参见 Higgins & Sharp, Gene 73:237-244, (1988) ) , Cluster法通过 检査所有配对之间的距离将各组序列排列成簇, 然后将簇以成对或成 组分配。 两个氨基酸序列如序列 A和序列 B之间的相同性百分率可以通 过下式计算:
[ (序列 A与序列 B之间匹配的残基个数) I (序列 A的残基数 -序列 A中间隔残基数 -序列 B中间隔残基数) ] X 100% 同理, 也可以通过 Gluster法或其他本领域已知的方法 (参见 Hein J., Methods in Emzumology 183:625-645, 1990 ) , 测定核酸序列的相同
性百分率。
"重组表达载体" 是指遗传修饰的寡核苷酸或多核苷酸重组体, 该重组体克隆有编码 mRNA 、 蛋白、 多肽、 或肽的核苷酸序列, 当该 表达载体进入宿主细胞后可表达相应的 mRNA、 蛋白、 多肽、 或肽。 本 发明中, 重组表达载体可以包含任意类型的核苷酸序列, 但不仅限于 是 DNA或 RNA, 可为单链或双链、 人工合成或来自天然, 也可为非天 然的或改变的核苷酸。 核苷酸之间的键可以是天然存在的、 也可以是 非天然存在的或修饰的。 本发明中, "治疗" 和 "预防" 以及由它们派生的词语, 但并不 意味是 100 %的或完全的治疗或预防, 可以认定为本领域技术人员所认 同的治疗或预防程度。 本发明中的 "预防" 可理解为延迟疾病、 或其 症状或病症的发作。 多肽
本发明涉及分离或纯化的多肽, 该多肽可以是包含、 基本由、 或 由 氨 基 酸 序 列 Gly-Gly-Cys-Arg-His-Lys-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys-Asn-Phe-Ph e-Thr ( SEQ ID NO: 1 ) 所组成的多肽。
FAS基因的表达受其上游调控因子固醇类调节元件结合蛋白 lc ( sterol regulatory element binding protein lc, SERBP-lc ) 的调控。 当 SERBP-lc转录活性受到抑制时, FAS基因的表达水平下调。 因此, 调 控 SERBP-lc启动子的活性, 可间接调节 FAS基因的表达。 上述本发明 的多肽, 可以通过抑制 SERBP-lc的转录, 进而发挥抑制 FAS转录和表 达的作用, 因此可以用于预防和治疗肿瘤、 脂肪肝和肥胖的发生和发 展, 包括抑制肝癌细胞的发生和发展。 所述抑制作用在分子水平、 细胞水平和动物水平均有体现。 如所
述多肽在分子水平上可以抑制 SREBP-lc和 FAS启动子的活性, 并下调 FAS蛋白的表达水平, 从而构成对 FAS的有效抑制, 且其抑制效果呈量 效关系; 所述多肽的上述抑制作用也体现在细胞水平上, 如所述多肽 通过抗 FAS的作用能抑制体外肿瘤细胞的生长和增殖,且其抑制效果也 呈量效关系; 通过裸鼠接种方法显示, 所述多肽在动物水平也能有效 抑制肿瘤细胞的成瘤能力, 而同时, 所述多肽对裸鼠体重无影响。 本发明还提供所述本发明多肽的各种功能片段。 所述功能片段可 以是本发明多肽的连续氨基酸序列的任何片段, 条件是其与亲本多肽 相比, 能以相似程度、 相同程度、 或更高程度保留亲本多肽的生物活 性, 例如抑制 FAS转录和表达的活性。 参照亲本多肽, 所述功能片段可 以具有例如亲本多肽的约 10%、 20%、 30%、 40%、 50 %、 60%、 70%、 80 %、 90 %、 95%、 100%、 105%、 1 10%、 120%、 150%、 200% 或更 高的活性。 本发明多肽的功能片段, 优选包括与所述亲本多肽具有至 少 70%的序列同一性的氨基酸序列。 另外, 本发明的多肽及其功能片段的功能变体也包括在本发明范 围之内。 所述本发明的多肽及其功能片段的功能变体保留与所述亲本 多肽或亲本功能片段基本相似、 相同、 甚至是增强的生物活性, 例如 抑制 FAS的转录和表达, 以及有效地抑制肿瘤细胞的生长和增殖。参照 所述亲本多肽或其功能片段, 所述功能变体可以与所述亲本多肽或其 功能片段的氨基酸序列至少有约 50 %、 60%、 70 %、 80 %、 90 %、 95% 或 100%的同一性。 优选地, 本发明的多肽及其功能片段的功能变体与 所述亲本多肽或其功能片段具有至少 80%、 或 90%、 或 95%、 甚至更高 的序列同一性。 更优选的, 本发明的多肽及其功能片段的功能变体与 所述亲本多肽及其功能片段只有一个或数个氨基酸的区别。 在一些特 别优选的实施例中, 本发明的多肽及其功能片段的功能变体与所述亲 本多肽或亲本功能片段仅仅只有一个氨基酸的区别。 所述本发明的多肽及其功能片段的功能变体可以包括由亲本多肽
或亲本功能片段氨基酸通过置换得到的氨基酸序列。 例如, 它们可以 包含具有至少一个保守氨基酸置换的亲本多肽或亲本功能片段氨基酸 序列。 具体来说, 所述本发明的多肽及其功能片段的功能变体可以包 含具有 1个、 2个、 3个、 4个、 5个、 或更多个保守氨基酸置换的亲本多 肽或亲本功能片段的氨基酸序列。 另外, 所述本发明的多肽及其功能 片段的功能变体也可以包含具有至少一个非保守氨基酸置换的亲本多 肽或亲本功能片段的氨基酸序列。 具体来说, 可以包括具有 1个、 2个、 3个、 4个、 5个、 或更多个非保守氨基酸置换的亲本多肽或亲本功能片 段的氨基酸序列。 在这些情形中, 对于所述的氨基酸置换, 优选的是 不妨碍或抑制所述功能变体的生物学功能或活性。 更优选地, 所述氨 基酸置换提高本发明的多肽及其功能片段的功能变体的生物学功能或 活性, 以致当与所述亲本多肽或亲本功能片段相比较时, 所述功能变 体的生物学功能或活性提高。 优选地, 本发明的多肽及其功能片段的功能变体包括一个或数个 保守氨基酸置换。 在本领域内, 保守氨基酸置换是公知的, 它指的是 这样的氨基酸置换, SP, 其中一个具有某种物理和 /或化学特性的氨 基酸被换为另一个具有相同化学或物理特性的氨基酸。 本领域技术人 员了解, 保守性的氨基酸置换可以不造成蛋白质的结构或功能的显著 改变。 典型的保守性置换包括, 例如, 用酸性氨基酸置换另一个酸性 氨基酸 (例如 Asp或 Glu) , 用具有非极性侧链的氨基酸置换另一个具 有非极性侧链的氨基酸 (例如 Ala、 Gly、 Val、 lie, Leu、 Met, Phe、 Pro, Trp、 Val等) , 用碱性氨基酸置换另一个碱性氨基酸 (Lys、 Arg 等) , 用具有极性侧链的氨基酸置换另一个具有极性侧链的氨基酸 (Asn、 Cys、 Gln、 Ser、 Thr、 Tyr等) , 用芳香氨基酸 (Trp、 Phe、 Tyr 等) 置换另一个芳香氨基酸, 等。 所述功能变体还可以通过在所述多肽及其功能片段的中间、 其氨 基或羧基端、 和 /或其氨基以及羧基两端, 添加和 /或缺失一个或多个氨 基酸而得到。 优选地, 所述添加或缺失的氨基酸不妨碍所述多肽或功
