WO2013163858A1 - 一种脂肽及其衍生物、及其制备方法和应用 - Google Patents

一种脂肽及其衍生物、及其制备方法和应用 Download PDF

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WO2013163858A1
WO2013163858A1 PCT/CN2012/081556 CN2012081556W WO2013163858A1 WO 2013163858 A1 WO2013163858 A1 WO 2013163858A1 CN 2012081556 W CN2012081556 W CN 2012081556W WO 2013163858 A1 WO2013163858 A1 WO 2013163858A1
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lipopeptide
derivative
expression
staphylococcus epidermidis
present
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PCT/CN2012/081556
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English (en)
French (fr)
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李冬青
雷虎
李红泉
赖玉平
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华东师范大学
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07KPEPTIDES
    • C07K5/00Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof
    • C07K5/04Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing only normal peptide links
    • C07K5/10Tetrapeptides
    • C07K5/1002Tetrapeptides with the first amino acid being neutral
    • C07K5/1005Tetrapeptides with the first amino acid being neutral and aliphatic
    • C07K5/101Tetrapeptides with the first amino acid being neutral and aliphatic the side chain containing 2 to 4 carbon atoms, e.g. Val, Ile, Leu
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/54Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic compound
    • A61K47/542Carboxylic acids, e.g. a fatty acid or an amino acid
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00Cosmetics or similar toiletry preparations
    • A61K8/18Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/64Proteins; Peptides; Derivatives or degradation products thereof
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/04Antibacterial agents
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61QSPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q17/00Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
    • A61Q17/04Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07KPEPTIDES
    • C07K14/00Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/195Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria
    • C07K14/305Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Micrococcaceae (F)
    • C07K14/31Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Micrococcaceae (F) from Staphylococcus (G)
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00Medicinal preparations containing peptides

Definitions

  • the invention relates to the field of bioengineering technology, in particular to a lipid raft and a derivative thereof for improving the antibacterial ability of a host, and a preparation method and application thereof.
  • Background Art Since the advent of penicillin in the 1930s and 1940s, many antibiotics such as cephalosporins, aminoglycosides, macrolides, and tetracyclines have been discovered. Antibiotics play an important role in the treatment of human microbial infections. However, there are more and more microbial resistant strains, and many antibiotics no longer have a good therapeutic effect on microbial infections. Therefore, the search for antibiotic substitutes has become an increasingly urgent task for human beings.
  • the lipopeptide is composed of a hydrophilic peptide chain and a lipophilic fatty acid chain, that is, a cyclic or linear lipopeptide formed by about 10 polypeptides and fatty acid chains. Lipopeptides are primarily derived from secondary metabolites of microorganisms that exhibit a variety of biological activities.
  • MRSA methicillin-resistant Staphylococcus aureus
  • VRE vancomycin-resistant Enterococcus faecium
  • the skin is the body's first line of defense against the external environment, and a variety of bacteria are found on the surface of the skin.
  • Staphylococcus aureus belongs to the genus Staphylococcus and is a harmful bacterium that usually causes infection in humans.
  • the diseases caused by Staphylococcus aureus are the three most common types: ⁇ It is a purulent infection in the human body; Second, it is a hospital infection, a wound purulent infection is caused by contaminated equipment supplies, a suppurative infection at the injection site, or bronchitis, pneumonia, etc.
  • Staphylococcus epidermidis is a symbiotic bacterium of the genus Staphylococcus, but it has been reported in the literature that the fermentation broth of Staphylococcus epidermidis can inhibit the infection of Staphylococcus aureus (Lai % Cogen AL, Radek KA, et a!. Of TLR2 by a small molecule produced by Staphylococcus epidermidis increases antimicrobial defense against bacterial skin infections, ,) Invest Dermatol, 2010, 130(9): •2 —I—I ⁇ 1. Summary of the invention
  • the present invention discloses a lipopeptide and a derivative thereof, and a preparation method and application thereof.
  • the lipopeptide is obtained by extracting from the fermentation broth of Staphylococcus epidermidis, and can induce the expression of defensin in the skin keratinocytes in a large amount, and has a good effect of inhibiting the infection of Staphylococcus aureus.
  • One of the objects of the present invention is to provide a lipopeptide comprising a peptide chain and a fatty chain, the peptide chain and the aliphatic chain being linked by a peptide bond; the structure is as shown in the formula (1), linear, molecular weight For 2848 Da; SDTVnDATE
  • Another object of the present invention is to provide a lipopeptide derivative obtained by changing the length, hydrophilicity or hydrophobicity of a peptide chain or a lipid chain based on the formula (]-).
  • the lipopeptide derivative includes a peptide chain and a fatty chain, and the peptide chain and the aliphatic chain are connected by a hydrazone bond, and the structure thereof is any one of the formulas (2), (3), (4), (5), and (6).
  • the Staphylococcus epidermidis includes Staphylococcus epidermidis 1457 or Table Staphylococcus aureus 12228 or Staphylococcus epidermidis RP62A.
  • the lipopeptide can form an oil draining ring in the aqueous phase; after thin layer chromatography, a white band is formed by water coloring, and a purplish red band is formed by coloring with ninhydrin.
  • Another object of the present invention is to provide a method for preparing a lipopeptide, which ferments Staphylococcus epidermidis, collects an acid-precipitated fermentation bacterium of Streptococcus mutans, and extracts with a methanol to obtain a lipopeptide extract, which is then purified by HPLC. The lipopeptide is obtained.
  • the product was the object of the Ultra Performance Liquid Chromatography - four Yu time of flight mass spectrometer (Waters, ACQUITY TM UPLC & Q -'roF Premier, Shanghai Jiaotong supplied) on the two mass spectrometry, tandem mass spectrometry in accordance with The figure calculates the size of the ion dissociated by the parent ion, and then deduces the type of amino acid. This method is de-novo sequencing, and finally determines the sequence of the polypeptide.
  • a lipopeptide composed of a fatty acid to bind to a lysine site on a polypeptide sequence and a derivative thereof have anti-infective activity.
  • the structure of the lipopeptides and derivatives thereof of the present invention is determined by synthesizing lipopeptides and verifying their activity.
  • the protein content of the lipopeptide extract in PBS can be determined by the BCATM Protein Quality Kit for the concentration of the target product.
  • Another object of the present invention is to provide a process for the preparation of a lipopeptide derivative.
  • the synthesis of the polypeptide chain of the lipopeptide derivative is carried out by solid phase synthesis, and the fatty acid of the lipopeptide derivative is attached to N-methylmorpholine (NMM) via phthalate (BCP). On the polypeptide chain.
  • NMM N-methylmorpholine
  • BCP phthalate
  • the lipopeptide of the present invention can directly inhibit the growth of P. acnes.
  • the invention also provides the use of the lipid raft and its derivatives for the preparation of an anti-infective medicament.
  • the present invention also provides the use of the lipopeptide and its derivative in the preparation of a medicament for infecting Staphylococcus aureus.
  • the present invention also provides the use of the lipopeptide and its derivative as an additive in cosmetics, detergents, and moisturizers.
  • the lipopeptide and its derivative bind to the TLR2 receptor, activate the p38 MAPK signaling pathway, and induce keratinocytes to express defensins.
  • the lipopeptide and its derivatives inhibit the growth of S. aureus after stimulating human skin keratinocytes.
  • Lipopeptides and their derivatives induce a significant increase in the expression of antibacterial peptides in the skin, and enhance the ability to fight infection.
  • the lipopeptide of the present invention is obtained by extracting and purifying the skin symbiotic Staphylococcus fermentation broth. The mechanism by which lipopeptides induce defensin expression is activated to activate the TLR2-p38 MAPK signaling pathway to induce defensin expression.
  • the present invention investigates the biological activity of lipopeptides in animals and animals.
  • the lipopeptides of the present invention stimulated the isolated keratinocytes of C57BL/6 mice, and it was found that lipopeptides can significantly induce the expression of beta-defensin mBDs in mouse keratinocytes.
  • NHEK cells were stimulated with lipopeptide for 24 hours, cells were collected, disrupted by sonication, and cell lysate supernatant was collected. 10 ⁇ ⁇ of the cell lysate was incubated with 10 6 CFLI of Staphylococcus epidermidis 1457, Staphylococcus aureus, Propionibacterium acnes and Escherichia coli DH5a for 3 h (37 ° C), Then, the cells were diluted by a gradient, and the inhibitory effect of the cell lysate on the bacteria was examined on a solid plate.
  • lipopeptides can enhance the ability of keratinocytes to inhibit the growth of S. aureus in vitro, their effects continue to be verified in mice.
  • the specific method is: 8 weeks of mouse back hair removal, 24 hours later, intradermal injection of lipopeptide or PBS, lipopeptide dose of 2mg / kg, 22 hours later - a skin injection of lipopeptide, 2 ⁇ ⁇
  • S. aureus with OD 6 oo 0.7-0.8 was injected at the same position, and Staphylococcus aureus was mixed with an equal volume of P:BS containing 2% cyiodex beads before injection.
  • Staphylococcus aureus is the dose per ⁇ (1.75- 2xl0 7 CFU).
