CN102871996B - Antibiotic composition and application thereof - Google Patents
Antibiotic composition and application thereof Download PDFInfo
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- CN102871996B CN102871996B CN201210333694.1A CN201210333694A CN102871996B CN 102871996 B CN102871996 B CN 102871996B CN 201210333694 A CN201210333694 A CN 201210333694A CN 102871996 B CN102871996 B CN 102871996B
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- ser
- meropenem
- aminoacid
- methionine
- antibiotic
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
Landscapes
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
Abstract
The invention provides a novel antibiotic composition and an application thereof. The antibiotic composition consists of two components: D-amino acid and an antibiotic activity drug and/or derivative of the antibiotic activity drug. The D-amino acid is composited with the available antibiotics for the first time, and used to interfere with physiologic metabolism of bacteria to improve the antibiotic activity of the antibiotics, thereby providing a brand-new approach to dealing with the problem of increasingly severe bacterial drug resistance. Compared with the traditional new drug research and development, the antibiotic composition and a method of combined administration have the advantages of high efficiency, quickness, low cost, multiple optional compositions and the like, and show the favorable antibiotic activity in in-vitro and in-vivo anti-infection researches.
Description
Technical field
The invention belongs to pharmaceutical field, specifically, relate to a kind of antibacterial combination and application thereof.
Background technology
Infectious disease is the common frdquently encountered disease threatening human life's health, is also one of the important complication and the cause of the death of Multiple organs disorders.The application of anti-infectives greatly reduces the death of infectious disease.Conventional anti-infectives comprises beta-lactam antibiotic, quinolone antibiotic, aminoglycoside antibiotics etc.Its mechanism of action comprises anti-bacteria Cell wall synthesis, some function of T suppression cell film, and Profilin matter is synthesized, and suppresses nucleic acid synthesis, suppresses folic acid synthesis etc.
D-aminoacid is natural to be present in many biologies, and play specific function, if D-alanine and D-Glu are the important component of bacteria cell wall, and D-Ser is the neurotransmitter etc. of the mankind.But under usual condition, these relatively rare aminoacid are very low at bacterium bulk concentration.And recent report finds that the various D-aminoacid that antibacterial produces when steady state period can accumulate mM level that reaches, prompting D-aminoacid is relevant to the physiological status of antibacterial.
Biofilm is by bacterial adhesion in contact surface, and secretion polysaccharide matrix, fibrin, lipid protein etc., by himself embedding wherein a large amount of bacterial accumulation film sample things formed.Various bacteria can form biofilm (as Pseudomonas aeruginosa, staphylococcus aureus, staphylococcus epidermidis, escherichia coli etc.).It is cause some chronic infection recurrent exerbation to be difficult to the major reason of curing and bacterial drug resistance produces that bacterial biofilm is formed, and its mechanism mainly comprises: reduce antibiotic permeability; Absorption antibiotic inactivator, deactivation antibiotic; Bacterial metabolism slows down, and in " sub-hibernation-like state ", reduces (antibacterial of antibacterial to the sensitivity specific ionization state of medicine forming biofilm is low more than 1000 times) antibiotic sensitivity; Escape the scavenging action etc. of body immune system.And study discovery recently, the D-ispol of nanomolar range can make the bacterial strains such as the bacillus subtilis of formation biofilm return free state, thus recover the sensitivity of strains, and the amino acid whose fact of D-can be produced based on many bacterial strains, infer that D-aminoacid may be the universal signal that biofilm dissociates.
There is drawback due on the pesticide application strategy that traditional anti-infectives is treated, add that substance abuse problems is serious, thus microecological balance is created have a strong impact on.Under antibiotic selective pressure, occur as MRSA(methicillin-resistant staphylococcus aureus), VRE(vancomycin-resistant enterococcus), PRSP(penicillin resistance pneumococcus) etc. Gram-positive fastbacteria and multidrug resistance gram negative bacteria as Acinetobacter bauamnnii, klebsiella pneumoniae, escherichia coli, bacillus pyocyaneus etc., and fastbacteria treatment is very thorny, infectious age is made sharply to increase, serious threat (Clin Microbiol Rev is constituted to the health of the whole mankind, 22 (4): 582-610,2009).
