Profile of resistance to quinolones of European countries (2015 vs. 2018).
\r\n\tKey Features:
\r\n\t*Reviews the basics of plating technology including electroless and immersion technologies
\r\n\t*Covers microjoining and nanojoining processes in various device applications
\r\n\t*Examines applications of microjoining such as the wafer level packaging, biomedical research, medical implants etc.
Antimicrobial resistance has become a serious public health problem in recent years. This problem has been increasing and is currently a truly global crisis that offers one of the worst forecasts of catastrophic scenarios in public health worldwide.
\nA sign of the seriousness of the problem is the fact that World Health Organization (WHO)\'s new Global Antimicrobial Surveillance System (GLASS) reported the widespread occurrence of antibiotic resistance among 500,000 people with suspected bacterial infections across 22 countries [1].
\nLikewise, Centers for Disease Control (CDC)‘s Antibiotic Resistance Threats in the United States (US), in 2019 (2019 AR Threats Report), reported that more than 2.8 million antibiotic-resistant infections occur in the US each year, and more than 35,000 people die as a result. Besides, 223,900 cases of Clostridium difficile occurred in 2017 and at least 12,800 people died [2].
\nMany bacteria produce important infections in human health, either due to community-acquired infections, nosocomial infections, or at intensive care units. Among these, many have an important phenotypic profile of antibiotic resistance. For example, Staphylococcus aureus, Enterococcus spp., Enterobacteriaceae (other than Salmonella and Shigella), Pseudomonas aeruginosa, and Acinetobacter spp. [3, 4].
\nTo classify these microorganisms according to the degree of resistance and acquired resistance profiles, a group of experts in the field of antimicrobial resistance in joint work with the European Center for the Prevention of Diseases and Control (ECDC) and the CDC established the definitions and characteristics among resistant bacteria: multidrug-resistant (MDR), extensively drug-resistant (XDR), and pan drug-resistant (PDR) bacteria [3, 4].
\nTo establish objective parameters of the phenotypic resistance profile in each of these bacteria, epidemiologically significant antimicrobial categories were established. These categories were established based on the documents and cut-off points of the Clinical Laboratory Standards Institute (CLSI), the European Antimicrobial Sensitivity Testing Committee (EUCAST), and the US Food and Drug Administration (FDA) [3, 4].
\nBased on the new limits and definitions: MDR bacteria possess acquired resistance to at least one antibiotic of three or more categories; XDR bacteria possess resistance to at least one antibiotic of almost all categories, except one or two of them; and PDR bacteria are resistant to all agents of all categories of antimicrobials [3, 4].
\nAntimicrobial resistance has been observed in all families of antibiotics, including the latest generation and intrahospital antibiotics such as quinolones.
\nThe wide use of quinolones in clinical practice includes the administration of the antibiotic in prophylaxis, in neutropenic patients with cancers, in cirrhotic patients at risk for spontaneous bacterial peritonitis, and in urologic surgery, among others. In many of these cases, strains with varying degrees of resistance to quinolones have been isolated [5, 6].
\nIn 1962, quinolones were discovered as an important treatment for various pathological manifestations. The first one was nalidixic acid, which was synthetically produced by George Lesher at the Sterling-Winthrop Research Institute. It was synthesized from the isolation of chloro-1-ethyl-1,4-dihydro-4-oxo-3-quinoline carboxylic acid years before, as a product derived from the synthesis of chloroquine [7]. Its origin dates back to the use of chloroquine as an antimalarial agent. It was until years after its development that nalidixic acid was approved for the treatment of urinary tract infections by Gram-negative bacteria. This compound does not have an important effect on Gram-positive bacteria, in addition to having a certain cytotoxic effect on the gastrointestinal tract and the central nervous system. Its effect on Gram-negative bacteria is characteristic of the first generation of quinolones [8].