  • the infection of the back skin of the mice was observed daily and photographed. Three days later, the skin, liver, and spleen of the infected part of the control group and the lipopeptide injection group were homogenized, and the number of bacteria at the infected site was detected by gradient dilution. It can be seen that lipopeptide can significantly inhibit the infection of mouse skin sputum by S. aureus.
  • the bacterial content in the skin and liver of the lipopeptide injection group was significantly lower than that in the PBS injection group, and no significant difference was detected in the spleen.
  • lipopeptides and derivatives thereof of the invention for inducing expression of defensins.
  • mice were tested for lipopeptide inhibition of S. aureus infection, and it was found that the mice could no longer resist S. aureus infection after ⁇ 2 knockout.
  • NHEK cells were stimulated with PBS, lipopeptide, SB202190 (p38 MAPK inhibitor), lipopeptide plus SB202190, respectively; lipid rafts were found to induce phosphorylation of p38, whereas inhibitors were not able to induce phosphorylation of p38. This indicates that lipopeptides induce defensin expression by activating the p38 MAP signaling pathway.
  • the present invention provides a lipopeptide derivative which can induce defensin expression, prevent or reduce skin infection, and chemically synthesize the lipopeptide derivative.
  • Human primary keratinocyte ( ⁇ ) cells were then stimulated with different concentrations of lipopeptide derivatives, and it was found that lipopeptide derivatives can induce expression of human ⁇ -defensin 2 compared to the control group.
  • the lipopeptide derivative as described in Formula 6 induces the most prominent defensin.
  • the polypeptide sequence is very important for the expression of defensin induced by lipopeptide. After the peptide sequence is truncated, even if the length of the fatty acid chain is kept constant The activity of lipopeptide-induced defensin expression was significantly reduced. Description
  • Fig. 1 shows a thin layer chromatography analysis of lipopeptides isolated from Staphylococcus epidermidis in Examples 1 and 2 of the present invention.
  • Fig. 2 shows a high performance liquid chromatography analysis of a lipopeptide of Example 3 of the present invention.
  • Fig. 3 shows the first-order mass spectrometric analysis of the lipopeptide of Example 3 of the present invention.
  • Fig. 4 shows the first-order mass spectrometric analysis of the lipid raft of Example 3 of the present invention.
  • Fig. 5 shows the first-order mass spectrometric analysis of the lipopeptide of Example 3 of the present invention.
  • Fig. 6 shows the results of the second-stage mass spectrometry of the lipopeptide of Example 3 of the present invention.
  • FIG. 7 shows that the lipopeptide of the present invention inhibits the growth of acne propionate
  • Figure 8A shows that the lipopeptide of the present invention induces expression of keratinocyte defensins.
  • Figure 8B shows that the lipopeptide of the present invention induces expression of keratinocyte defensins.
  • Figure 9A shows that the lipopeptide of the present invention induces keratinocyte defensin to inhibit the growth of S. aureus.
  • Figure 9B shows that the lipopeptide of the present invention induces keratinocyte defensin to inhibit the growth of S. epidermidis.
  • Fig. 9C shows that the lipopeptide of the present invention induces keratinocyte defensin to inhibit the growth of P. acnes.
  • Figure 91 shows that the lipopeptide of the present invention induces keratinocyte defensin to inhibit the growth of E. coli.
  • Figure 10 shows that different concentrations of lipopeptides of the invention induce keratinocyte defensin to inhibit the growth of S. aureus.
  • Figure 11A shows the effect of the lipopeptide of the present invention on the toxicity and proliferation of sputum cells.
  • Figure 11B shows the effect of the lipopeptides of the present invention on the toxicity and proliferation of NHEK cells.
  • Figure 12A shows the infection of mice by the lipopeptides of the present invention against S. aureus.
  • Figure 12B shows that the lipopeptide of the present invention inhibits infection of S. aureus in mice.
  • Figure 12C shows the effect of the lipopeptide of the present invention on the body weight of mice after S. aureus infection.
  • Figure 12D shows that the lipopeptide of the present invention inhibits infection of mouse skin by S. aureus.
  • Figure 12E shows that the lipopeptide of the present invention inhibits infection of the liver of mice by S. aureus.
  • Figure 12F shows the effect of the lipopeptide of the present invention on the spleen of S. aureus on mice.
  • Figure 13 shows that the lipopeptide of the present invention activates TLR2 to induce expression of a defensin.
  • Figure 14A shows that the lipopeptide of the present invention activates TLR2 to induce expression of a defensin.
  • FIG. 14B shows that the lipopeptide of the present invention activates TLR2 to induce expression of an anti-regulator.
  • Figure 14C shows that the lipid raft-activated TLR2 of the present invention induces the expression of vasopressin.
  • Figure 14D shows that the lipopeptide of the present invention activates TLR2 to induce expression of a defensin.
  • Figure 14E shows that the lipopeptide of the present invention activates TLR2 to induce expression of a defensin.
  • Figure 14F shows that the lipopeptide of the present invention activates TLR2 to induce expression of a defensin.
  • Figure 15A shows that the lipopeptide of the present invention induces the expression of human ⁇ -ascorbicin 2 by activating the p38 MAPK signaling pathway.
  • Figure 15B shows that the lipopeptide of the present invention induces expression of human ⁇ -defensin 3 by activating the p38 MAPK signaling pathway.
  • Figure 16A shows that the lipopeptide of the present invention induces expression of mouse ⁇ defensin 4 by activating the p38 MAP signaling pathway.
  • Figure 16B shows that the lipid raft of the present invention induces the expression of ⁇ -defensin 4 in mice by activating the p38 MAPK signaling pathway.
  • Figure 17A shows that the lipopeptide derivative of the present invention induces expression of keratinocyte defensin.
  • Figure 17B shows that the lipopeptide derivative of the present invention induces expression of keratinocyte defensin.
  • Figure 17C shows that the lipopeptide derivative of the present invention induces expression of keratinocyte defensin.
  • Figure 17D shows that the lipopeptide derivative of the present invention induces expression of keratinocyte dysfunction.
  • Figure 17E shows that the lipid raft derivative of the present invention induces expression of keratinocyte defensin.
  • Fig. 18A shows the effect of the lipopeptide derivative of the present invention on the toxicity and proliferation of sputum cells.
  • Fig. 18B shows the effect of the lipopeptide derivative of the present invention on the toxicity and proliferation of sputum cells.
  • Fig. 18C shows the effect of the lipopeptide derivative of the present invention on the toxicity and proliferation of sputum cells.
  • Figure 18D shows the effect of the lipopeptide derivative of the present invention on the toxicity and proliferation of sputum cells.
  • Figure 18E shows the effect of the lipopeptide derivative of the present invention on the toxicity and proliferation of sputum cells.
  • Fig. 19A shows that the smear containing the lipopeptide derivative of the present invention induces expression of mouse defensin.
  • Fig. 19 shows that the smear containing the lipopeptide derivative of the present invention induces expression of mouse defensin.
  • Figure 20A shows an I1PLC map of PBS.
  • Figure 20B shows an HPLC chart of a lipopeptide.
  • Fig. 20C shows that the control mouse skin sputum does not contain a lipopeptide derivative.
  • Fig. 20 [) shows that the skin of the experimental group absorbed the lipopeptide derivative contained in the application liquid of the present invention.
  • Staphylococcus epidermidis fermentation 1 Remove the stored Staphylococcus epidermidis 1457 at 80 ° C., and streak it on tryptic soy broth (TSB) solid medium, 37 ! ⁇ , I6h, until a single colony grows.
  • TTB tryptic soy broth
  • each eluted peak was collected by using a separation high pressure liquid chromatograph Agilent 1200 and a C18 column, using a mobile phase gradient of water containing 0.1% TFA and acetonitrile of 0.1% TFA.
  • the target product was obtained.
  • the protein content of the lipopeptide extract in PBS was determined by the BCATM Protein Quality Kit.
  • the present invention may also select Staphylococcus epidermidis 12228, Staphylococcus epidermidis RP62A or other Staphylococcus epidermidis as the strain, and other experimental conditions and steps are the same as above.
  • Example 2 The lipid rafts isolated in Example 1 were taken 10 ⁇ : ⁇ on a thin-layer chromatography plate, and the spotting position was 1 cm from the lower edge. Place the plaque in a chromatography pre-saturated chromatography cylinder.
  • the layering agent stopped running at a distance of 1 cm from the edge of the plate. Put it in a ventilated kitchen. The plate was then placed in water for 5 mi and then air dried in a ventilated kitchen. Observe the position of the lipopeptide on the plate.
  • Example 1 The lipopeptide isolated in Example 1 was loaded onto a high pressure liquid chromatography analyzer (available from Shanghai Zhongke New Life Co., Ltd.). The gradient was eluted with a mobile phase gradient of 0.1% TFA in water and 0.1% hydrazine in acetonitrile. Then, the elution peaks were used separately. Peptide mass spectrometry analysis of molecular weight. After HPLC analysis, as shown in Fig. 2, three main peaks were obtained, and the peak times were 10 min, 69 min, and 70 min, respectively. After mass spectrometry analysis of the peptide, as shown in Fig. 3, the peak with a peak time of 10 min indicates that there are two substances with molecular weights of 1437 and 1621, respectively.