The situation is tense for China's bacterial resistance, and multidrug resistance G-bacterium infection problems is serious, and be widely current clinically to the Pseudomonas aeruginosa of carbapenem antibiotic drug resistance, Acinetobacter bauamnnii, treatment difficulty, even pasts medical help.Become the primary cause of death of infectious disease at U.S. MRSA, superbacteria NDM-1 breaks out with popular in the whole world, more causes showing great attention to of the whole world.And bacterial resistance gene is also often positioned on displaceable element, thus accelerate the propagation of drug resistant gene between different strains.Therefore in the urgent need to strengthening the research and development to drug-resistance bacteria medicine.
Many drug resistant genes derive from the non-pathogenic bacteria in environment, and the powerful drug resistance system that non-pathogenic bacteria carries comprises natural, semi-synthetic and complete synthesis antibiotic drug resistance element, and the generation of drug resistance is seemingly inevitable.Seldom have the antibiotic of newtype to come out in recent decades, and the exploitation being novel drug-resistance bacteria medicine by the antibacterial adjuvant of antibiotic and other biological bioactive molecule and existing Antibiotic combination medication provide new approaches.
Summary of the invention
The object of this invention is to provide the application of D-aminoacid in the antibacterial activity strengthening antibacterials.
Another object of the present invention is to provide a kind of novel antibacterial pharmaceutical composition and application thereof.
Another object of the present invention is to provide D-aminoacid and the application of antibacterials drug combination in infectious disease treatment.
In order to realize the object of the invention, a kind of antibacterial combination of the present invention, is made up of two kinds of components, and one is D-aminoacid, and another kind is antimicrobial active medicament and/or its derivant; Wherein, described D-aminoacid be D-alanine, D-Ser, D-methionine, D-Thr, D-phenylalanine, D-Glu, D-Gln, D-PROLINE, D-Arg, D-Lys, D-Cys, D-Val, D-Leu, D-Ile, D-trp, D-Tyrosine, D-Asp, D-His, D-Asn and do not possess in the glycine of D L typing one or more; Described antimicrobial active medicament and/or its derivant are one or more in beta-lactam antibiotic, aminoglycoside antibiotics, quinolone antibiotic, macrolide antibiotics, chloromycetin series antibiotics, glycopeptide antibiotics or fosfomycin etc.
In aforesaid antibacterial combination, the amino acid whose concentration range of D-is 0.001mM ~ 10M.The selection of the amino acid whose kind of D-and concentration in compositions, according to the bacterial strain of work done in the manner of a certain author, antibiotic kind and different, preferably resists specific bacterial strain to affect one or more D-aminoacid drug combinations of obvious (MIC value is lower) on this antibiotic.Final purpose obtains a series of D-aminoacid antibacterial combination that effectively can resist specific strain infection respectively.
The preparation method of aforementioned antibacterial combination comprises two kinds, the first is: first two kinds of component D-aminoacid, antimicrobial active medicament and/or its derivant are mixed with mother solution with water or suitable solvent (selecting according to D-aminoacid, antimicrobial active medicament) respectively, then and required D-amino acid concentration active according to antibacterials is mixed with both drug combination liquid.The second is: be mixed in proportion D-aminoacid, antimicrobial active medicament and/or its derivant, then adds water or suitable solvent (selecting according to D-aminoacid, antimicrobial active medicament) and is directly mixed with both drug combination liquid.Such as, for dissolve D-Leu, imipenum, erythromycin, chloromycetin solvent be respectively 1M hydrochloric acid solution, 0.01M phosphate buffer (pH7.2), 95% ethanol or glacial acetic acid, 95% ethanol.
The present invention also provides described antibacterial combination preparing the application in anti-infectives.
The antimicrobial spectrum of this anti-infectives is Gram-positive and/or gram negative bacteria and their fastbacteria.Preferably, described gram-positive bacterium is: one or more in staphylococcus aureus, staphylococcus epidermidis, enterococcus faecalis, enterococcus faecalis, streptococcus pneumoniae, streptococcus pyogenes etc.
