Silver-Enhanced Antibiotic Permeability for Gram-Negative Infections
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Solution Overview
Problem
Current antibacterial agents are ineffective against Gram-negative bacteria due to their protective outer membrane, and there is a growing need for new treatments as antibiotic resistance increases, especially for infections caused by Gram-negative microbes.
Innovation Solution
Administering a sub-inhibitory level of silver in combination with antibiotics to enhance their efficacy and broaden their spectrum of activity, allowing Gram-positive antibiotics to effectively treat Gram-negative infections by increasing membrane permeability and potentiating the antimicrobial activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antibiotics are used alone to treat Gram-negative bacterial infections, then the treatment is simple and cost-effective, but the antibiotics are ineffective due to the protective outer membrane
Solution Approach 1:
Silver acts as an intermediary substance that penetrates the outer membrane of Gram-negative bacteria and facilitates the entry of antibiotics into the cell. The silver compound serves as a mediator that overcomes the membrane barrier, allowing the antibiotic to reach its target site and exert its therapeutic effect.
Solution Approach 2:
The treatment uses a composite approach by combining silver compound and antibiotic together. This composite therapeutic strategy leverages the membrane-penetrating capability of silver to deliver the antibiotic effectively against Gram-negative bacteria, creating a synergistic effect that overcomes individual treatment limitations.
2Reliability
If high doses of silver are used alone to treat Gram-negative infections, then the antimicrobial activity is sufficient, but the dose is toxic and not clinically viable
Solution Approach 1:
Instead of using a full toxic dose of silver, the invention employs a sub-inhibitory (partial) dose of silver that alone would be insufficient to kill the bacteria but effectively potentiates the antibiotic's action. This partial action of silver, when combined with the antibiotic, achieves complete bacterial eradication without reaching toxic silver levels.
Solution Approach 2:
The invention merges silver compound and antibiotic into a combination therapy where the sub-toxic silver dose works synergistically with the antibiotic. This merging of two agents allows the silver to enhance antibiotic penetration and activity while the antibiotic provides the primary bactericidal effect, together achieving effective treatment at lower, non-toxic silver doses.
3Adaptability or versatility
If Gram-positive specific antibiotics are used to treat Gram-negative infections, then the treatment is simple, but the antibiotics cannot penetrate the outer membrane and are ineffective
Solution Approach 1:
Silver serves as an intermediary that enables Gram-positive specific antibiotics to penetrate the outer membrane of Gram-negative bacteria. The silver compound facilitates the passage of these otherwise membrane-impermeable antibiotics, expanding their adaptability to treat Gram-negative infections while maintaining their original mechanism of action.
Solution Approach 2:
The invention changes the membrane permeability parameter of the bacterial outer membrane through silver exposure. This parameter change allows antibiotics that normally cannot penetrate the membrane to now access the bacterial cell interior, effectively broadening the spectrum of Gram-positive specific antibiotics to include Gram-negative pathogens.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The combination of silver and antibiotics at sub-inhibitory doses effectively treats Gram-negative bacterial infections by increasing membrane permeability and enhancing the antimicrobial activity, overcoming the protective outer membrane barrier and expanding the antibiotic's range of effectiveness.
Implementation Method 1
silver can increase membrane permeability of microbes, e.g., Gram-negative microbes, thus enabling delivery of an agent that cannot be delivered otherwise into the microbes
Implementation Method 2
silver, at least partly, disrupt bacterial cellular processes and pathways, including disulfide bond formation, central metabolism and/or iron homeostasis. These changes can lead to increases in membrane permeability and the production of reactive oxygen species (ROS)
Implementation Method 3
the production of reactive oxygen species (ROS)
Data Source
AI summary
Provided herein are methods and compositions for treatment of a microbial infection or a microbial biofilm in a subject or on a surface by administering to the subject or surface determined to have or suspected of having a microbial infection/film an antimicrobial agent in combination with a silver-containing compound (e.g., a silver salt). In some embodiments, a silver-containing compound can increase activity of the antimicrobial agent. In other embodiments, addition of a silver-containing compound to an antimicrobial agent can expand the antimicrobial spectrum of the antimicrobial agent such that the antimicrobial agent originally indicated for treatment of one microbial strain (e.g., Gram-positive microbes) becomes effective for treating additional microbial strains (e.g., Gram-negative microbes). Other aspects relating to methods and compositions for delivering an agent to a microbe by increasing the membrane permeability of the microbe are also provided herein.