  • a peak with a peak time of 69 min indicates that a substance has a molecular weight of 2,491.
  • the molecular weight of the substance corresponding to the peak having a peak time of 70 min was 2848.
  • the substance having a molecular weight of 2848 was found to have anti-pathogenic infection activity by the in vitro cell assay as described in Example 7, i.e., the lipopeptide prepared in Example 1.
  • Other substances having a molecular weight of 1437, 1621 or 2491 have no activity against pathogenic bacteria.
  • Example 1 The lipopeptide structure obtained in Example 1 was determined by the above Examples 2, 3 and 4. In vitro cell experiments have shown that the formed lipopeptide has anti-infective activity only when the fatty acid in the lipopeptide binds to the lysine site on the polypeptide sequence. Whereas the fatty acid and polypeptide sequences are combined by other means, the anti-infective activity of the present invention is not obtained.
  • Example 5 Lipid rafts in the fight against pathogenic microorganisms]3 ⁇ 4
  • Example 6 Lipopeptide induces expression of human keratinocyte defensins.
  • Human keratinocyte ( ⁇ ) cells were stimulated with different concentrations of the lipid raft obtained in Example 1 for 24 hours, and then extracted finely. Total RNA from cells, reverse transcription into cDNA, real-time RTPCR detection of beta-defensin 2 (hBD2) and beta-defensin 3
  • Example 1 Lipopeptide induces keratinocyte defensin to inhibit the growth of Staphylococcus aureus
  • the lipopeptide itself can inhibit the growth of acne propioni, and the lipopeptide induces the production of defensins after the NHEK cells, and the defensins inhibit the growth of S. aureus.
  • Example 8 Different concentrations of lipopeptides induce keratinocyte defensins to inhibit the growth of Staphylococcus aureus
  • Example 2 After culturing the NHEK cells with different concentrations of the lipopeptide obtained in Example 1 for 24 hours, the cells were collected, disrupted by sonication, and the supernatant of the cell lysate was collected. 10 ⁇ ⁇ of the cell lysate was incubated with 10 6 CFU of S. aureus for 3 h (37 ⁇ ), then diluted in a gradient, and the inhibition of the cell lysate against Staphylococcus aureus was detected on a solid plate. As shown in Figure 10, the experimental results showed that after NHEK cells were stimulated with 2.5 g/mi 2i ⁇ g/mi lipopeptide, the lysate could significantly inhibit the growth of S. aureus, but when the concentration of lipopeptide was reduced to ig/ml. With ⁇ , ⁇ cell lysate can not inhibit the growth of Staphylococcus aureus.
  • Example 9 Effect of lipopeptides on toxicity and proliferation of NHEK cells.
  • the NHEK cells were stimulated with different concentrations of the lipopeptide obtained in Example 1 for 24 hours, and the cell supernatant was used to detect the toxicity of lipopeptide to NHEK using the LDH cytotoxicity test kit.
  • the effect of lipopeptides on the proliferation of sputum cells was examined by MTT assay.
  • Fig. 11A the experimental results show that high-concentration lipopeptides are toxic to NHEK, and the toxicity increases with the increase of lipopeptide concentration. Low-concentration lipopeptides are not toxic to cells.
  • Fig. 11A the experimental results show that high-concentration lipopeptides are toxic to NHEK, and the toxicity increases with the increase of lipopeptide concentration. Low-concentration lipopeptides are not toxic to cells.
  • Fig. 11A the experimental results show that high-concentration lipopeptides are toxic to NHEK, and the toxicity increases with the increase of lipopeptide concentration. Low-concentration lipopeptides
  • a high concentration (e.g., 15 g/ml or more) of lipid rafts inhibits proliferation of sputum cells, but a low concentration (e.g., 1.25 fig/m! or less) of lipopeptide does not inhibit proliferation of NHEK cells.
  • Example 10 Lipopeptides inhibit infection of S. aureus in mice.
  • the back hair of the mice was removed for 8 weeks, and after 24 hours, the lipopeptide or PBS (control group) obtained in the Example was injected intradermally.
  • the dose of lipopeptide was 2 mg/kg, and after 22 hours, the lipopeptide was injected once again, and after 2 hours, it was injected at the same position.
  • Staphylococcus aureus OD600-0.7-0.8 Staphylococcus aureus was mixed well with PBS containing 2% cytodex beads before injection. The dose of Staphylococcus aureus was ⁇ ( 1.75-2x10 7 CFU per day to observe the infection of the back skin of the mice and photographed. After three days, the skin and liver of the infected group of the control group and the lipopeptide group were taken. After tissue homogenization, gradient dilution was used to detect the number of bacteria in the infected area.
  • Fig. 12A experiments were carried out using two groups of mice, respectively. Compared with the control group of mice 1 and 3, the lesion area of the skin infection of mice 2 and 4 in the lipopeptide group was significantly small, and it was found that lipopeptide significantly inhibited the infection of S. aureus on mouse skin. As shown in Fig. 12B, experimental statistics showed that the lipopeptide significantly controlled the infection area and inhibited the infection of S. aureus on the skin of mice compared with the control group. As shown in Fig. 12C, the mice in the lipopeptide injection group had significantly higher body weight than the PBS group. As shown in Fig. 121] and Fig.
  • keratinocytes of ⁇ 2 + ' /+ mice and r2- mice were extracted, and 2411 was extracted with the lipopeptide obtained in Example 1, RNA was extracted, and the expression of mBD4 was detected by real-time RT-PCR.
  • the results of the experiment showed that the lipopeptide could induce the expression of keratinocyte m anti-peptide p: BD4 in ⁇ 7 ⁇ 2 +/+ mice, but no significant change was observed in keratinocytes of Tlrf mice.
  • Example 6 PBS (control group) or inverted lipopeptide was injected into 27r2 4 mice and nr2- A mice, respectively, followed by injection of OD 6 (XF : 0,6-0.8 Staphylococcus aureus ( 1.75-2xl0 7 CFU ) ;!, The ability of mice to resist Staphylococcus aureus infection after lipopeptide injection was detected. As shown in Figure 14A and Figure 14C, the results showed that lipopeptide-injected n + A mice can resist gold. Infection with Staphylococcus aureus.
  • the lipopeptide-injected 77r 2 knockout mouse Tir was not resistant to S. aureus infection.
  • Fig. 14E, Fig. 14F, and Fig. 14G there was no significant difference in the number of Staphylococcus aureus in the skin, liver, and spleen. It can be seen that lipid rafts are resistant to S. aureus infection by combining ⁇ 2.
  • Example 12 Lipopeptides induce expression of defensins by activating the ⁇ 38 ⁇ . signaling pathway.
  • the sputum cells were stimulated with PBS, the lipopeptide obtained in Example 1, SB202190 (p38 MAPK inhibitor), and the lipopeptide obtained by inverting SB202190, respectively.
  • the lipid raft obtained by adding the example 1 was remarkable.
  • the expression of human beta defensin-hBDs (liBD2, liBD3) was induced sexually, and the expression of hBDs could not be induced after the addition of inhibitors.
  • Mouse keratinocytes were isolated and stimulated with PBS, the lipopeptide obtained in Example 1, SB202190 (.p38 MAPK inhibitor), and the lipopeptide obtained in Example 1 plus SB202190.
  • Experimental Results As shown in Fig. 16A and Fig. 16B, the lipopeptide obtained in Example 1 can induce the expression of mouse keratinocyte defensin, and the addition of SB202190 inhibits the p38 MAPK signaling pathway. Thereafter, the lipopeptide obtained in Example 1 could not induce expression of mouse keratinocyte defensin. This suggests that lipopeptide-induced mouse keratinocytes produce defensins via the p38 MAP signaling pathway.
  • the length of the peptide chain or the aliphatic chain is changed, and the lipopeptide hydrophilicity or hydrophobicity of the two obtained is obtained to obtain a series of lipopeptide derivatives having different structures.
  • Entrusted Gil Biochemical (Shanghai) Co., Ltd. to synthesize lipopeptide derivatives of different structures, the structures of which are respectively (2), (3), (4), (5), (6), which are synthesized by solid phase synthesis.
  • the peptide chain which is synthesized by phthalyl phthalate and N-methylmorphine, is attached to the peptide chain to constitute a lipopeptide derivative.
  • RNA of the cells was extracted and reverse transcribed into cDNA. Reai-time RT PCR was used to detect ⁇ -defensin 2 (hBD2) and ⁇ defense. Expression of prime 3 (hBD3).
  • Fig. 17A is a result of inducing expression of avidin 2 (hBD2) by the lipopeptide derivative of the formula (2)
  • Fig. 17B is an expression of ⁇ -actin 2 (hBD2) induced by the lipopeptide derivative of the formula (3) Results
  • Fig. 17C shows the results of expression of ⁇ defensin 2 (hBD2) induced by the lipopeptide derivative of the formula (4)
  • Fig. 17A is a result of inducing expression of avidin 2 (hBD2) by the lipopeptide derivative of the formula (2)
  • Fig. 17B is an expression of ⁇ -actin 2 (hBD2) induced by the lipopeptide derivative of the formula (3) Results
  • Fig. 17C shows the results of expression of ⁇ defensin 2 (hBD2) induced by the lipopeptide derivative of the formula (4)
  • FIG. 17D shows that the lipopeptide derivative of the formula (5) induces ⁇ -defensin 2, respectively ( hBD2), ⁇ -defensin 3 (liBD3) expression results;
  • Figure 17E is the expression of ⁇ -defensin 2 (hBD2), ⁇ -defensin 3 ChBD3) induced by the lipopeptide derivative of formula (6), It can be seen that the effect of the lipid raft derivative induced by the formula (6) is the most obvious, and the 6,4 ⁇ ⁇ formula (6) lipopeptide derivative can up-regulate hBD2 expression by 280-fold, h: BD3 expression. Up-regulated by 25 times, the expression level increased significantly.