Described gram negative bacteria is: one or more in Acinetobacter bauamnnii, klebsiella pneumoniae, escherichia coli, bacillus pyocyaneus, serratia marcescens, proteus mirabilis, proteus vulgaris, Mo Genmo Salmonella, special-shaped citrobacter, enterobacter cloacae, clostridium perfringen, thunder Ji Shi Pu Lufeideng bacillus etc.The present invention further provides D-aminoacid and the application of antibacterials drug combination in infectious disease treatment, comprising: 1) D-aminoacid and antibacterials make compound formulation drug combination; Or 2) D-aminoacid and antibacterials medication successively, namely first give D-aminoacid, after give antibacterials; Or first give antibacterials, after give D-aminoacid.
D-aminoacid and existing antibacterials are carried out science, reasonably combine by the present invention first, be used for strengthening the antibacterial activity of antibacterials by D-aminoacid interference Bacterial Physiological metabolism, for the day by day serious bacterial resistance sex chromosome mosaicism of reply provides a brand-new approach.The advantages such as the method for antibacterial combination provided by the invention and drug combination has efficiently for traditional new drug development, quick, low cost, alternate combinations are many, and demonstrate good antibacterial activity in infection research in vivo and in vitro.
Detailed description of the invention
Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.If do not specialize, the conventional means that technological means used in embodiment is well known to those skilled in the art, is raw materials usedly commercial goods.
The preparation of embodiment 1 D-Ser and meropenem drug combination liquid
1. take D-Ser powder (molecular weight 105.09, purity 98%) 0.429g, be settled to 10ml with sterilized water, aseptic filtration, obtain 0.4M mother solution.
2. get 0.4M D-Ser mother solution 0.25ml, be settled to 10ml with sterilized water, obtain 10mMD-serine mother solution.
3. get 10mM D-Ser mother solution 0.1ml, be settled to 10ml with sterilized water, obtain 0.1mM D-Ser mother solution.
4. take meropenem powder (purity 99.1%; Moisture 12.4%) 57.6mg, be settled to 10ml with sterilized water, aseptic filtration, obtain 5mg/mL mother solution.
5. 0.4M D-Ser mother solution 0.25ml and 5mg/ml meropenem mother solution 0.512ml is mixed, be settled to 10ml with sterilized water, obtain the drug combination liquid of 10mM D-Ser and 256 μ g/ml meropenems.
6. 10mM D-Ser mother solution 0.1ml and 5mg/ml meropenem mother solution 0.512ml is mixed, be settled to 10ml with sterilized water, obtain the drug combination liquid of 0.1mM D-Ser and 256 μ g/ml meropenems.
7. 0.1mM D-Ser mother solution 0.1ml and 5mg/ml meropenem mother solution 0.512ml is mixed, be settled to 10ml with sterilized water, obtain the drug combination liquid of 0.001mM D-Ser and 256 μ g/ml meropenems.
The preparation of embodiment 2 D-Ser and meropenem drug combination liquid
1. take D-Ser powder (molecular weight 105.09, purity 98%) 3.43g.
2. take meropenem powder (purity 99.1%; Moisture 12.4%) 115.2g.
3. both are mixed, be settled to 10ml with sterilized water, obtain the drug combination liquid of 3.2M D-Ser and 10mg/ml meropenem.
The preparation of the antibacterial combination be made up of with antimicrobial active medicament and/or its derivant other D-aminoacid is carried out according to the description in embodiment 1 or embodiment 2.
Methicillin-resistant resistant Staphylococcus aureus (MRSA) activity research of embodiment 3 D-Ser and meropenem drug combination
1. get D-Ser (available from Sigma), be mixed with 0.4M mother solution with sterilized water, filter for subsequent use.Merrem (purchased from Hebei Zhongrun Pharmaceutical Co.ltd., Shiyao Group), is formulated as 5mg/mL mother solution with sterilized water.
2. meropenem is carried out two times of Concentraton gradient dilutions with the MH broth bouillon containing 0mM, 0.2mM, 2mM and 20mM D-Ser respectively, concentration range is 64 μ g/mL-0.03 μ g/mL.The amount of each concentration liquid by 100 μ L/ holes is added in aseptic 96 orifice plates.Establish simultaneously and do not contrast containing the strain growth of meropenem.
