Pharmaceutical composition for resisting methicillin-resistant staphylococcus aureus (mrsa)

A technology of anti-methicillin and composition, applied in the directions of drug combination, antibacterial drug, active ingredient of heterocyclic compounds, etc., can solve the problem that the treatment cannot meet the clinical needs, etc., and achieve the effect of preventing and treating infection

Inactive Publication Date: 2015-10-14
CHINA PHARM UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, MRSA with intermediate resistance to vancomycin (VISA) or resistance (VRSA) has appeared in Japan and the United States in recent years, which has brou

Method used

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  • Pharmaceutical composition for resisting methicillin-resistant staphylococcus aureus (mrsa)
  • Pharmaceutical composition for resisting methicillin-resistant staphylococcus aureus (mrsa)
  • Pharmaceutical composition for resisting methicillin-resistant staphylococcus aureus (mrsa)

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Cbf-K 16 Effect of combined use with ceftazidime on the death protection rate of MRSA-infected mice

[0048] The experiment uses about 20g of ICR mice, half male and half male, randomly divided into 7 groups, set as blank group, model group, Cbf-K 16 group (40mg / kg / d), ceftazidime group (80mg / kg / d), low dose combination group (Cbf-K 16 20mg / kg / d, ceftazidime 80mg / kg / d), medium-dose combination group (Cbf-K 16 40mg / kg / d, ceftazidime 80mg / kg / d), high-dose combination group (Cbf-K 16 80mg / kg / d, ceftazidime 80mg / kg / d). After 2 days of adaptive culture, the experiment was started. Except for the blank group, mice in other groups were intraperitoneally injected with 5×10 8 CFU of MRSA, Cbf-K 16 0.5h and 2h after infection were administered intraperitoneally, ceftazidime was administered via tail vein at 0h and 6h after infection, the survival status was observed for 7 consecutive days, the number of deaths was recorded, and the death protection rate was calculated.

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Embodiment 2

[0053] Cbf-K 16 Effects of combined use with ampicillin on the death protection rate of MRSA-infected mice

[0054] The experiment uses about 20g of ICR mice, half male and half male, randomly divided into 7 groups, set as blank group, model group, Cbf-K 16 group (40mg / kg / d), ampicillin group (80mg / kg / d), low-dose combination group (Cbf-K 16 20mg / kg / d, ampicillin 80mg / kg / d), medium-dose combination group (Cbf-K 16 40mg / kg / d, ampicillin 80mg / kg / d), high-dose combination group (Cbf-K 16 80mg / kg / d, ampicillin 80mg / kg / d). After 2 days of adaptive culture, the experiment was started. Except for the blank group, mice in other groups were intraperitoneally injected with 5×10 8 CFU of MRSA, Cbf-K 16 0.5h and 2h after infection, intraperitoneal administration, ampicillin 0h and 6h after infection tail vein administration, 7 days to observe the survival status, record the number of deaths, and calculate the death protection rate.

[0055] Table 5 Cbf-K 16 and ampicillin on the d...

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Abstract

The invention relates to a pharmaceutical composition for resisting methicillin-resistant staphylococcus aureus (mrsa). The pharmaceutical composition has an mrsa infection-resistant effect. Ceftazidime and ampicillin have the effect of inhibiting the synthesis of a bacterial cell wall, while cbf-k16 is a cationic antimicrobial peptide and has a cell membrane penetrating effect. The in-vitro antibacterial activity of the peptide cbf-k16 and ceftazidim or ampicillin which are combined to be used is researched by using a chessboard method and a bactericidal curve method, and the result shows that the pharmaceutical composition has remarkable in-vitro synergic mrsa-resistant activity. Meanwhile, in-vivo researches show that the pharmaceutical composition composed of the peptide cbf-k16 and ceftazidim or ampicillin has a remarkable effect on treating animal generalized infection caused by mrsa, and therefore the pharmaceutical composition is proved to have remarkable in-vivo and in-vitro synergic antibacterial activity for mrsa and have a relatively good application prospect on the aspect of clinically treating diseases infected by mrsa.

Description

technical field [0001] The present invention relates to a pharmaceutical composition for synergistically resisting methicillin-resistant Staphylococcus aureus (MRSA) infection, the pharmaceutical composition comprising antimicrobial peptide Cbf-K 16 and an antibiotic selected from ceftazidime or ampicillin. Background technique [0002] Antibiotics have greatly extended human life since they were used in the treatment of bacterial infections. However, with the extensive use of antibiotics, the problem of antibiotic resistance has become increasingly serious, and the rate of bacterial resistance has far exceeded the rate of development of new antibiotics. Staphylococcus aureus is one of the main pathogens of clinical infection, which can cause skin and soft tissue infection, pneumonia, bacteremia, surgical site and catheter-related infection, etc., seriously endangering human health. In the past 20 years, MRSA has become an important pathogen of nosocomial infection and has...

Claims

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Application Information

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IPC IPC(8): A61K38/16A61P31/04A61P11/00A61P19/02A61P9/00A61P17/00A61P17/02A61P39/02A61K31/546A61K31/43
Inventor 周长林康玮刘含含李博王嫣蓉窦洁王慧
Owner CHINA PHARM UNIV
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