  • Example 14 Cytotoxicity of lipopeptide derivatives and their effect on keratinocyte proliferation.
  • NHE cells were stimulated with different concentrations of lipopeptide derivatives such as formula (2), formula (3), formula (4), formula (5), and formula (6) for 24 h, and then the cell supernatant was used for LDH cytotoxicity.
  • the test kit detects the toxicity of lipopeptides to NHEK. MTT was added to the cells to examine the effect of lipopeptide derivatives on the proliferation of NHEK cells. The result is shown in Figure 18.
  • Figure 18A is the result of the lipopeptide derivative of the formula (2)
  • Figure 18B is the result of the lipopeptide derivative of the formula (3)
  • Figure 18C is the result of the lipid raft derivative of the formula (4)
  • Figure 18D The result of the lipopeptide derivative of the formula (5); Fig.
  • Example 15 Use of lipopeptides and derivatives thereof in cosmetics and detergents.
  • the lipopeptide derivative (final concentration lffig/mi) of the formula (6) was mixed with DMSO (final concentration 25%) and 1 ⁇ oil (final concentration 25%) to form a coating liquid.
  • the back hair of the mice was removed for 8 weeks, and after 24 hours, the mixture was applied as a lipopeptide group.
  • some mouse tissues were extracted and the expression of ⁇ -defensin 4 and ⁇ -defensin 14 was detected by real time RT-PCR.
  • the lipopeptide group can significantly improve the skin of the mouse. Expression of ⁇ -defensin 14.
  • the large difference between the individual mice no significant difference was observed.
  • Fig. 20A shows the HPLC chart of the PBS alone (control group)
  • Fig. 20B shows the HPLC chart of the lipopeptide derivative group, and the position indicated by the arrow is the peak of the lipopeptide derivative.
  • the peak time is 26.37nnin.
  • a lipopeptide (final concentration: 1 mg/ml) represented by the formula (1) was mixed with DMSO (final concentration: 25%) and glycerin (final concentration: 25%) to form a coating liquid, and the same experimental method as above was used.
  • the experimental results are the same as above, indicating that the mice coated with the lipopeptide represented by the formula (1) can absorb the lipopeptide, and the expression of the skin ⁇ -defensin 4 and ⁇ -defensin 14 is significantly improved, and the pathogenic bacteria are produced. infection.

Abstract

本发明提供一种脂肽,其包括肽链和脂肪链,肽链和脂肪链通过肽键相连,其分子量为2848 Da,成线状,可以明显诱导防御素的表达,有效抑制金黄色葡萄球菌感染,从而预防或减少皮肤感染。本发明还公开了脂肽衍生物。本发明还公开所述脂舦及衍生物的制备方法及应用。

Description

技术领域
本发明涉及生物工程技术领域, 尤其是涉及一种提高宿主抗菌能力的脂舦及其衍生物、 及其制备方法和应用。 背景技术 自 20世纪三四十年代青霉素问世以来, 人钔又发现了头孢菌素类、氨基糖苷类、 大环内 酯类、 四环素类等诸多抗生素。 抗生素在治疗人类微生物感染中发挥了重要的作用。 但目前 微生物耐药菌株越来越多, 很多抗生素对微生物感染不再起到良好的治疗作用。 因此寻找抗 生素替代物成为人类越来越迫在眉睫的任务。
脂肽是由亲水的肽链和亲脂的脂肪酸链两部分组成,即由 10个左右的多肽和脂肪酸链形 成环形或线性的脂肽。脂肽类物质主要源于微生物的次级代谢产物, 其表现出多种生物活性。
1970年 Bemhekner和 Avigard就曾利用脂肽的抗虫特性将其作为杀虫剂使用 (翟颖,吕爽。一 种新型脂肽的抗菌活性研究.中国城乡企业卫生.2006,4(114): 19- 21 )。 目前, 脂肽类抗生素的研 究引起人们的广泛关注。 达托霉素 (商品名: Cubisin ) 是第一个用于临床的脂肽类抗菌素, 于 2003年获得美国 FDA批准上市, 用于治疗由革兰氏阳性菌引起的并发性皮肤感染和结构 性皮肤感染, 包括耐 '甲氧西林金黄色葡萄球菌 (MRSA)及对万古霉素抗性的粪肠球菌 (VRE) , 先后在美国、 德国、 英国和荷兰上市。 目前越来越多的脂肽类抗生素被发现, 已经成为国内 外生物医药研究的热点。
皮肤是人体对外界环境的第一道防线, 在皮肤表面生存着各种各样的细菌。 人们通常将 人体皮肤表面的细菌分为 4个种类, 它们分别为葡萄球菌、 链球菌、 丙酸菌和棒状衧菌四类。 金黄色葡萄球菌属于葡萄球菌属, 是一种有害菌, 通常导致人体感染。 金黄色葡萄球菌所引 起的疾病, 最常见的有三大类: ·是人体化脓性感染; 二是医院内感染, 通过污染的器械 用品造成伤口化脓感染, 注射部位化脓感染, 或支气管炎、 肺炎等症; ≡是食物中毒, 由肠 毒素引起。 表皮葡萄球菌虽然也属于葡萄球菌属, 但是它是一种皮肤共生菌, 有文献报道表 皮葡萄球菌的发酵液可以抑制金黄色葡萄球菌的感染 (Lai % Cogen AL, Radek KA, et a!. Activation of TLR2 by a small molecule produced by Staphylococcus epidermidis increases antimicrobial defense against bacterial skin infections, ,) Invest Dermatol, 2010, 130(9): •2 —I—I ~ 1. 发明内容