能片段的生物学功能和活性, 例如, 抑制 FAS的转录和表达, 并有效地 抑制肿瘤细胞, 包括肝癌细胞的生长和增殖。 更优选地, 当与所述亲 本多肽的生物学活性相比较时, 所述额外的氨基酸能够导致增强的生 物学活性。 另外, 本发明的多肽及其功能片段的功能变体还可以包括本发明 的多肽或其功能片段的逆反类似物。 本发明中, "逆反类似物 " 是指 包括反转的亲本多肽氨基酸序列的多肽, 以致所述逆反类似物的氨基 酸序列(当从 N端向 C端读取时)与当从 C端向 N端读取时的亲本多肽的 氨基酸序列相同。 此外, 关于逆反类似物, 每一个氨基酸是该氨基酸 的 D异构体, D异构体与 L异构体相反。 例如, 三肽 Val-Ala-Gly的逆反 类似物具有氨基酸序列 Gly-Ala-Val, 其中每个氨基酸是 D异构体。本发 明中, 所述此类的功能变体优选包括 SEQ ID NO: 1的逆反类似物。 本发明的多肽、 其功能片段或功能变体可以是任意长度的, 艮卩, 可以包括任意数目的氨基酸, 条件是所述多肽 (包括功能片段) 及其 功能变体保留必要的生物学活性, 例如, 抑制 FAS的转录和表达, 以及 有效地抑制癌细胞, 优选是肝癌细胞。 举例来说, 本发明的多肽 (包 括功能片段和功能变体)可以是 4-2000个氨基酸长, 如长度为 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 125
150, 175, 200, 300, 400, 500, 700, 800, 1000或更多。 优选地, 本发明的 多肽长度在 30个氨基酸以内, 且能满足作为多肽药物的药效学和半衰 期的要求。 在本发明的一些具体实施例中, 本发明提供的多肽具有与如 SEQ
ID NO: 1所示的氨基酸序列具有一个或数个氨基酸区别的氨基酸序列, 包括例如 1个、 2个、 3个、 4个、 5个氨基酸的区别。 这些氨基酸序列可 以通过,例如,在 SEQ ID NO: 1的端侧或中间添加或缺失一个或数个氨 基酸残基,或者将 SEQ ID NO: 1中的某个或某数个氨基酸残基进行替换 等方法获得。这样所获得的功能变体具有与亲本多肽 SEQ ID NO: 1相似
的生物学活性和功能, 例如, 抑制 FAS的转录和表达, 以及有效地抑制 肿瘤细胞, 包括肝癌细胞。 优选地, 这些功能变体可以通过在亲本多 肽 SEQ ID NO: 1的端侧添加一个氨基酸, 或将亲本多肽 SEQ ID NO: 1 中的某个氨基酸进行保守置换得到。 在本发明的一个特定的实施例中, 本发明提供的多肽包括如 SEQ ID NOs: 1-6所示的氨基酸序列中的任一 种氨基酸序列。 本发明还提供所述多肽(包括其功能片段和功能变体) 的模拟物。 在一个优选的实施方案中, 所述肽模拟物是拟肽。 拟肽是指这样的肽 模拟物, 其中每个氨基酸的侧链粘附在氨基酸的氮原子上而不是 α碳 上。 例如, 拟肽可以被视为 Ν-置换的甘氨酸, 其具有 NRCH2CO通用结 构的重复单位, 并且其具有与相对应的多肽相同或基本相同的氨基酸 序列。 在另一个优选的实施方案中, 所述肽模拟物包括改变的主链, 其中在每个氨基酸之间的键是甲基化的。 在这一点上, 所述肽模拟物 可以包括下述结构的甲基化肽主链:
...NCH3 - Ca- CO - NCH3 - Ca- CO...
I I
侧链 侧链 本发明的多肽 (包括其功能片段和功能变体) 以及肽模拟物中, 可以包括用合成的氨基酸来置换天然存在的氨基酸。 所述合成的氨基 酸在本领域内是已知的, 包括例如氨基环己烷羧酸、 正亮氨酸、 a-氨基 正癸酸、 高丝氨酸、 S-乙酰氨基甲基 -半胱氨酸、 反式 -3-羟脯氨酸、 反 式 -4-羟脯氨酸、 4-氨基苯丙氨酸、 4-苯甲酰苯丙氨酸、 4-硝基苯丙氨酸、
4-氯苯丙氨酸、 4-羧基苯丙氨酸、 β-苯基丝氨酸、 β-羟基苯丙氨酸、 苯 基甘氨酸、 a-萘基丙氨酸、 环己基丙氨酸、 环己基甘氨酸、 二氢吲哚 -2- 羧酸、 1,2,3,4-四氢异哇琳 -3-羧酸、 氨基丙二酸、 氨基丙二酸单酞胺、 Ν'-苄基 -Ν'-甲基-赖氨酸、 Ν',Ν'-二苄基-赖氨酸、 6-羟基赖氨酸、 鸟氨 酸、 a-氨基环戊烷羧酸、 a-氨基环己烷羧酸、 a-氨基环庚烷羧酸、 a-(2-
氨基 -2-降冰片烷) -羧酸、 α,γ-二氨基丁酸、 α,β-二氨基丙酸、 高苯丙氨 酸、 和 α-叔-丁基甘氨酸。 本发明的多肽 (包括其功能片段和功能变体) 以及肽模拟物还可 以例如被脂化 (例如脂肪酸化) 、 糖基化、 酰胺化、 羧酸化、 磷酸化、 酯化、 Ν-酰化、 通过二硫键环化、 转化成酸加成盐、 二聚体化或多聚 体化, 和 /或缀合化。 举例来说, 本发明所述多肽 (包括其功能片段和功能变体) 以及 肽模拟物可以是脂化衍生物。 所含的脂质分子可以包括本领域己知的 任何脂质, 例如脂肪酸、 磷脂基团、 糖磷脂酰肌醇、 磷脂酰丝氨酸、 磷脂酰乙醇胺、 鞘磷脂、 磷脂酰胆碱、 心磷脂、 磷脂酰肌醇、 磷脂酸、 溶血磷酸甘油酯、 和胆固醇基团。 优选地, 所述脂化衍生物是脂肪酸 衍生物, 所述脂肪酸分子可以是任何 C8-C20脂肪酸, 例如月桂酸、 棕 榈酸、 肉豆蔻酸、 硬脂酸、 油酸、 亚油酸、 亚麻酸、 花生四烯酸、 二 十碳五烯酸、 芥酸、 或花生酸等。 所述脂肪酸还可以在任意碳原子上 任选地包含其它官能团, 例如一个或多个氨基。 所述脂肪酸分子可以 附着在本发明多肽 (包括功能片段和功能变体) 以及肽模拟物的任何 适当的部分。 例如, 在本发明的多肽氨基端、 羧基端、 或氨基和羧基 两端包括脂肪酸分子。 脂肪酸分子可以直接或通过连接体附着到本发 明的多肽 (包括功能片段和功能变体) 以及肽模拟物上。 本发明的多肽 (包括功能片段和功能变体) 以及肽模拟物, 包括 其衍生物例如脂肪酸衍生物, 还可以是单体肽、 二聚肽或多聚体肽。 本发明的多肽 (包括功能片段和功能变体) 以及肽模拟物可以通 过本领域技术人员已知的方法获得(参见, 例如 Chan 等, Fmoc Solid Phase Peptide Synthesis , 牛津大学出版社, 牛津, 英国, 2005 ; Reid,R., Peptide and Protein Drug Analysis, Marcel Dekker Company, 2000; 以及 美国专利号 5,449,752 ) 。 此外, 也可由核酸重组方法生产多肽而得到
(参见, 例如 Sambrook等, 分子克隆: 实验室手册(Molecular Cloning: A Laboratory Manual ) , 第 3版, 冷泉港出版社 (Cold Spring Harbor Press ) , 冷泉港, 纽约, 2001 ) 。 此外, 本发明的一些多肽 (包括其 功能片段以及功能变体) 可以从如植物、 细菌、 昆虫、 哺乳动物如大 鼠、 人等分离和 /或纯化。 分离和纯化的方法在本领域内也是公知的。 备选地, 本文所述的多肽 (包括其功能片段以及功能变体) 可以从商 业公司合成后购买获得。 多核苷酸