3. by MRSA reference culture ATCC 33591, ATCC 43300, N315, and Beijing area clinical separation strain 06-3,06-16,06-23,06-37,08-6,08-26,08-32,08-36,08-44,08-45,08-48,08-50 are inoculated in 1mL MH broth bouillon respectively, 37 ° of C overnight incubation.
4. the bacterium liquid of incubated overnight is adjusted to 0.5 Maxwell turbidity and (is about 1.0 × 10
8cFU/mL), then by 20 times of Concentraton gradient dilution conduct inoculation bacterium liquid, inoculum concentration is 10 μ L/ holes, and inoculum density is about 5.0 × 10
5cFU/mL.
5. 96 well culture plates are suitably wrapped up, prevent liquid excessive vaporization, be placed in 37 ° of C and cultivate 16-18h.
6. take out 96 well culture plates, observed result, the minimum antibiotic concentration of asepsis growth is minimal inhibitory concentration (Minimal Inhibitory Concentration, MIC).Result is as shown in table 1.
Table 1D-serine affects result to the anti-MRSA activity of meropenem
As can be seen from Table 1,20mM D-Ser and meropenem drug combination, can improve the antibacterial activity of meropenem, and with compared with D-Ser, MIC have dropped more than 32 times.The strain growth of each concentration D-Ser contrasts compared with not containing the growth control of D-Ser without significant difference.
The activity research of the anti-klebsiella pneumoniae of embodiment 4D-methionine and meropenem drug combination, escherichia coli, bacillus pyocyaneus
1. get D-methionine (available from Sigma), be mixed with 0.25M mother solution with sterilized water, filter for subsequent use.Merrem (purchased from Hebei Zhongrun Pharmaceutical Co.ltd., Shiyao Group), is formulated as 5mg/mL mother solution with sterilized water.
2. meropenem is carried out two times of Concentraton gradient dilutions with the MH broth bouillon containing 0mM, 0.2mM, 2mM and 20mM D-methionine respectively, concentration range is 8 μ g/mL-0.004 μ g/mL.The amount of each concentration liquid by 100 μ L/ holes is added in aseptic 96 orifice plates.Establish simultaneously and do not contrast containing the strain growth of meropenem.
3. by tested reference culture klebsiella pneumoniae ATCC 700603, escherichia coli ATCC25922, bacillus pyocyaneus ATCC 27853, bacillus pyocyaneus PAO1, and Beijing area Clinical isolation lung gram bacillus 7, escherichia coli 1515 are inoculated in 1mL MH broth bouillon respectively, 37 ° of C overnight incubation.
4. the bacterium liquid of incubated overnight is adjusted to 0.5 Maxwell turbidity and (is about 1.0 × 10
8cFU/mL), then by 20 times of Concentraton gradient dilution conduct inoculation bacterium liquid, inoculum concentration is 10 μ L/ holes, and inoculum density is about 5.0 × 10
5cFU/mL.
5. 96 well culture plates are suitably wrapped up, prevent liquid excessive vaporization, be placed in 37 ° of C and cultivate 16-18h.
6. take out 96 well culture plates, observed result, the minimum antibiotic concentration of asepsis growth is minimal inhibitory concentration (MIC).Result is as shown in table 2.
Table 2D-methionine is on the impact of the anti-klebsiella pneumoniae of meropenem, escherichia coli and bacillus pyocyaneus activity
As can be seen from Table 2,20mM D-methionine and meropenem drug combination, can improve the antibacterial activity of meropenem, and with compared with D-methionine, MIC have dropped 4-8 doubly.The strain growth of each concentration D-methionine contrasts compared with not containing the growth control of D-methionine without significant difference.
The anti-Staphylococcus aureus activity research of embodiment 5D-methionine and ampicillin, D-Ser and ampicillin and D-Thr and ampicillin drug combination
1. get D-methionine, D-Ser and D-Thr (available from Sigma), be mixed with 0.25M, 0.4M and 0.4M mother solution respectively with sterilized water, filter for subsequent use.Ampicillin standard substance (purchased from Nat'l Pharmaceutical & Biological Products Control Institute), are formulated as 5mg/mL mother solution with sterilized water.