本发明公开了一种脂肽及其衍生物, 以及其制备方法和应用。 该脂肽是从表皮葡萄球菌 发酵液中提取获得, 可以大量诱导皮肤角质形成细胞中防御素的表达, 具有良好的抑制金黄 色葡萄球菌感染的效果。
本发明的发明目的之一是提供一种脂肽, 所述脂肽包括肽链和脂肪链, 肽链和脂肪链通 过肽键相连; 其结构如式 (1 ) 所示, 成线状, 分子量为 2848 Da;
Figure imgf000003_0001
SDTVnDATE
本发明的另一发明目的是提供一类脂肽衍生物, 该脂肽衍生物在式 (]—) 的基础上, 由改 变肽链或脂链的长度、 亲水性或疏水性所得, 所述脂肽衍生物包括肽链和脂肪链, 肽链和脂 肪链通过舦键相连, 其结构如式 (2)、 (3)、 (4)、 (5)、 (6) 所示之任何一种;
0=C-CH2-CH2-CH3
NH VKWI 式 (2);
0=C-CH2-CH2-CH2-CH2-CH3
N H
VKWI 式 (3);
0=C-CH2-CH2-CH3
NH
IGDLVKWII 式 (4);
Figure imgf000003_0002
NH VKWI 式 (5);
0=C-CH2-CH2-CH3
NH
IISTIGDLVKWIIDTVIIDATE 式 (6 其中, 所述脂肽是提取自表皮葡萄球菌; 所述表皮葡萄球菌包括表皮葡萄球菌 1457或表 皮葡萄球菌 12228或表皮葡萄球菌 RP62A。
其中, 所述脂肽在水相可以形成排油圈; 薄层层析之后, 用水显色形成白色条带, 用茚 三酮显色形成紫红色条带。
本发明的另一发明目的是提供一种脂肽的制备方法, 将表皮葡萄球菌发酵, 收集酸沉淀 的表皮蔔萄球菌发酵液, 经甲醇抽提, 得到脂肽提取物, 再经 HPLC纯化, 得到所述脂肽。
具体步骤如下:
( 1 ) 表皮葡萄球菌发酵
① 取出表皮葡萄球菌 1457或表皮葡萄球菌 12228或表皮葡萄球菌 RP62A,划线于胰鷗大豆 肉汤 (TSB ) 固体培养基上, 培养至长出单菌落。
② 挑取单菌落接种于 TSB液体培养基中培养。
③ 将过夜培养的表皮葡萄球菌菌液按转接于 TSB液体培养基中发酵。
(2) 发酵液酸沉淀
① 将表皮蔔萄球菌发酵液离心。
② 将离心后的表皮葡萄球菌发酵液上清液 ]¾盐酸调节 ρίί, 静置过夜。
( 3 ) 甲醇抽提
① 将酸沉淀的表皮葡萄球菌发酵液上清离心, 收集沉淀。
② 将沉淀置于甲醇中, 放在搅拌器上搅拌抽提。
③ 将抽提过夜的甲醇溶液离心, 收集上清。
④ 将甲醇抽提液在旋转蒸发仪上蒸千。 收集沉淀, 重新溶解于 PBS。
(4) HPLC纯化
将脂肽溶解后,利用分离型高压液相色谱仪 Agilent 1200和 C18柱,以含 TFA的水和 TFA 的乙腈为流动相梯度洗脱, 收集各个洗脱峰, 利用体外细胞实验检测各个洗脱峰诱导 beta-Ki 御素表达的能力; 将具有诱导 beta-防御素表达活性的洗脱峰利 )¾一级质谱鉴定洗脱峰中物质 的分子量, 从而得到目的产物。
鉴定多肽序列: 将目的产物在超高效液相色谱-四级衧飞行时间质谱联用仪 (Waters, ACQUITYTMUPLC&Q-'roF Premier, 上海交通大学提供)上进行二级质谱分析, 根据二级质 谱图 算母离子解离的离子的大小, 迸而推算出氨基酸的种类, 该种方法也就是 de-novo测 序, 最终确定多肽的序列。
鉴定脂肪酸链序列: 将脂肽充分千燥后, 加入甲醇和浓硫酸, 加热。 旋转蒸发所有溶剂 后,加入己垸抽提,最后经双蒸水洗涤。将己垸抽提液旋转蒸发。利用日本岛津 GCMS-QP2010 气质眹 仪(上海交通大学提供)和 ¾>.l(0.25mm*0.25um*30m) 色谱柱,分析所得到的物质。 根据气质联用分析结果, 鉴定该脂肽中的脂肪酸序列。
本发明中, 脂肪酸结合在多肽序列上的赖氨酸位点上所构成的脂肽及其衍生物才具有抗 感染活性。 通过合成脂肽并验证其活性, 从而确定本发明脂肽及其衍生物的结构。
就目的产物的浓度测定, 可通过 BCA™ Protein Quality Kit测定 PBS中脂肽提取物中的 蛋白含量。
本发明的另一发明目的是提供脂肽衍生物的制备方法。该脂肽衍生物的多肽链的合成是 通过固相合成方法合成的, 该脂肽衍生物的脂肪酸通过邻苯二甲酰丁辛酯 (BCP) 与 N-甲基 吗啉 (NMM ) 接在所述多肽链上。
本发明脂肽可以直接抑制痤疮丙酸杆菌的生长。
本发明还提供了所述脂趺及其衍生物在制备抗感染药物中的应用。
本发明还提供了所述脂肽及其衍生物在在制备抗金黄色蔔萄球菌感染药物中的应用。 本发明还提供了所述脂肽及其衍生物在化妆用品、 洗涤用品、 保湿 ]¾品中作为添加剂的 应用
本发明中, 所述脂肽及其衍生物与 TLR2受体结合, 激活 p38 MAPK信号通路, 诱导角 质形成细胞表达防御素。 所述脂肽及其衍生物在刺激人体皮肤角质形成细胞后, 细胞裂解液 可抑制抗金黄色葡萄球菌的生长。 脂肽及其衍生物诱导皮肤抗菌肽表达量的大大提高, 而 提高抗感染的能力。 本发明脂肽在皮肤共生菌葡萄球菌发酵液中提取纯化获得。 利用脂肽诱 导防御素表达的机制, 以激活 TLR2-p38 MAPK信号通路诱导防御素表达。
本发明对脂肽在动物体内、 外的生物学活性进行了研究。
用不同浓度的脂肽刺激人原代角质形成细胞(NHEK), 发现与对照组相比, 本发明脂肽 处理组的具有抑制革兰氏阳性细菌生长的抗菌肽 beta-防御素的表达量被大量诱导表达, 其中 hBD3 的表达上调 2000倍以上, liBD2 的表达也可以上调 100 倍以上, 具有极显著性差异 (ρ<0·001 )。
本发明脂肽刺激分离得到的 C57BL/6小鼠的角质形成细胞,发现脂肽可以显著性地诱 导小鼠角质形成细胞中 beta-防御素 mBDs的表达。
在证明脂肽可以诱导人角质形成细胞产生防御素后, 将 NHEK细胞用脂肽刺激 24小时 后, 收集细胞, 超声波破碎, 收集细胞裂解液上清。 将 10μ§的细胞裂解液与 106CFLI的表皮 葡萄球菌 1457、 金黄色葡萄球菌、 痤疮丙酸杆菌以及大肠杆菌 DH5a共同孵育 3h (37°C ), 然后梯度稀释, 取 ΙΟμΙ点在固体平板上检测细胞裂解液对细菌的抑制作用。 结果发现脂肽刺 激 ΝΗΕΚ细胞后, ΝΉΕΚ裂解液可以抑制金黄色葡萄球菌的生长, 但对表皮葡萄球菌、 痤疮 丙酸杆菌和大肠杯菌 DH5a的生长无影响。
在证明脂肽可以在体外增强角质形成细胞抑制金黄色葡萄球菌生长的能力之后, 继续在 小鼠上验证其作用。 具体方法是: 将 8周的小鼠背部毛发去除, 24小^后, 皮间注射脂肽 或 PBS , 脂肽剂量为 2mg/kg, 22小时后再-一次皮间注射脂肽, 2··3小时后, 在相同位置注射 OD6oo=0.7-0.8的金黄色葡萄球菌, 金黄色葡萄球菌注射前与含 2% cyiodex beads的 P:BS等体 积混合均匀。 金黄色葡萄球菌的剂量为每只 ΙΟΟμΙ ( 1.75- 2xl07CFU)。 每天观察小鼠背部皮肤 的感染情况并拍照。 三天后取对照组和脂肽注射组小鼠感染部位的皮肤、 肝脏、 脾脏, 组织 匀浆后, 梯度稀释检测感染部位细菌的数量。 可见脂肽可以明显捭制金黄色葡萄球菌对小鼠 皮趺的感染。 脂肽注射组小鼠皮肤和肝脏中细菌含量显著低于 PBS注射组, 脾脏中没有检测 出明显的差异。
本发明的脂肽及其衍生物在诱导防御素表达中的应用。
研究在野生型( +A)和? 2^小鼠上检测脂肽抑制金黄色葡萄球菌感染的情况, 发现 在 Τίτ2敲除后小鼠不能再抵抗金黄色葡萄球菌的感染。
用本发明脂駄分别注射?7r24/+小鼠和 r2- 小鼠的耳朵, 刺激 24h后, 剪 T耳朵, 提取 RNA,检测脂肽诱导 mBDs 表达的情况。发现本发明脂肽可以诱导 37r2+A小鼠 mBD4的表达, 但是在 ΤΙΓΓ'- 小鼠中没有诱导 mBD4的表达。
用 PBS、 脂肽、 SB2()2190(p38 MAPK inhibitor)、 脂肽加 SB202190分别刺激 ΝΉΕΚ细胞 发现, 加入脂肽可以显著性的诱导 hBDs的表达。而加入了抑制剂之后則不能诱导 hBDs的表 达。在小鼠角质形成细胞上我门重复出了相同的结果。将 2 ·2敲除后发现脂肽不能诱导 mBDs 的表达。