本发明还提供编码任一种所述的本发明多肽 (包括其功能片段和 功能变体) 的分离的多核苷酸。 所述多核苷酸包含任一种本发明多肽 (包括其功能片段和功能变体) 的编码序列。 例如, 本发明提供编码 SEQ ID NO: 1的核苷酸序列 SEQ ID NO: 7 ,以及这些编码序列的任一种 简并变异体; 备选地, 所述多核苷酸还可以包含附加编码序列和 /或 非编码序列。 同样,本发明也提供编码如 SEQ ID NO: 1所示的氨基酸序 列的功能片段或功能变体的多核苷酸, 这些多核苷酸也还可以包含附 加编码序列和 /或非编码序列。 另一方面, 本发明还提供这样的分离 的多核苷酸或其片段, 其所包含的核苷酸序列与前述的任一种多核苷 酸的核苷酸序列互补或能在严格条件下与其杂交。 本发明还提供上述多核苷酸的变异体, 其编码与本发明多肽 (包 括功能片段和功能变体) 有相同的氨基酸序列的多肽或多肽的功能片 断、 功能变体。 此多核苷酸的变异体可以是天然发生的等位变异体或 非天然发生的变异体。 这些核苷酸变异体包括取代变异体、 缺失变异 体和插入变异体。 如本领域所知的, 等位变异体是一个多核苷酸的替 换形式, 它可能是一个或多个核苷酸的取代、 缺失或插入, 但不会从 实质上改变其编码的多肽的功能。 本发明的多核苷酸可以是天然存在通过纯化而得到, 也可以通过 重组产生, 或者可以基于化学合成和 /或酶连接反应, 使用本领域已
知的方法而构建。 本发明的多核苷酸可以含有天然存在的核苷酸, 也 可以包含具有修饰的核苷酸。 所述具有修饰的核苷酸设计成增加分子 的生物学稳定性或增加在杂交时形成的双链体的物理稳定性 (例如, 硫代磷酸衍生物和吖啶置换的核苷酸) , 包括例如 5-氟尿嘧啶、 5-溴尿 嘧啶、 5-氯尿嘧啶、 5-碘尿嘧啶、 次黄嘌呤、 黄嘌呤、 4-乙酰胞嘧啶、
5- (羧基羟甲基)尿嘧啶、 5-甲氧基氨基甲基 -2-硫尿嘧啶、 尿嘧啶 -5-羟基 乙酸、 5-甲基 -2-硫尿嘧啶、 2-硫胞嘧啶、 2-硫尿嘧啶、 4-硫尿嘧啶、 5- 甲基尿嘧啶、 尿嘧啶 -5-羟基乙酸甲基酯、 3-(3-氨基 -3-N-2-羧丙基)尿嘧 啶、 和 2,6-二氨基嘌呤等。 并且, 其可以包含天然的或改变的核苷酸之 间的键, 诸如氨基磷酸酯键或硫代磷酸酯键, 用来代替天然存在的磷 酸二酯键。 优选的, 本发明的核酸是重组产生的。 重组表达载体
本发明还提供包括任一种本发明多核苷酸的重组表达载体。 所述 重组表达载体可以是任何适当的重组表达载体, 并且可以用于转化或 转染任何适当的宿主细胞。 适当的载体包括设计用于繁殖和扩增或用 于表达, 或同时用于二者, 如质粒或病毒。 所述载体可以通过下列自 由组合: pUC系列、 pcDNA系列, pBluescript、 pET系列、 pGEX 系列 和 pEX系列。 还可以使用噬菌体载体, 诸如 GT10、 GTI λΖαΡΙΚ EMBL4等。 植物表达载体可以包括 pBIOl、 pBI101.2, pBI101.3, pBI121 禾口 pBIN19。 动物表达载体可以包括 pEUK-Cl、 pMAM和 pMAMneo。 在 一个具体的实施例中, 本发明涉及使用 pcDNA系列的质粒。 可以使用标准重组 DNA技术制备本发明的重组表达载体。 可以制 备环形的或线性的表达载体构建体, 以包含在原核或真核宿主细胞中 起作用的复制系统。 理想地, 所述重组表达载体包括调控序列, 诸如 转录和翻译起始与终止密码子。 所述调控序列对于所述载体所引入的 宿主类型 (例如细菌、 真菌、 植物、 或动物) 是特异性的。 所述重组表达载体可以包括一种或多种标记基因, 其允许选择转
化的或转染的宿主。 标记基因包括对杀生物剂的抗性例如对抗生素、 重金属等的抗性, 在营养缺陷型宿主中互补以提供原养型, 以及催化 生物荧光等等。 对于本发明表达载体合适的标记基因包括, 例如新霉 素 / G418抗性基因、 荧光酶素报告基因、 潮霉素抗性基因、 组氨醇抗 性基因、 四环素抗性基因、 和氨苄青霉素抗性基因。 所述重组表达载体可以包括天然的或非天然的启动子。 启动子的 选择, 例如强、 弱、 诱导型, 组织特异型和发育特异型, 在技术人员 的普通技能之内。 相似地, 核苷酸序列与启动子的组合也在技术人员 的技能之内。 启动子可以是非病毒启动子或病毒启动子, 例如巨细胞 病毒 (CMV) 启动子、 SV40启动子、 RSV启动子、 以及在鼠干细胞病 毒长末端重复中存在的启动子。 本发明的重组表达载体可以设计用于 瞬时表达、 用于稳定表达、 或用于二者。 此外, 所述重组表达载体可 以制备成用于组成型表达或用于诱导型表达。 此外, 所述重组表达载体可以包括自杀基因。 "自杀基因" 是指 在细胞中表达后导致细胞死亡的基因。 自杀基因表达后可影响细胞对 某种试剂如药物的敏感性, 进而引起细胞死亡。 自杀基因在本领域内 是已知的 (参见, 例如自杀基因治疗: 方法和综述 (Suicide Gene Therapy: Methods and Reviews ), Springer, Caroline J. ( Cancer Research
UK Centre for Cancer Therapeutics at the Institute of Cancer Research, Sutton, Surrey, UK), Humana Press, 2004 ),例如单纯疤疹病毒(HSV) 胸苷激酶 (TK) 基因和嘌呤核苷磷酸酶, 以及硝基还原酶等。 宿主细胞
本发明还提供包括本文所述的任何一种重组表达载体的宿主细 胞。 宿主细胞是包含本发明重组表达载体的任何类型的细胞。 宿主细 胞可以是真核细胞例如植物、 动物、 真菌、 或藻类, 或者可以是原核 细胞例如细菌或原生动物。 宿主细胞可以是培养的细胞或原代细胞, SP , 直接从生物体如人分离的原代细胞。 宿主细胞可以是贴壁细胞或
悬浮的细胞, SP, 在混悬液中生长的细胞。 适当的宿主细胞在本领域 内是己知的, 包括例如 0115„大肠杆菌细胞、 中国仓鼠卵巢细胞、 猴 VERO细胞、 COS细胞、 HEK293细胞等。 为了扩增或复制所述重组表 达载体的目的, 所述宿主细胞优选是原核细胞。 为了产生重组修饰的 多肽或蛋白的目的, 宿主细胞优选是哺乳动物细胞。 人源细胞为优选 的宿主细胞。 宿主细胞可以是任何细胞类型, 可以来自任何类型的组 织, 并且可以是任何发育阶段的。 本发明还提供包括至少一种本文所述的宿主细胞的细胞群体。 所 述细胞群体可以是异种群体, 包括包含任一种所述重组表达载体的宿 主细胞, 以及至少一种其它细胞例如不包含任何所述重组表达载体的 宿主细胞(例如 T 细胞) , 或除 T细胞之外的细胞例如 B 细胞、 巨噬细 胞、 嗜中性粒细胞、 红细胞、 肝细胞、 内皮细胞、 上皮细胞、 肌细胞、 脑细胞等。 备选地, 所述细胞群体可以是基本同种群体, 其中所述群 体主要包括包含所述重组表达载体的宿主细胞 (例如, 主要由包含所 述重组表达载体的宿主细胞组成) 。 所述群体还可以是细胞的克隆群 体, 其中所述群体的所有细胞是包含重组表达载体的单一宿主细胞的 克隆, 以致该群体的所有细胞包含所述重组表达载体。 在本发明的一 个实施方案中, 所述细胞群体是包括包含本文所述的重组表达载体的 宿主细胞的克隆群体。 缀合物