2. two times of Concentraton gradient dilutions are carried out with the MH broth bouillon containing 0mM, 0.1mM, 10mM D-methionine, D-Ser or D-Thr respectively in ampicillin, concentration range is 512 μ g/mL-0.125 μ g/mL.The amount of each concentration liquid by 100 μ L/ holes is added in aseptic 96 orifice plates.Establish simultaneously and do not contrast containing the strain growth of ampicillin.
3. tested reference culture staphylococcus aureus ATCC 43300, staphylococcus aureus N315, staphylococcus aureus Mu50 are inoculated in 1mL MH broth bouillon respectively, 37 ° of C overnight incubation.
4. the bacterium liquid of incubated overnight is adjusted to 0.5 Maxwell turbidity and (is about 1.0 × 10
8cFU/mL), then by 20 times of Concentraton gradient dilution conduct inoculation bacterium liquid, inoculum concentration is 10 μ L/ holes, and inoculum density is about 5.0 × 10
5cFU/mL.
5. 96 well culture plates are suitably wrapped up, prevent liquid excessive vaporization, be placed in 37 ° of C and cultivate 16-18h.
6. take out 96 well culture plates, observed result, the minimum antibiotic concentration of asepsis growth is minimal inhibitory concentration (MIC).Result is as shown in table 3.
Table 3D-methionine, D-Ser and D-Thr are on the impact of ampicillin anti-Staphylococcus aureus activity
As can be seen from Table 3,10mM D-methionine and ampicillin drug combination, can improve the antibacterial activity 2-4 of ampicillin doubly; 10mM D-Ser and ampicillin drug combination, can improve the antibacterial activity 2-4 of ampicillin doubly; 10mM D-Thr and ampicillin drug combination, can improve the antibacterial activity 1-2 of ampicillin doubly.The contrast of each concentration D-amino acid whose strain growth with not containing compared with the amino acid whose growth control of D-without significant difference.
Anti-enterococcus faecalis, the enterococcus faecalis activity research of embodiment 6 D-methionine, D-Ser, D-Thr three kinds of D-aminoacid and meropenem drug combination
1. get D-methionine, D-Ser, D-Thr (available from Sigma), be mixed with 0.25M, 0.4M, 0.4M mother solution respectively with sterilized water, filter for subsequent use.Merrem (purchased from Hebei Zhongrun Pharmaceutical Co.ltd., Shiyao Group), is formulated as 5mg/mL mother solution with sterilized water.
2. preparation contains the brain heart infusion broth culture medium (Brain heart infusion, BHI) of three kinds of D-aminoacid (D-methionine, D-Ser, D-Thr) of 0.2mM, 2mM and 20mM respectively.
3. meropenem is carried out two times of Concentraton gradient dilutions with three kinds of amino acid whose BHI of D-containing 0mM, 0.2mM, 2mM and 20mM respectively, concentration range is 256 μ g/mL-0.125 μ g/mL.The amount of each concentration liquid by 100 μ L/ holes is added in aseptic 96 orifice plates.Establish simultaneously and do not contrast containing the strain growth of meropenem.
4. by tested reference culture enterococcus faecalis ATCC 51299, enterococcus faecalis ATCC29212, enterococcus faecalis ATCC 700802, enterococcus faecalis ATCC 51575 and enterococcus faecalis ATCC 700221, Clinical isolation enterococcus faecalis HH22 and enterococcus faecalis EFL4041 is inoculated in 1mL brain-heart broth culture medium respectively, 37 ° of C overnight incubation.
5. the bacterium liquid of incubated overnight is adjusted to 0.5 Maxwell turbidity and (is about 1.0 × 10
8cFU/mL), then by 20 times of Concentraton gradient dilution conduct inoculation bacterium liquid, inoculum concentration is 10 μ L/ holes, and inoculum density is about 5.0 × 10
5cFU/mL.
6. 96 well culture plates are suitably wrapped up, prevent liquid excessive vaporization, be placed in 37 ° of C and cultivate 16-18h.
7. take out 96 well culture plates, observed result, the minimum antibiotic concentration of asepsis growth is minimal inhibitory concentration (MIC).Result is as shown in table 4.