用 PBS、脂肽、 SB202190(p38 MAPK inhibitor)、脂肽加 SB202190分别刺激 NHEK细胞; 发现脂趺可以诱导 p38的磷酸化, 而加入了抑制剂则不能诱导 p38的磷酸化。 说明脂肽是通 过激活 p38 MAP 信号通路来诱导防御素的表达。
本发明提供的可以诱导防御素表达、 预防或减少皮肤感染的脂肽衍生物, 通过化学方式 合成该脂肽衍生物。 然后用不同浓度的脂肽衍生物刺激人原代角质形成细胞 (ΝΉΕΚ ) 细胞, 发现与对照组相比,脂肽衍生物都可以诱导人 β-防御素 2的表达。在合成的一系列衍生物中, 如式 6所述脂肽衍生物诱导防御素最明显。 与式 2、 3、 4、 5脂肽衍生物比较分析, 发现多肽 序列对脂肽诱导防御素表达非常重要, 将多肽序列截短之后, 即使保持脂肪酸链长短不变也 显著降低脂肽诱导防御素表达的活性。 跗图说明
图 1表示本发明实施例 1和 2中表皮葡萄球菌分离的脂肽薄层层析分析。
图 2表示本发明实施例 3脂肽高效液相色谱分析。
图 3表示本发明实施例 3脂肽的一级质谱分析。
图 4表示本发明实施例 3脂舦的一级质谱分析。
图 5表示本发明实施例 3脂肽的一级质谱分析。
图 6表示本发明实施例 3脂肽二级质谱结果。
图 7表示本发明脂肽抑制痤疮丙酸杼菌的生长
图 8A表示本发明脂肽诱导角质形成细胞防御素的表达。
图 8B表示本发明脂肽诱导角质形成细胞防御素的表达。
图 9A表示本发明脂肽诱导角质形成细胞防御素抑制金黄色葡萄球菌的生长。
图 9B表示本发明脂肽诱导角质形成细胞防御素不抑制表皮葡萄球菌的生长。
图 9C表示本发明脂肽诱导角质形成细胞防御素不抑制痤疮丙酸杆菌的生长。
图 91)表示本发明脂肽诱导角质形成细胞防御素不抑制大肠衧菌的生长。
图 10表示本发明不同浓度脂肽诱导角质形成细胞防御素抑制金黄色葡萄球菌的生长。 图 11A表示本发明脂肽对 ΝΉΕΚ细胞的毒性及增值的影响。
图 11B表示本发明脂肽对 NHEK细胞的毒性及增值的影响。
图 12A表示本发明脂肽裨制金黄色葡萄球菌对小鼠的感染。
图 12B表示本发明脂肽抑制金黄色葡萄球菌对小鼠的感染。
图 12C表示本发明脂肽在金黄色葡萄球菌感染后对小鼠体重的影响。
图 12D表示本发明脂肽抑制金黄色葡萄球菌对小鼠皮肤的感染。
图 12E表示本发明脂肽抑制金黄色葡萄球菌对小鼠肝脏的感染。
图 12F表示本发明脂肽对金黄色葡萄球菌对小鼠脾脏的影响。
图 13表示本发明脂肽激活 TLR2诱导防御素的表达。
图 14A表示本发明脂肽激活 TLR2诱导防御素的表达。
图 14B表示本发明脂肽激活 TLR2诱导防銜素的表达。
图 14C表示本发明脂趺激活 TLR2诱导防掏素的表达。
图 14D表示本发明脂肽激活 TLR2诱导防御素的表达。
图 14E表示本发明脂肽激活 TLR2诱导防御素的表达。 图 14F表示本发明脂肽激活 TLR2诱导防御素的表达。
图 15A表示本发明脂肽通过激活 p38 MAPK信号通路诱导人 β -防掏素 2的表达。
图 15B表示本发明脂肽通过激活 p38 MAPK信号通路诱导人 β -防御素 3的表达。
图 16A表示本发明脂肽通过激活 p38 MAP 信号通路诱导小鼠 β ··防御素 4的表达。 图 16B表示本发明脂趺通过激活 p38 MAPK信号通路诱导小鼠 β -防御素 4的表达。 图 17A表示本发明脂肽衍生物诱导角质形成细胞防御素的表达。
图 17B表示本发明脂肽衍生物诱导角质形成细胞防御素的表达。
图 17C表示本发明脂肽衍生物诱导角质形成细胞防御素的表达。
图 17D表示本发明脂肽衍生物诱导角质形成细胞防銜素的表达。
图 17E表示本发明脂舦衍生物诱导角质形成细胞防御素的表达。
图 18A表示本发明脂肽衍生物对 ΝΉΕΚ细胞的毒性及其增殖的影响。
图 18B表示本发明脂肽衍生物对 ΝΗΕΚ细胞的毒性及其增殖的影响。
图 18C表示本发明脂肽衍生物对 ΝΉΕΚ细胞的毒性及其增殖的影响。
图 18D表示本发明脂肽衍生物对 ΝΗΕΚ细胞的毒性及其增殖的影响。
图 18E表示本发明脂肽衍生物对 ΝΗΕΚ细胞的毒性及其增殖的影响。
图 19A表示本发明含有脂肽衍生物的涂抹液诱导小鼠防御素的表达。
19Β表示本发明含有脂肽衍生物的涂抹液诱导小鼠防御素的表达。
图 20A表示 PBS的 I1PLC图。
图 20B表示脂肽的 HPLC图。
图 20C表示对照组小鼠皮趺中不含有脂肽衍生物。
图 20[)表示实验组小鼠皮肤吸收本发明涂抹液中含有的脂肽衍生物。
具体实施方法 结合以下具体实施例和附图, 对本发明作进一步的详细说明, 本发明的保护内容不局限 于以下实施例。 在不背离发明构思的精神和范围下, 本领域技术人员能够想到的变化和优点 都被包括在本发明中, 并且以所 ^的权利要求书为保护范围。 实施本发明的过程、 条件、 试 剂、 实验方法等, 除以下专门提及的内容之外, 均为本领域的普遍知识和公知常识, 本发明 没有特别限制内容。
实施俩 1 : 脂肽的分离纯化。
Smyth.'iliomas et al. Isolation and Analysis of Lipopeptides and High olecular Weight Biosurfec【ants, 2010。 选用的菌种为表皮蔔萄球菌 1457。
( 1 ) 表皮葡萄球菌发酵 ① 于. ·80Ό取出保存的表皮葡萄球菌 1457,划线于胰酶大豆肉汤(TSB)固体培养基上, 37 !Ό , I6h, 至长出单菌落。
② 挑取单菌落接种于 20ml TSB液体培养基中培养, 37'C , 220q>m,16h。
③ 将过夜培养的表皮葡萄球菌菌液按 1%转接于 200mi TSB 液体培养基中发酵, 3TC , 220— rpm, 16h。
(2) 发酵液酸沉淀
① 将表皮葡萄球菌发酵液离心。 〗000(kpm, 4。C , 20min。
② 将离心后的表皮葡萄球菌发酵液上清液用 6M盐酸调节至 ρΗ^.Ο, 静置过夜。
(3) 甲醇袖提
① 将酸沉淀的表皮葡萄球菌发酵液上清离心。 OOOOrpm, 4。C , 20min o 收集沉淀。
② 将沉淀置于甲醇中, 放在搅拌器上搅拌抽提 16h, 温度为 37Ό。
③ 将抽提过夜的甲醇溶液离心。 lOOOOipm, 4°C , 20min。 收集上清。
④ 将甲醇抽提液在旋转蒸发仪上蒸干。 收集沉淀, 重新溶解于 PBS。
(4) HPLC纯化
将上述步骤获得的脂肽溶解后, 利用分离型高压液相色谱仪 Agilent 1200和 C18柱, 以含 0.1% TFA的水和 0.1% TFA的乙腈为流动相梯度洗脱, 收集各个洗脱峰, 得到目标产物。
(5 ) 浓度测定
通过 BCA™ Protein Quality Kit 测定 PBS中脂肽提取物中的蛋白含量。
在上述表皮葡萄球菌发酵步骤中, 本发明也可选用表皮葡萄球菌 12228、 表皮葡萄球菌 RP62A或其他表皮葡萄球菌作为菌种, 其他实验条件及步骤与上述相同。
实施例 2: 脂肽的鉴定。
将实施例 1分离的脂趺取 10μ:Ι点在薄层层析板上, 点样位置是距离下边缘 1cm处。 将层 析板放在 展层剂预饱和的层析缸内。 展层剂为正丁醇: 乙酸; 水 =4:2:1。 展层剂跑到距层 析板上边缘 lcm处后停止层析。放在通风厨内晾千。然后将板放在水里面 5mi 之后在通风 厨自然晾干。 观察板上的脂肽的位置。 完全晾干后在板上喷 0,25%的茚王酮, 置于 60Ό烘箱 内, lOmiti后观察板上的脂肽。 实验结果如图 1所示, 脂肽在水相形成排油圈, 经薄层层析 之后, 用水显色产生白色条带, ]¾茚三酮显色在相对应的位置产生紫红色条带。
实施例 3: 脂肽 HPLC分析及分子量鉴定, 多肽序列的鉴定
将实施例 1分离得到的脂肽上样到高压液相色谱分析仪 (上海中科新生命公司提供)上。以 含 0.1% TFA的水和 0.1 % ΪΡΆ的乙腈为流动相梯度洗脱, 80mi 然后, 将洗脱峰分别用多 肽质谱分析分子量。 经 HPLC分析, 如图 2所示, 得到三个主峰, 出峰时间分别是 lOmin, 69min, 70min。 经过多肽质谱分析, 如图 3所示, 出峰时间为 lOmin的峰表明有两种物质, 其分子量分别是 1437和 1621。 如图 4所示, 出峰时间为 69min的峰表明有一种物质分子量 为 2491。 如图 5所示, 出峰时间为 70min的峰对应的物质的分子量为 2848。