本发明还包括缀合物例如生物缀合物, 其包括本发明的多肽 (包 括其功能片段和功能变体) 以及肽模拟物、 多核苷酸、 重组表达载体、 或宿主细胞中的任一种。 缀合物, 以及通常合成缀合物的方法在本领 域内也是已知的(参见,例如 Hudecz, F.,分子生物学方法(Methods Mol. Biol. ) 298: 209-223 (2005)和 Kirin等, 无机化学 ( Inorg. Chem. ) 44(15): 5405-5415 (2005)) 。 药物组合物
本发明所提供的上述各种物质, 包括多肽 (包括其功能片段和功 能变体) 以及肽模拟物、 脂肪酸衍生物、 多核苷酸、 重组表达载体、 以及宿主细胞 (包括其群体) 、 缀合物等 (笼统称为 "本发明物质" ) 可以是分离的、 纯化的、 合成的、 和 /或重组的。 本发明物质还可以配制成组合物, 诸如药物组合物。 在这一点上, 本发明提供包括任意所述多肽 (包括功能片段和功能变体) 以及肽模 拟物、 脂肪酸衍生物、 缀合物、 核酸、 重组表达载体和宿主细胞 (包 括其群体) , 以及药用载体的药物组合物。 包含任意本发明物质的本 发明药物组合物可以包括多于一种本发明物质, 例如: 多肽和核酸, 或两种或更多不同的多肽。 备选地, 所述药物组合物可以包括与另一 种或多种药物活性试剂或药物的组合。 所述另一种或多种药物活性试 剂或药物优选可以包括诸如化疗剂, 例如天冬酰胺酶、 白消安、 卡铂、 顺铂、 柔红霉素、 多柔比星、 氟尿嘧啶、 吉西他滨、 羟基脲、 甲氨蝶 呤、 紫杉醇、 利妥昔单抗、 长春碱、 长春新碱等。 关于药物组合物, 药用载体可以是任意常规所用的那些, 它们可 以仅通过化学物理因素, 诸如溶解性和缺乏与活性化合物的反应性, 以及通过施用的途径, 进行限定。 本发明所述的药用载体例如媒介物、 佐剂、 赋形剂和稀释剂等, 是本领域技术人员公知的, 并且容易为公 众所获得。 优选地, 所述药用载体对活性试剂是化学惰性的, 在使用 条件下不具有有害副作用或毒性。 为了达到本发明的目的, 施用的本发明物质的量或剂量应该在合 理时间范围内在受试者或动物内产生例如治疗或预防响应。 例如, 本 发明物质的剂量应该足以在从施用时刻起约 1小时以上如 12-24小时或 更长的时间期间内, 抑制患病细胞的增殖, 起到治疗或预防疾病 (例 如肿瘤等) 的作用。 在某些实施方案中, 所述时间期间甚至可以更长。 剂量应该由特定的本发明物质的功效和待治疗的动物 (例如人) 的状 况, 以及动物 (例如人) 的体重所确定。 确定施用剂量的许多测定方
法是本领域内己知的。 本领域普通技术人员应该容易理解, 本发明物 质可以以任何方式修饰, 以提高本发明物质的治疗或预防功效。 例如, 本发明物质可以直接或通过连接体间接与靶向的部分缀合。 使化合物 例如本发明物质与靶向部分缀合的实践, 在本领域内是公知的 (参见, 例如美国专利号 5,087,616 ) 。 在另一个实施方案中, 本发明物质可以 被修饰成贮存库形式, 以便使本发明物质释放到其所施用的体内的方 式在时间和体内部位方面受到控制(参见,例如美国专利号 4,450,150 )。 本发明物质的贮存库形式可以是例如包括本发明物质和多孔或非多孔 物质如聚合物的可植入组合物, 其中本发明物质通过所述物质和 /或 所述非多孔物质的降解而扩散。 然后, 将贮存库植入体内的理想部位, 并且本发明物质以预先确定的速率从所述植入物释放。 本领域技术人员应该理解, 本发明提供的预防和治疗肿瘤, 脂肪 肝或肥胖的方法, 包括使患病细胞与具有有效抑制量的本发明所述的 任意药物组合物接触。 可以采用任意常规的方法将本发明所述药物组 合物传递给患病细胞。 在本发明方法的一个优选的实施方案中, 将所 述药物组合物通过局部施用给宿主。 在另一个优选的实施方案中, 所 述药物组合物直接施用到患病细胞, 例如, 对于肿瘤细胞采取肿瘤内 递送。 本发明的药物组合物, 包含多肽 (包括功能片段和功能变体) 以 及肽模拟物、 核酸、 重组表达载体、 和 /或宿主细胞, 可以用在预防和 治疗肿瘤, 脂肪肝和肥胖等病症的方法中。 本领域普通技术人员应该 容易理解, 本发明所述的上述病症可以存在于任何宿主中。 优选地, 所述宿主是哺乳动物。 特别优选地, 所述宿主是人。 下面结合具体实施例, 对本发明作进一步的阐述说明。 应理解, 这些实施例仅用于说明本发明而不在于限制本发明的范围。 下述实施 例中的实验方法, 如无特殊说明, 均为常规方法; 所用的材料, 如无 特殊说明, 均为自常规生化试剂公司购买得到的。
实施例一: 多肽的设计和制备
人工合成多肽功能片段 Anti-FAS-P18:
本 发 明 用 人 工 合 成 的 方 法 合 成 了 氨 基 酸 序 列 为 Gly-Gly-Cys-Arg-His-Lys-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys-Asn-Phe-Ph e-Thr ( SEQ ID NO: 1 ) 的多肽 (以下称 Anti-FAS-P18 ) 。 该多肽的制 备采用固相合成方法, 如应用 AAPPTECApex396型多肽合成仪器 (购 自香港环球分析测试仪器有限公司) , 在密闭的防爆玻璃反应器中使 氨基酸按 SEQ ID NO: 1所示的序列, 从 C端-羧基端向 N端-氨基端合 成 , 这 是 指 第 一 个 被 加 入 到 该 氨 基 酸 序 列
Gly-Gly-Cys-Arg-His-Lys-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys-Asn-Phe-Ph e-Thr的氨基酸单体是 C末端的 Thr, 然后再是 Phe, 再是 Phe, 一直到 最后的 Gly以及 N末端的 Gly, 不断添加、 反应、 合成、 操作, 最终 得到所要的氨基酸序列。 固相合成法, 大大的减轻了每步产品提纯的 难度。 为了防止副反应的发生, 参加反应的氨基酸的侧链都是受保护 的。 羧基端是游离的, 并且在反应之前必须活化。 具体合成由下列几个循环组成:
1 ) 去保护: Fmoc 保护的柱子和单体必须用一种碱性溶剂 (piperidine) 去除氨基的保护基团。
2 ) 激活和交联: 下一个氨基酸的羧基被一种活化剂所活化。 活 化的单体与游离的氨基反应交联, 形成肽键。 在此步骤使用大量的超 浓度试剂驱使反应完成。 循环: 这两步反应反复循环直到合成完成。
3 ) 洗脱和脱保护: 多肽从柱上洗脱下来, 其保护基团被一种脱 保护剂 (TFA) 洗脱和脱保护。 从 C端 (羧基端) 向 N端 (氨基端) 合成, 把 C端的第一个氨基酸 Thr固定在树脂上, 脱去 Thr氨基酸的 保护基团, 并活化下一个氨基酸 Phe 的羧基端, 使之发生缩和反应, 以此类推到合成完最后一个氨基酸后, 从树脂上切割下来, 粗肽经 HPLC纯化, 获得 98%纯度的 Anti-FAS-P18, 最后通过质谱做进一步的 鉴定, 其分子量为 1921.6 Kd。