Anti-enterococcus faecalis, the enterococcus faecalis of table 4D-methionine, D-Ser, D-Thr three kinds of D-aminoacid and meropenem drug combination are active
As can be seen from Table 4, the D-methionine of 20mM, D-Ser, D-Thr three kinds of D-aminoacid and meropenem drug combination, can improve the antibacterial activity of meropenem.With compared with D-aminoacid, MIC have dropped 8-32 doubly.The contrast of each concentration D-amino acid whose strain growth with not containing compared with the amino acid whose growth control of D-, except three kinds of amino acid whose culture medium of D-containing 20mM have minimal effect to enterococcus faecalis ATCC 51299, other are without significant difference.
Anti-enterococcus faecalis, the enterococcus faecalis activity research of embodiment 7 D-methionine, D-Ser, D-Thr three kinds of D-aminoacid and vancomycin drug combination
1. get D-methionine, D-Ser, D-Thr (available from Sigma), be mixed with 0.25M, 0.4M, 0.4M mother solution respectively with sterilized water, filter for subsequent use.Vancomycin standard substance (purchased from Nat'l Pharmaceutical & Biological Products Control Institute), are formulated as 10mg/mL mother solution with sterilized water.
2. preparation contains the BHI of three kinds of D-aminoacid (D-methionine, D-Ser, D-Thr) of 0.2mM, 2mM and 20mM respectively.
3. vancomycin is carried out two times of Concentraton gradient dilutions with three kinds of amino acid whose BHI of D-containing 0mM, 0.2mM, 2mM and 20mM respectively, concentration range is 256 μ g/mL-0.125 μ g/mL.The amount of each concentration liquid by 100 μ L/ holes is added in aseptic 96 orifice plates.Establish simultaneously and do not contrast containing the strain growth of vancomycin.
4. strain subject enterococcus faecalis ATCC 51299, enterococcus faecalis HH22, enterococcus faecalis ATCC 29212, enterococcus faecalis ATCC 700802, enterococcus faecalis ATCC 51575, enterococcus faecalis EFL4041 and enterococcus faecalis ATCC 700221 are inoculated in 1mL brain-heart broth culture medium respectively, 37 ° of C overnight incubation.
5. the bacterium liquid of incubated overnight is adjusted to 0.5 Maxwell turbidity and (is about 1.0 × 10
8cFU/mL), then by 20 times of Concentraton gradient dilution conduct inoculation bacterium liquid, inoculum concentration is 10 μ L/ holes, and inoculum density is about 5.0 × 10
5cFU/mL.
6. 96 well culture plates are suitably wrapped up, prevent liquid excessive vaporization, be placed in 37 ° of C and cultivate 16-18h.
7. take out 96 well culture plates, observed result, the minimum antibiotic concentration of asepsis growth is minimal inhibitory concentration (MIC).Result is as shown in table 5.
Anti-enterococcus faecalis, the enterococcus faecalis of table 5D-methionine, D-Ser, D-Thr three kinds of D-aminoacid and vancomycin drug combination are active
As can be seen from Table 5, the D-methionine of 20mM, D-Ser, D-Thr three kinds of D-aminoacid and vancomycin drug combination, the activity of the anti-vancocin drug resistance enterococcus (enterococcus faecalis ATCC 51299, enterococcus faecalis ATCC 700802, enterococcus faecalis ATCC51575, enterococcus faecalis EFL4041 and enterococcus faecalis ATCC 700221) of vancomycin can be improved, with compared with D-aminoacid, MIC have dropped 8-16 doubly.And to the activity influence of the anti-non-Vancomycin-resistant Enterococcus (enterococcus faecalis HH22 and enterococcus faecalis ATCC 29212) of vancomycin not obvious (MIC is constant or decline 2 times).The contrast of each concentration D-amino acid whose strain growth with not containing compared with the amino acid whose growth control of D-, except three kinds of amino acid whose culture medium of D-containing 20mM have minimal effect to enterococcus faecalis ATCC 51299, other are without significant difference.