经如实施例 7所述的体外细胞实验检测, 分子量为 2848的物质具有抗病原菌感染活性, 即是实施例 1制备得到的脂肽。 分子量为 1437、 1621或 2491的其他物质均不具有抗病原菌 感染活性。
鉴定脂肽的多肽序列: 将出峰时间为 70min的洗脱峰在超高效液相色谱-四级杆飞行时间 质谱联用仪(Waters,ACQUITY' UPLC&Q-TOF Premiei;上海交通大学提供)上进行二级质谱 分析, 得到如图 6所示的二级质谱图, 利用 de novo 测序, 分析该脂肽的多肽序列为- DIISTIGDLVKWIIDTVIID ATE。
实施俩 4 鉴定脂肽中的脂肪酸链
1. 取 3mg实施例 1所得脂飲, 充分干燥。
2. 加入 0.95ml甲醇和 0.05ml浓硫酸。 90°C加热 151ι。
3. 旋转蒸发千溶剂后, 加入 1ml己垸抽提。
4. 加入 1ml双蒸水洗涤。 将己烷抽提液转移至新的溶剂瓶内, 旋转蒸发。
5. 气质眹 分析脂肪酸序列。
利 ]¾日本岛津 GCMS- QP2010气质联用仪(上海交通大学提供)和 hp- l(0.25mm*().25um*30m) 色谱柱, 分析上述步骤 4所得到的物质。 根据气质联 分析结果, 经鉴定该脂肽中的脂肪酸 序列为: CH3-(CH2)19-COOHo
通过以上实施例 2、 3和 4确定实施例 1所得到的脂肽结构。 经体外细胞实验表明, 只有 当该脂肽中的脂肪酸结合在多肽序列上的赖氨酸位点上的情况下, 所构成的脂肽才具有抗感 染活性。 而当脂肪酸与多肽序列通过其他方式结合所构成的物质并不具有本发明的抗感染活 性。 实施例 5: 脂舦在抗病原微生物感染中的应 ]¾
将 10μ8的实施例 1所得脂肽与 106CFU的痤疮丙酸杆菌, 37Ό共孵育 3h,然后梯度稀释, 取 ΙΟμΙ点在固体培养基平板上, 与不含脂肽的对照组 (PBS) 相比, 发现该脂肽可以抑制痤 疮丙酸杼菌的生长, 实验结果如图 7所示, 其中, **表示 ρ<0,01 , *表示 ρ<0,(〕5。
实施例 6 脂肽诱导人角质形成细胞防御素的表达。
用不同浓度的实施例 1所得脂趺刺激人角质形成细胞 (ΝΗΕΚ)细胞 24小时, 然后提取细 胞的总 RNA, 反转录成 cDNA后, real-time RTPCR检测 β --防御素 2 (hBD2)和 β -防御素 3
(WBD3) 的表达。 实验结果表明, 如图 8Α、 图 8Β所示, 脂肽诱导 ΝΗΕΚ表达大量 hBD2 和 hBD3, 与对照组 (PBS组., 未加入脂肽, 表达量设为 1 ) 相比, 脂肽处理组 hBD3的表达 量上调 2000倍以上, hBD2的表达量上调 100倍以上。
实施例 1 脂肽诱导角质形成细胞防御素抑制金黄色葡萄球菌的生长
将 NHEK细胞用实施例 1所得脂肽刺激 24小时后, 收集细胞, 超声波破碎, 收集细胞裂 解液上清。 将 10μ§的细胞裂解液与 106CFU的表皮葡萄球菌 】457、 金黄色葡萄球菌、 大肠 杆菌 DH5a、 痤疮丙酸杆菌共同孵育 3h ( 37°C ), 然后梯度稀释, 取 ΙΟμΙ点在固体平板上检 测细胞裂解液对细菌的抑制作用。 实验结果表明, 如图 9Α所示, 与对照组 (PBS组) 相比, ΝΗΕΚ细胞受脂肽刺激之后, 其裂解液可以明显捭制金黄色葡萄球菌的生长。 如图 9Β , 图 9C、 图 9D所示, 与对照组 (PBS组) 相比, NHEK细胞受脂肽刺激之后, 其裂解液对表皮 葡萄球菌 1457、 痤疮丙酸杆菌、 大肠杆菌 DH5a的生长无影响。
结合实施例 5可见, 脂肽本身可以抑制痤疮丙酸杯菌的生长, 脂肽诱导 NHEK细胞后产 生防御素, 防御素抑制金黄色葡萄球菌的生长。
实施例 8: 不同浓度脂肽诱导角质形成细胞防御素抑制金黄色葡萄球菌的生长
分别用不同浓度的实施例 1所得脂肽刺激 NHEK细胞 24小时后, 收集细胞, 经超声波破 碎, 收集细胞裂解液上清。 将 10μ§的细胞裂解液与 106CFU的金黄色葡萄球菌共同孵育 3h ( 37Ό ), 然后梯度稀释, 取 ΙΟμΙ点在固体平板上检测细胞裂解液对金黄色蔔萄球菌的抑制 作 。 如图 10所示, 实验结果表明, 用 2.5 g/mi 2i^g/mi脂肽刺激 NHEK细胞后, 其裂解液 可以明显抑制金黄色葡萄球菌的生长, 但当脂肽浓度降低到 ig/ml以 ^, ΝΉΕΚ细胞裂解 液则不能抑制金黄色葡萄球菌的生长。
实施例 9 脂肽对 NHEK细胞的毒性及增殖的影响。
分别用不同浓度的实施例 1所得脂肽刺激 NHEK细胞 24h后,取细胞上清用 LDH细胞毒 性检测试剂盒检测脂肽对 NHEK的毒性。 利用 MTT法检测脂肽对 ΝΉΕΚ细胞增殖的影响。 如图 11A所示, 实验结果表明, 高浓度脂肽对 NHEK会产生毒性, 毒性随着脂肽浓度的升高 逐渐升高, 低浓度脂肽对细胞没有毒性。 如图 11B所示, 高浓度 (例如 15 g/ml或以上) 的 脂趺抑制 ΝΉΕΚ细胞的增殖, 但低浓度(例如 1.25fig/m!或以下) 的脂肽不抑制 NHEK细胞 的增殖。
实施例 10: 脂肽抑制金黄色葡萄球菌对小鼠的感染。
将 8周的小鼠背部毛发脱去, 24小^后, 皮间注射实施例〗所得脂肽或 PBS (对照组), 脂肽剂量为 2mg/kg, 22小^†后再一次皮间注射脂肽, 2·3小时后, 在相同位置注射
OD600-0.7-0.8的金黄色葡萄球菌。金黄色葡萄球菌注射前与含 2% cytodex beads的 PBS混合 均匀。 金黄色葡萄球菌的剂量为每只 ΙΟΟμΙ ( 1.75-2xl07CFU 每天观察小鼠背部皮肤的感染 情况并拍照。 三天后取对照组和脂肽组小鼠感染部位的皮趺、 肝脏、 膊脏, 组织匀浆后, 梯 度稀释检测感染部位细菌的数量。
如图 12A所示, 分别用两组小鼠进行实验。 与对照组的小鼠 1、 小鼠 3相比较, 脂肽组的 小鼠 2、 小鼠 4的皮肤感染的病灶面积明显小, 可见脂肽明显抑制金黄色葡萄球菌对小鼠皮 肤的感染。 如图 12B所示, 实验统计结果表明, 与对照组相比较, 脂肽明显有效地控制感染 面积并抑制金黄色葡萄球菌对小鼠皮肤的感染。 如图 12C所示, 脂肽注射组的小鼠体重显著 高于 PBS组。 如图 121〕、 图 12E所示, 脂肽注射组的小鼠皮肤、 肝脏细菌含量显著低于 PBS 注射组。 如图 12F所示, 脾脏中未检测出脂肽组与对照组之间的明显差异。
实施俩 11 : 脂肽激活 TLR2诱导防御素的表达
分别提取了 Π^2+'/+小鼠和 r2- 小鼠的角质形成细胞, 用实施例 1所得脂肽刺激 2411, 提取 RNA, real-time RT-PCR检测 mBD4的表达。 如图 13所示, 实验结果表明, 脂肽可以 诱导 Ϊ7Γ2+/+小鼠角质形成细胞抗菌肽 m:BD4的表达, 但是在 Tlrf 小鼠的角质形成细胞没有 看到明显变化。
如实施例 6, 在 27r24 小鼠和 nr2-A 小鼠上分别注射 PBS (对照组)或实施倒 1所得脂 肽, 然后注射 OD6(XF:0,6-0.8的金黄色葡萄球菌 (1.75-2xl07CFU ) ;!, 检測脂肽注射后小鼠抵 抗金黄色葡萄球菌感染的能力。 如图 14A、 图 14C所示, 实验结果表明, 脂肽注射的 n +A 小鼠可以抵抗金黄色葡萄球菌的感染。
但是, 如图 14B、 图 14C所示, 脂肽注射的 77r 2敲除小鼠 Tir ) 却不能抵抗金黄色 葡萄球菌的感染。 如图 14E、 图 14F、 图 14G所示, 皮趺、 肝脏、 脾脏中的金黄色蔔萄球菌 的数目没有显著性差异。 可见脂舦是通过结合 ΠΓ 2来抵抗金黄色葡萄球菌的感染。
实施例 12: 脂肽通过激活 Ρ38 ΜΑΡΚ.信号通路诱导防御素的表达。
用 PBS、 实施例 1所得脂肽、 SB202190(p38 MAPK抑制剂)、 实施倒 1所得脂肽加 SB202190分别刺激 ΝΉΕΚ细胞, 如图】 5A、 图 15B所示, 加入实施例 1所得脂舦可以显著 性地诱导人 β防御素 - hBDs (liBD2 , liBD3) 的表达, 而加入了抑制剂之后則不能诱导 hBDs 的表达。