在固相合成中, 肽链的延长是在不溶性的聚苯乙烯树脂载体上进 行的。 合成多肽的 C-末端先和氯甲基聚苯乙烯树脂 (氯化苄酯树脂) 反应形成苄酯, 然后按肽链一级结构的顺序将氨基端已被保护的氨基 酸逐个加上去, 使肽链延长。 人工合成多肽 Anti-FAS-P18用高压液相色谱(HPLC) (应用 PLC Agela C18柱) 分析, 显示所获得的纯度为 98.11% (图 1 ) 。 实施例二: 离体 (in vitro) 多肽的抗 FAS活性
采用两种方法检测离体情况下实施例一中的多肽的抗 FAS 的活 性: 第一种方法是采用分子克隆技术, 将表达实施例一中的多肽的 cDNA 克隆进真核表达载体 pcDNA3.1 ( + ) 上, 通过基因转染, 在肝 癌细胞内实现表达所研究多肽的目的,进而观察所研究的多肽抑制 FAS 的效果; 第二种方法是采用人工合成的多肽, 直接加入到培养肝癌细 胞的培养液中, 观察多肽抑制 FAS的效果。 实验中采用的细胞为肝癌 HepG2细胞。 由于 SREBP-lc为 FAS的上 游转录调控因子, 通过荧光素酶报告基因检测方法, 在分子水平检测 SREBP-lc的启动子活性是否受到抑制, 可反映 FAS的基因转录情况。 同时, 检测 FAS启动子活性, 可直接反映 FAS的转录是否受到抑制; 核 因子 κΒ ( nuclear factor κΒ, NF-κΒ ) 是一个重要的转录因子。 NF-κΒ启 动子活性增强意味着细胞增殖加快。 因此, 检测 NF-κΒ启动子的活性, 可反映细胞增殖情况。 因此, 通过 NF-κΒ启动子活性检测和 3-(4,5-二甲 基 -2-噻唑) -2,5-二苯基四氮唑溴盐 (MTT) 检测实施例一中的多肽对上 述 HepG2细胞增殖的影响。
A.多肽真核表达载体的构建
1.主要材料:
1 ) 菌株: . co/ DH5„ (购自原平皓 (天津) 生物技术有限公司)
2 ) 质粒: pcDNA3.1 ( + ) (购自 Invitrogen) , pEGFP-C2 (购自 Invitrogen)
2.主要试剂
试剂名称 来源 (公司名称, 地址) 琼脂糖 Solarbio , 中国北京 质粒小提试剂盒 Transgen, 中国北京
氨节青霉素 BBI, 美国波士顿生物技术公司 胰蛋白酶 BBI, 美国波士顿生物技术公司 胰蛋白胨 Promega, 美国 酵母提取物 Promega, 美国
EcoRI内切酶 Takara, 中国大连
Xhol内切酶 Takara, 中国大连 rTaq酶 Takara, 中国大连
T4 DNA 连接酶 Takara, 中国大连
氯仿 BBI, 美国波士顿生物技术公司
3.主要溶液配制:
1 ) LB液体培养基
胰化蛋白胨 2.0g
酵母提取物 l .Og
NaCl 2.0g
加双蒸水溶解定容至 200ml
1.03 X 105 Pa 蒸汽灭菌 20min。
2 ) LB固体培养基
胰化蛋白胨 2.0g
酵母提取物 l .Og
NaCl 2.0g
琼脂粉 3.0g
双蒸水溶解定容至 200ml
1.03 X 105 Pa 蒸汽灭菌 20min。
3 ) lOmg/ml溴化乙锭
溴化乙锭 0.2g
双蒸水 20ml
工作液: 0.5ug/ml
4 ) TBE电泳缓冲液
5 X贮存液:
Tris 碱 54 g
硼酸 27.5 g
0.5 mol/L EDTA ( H 8.0) 20 ml
加双蒸水定容至 1000 ml
4.退火体系
试剂 加入量 ( μΐ) 灭菌双蒸水 20
5 Annealing Buffer 10
Forward DNA oligo (50 μΜ) 10 (5'-AATTCATGGGAGGCTGTAGGCATAAATTGGTCTGCGC
ACCAGCACCATGCAACTTTTTCACCTGAC-3 ' )
(SEQ ID NO:13)
Reverse DNA oligo (50 μΜ) 10 ( 5 '-TCGAGTCAGGTGAAAAAGTTGCATGGTGCT
GGTGCGCAGACCAATTTATGCCTACAGCCTCCCATG-3 ' )
(SEQ ID NO: 14)
5.退火条件: 95 °C, 2分钟; 每 8秒下降 0.1 °C至 25 °C, 90分钟; 4°C, ∞。
6. pcDNA3.1 ( + ) 空质粒载体的小量提取
将含有 pcDNA3.1 ( + ) 质粒的 DH5a菌株 (购自原平皓 (天津) 生物技术有限公司)进行活化,挑取单克隆,加入 LB液体培养基中(含 氨苄霉素 100 mg/L) 37°C过夜培养。 使用 TransGen的质粒小提试剂盒
提取质粒。
7. 双酶切反应体系:
试剂 加入量 ( μΐ)
限制性内切酶 EcoR l 2
限制性内切酶 Xhol 2
10 M buffer 4
DNA 小于 2 μδ
ddH2O 使总体积为 40 μΐ 混匀后, 37°C反应 3-6小时。
8.连接反应体系:
试剂 加入量 ( μΐ) 退火产物 0.3 pmol
质粒双酶切回收产物 0.03 pmol
10 连接缓冲液 2.5 μΐ
连接酶 1 μΐ
ddH2O 使总体积为 25 μΐ 混匀后 16°C反应过夜。 合成碱基序列包括 ggaggctgta ggcataaatt ggtctgcgca ccagcaccat gcaacttttt cacc ( SEQ ID NO: 7 ) , 连接示意图如图 12所示。
9.转化步骤
1 ) 将 DH5a感受态菌株 (100 μΐ) 在冰上解冻;
2 ) 在超净台中将步骤 8中的 25 μΐ连接产物全部加入含有感受态 细菌的离心管中, 用枪头混匀, 冰上静置 30分钟;
3 ) 将离心管放入 42°C水浴中准确热激 90秒;
4 ) 立即放入冰上静置 2分钟;
5 ) 向离心管中加入 500 μΐ无抗性 LB液体培养基, 37°C预培养 45分钟;
6 ) 取 100 μΐ菌液 (可根据形成克隆的密集程度做适度调整) 均 匀涂布于 LB固体培养板上(含氨苄霉素 100 mg/L) , 待液体渗入培养 基后, 倒置 37°C培养过夜;
7 ) 待平板上长出清晰可见的单克隆菌斑之后, 用接菌针小心挑 取独立的单克隆在 LB液体培养基中 37°C培养过夜。
10.菌落 PCR反应体系
试剂 加入量 ( μΐ) 灭菌双蒸水 35.75
10 buffer 5 dNTP ( 10mmol/L) 4
Forward Primer (20 μΜ) 1
5 '-TAATACGACTCACTATAGGG-3 ' (SEQ ID NO: 15)
Reverse Primer (20 μΜ) 1
5 ' -TAGAAGGCACAGTCGAGG-3 ' (SEQ ID NO: 16)
模板 DNA (菌液) 3
Taq 酶 0.25
11.菌落 PCR反应条件:
94 °C 10分钟
94 °C ' 30秒 、
53 °C -< 30秒 35个循环
72 °C . 15秒 .