Embodiment 8 D-Ser is studied the clinical protective effect being separated Mrsa In Rabbits (MRSA) 08-50 infecting mouse with meropenem drug combination
1. clinical for Beijing area separation MRSA bacterial strain 08-50 being inoculated in 10mL increases in bacterial context soup (0.5%MH+2.5% yeast extract, autoclaving), transfers in 10mL fresh increasing bacterial context soup, continue overnight incubation (16-18h) after 37 ° of C cultivate 6h.
2. after the bacterium liquid of overnight incubation being carried out 100,1000,10000 times of dilutions, with the sterilised yeast suspension (w/v of 5%, use after autoclaving, yeast is purchased from sugar refinery, Dongguan, Guangdong Province yeast subsidiary factory) be mixed with to infect by the volume ratio of 1:9 and use bacterium liquid, carry out 1000,10000,100000 times of dilutions respectively.
3. choose 100 ICR mices (purchased from Beijing Vital River Experimental Animals Technology Co., Ltd.), male and female half and half, body weight 18-21g, be divided into 20 groups at random, often organize 5 (2 female 3 male or 2 male 3 female), a 0.5mL bacterium liquid/abdominal cavity infection mice, wherein all establishes contrast by the infectious bacteria liquid after 1000,10000,100000 times of dilutions, remains 12 groups and gives different pharmaceutical with after the bacterium liquid inductance dye after 10000 times of dilutions.
4. get D-Ser (available from Sigma) and Merrem (purchased from Hebei Zhongrun Pharmaceutical Co.ltd., Shiyao Group), be mixed with the drug combination liquid containing variable concentrations D-Ser and meropenem respectively with normal saline, as shown in table 6:
The pharmaceutical formulation of table 6D-serine and meropenem drug combination
5. after Murine Model of Intraperitoneal Infection, 1h and 6h is administered once respectively, and each 0.2mL/ only, observes animals survived number in 7 days.Analyze the curative effect of D-Ser and meropenem drug combination.Result is as shown in table 7,
Table 7D-serine and meropenem drug combination are to the therapeutical effect result (survival rate) of mouse infection MRSA bacterial strain 08-50
As can be seen from Table 7, when D-Ser is used alone to zoogenetic infection MRSA bacterial strain 08-50 without therapeutical effect; When meropenem is used alone; animal dis motility rate is up to 40%; and during the two drug combination >=200mM D-Ser+10mg/mL meropenem or 400mMD-serine+>=2.5mg/mL meropenem all can make the survival rate of animal to 100%, show that D-Ser and meropenem drug combination have good protective effect to Murine Model of Intraperitoneal Infection Mrsa In Rabbits 08-50.
Although above the present invention is described in detail with a general description of the specific embodiments, on basis of the present invention, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, all belong to the scope of protection of present invention.
Claims (4)
1. an antibacterial combination, is characterized in that, is made up of two kinds of components, and one is antimicrobial active medicament, the another kind of D-aminoacid for strengthening described antimicrobial active medicament antibacterial activity; Specifically be made up of D-Ser and meropenem, or be made up of D-methionine and meropenem, or be made up of D-methionine and ampicillin, or be made up of D-Ser and ampicillin, or be made up of D-Thr and ampicillin, or be made up of D-methionine, D-Ser, D-Thr three kinds of D-aminoacid and meropenem, or be made up of D-methionine, D-Ser, D-Thr three kinds of D-aminoacid and vancomycin.
2. antibacterial combination according to claim 1 is preparing the application in anti-infectives, and the antimicrobial spectrum of described anti-infectives is Gram-positive and/or gram negative bacteria and their fastbacteria.
3. application according to claim 2, is characterized in that, described gram-positive bacterium is: one or more in staphylococcus aureus, staphylococcus epidermidis, enterococcus faecalis, enterococcus faecalis, streptococcus pneumoniae, streptococcus pyogenes.
4. application according to claim 2, it is characterized in that, described gram negative bacteria is: one or more in Acinetobacter bauamnnii, klebsiella pneumoniae, escherichia coli, bacillus pyocyaneus, serratia marcescens, proteus mirabilis, proteus vulgaris, Mo Genmo Salmonella, special-shaped citrobacter, enterobacter cloacae, clostridium perfringen, thunder Ji Shi Pu Lufeideng bacillus.
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