分离小鼠的角质形成细胞, 用 PBS、 实施例 1所得脂肽、 SB202190(.p38 MAPK抑制剂)、 实施例 1所得脂肽加 SB202190分别刺激。 实验结果如图 16 A、 图 16B所示, 实施例 1所得 脂肽可以诱导小鼠角质形成细胞防御素的表达, 加入 SB202190将 p38 MAPK信号通路抑制 之后, 实施例 1所得脂肽不能诱导小鼠角质形成细胞防御素的表达。 说明脂肽诱导小鼠角质 形成细胞产生防御素也是通过 p38 MAP 信号通路。
实施例 13: 脂肽衍生物诱导防御素的表达
在式(1 ) 的基础上, 改变肽链或脂链的长度、 实施俩 1所得脂肽亲水性或疏水性获得一 系列不同结构的脂肽衍生物。 委托吉尔生化 (上海) 有限公司合成不同结构的脂肽衍生物, 其结构分别为式 (2)、 ( 3)、 (4)、 (5)、 (6), 通过固相合成方法合成其中的肽链, 通过邻苯 二甲酰丁辛酯和 N-甲基吗琳合成其中的脂肪酸并接在该肽链上构成脂肽衍生物。用不同浓度 的脂肽衍生物刺激人角质形成细胞 细胞 24小时, 然后提取细胞的总 RNA, 反转录成 cDNA后, reai-time RT PCR检测 β -防御素 2 (hBD2) 和 β ··防御素 3 (hBD3) 的表达。
实验结果表明, 如图 17所示, 脂肽衍生物都可以诱导 ί¾ΐ銜素 2的表达。 图 17A为式(2) 所述脂肽衍生物诱导 防銜素 2 (hBD2) 的表达结果; 图 17B为式 (3 ) 所述脂肽衍生物诱 导 β ·防銜素 2 (hBD2)的表达结果;图 17C为式(4)所述脂肽衍生物诱导 β ··防御素 2 (hBD2) 的表达结果; 图 17D为式 (5) 所述脂肽衍生物分别诱导 β -防御素 2 (hBD2)、 β -防御素 3 (liBD3) 的表达结果; 图 17E为式 (6) 所述脂肽衍生物分别诱导 β -防御素 2 (hBD2)、 β - 防御素 3 ChBD3) 的表达结果, 认结果可以看出式(6)所述脂趺衍生物诱导防御素的效果最 为明显, 其中 6,4 μ Μ的式 (6) 脂肽衍生物可以使 hBD2表达上调 280倍, h:BD3表达上调 25倍, 表达量显著提高。
实施例 14: 脂肽衍生物的细胞毒性以及其对角质形成细胞增殖的影响。
分别用不同浓度的如式 (2)、 式 (3)、 式 (4)、 式 (5)、 式 (6) 所述脂肽衍生物刺激 NHE 细胞 24h后, 取细胞上清用 LDH细胞毒性检测试剂盒检测脂肽对 NHEK的毒性。 在 细胞中加入 MTT, 检测脂肽衍生物对 NHEK细胞增殖的影响。结果如图 18所示。 图 18A为 式 (2) 所述脂肽衍生物的结果; 图 18B为式 (3) 所述脂肽衍生物的结果; 图 18C为式 (4) 所述脂趺衍生物的结果; 图 18D为式 (5 ) 所述脂肽衍生物的结果; 图】 8E为式 (6) 所述脂 肽衍生物的结果。 实验结果表明, 脂肽衍生物对 NHEK会产生轻微的毒性, 毒性随着脂肽浓 度的升高逐渐升高。 高浓度的脂肽衍生物对 NHEK细胞的增殖也有轻微的抑制作用。 但是这 些毒性都在可接受的范围内。
实施例 15: 脂肽及其衍生物在化妆品、 洗涤用品中的应用。
将式(6)所述脂肽衍生物(终浓度 lffig/mi)与 DMSO (终浓度 25% )、 1†油 (终浓度 25%) 混合均匀形成涂液。 将 8周的小鼠背部毛发脱去, 24h后, 涂抹混合液, 作为脂肽组。 48h后 取一部分小鼠组织抽提 RNA, 利 )¾ realtime RT-PCR检测小鼠 β -防御素 4和 β -防御素 14的 表达。 如图 19A, 图 19B所示, 与对照组相比较, 脂肽组可明显提高小鼠皮肤 β ··防銜素 4和 β—防御素 14的表达。 但是由于小鼠个体之间差异太大, 未表现显著性差异。
检验小鼠皮肤吸收脂肽的情况。 将经涂液涂抹的小鼠皮肤剪下, 组织勾浆后, 离心, 取 上清, 在 Aigiem 1200高效液相色谱仪上检测皮肤对脂肽衍生物的吸收。 结果如图 20所示: 图 20A所示为单独 PBS (对照组) 的 HPLC图, 图 20B所示为脂肽衍生物组的 HPLC图, 箭 头所示位置为脂肽衍生物的出峰, 出峰时间为 26.37nnin。 在小鼠皮肤表面涂抹脂肽衍生物 48h之后,取皮肤匀浆后,离心取上清上样到 HPLC上,可以看到在 26.30min出现一与图 20B 相同的脂舦峰图, 如图 20D所示。 由于色谱柱温度、 环境温度或机器本身的影响, 同一种物 质两次实验的保留时间可能会出现一定的漂移, 图 20B与图 20D中脂肽衍生物保留时间相差 0.07min, 可以认定为同一物质。 如图 20C所示, 对照组在 26,37mii 左右没有出现与图 20B 相似的峰。 可见小鼠皮肤可以吸收脂肽衍生物, 进而诱导防御素的表达, 抑制病原菌的感染。
将如式 (1 )所示的脂肽 (终浓度 lmg/ml) 与 DMSO (终浓度 25% )、 甘油 (终浓度 25%) 混合均匀形成涂液, 采用与上述相同的实验方法, 得到的实验结果同上, 表明涂抹如式 (1 ) 所示的脂肽的小鼠, 其皮肤可以吸收该脂肽, ϋ皮肤 β -防御素 4和 β -防御素 14的表达明显 提高, 捭制病原菌的感染。

Claims

权 利 要 求 书
1。 一种脂肽, 其特征在于, 所述脂肽包括肽链和脂肪链, 肽链和脂肪链通过肽键相连; 其
Figure imgf000015_0001
2. —类脂肽衍生物, 其特征在于, 所述脂肽衍生物包括肽链和脂肪链, 肽链和脂肪链通过 肽键相连; 其结构如式 (2)、 (3)、 (4)、 (5)、 (6) 所示之任何一种;
0=C-CH2-CH2-CH3
NH
VKWI ζ (2);
0=C-CH2-CH2-CH2-CH2-CH3
I
N H
VKWI
式 (3);
0=C-CH2-CH2-CH3
NH
IGDLVKWII 式 (4);
Figure imgf000015_0002
NH VKWI 式 (5 );
0=C-CH2-CH2-CH3
NH
IISTIGDLVKWIIDTVIIDATE 式 (6)'
3. 如权利要求 1 所述的脂肽, 其特征在于, 所述脂肽提取自表皮葡萄球菌; 所述表皮葡萄 球菌包括皮肤共生菌表皮葡萄球菌 1457或表皮葡萄球菌 12228或表皮葡萄球菌 RP62A。
4. 如权利要求 1所述脂肽的制备方法, 其特征在于, 将表皮葡萄球菌发酵, 收集酸沉淀的表 皮葡萄球菌发酵液的上清液, 经甲醇抽提, 得到脂肽提取物, 再经 HPLC纯化, 得到所述 脂肽。
5. 如权利要求 4所述的制备方法, 其特征在于, 包括步骤:
( 1 ) 表皮葡萄球菌发酵
于- 80 °C冰箱取出保存的表皮葡萄球菌 1457或 12228或 RP62A活化后,转接于 200ml TSB 液体培养基中发酵, 37 °C , 220rpm, 16h;
(2) 发酵液酸沉淀
将表皮葡萄球菌发酵液离心; 将发酵液的上清液) ¾ 6M盐酸调节至 ρΗ=2.0, 4Ό静置过 夜;
(3) 甲醇抽提
将酸沉淀的表皮葡萄球菌发酵液上清离心; 将沉淀置于甲醇中袖提; 将抽提过夜的甲醇 溶液离心, 收集上清; 将甲醇抽提液在旋转蒸发仪上蒸干, 最后 ]¾油泵抽提, 最终得到脂趺 提取物;
(4) HPLC纯化
将脂肽提取物溶解后,利用分离型高压液相色谱仪 Agi】entl200和 C18柱,以含 0.1% TFA 的水和 0.1% TFA的乙腈为流动相梯度洗脱,收集各个洗脱峰,通过一级质谱鉴定各个洗脱峰 物质的分子量, 从而得到目的产物。
6. 如权利要求 2所述脂肽衍生物的制备方法, 其特征在于, 所述脂肪酸通过邻苯二甲酰丁 辛酯和 Ν··甲基吗啉接在所述肽链上, 所述肽链是通过固相合成方法合成。
7. 如权利要求 1所述的脂肽, 其特征在于, 可以直接抑制痤疮丙酸杆菌的生长。
8. 如权利要求 1所述的脂肽或如权利要求 2所述的脂肽衍生物在制备抗感染药物中的应用。
9. 如权利要求 1所述的脂肽或如权利要求 2所述的脂肽衍生物在制备抗金黄色葡萄球菌感染 的应用。
10.如权利要求 1所述的脂肽或如权利要求 2所述的脂肽衍生物在化妆用品、洗涤 )¾品、保湿 用品中作为添加剂的应用。
11.如权利要求 8、 9或 10所述的应用,其特征在于,所述脂肽及其衍生物与 TLR2受体结合, 激活 p38 MAP 信号通路, 诱导角质形成细胞表达防御素。
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