72 °C 10分钟
4°C oo
反应完毕后取反应产物在 1.5%琼脂糖凝胶中进行电泳分析。 将阳 性克隆送交生物公司进行测序。 并将该质粒命名为 p-Anti-FAS-P18。
B . 体外有效性实验
1. 细胞系:
实验中应用的肝癌 HepG2 细胞系购自上海劲马生物科技有限公 司。
2.主要试剂
试剂名称 来源
RPMI1640培养液 Gibco
DMEM培养液 Gibco
Lipofectamine 2000 Invitrogen 青链霉素 Solarbio
胰蛋白酶 BBI 胎牛血清 Hyclone
3.双荧光素酶报告基因分析
(1) 将对数生长期的细胞(为上述表 1中列举的细胞)以 0.75x 105 个 /ml 的密度接种于 24孔细胞培养板, 每孔接种 500μ1细胞, 当细胞 汇合至 90%时进行基因转染。
(2) 启 动 子 报 告 基 因 载 体 ( SREBP-lc-571-Luc-WT , pFAS-WT-Luc, pGL3-NF-KB , 各 0.3 μ g, 可购自原平皓 (天津) 生物 技术有限公司) 分别以脂质体法转染至细胞同时以海肾荧光素酶表达 载体 (pRL-TK, 0.1 μ g, 购自 Promega公司) 为内参。 同时转染不同 质量的由步骤 A得到的多肽质粒 (0.5 w g, 1.0 u g 2.0 μ g/孔) 或 加入不同浓度的由实施例 1获得的合成多肽 (1 μ Μ, 10 μ Μ和 100 μ Μ) , 每个浓度重复 3个孔。
(3) 在转染后 48小时(或应用人工合成多肽 Anti-FAS-P18及其变 异体作用后 24小时) , 用 PBS将细胞洗 3次。
(4) 向每孔转染的细胞加入 100 μΐ I X Passive Lysis Buffer (PLB ) , 于室温下作用 15 min使细胞充分裂解, 用细胞刮子将细胞 裂解物刮下来, 转入 1.5 ml Eppendorf (EP) 管中。
(5) 12,000 rpm 离心 30 min, 将上清吸入新的 EP管中。
(6) 向每个装有 100 μΐ 荧光素酶测定缓冲液 (Luciferase Assay
Buffer II, LARII) 的 EP管中加入等量细胞裂解液, 混匀。
(7) 立即将 EP管放入生物化学发光检测仪(Turner Biosystems公 司产品) , 2 sec平衡后, 测定 10 sec后的光输出。
(8) 加入 100 μΐ荧光淬灭剂, 淬灭萤火虫荧光素酶同时启动海肾 荧光素酶反应。
(9) 测定 lOsec后的光输出。 第一次的荧光数值与第二次荧光数值的比值为相对活性。 每组实验均作 3次独立重复, 以 Mean± SD作为统计依据, 进行
Student's t test统计学分析。 如图 2所示, p-Anti-FAS-P18对 HepG2细胞中 SREBP-lc和 FAS 启动子的活性具有抑制作用, 呈剂量依赖性, 表明本发明的多肽基因 表达产物具有抑制 FAS基因表达转录的作用。 * P<0.05, ** P<0.01, 进行 Student's t test统计学分析。 如图 3所示,人工合成的多肽 Anti-FAS-P18对肝癌 HepG2细胞中 SREBP-lc和 FAS启动子的活性具有抑制作用,且该抑制作用呈剂量依 赖性, 表明本发明的多肽具有抑制 FAS基因表达转录的作用。 100 μΜ 的本发明多肽 Anti-FAS-P18的变异体 P18-1至 P18-5对 SREBP-lc和 FAS启动子的活性有不同程度的抑制作用。 * P<0.05, ** P<0.01, 进行 Student's t test统计学分析。 4.免疫印迹检测
1 ) 样品制备
分别取长至 90%的单层培养的细胞, 用预冷的 PBS洗 3次; 加入适量 0.25%胰蛋白酶溶液消化细胞, 待细胞质回缩, 细胞间 隙增大时, 弃掉胰蛋白酶溶液, 用预冷的 PBS洗 3次;
加入 10ml 预冷的 PBS, 吹打成细胞悬液, 转入离心管中, 4000rpm/min, 4°C 离心 10min, 收集细胞。 用预冷的 PBS洗 2次;
彻底去除上清, 加入适量细胞裂解液 (8M urea, 4 % CHAPS , 2 % Pharmalyte 3-10 )并加入 Protease Inhibitor Cocktail,室温作用 30min;
13000rpm, 4°C 离心 15min, 取上清, 转入新的 Eppendorf管中, -70°C保存。
2 ) 蛋白质浓度测定一考马斯亮蓝染色法
考马斯亮蓝染色液: 含 0.01%(W/V)G-250, 4.7%(W/V)乙醇, 8.5%(W/V)磷酸;
标准蛋白质溶液:结晶牛血清白蛋白(BSA),用 PBS配制成 2mg/ml 蛋白溶液;
制定标准曲线: 取 6支试管, 按下表操作:
试管编号 0 1 2 3 4 5
PBS/μΙ 100 90 80 70 60 50
2mg/ml BSA/μΙ 0 10 20 30 40 50 考马斯亮蓝染色液 3ml
A595 nm
摇匀, 放置 10-15 min, 40 min内以 0号管为空白对照, 在 595nm 处比色。 以 A595nm为纵坐标, 标准蛋白含量为横坐标, 在坐标纸上绘制 标准曲线。
测定样品浓度
另取 4支试管, 按下表操作:
试管编号 6 (样品 A) 7(样品 A) 8 (样品 B) 9 (样品 B)
PBS/μΙ 95 90 95 90
样品 /μΐ 10 10 10 10
考马斯亮蓝染色液 3ml
A595nm
摇匀, 放置 10-15 min, 在 595nm处比色。 测定方法同上, 取合适的蛋白样品体积, 使其测定值在标准曲线 的直线范围内, 根据测定的值, 在标准曲线上査出其相当于标准蛋白 的量, 从而计算出样品的蛋白质浓度。
) 分离胶的选择
蛋白质分子量大小 分离胶浓度
60-200 kDa 5%
40-100 kDa 8%
16-70 kDa 10%
15-60 kDa 12%
12-45 kDa 15% 按下表分别配制分离胶和浓缩胶, AP和 TEMED最后再加。 分离胶 (ml) 浓缩胶 (ml) 试剂
5% 8% 10% 12% 15% 5%
30%凝胶储备液 1 2 3 4 5 0.83 分离胶缓冲液 (3MTris-HCl) 1.25 1.25 1.25 1.25 1.25 - 浓缩胶缓冲液 (0.5MTris-HCl) - - - - - 1.26
10%SDS 0.1 0.1 0.1 0.1 0.1 0.05 重蒸水 7.55 6.55 5.55 4.55 3.55 2.81
10%AP 0.1 0.1 0.1 0.1 0.1 0.05
1%TEMED 0.004 0.004 0.004 0.004 0.004 0.005
分离胶溶液加至电泳板中, 在上面铺上水层, 以隔绝空气。 待凝 固后, 倾去上面的水层。 迅速加入浓缩胶, 小心插入梳子, 避免混入 气泡。 待浓缩胶聚合完全后, 在电泳槽中加入电泳缓冲液, 小心移出 梳子。 取细胞裂解液与溴酚蓝以 4:1比例混匀上样, 进行稳压电泳 (浓 缩胶, 100V; 分离胶, 200V) 。
4 ) 电转移
根据凝胶大小剪取 6张滤纸和 1张 PVDF膜, 使其大小和凝胶的 大小完全相等或略小于凝胶;
PVDF膜先在甲醇中浸泡 10-15秒, 再在纯水中浸泡 2min, 然后 在转移缓冲液中浸泡平衡 15分钟; 滤纸浸泡于转移缓冲液中;
在湿转移电泳槽上, 由阴极到阳极安装转移装置: (- ) 海绵垫- 滤纸 (双层) -凝胶 -PVDF膜-滤纸-海绵垫 (+ ) ; 并且用玻璃棒仔细去 除气泡。 PVDF膜的一侧靠近正极, 要保持膜是湿润的。 恒压电泳 90V 电转移 90 min;
转移后, 在滤膜左下角剪口做标记, 并转移到丽春红染液中 5-10 min, 其间轻轻摇动染液。蛋白带出现后, 于室温用去离子水漂洗滤膜, 其间换水数次;
同时, 可将凝胶转移到考马斯亮蓝染液中染色;
5 ) 免疫印迹
封闭: 将 PVDF膜浸泡于 5%牛奶封闭液中, 室温摇动 lh, 或 4°C 静置过夜;
加一抗 (兔抗脂肪酸合成酶多克隆抗体, 购自美国 Cell Signaling 公司) 。 准备塑料袋, 将滤膜放入其中, 稀释好的一抗加在滤膜上表 面 (0.1ml/cm2) 。 赶气泡, 封口。 室温摇动 2h;
冲洗。 用 0.1%Triton X-100 PBS液洗滤膜, 共 4次, 每次 15min; 加辣根过氧化物酶标记的二抗 (广谱二抗, 购自天津津脉公司) 。 准备塑料袋, 将滤膜放入其中, 稀释好的二抗加在滤膜上表面 ( 0.1ml/cm2) 。 赶气泡, 封口。 室温摇动 2h;
冲洗。 如步骤 3 ) ;
取等量 ECL A、 B液 (购自北京全式金公司) , 混匀, 将混和液 加于膜上反应 2-3 min;
暗室曝光。 在暗盒内依次放上保鲜膜、 滤膜、 保鲜膜, 固定。 黑 暗中, 再将 X光片置于膜上, 曝光 3-5min;
曝光完毕, 将 X光片在显影液中浸泡 3-5min, 待出现暗带时, 于 自来水下冲洗;
将 X光片在定影液中浸泡 3-5min, 自来水冲洗, 晾干保存, 并拍 昭 .
八、、? 如图 4所示, p-Anti-FAS-P18对 HepG2细胞中 FAS蛋白表达水 平具有抑制作用, 且该抑制作用呈剂量依赖性。 如图 5所示,人工合成的多肽 Anti-FAS-P18 HepG2细胞中 FAS 蛋白表达水平具有抑制作用, 且该抑制作用呈剂量依赖性。
5.MTT检测
(1) 接种细胞: 将对数生长期的细胞 (为表 1 中列举的细胞) 用 含 10%胎牛血清的 RPMI1640或 DMEM培养液配成单个细胞悬液, 以 每孔 4000-5000个细胞接种到 96孔细胞培养板中, 每孔体积 100 ul。
(2) 培养细胞: 待 12h后细胞贴壁, 转染不同质量的在本实施例 的步骤 B中所获得的多肽质粒 (0.3 g, 0.5 g n 1.0 g/孔) 或加入 不同浓度的在实施例 1 中所获得的合成多肽及其变异体 (Ι .Ο μ Μ, 10 μ Μ和 ΙΟΟ μ Μ/孔) , 每个浓度重复 8个孔, 同一般培养条件, 培养 48h。 将 0.3 u g pEGFP-C2质粒与 0.3 μ g p-Anti-FAS-P18 混合后共转 染, 24 小时后在倒置荧光显微镜下观察绿色荧光, 确定其转染效率可 达到 70%。
(3) 呈色: 每孔加 MTT溶液 (5 mg/ml, 用 PBS <pH=7.4>配) 20 μ 1.
(4) 继续孵育 4 小时, 终止培养, 小心吸弃孔内培养上清液。 每
孔加 150ulDMSO, 振荡 10分钟, 使结晶物充分融解。
(5) 比色: 选择 490 nm波长, 在酶联免疫监测仪上测定各孔光吸 收值, 记录结果, 进行 Student's t test统计学分析。 如图 6所示, p-Anti-FAS-P 18对 HepG2细胞中 NF-κΒ启动子的 活性具有抑制作用, 呈剂量依赖性, 表明肝癌细胞的增殖能力下降。 * P<0.05, ** P<0.01, 进行 Student's "est统计学分析。 如图 7所示, Anti-FAS-P18对 HepG2细胞中 NF-κΒ启动子的活 性具有抑制作用, 且呈剂量依赖性, 表明肝癌细胞的增殖能力下降。
100 μΜ的本发明多肽 Anti-FAS-P18的变异体 P18-1至 P18-5对 NF-KB 的活性也有不同程度的抑制作用。 * P<0.05, ** P<0.01, 进行 Student's t test统计学分析。 实施例三: 动物体内 (in vivo) 多肽有效性实验
将对数生长期的 HepG2细胞用胰酶消化制成细胞悬液, 计算细胞 数, 用无菌的生理盐水细胞稀释至 IX 107 个细胞 /ml, 置冰水中存放。 再取 12只 4到 6周雌性 BALB/C裸鼠, 将小鼠随机分为 2 组: ①对照 组, 在每只小鼠右前肢腋下皮下注射上述稀释后的细胞 0.2 ml, 仅注 射 0.5 ml灭菌蒸馏水(不含多肽药物);②实验组(给药剂量为 10 mg/kg 体重) 。 在每只小鼠右前肢腋下皮下注射上述稀释后的细胞 0.2 ml, 注射 7天后, 肿瘤体积 (V=LXW2X 0.5) 达到 100mm3, 再分别皮下 注射上述多肽药物(用 0.5ml灭菌蒸馏水溶解冻干的多肽药物) , 每两 天注射一次,共注射 10次,每次注射前测量肿瘤体积。末次给药 24 小 时后, 称量小鼠的体重, 然后将小鼠脱颈椎处死, 剥取瘤体组织称重, 按下列公式计算抑瘤率。 对照组平均瘤重-实验组平均瘤重
抑瘤率 = xl 00%
对照组平均瘤重
如表 1和图 10所示, 动物实验检测结果表明, 应用人工合成的多 肽 Anti-FAS-P18对 HepG2细胞的生长和增殖具有抑制作用。 ** P<0.01, 进行 Student's t test统计学分析。 如图 11所示, 动物实验检测结果表明, 与对照组相比, 应用人工 合成的多肽 Anti-FAS-P18对裸鼠体重无明显影响。进行 Student's t test 统计学分析。 表 1 : 人工合成的多肽 Anti-FAS-P18对 HepG2细胞的作用:
实施例四: 多肽的功能片段及变体
本发明还探讨了多肽及其功能片段的功能变体的作用。 下表所示 的序列为以 Anti-FAS-P18为基础进行氨基酸添加 (例如在端侧添加一 个氨基酸) 或保守氨基酸置换 (例如用一个氨基酸置换另一个相同类 型的氨基酸) 而得到的。 按照所述序列进行人工合成多肽片段 (方法 如上) , 然后, 采用上述报告基因和 MTT检测的方法, 观察所得的多 肽的作用的变化。 合成多肽片断 氨 基 酸 序 列 SEQ ID NO.
Anti-FAS-P18 Gly-Gly-Cys-Arg-His-Lys-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys-Asn-Phe-Phe-Thr 1 (P18) 或 G-G-C-R-H-K-L-V-C-A-P-A-P-C-N-F-F-T
Anti-FAS-P18-1 Val-Gly-Gly-Cys-Arg-His-Lys-Leu-Val-Cys-Ala-Pro-Ala -Pro-Cys-Asn-Phe-Phe-Thr 2 (P18-1) 或 V-G-G-C-R-H-K-L-V-C-A-P-A-P-C-N-F-F-T
Anti-FAS-P18-2 Ile-Gly-Gly-Cys-Arg-His-Lys-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys-Asn-Phe-Phe-Thr 3 (PI 8-2) 或 I-G-G-C-R-H-K-L-V-C-A-P-A-P-C-N-F-F-T
Anti-FAS-P18-3 Gly-Gly-Cys-Lys-His-Lys-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys-Asn-Phe-Phe-Thr 4 (PI 8-3) 或 G-G-C-K-H-K-L-V-C-A-P-A-P-C-N-F-F-T
Anti-FAS-P18-4 Gly-Gly-Arg-Arg-His-Lys-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys-Asn-Phe-Phe-Thr 5 (PI 8-4) 或 G-G-C-R-R-K-L-V-C-A-P-A-P-C-N-F-F-T
Anti-FAS-P18-5 Gly-Gly-Cys-Arg-His-His-Leu-Val-Cys-Ala-Pro-Ala-Pro-Cys-Asn-Phe-Phe-Thr 6
(PI 8-5) 或 G-G-C-R-H-H-L-V-C-A-P-A-P-C-N-F-F-T
合成多肽片断 核苷酸序列 SEQ ID NO.
Anti-FAS-P18 ggaggctgta ggcataaatt ggtctgcgca ccagcaccat gcaacttttt cacc 7 (P18)
Anti-FAS-P18-1 gtcggaggct gtaggcataa attggtctgc gcaccagcac catgcaactt tttcacc 8 (P18-1)
Anti-FAS-P18-2 atcggaggct gtaggcataa attggtctgc gcaccagcac catgcaactt tttcacc 9 (PI 8-2)
Anti-FAS-P18-3 ggaggctgta aacataaatt ggtctgcgca ccagcaccat gcaacttttt cacc 10 (PI 8-3)
Anti-FAS-P18-4 ggaggctgtc atcataaatt ggtctgcgca ccagcaccat gcaacttttt cacc 11 (PI 8-4)
Anti-FAS-P18-5 ggaggctgta ggcatcattt ggtctgcgca ccagcaccat gcaacttttt cacc 12 (PI 8-5) 如图 3, 图 7 和图 9所示, 本发明的多肽 Anti-FAS-P18的功能变 体对 SERBP-lc、 FAS和 NF-κΒ的启动子活性和肝癌 HepG2细胞的增 殖有不同程度的抑制作用。 实施例五: 多肽药物急性毒性试验
取昆明小白鼠,每组 10只,每组雌雄各 5只。分实验组和对照组。
实验组, 以 lg/kg的浓度从小鼠尾静脉单次注射多肽 Anti-FAS-P18 (用
0.125 ml灭菌蒸馏水溶解冻干的 2.5 mg多肽) ; 对照组注射 0.25 ml灭 菌蒸馏水。 注射后连续观察 24小时。 多肽药物急性毒性试验结果显示, 小鼠无异常表现。 与对照组相 比体重无异常变化。 本发明引用的所有参考文献, 包括出版物、 专利申请、 和专利, 通过引用结合于此, 并且完全结合于此。 本文提供的任何以及所有实 施例, 或示例性语言 (例如、 诸如等) 仅意欲更好地阐述本发明, 并 不形成对本发明范围的限制, 除非另外要求。 本发明描述了优选实施 方案, 包括本发明人已知实施本发明的最佳模式。 本发明包含这些优 选实施方案可能的变化, 本发明人意欲以这些与本文具体描述不同的
方式实施本发明, 同样, 本领域普通技术人员也清楚了解这些变化, 并预期能熟练地利用所述变化。 在法律所能允许的范围, 本发明包括 了在所附权利要求中引用的主题的所有修改和等价物, 除非本文另外 指明, 或明显与上下文相抵触。
序列表
<110> 天津托普泰克生物科技有限公司 <120> 抗脂肪酸合成酶多肽及其应用
<130> PCnQ217CN
<160> 16
<170> F¾t ent I n ver si on 3.3
<210> 1
<211> 18
<212> PRT
<213> 多肽
<400> 1
Qy Qy Q^s A-g H s Lys Leu Val C s Λ a o Λ a o C s ^sn Fhe 1 5 10 15
Fhe T r
<210> 2
<211> 19
<212> PRT
<213> 多肽
<400> 2
Val Q y Q y Q^s A-g H s Lys Leu Val (^s Λ a o Λ a o (^s ^sn 1 5 10 15
Fhe Fhe T r
<210> 3
<211> 19
<212> PRT
<213> 多肽
<400> 3
11 e Q y Q y Cys A-g H s Lys Leu Val Q^s Λ a o Λ a o Q^s ^sn 1 5 10 15
6ε
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91- siy s/t) O^J B ^ O^J B ^ S/Q ηθη s H s H 6- s/t) A D A D
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<212>
<213> 人工序列
<400> 7
ggaggct gt a ggcat aaat t ggt ct gcgca ccagcaccat gcaact t t t t cacc 54
<210> 8
<211> 57
<212> C
<213> 人工序列
<400> 8
gt cggaggct gt aggcat aa at t ggt ct gc gcaccagcac cat gcaact t 111 cacc 57
<210> 9
<211> 57
<212>
<213> 人工序列
<400> 9
at cggaggct gt aggcat aa at t ggt ct gc gcaccagcac cat gcaact t t t t cacc
<210> 10
<211> 54
<212>
<213> 人工序列
<400> 10
ggaggct gt a aacat aaat t ggt ct gcgca ccagcaccat gcaact t t t t cacc 54
<210> 11
<211> 54
<212> r
<213> 人工序列
<400> 11
ggaggct gt c at cat aaat t ggt ct gcgca ccagcaccat gcaact t t t t cacc 54
<210> 12
<211> 54
<212> cm
<213> 人工序列
<400> 12
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Claims
1. 分离的多肽或肽模拟物,其包含如 SEQ ID NO: 1所示的氨基酸 序列、 或其功能片段或功能变体, 所述多肽或肽模拟物具有抑制脂肪 酸合成酶的功能, 并能抑制肿瘤、 脂肪肝和肥胖的发生和发展。
2. 权利要求 1所述的多肽或肽模拟物, 所述肿瘤包括肝癌。
3. 权利要求 1所述的多肽或肽模拟物, 其包含与 SEQ ID NO: 1 所示的氨基酸序列具有至少 80%的相同性的氨基酸序列。
4. 权利要求 1所述的多肽或肽模拟物, 其包含与 SEQ ID NO: 1 所示的氨基酸序列具有至少 90%的相同性的氨基酸序列。
5. 权利要求 1所述的多肽或肽模拟物, 其包含与 SEQ ID NO: 1 所示的氨基酸序列具有至少 95%的相同性的氨基酸序列。
6. 权利要求 1所述的多肽或肽模拟物, 其包含由 SEQ ID NO: 1 所示的氨基酸序列经过一个氨基酸的保守置换或在其端侧添加或缺失 一个氨基酸而得到的氨基酸序列。
7. 权利要求 1所述的多肽或肽模拟物,其包含如 SEQ ID NOs: 1-6 所示的任一种氨基酸序列。
8. 分离的多核苷酸, 所述多核苷酸包含选自下组中的一种: a) 编码如 SEQ ID NO: 1所示的氨基酸序列、 或其功能片段或功 能变体的多核苷酸; 或者
b) 与多核苷酸 a)互补或严格杂交的多核苷酸。
9. 权利要求 8的多核苷酸,所述多核苷酸包含选自下组中的一种: a)编码如 SEQ ID NOs: 1-6所示的任一种氨基酸序列的多核苷酸; 或者
b) 与多核苷酸 a)互补或严格杂交的多核苷酸。
10. 重组表达载体, 其包含权利要求 8或 9所述的多核苷酸。
11. 包括权利要求 10所述的重组表达载体的宿主细胞。
12. 权利要求 1-7任一项所述的多肽在制造抗肿瘤、脂肪肝和肥胖 的药物中的应用。
13. 权利要求 8-9任一项所述的核苷酸在制造抗肿瘤、脂肪肝和肥 胖的药物中的应用。
14. 权利要求 10所述的重组表达载体在制造抗肿瘤、 脂肪肝和肥 胖的药物中的应用。
15. 药物组合物,其包含权利要求 1-7任一项所述的多肽或肽模拟 物, 以及任选的药物载体。
16. 药物组合物, 其包含权利要求 8-9任一项所述的多核苷酸, 以 及任选的药物载体。
17. 药物组合物, 其包含权利要求 10所述的重组表达载体, 以及 任选的药物载体。
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