\nThe indiscriminate prescription of quinolones worldwide has led to a rapid increase in bacterial resistance. Acinetobacter spp., Campylobacter spp., Capnocytophaga spp., Clostridium spp., Escherichia coli, Klebsiella pneumoniae, Mycobacterium tuberculosis, Neisseria gonorrhea, Proteus mirabilis, P. aeruginosa, Salmonella spp., S. aureus, and Streptococcus pneumoniae, among others, have been reported as resistant [7, 9, 10].\n
\nThe ECDC collects and reports through the European Antimicrobial Resistance Surveillance Network (EARS-Net) information of seven bacterial pathogens that commonly cause infections in humans: Acinetobacter spp., Enterococcus faecalis, Enterococcus faecium, Escherichia coli, Klebsiella pneumoniae, Staphylococcus aureus, Streptococcus pneumoniae, and Pseudomonas aeruginosa. Information comparing their profile of resistance to quinolones in Europe between 2015 and 2018 can be found in Table 1 [11, 12].\n
\nBacteria | \nMean resistance percentage | \nCountry with the lowest resistance percentage | \nCountry with the highest resistance percentage | \n|||
---|---|---|---|---|---|---|
2015 | \n2018 | \n2015 | \n2018 | \n2015 | \n2018 | \n|
\nAcinetobacter spp. | \n43.7% | \n36.2% | \nBelgium (0%) | \nNorway (0%) | \nGreece (94.9%) | \nCroatia (96.1%) | \n
\nEscherichia coli\n | \n22.8% | \n25.3% | \nIceland (6.8%) | \nFinland (11.4%) | \nCyprus (45.5%) | \nCyprus (42.4%) | \n
\nKlebsiella pneumoniae\n | \n29.7% | \n31.6% | \nIceland (2.9%) | \nIceland (0%) | \nSlovakia (70%) | \nPoland (68.2%) | \n
\nPseudomonas aeruginosa\n | \n19.3% | \n19.7% | \nEstonia (0%) | \nMalta (0%) | \nRomania (59%) | \nSlovakia (52.4%) | \n
The structure of quinolones derives from two types of rings, a naphthyridine core with a nitrogen molecule in positions 1 and 8. Through this structure, the compound is limited to being used as a therapy against Gram-negative bacteria. However, it has been shown that by inserting a cyclopropyl group in the first position of the nitrogen ring, an effect is achieved not only on Gram-negative bacteria but also on Gram-positive ones (Figure 1) [13, 14].
\nMolecular structure of representative members of each quinolone generation. Based on PubChem public archive https://www.ncbi.nlm.nih.gov/pcsubstance [14, 17, 19, 20].
The second generation was developed in 1980, from the addition of a fluorine atom at position six, resulting in fluoroquinolones. These have higher activity in Gram-negative bacteria, as well as Gram-positive bacteria. Some fluoroquinolones can inhibit all Gram-negative organisms. Quinolones with piperazine on carbon 7 are effective in Gram-negative bacteria and the signaling of topoisomerase 4 (Figure 1) [13, 15, 16, 17].
\nLater, the third generation arises by adding certain molecules in the rings, such as the cyclopropyl ring in the first position of nitrogen, improving the activity in Gram-positive bacteria. Some of these modifications achieved sensitivity in organism resistant to different antibiotics, including Streptococcus pneumoniae. Other benefits of this generation are a longer life in serum and activity against anaerobic organisms (Figure 1) [7, 18, 19].
\nThe fourth generation was later developed by incorporating nitrogen in the eighth position, resulting in a broad-spectrum antibiotic. Its action in some Gram-positive organisms is more effective compared to the other generations; however, its activity in anaerobic organisms is limited. It has a superior bacterial selectivity to avoid a high level of resistance and its toxic effects are less unfavorable than in the other generations [7, 8]. Thanks to the modifications made to the quinolones, an improvement in its pharmacokinetics and pharmacodynamics has been obtained, thus optimizing absorption, metabolism, and elimination, achieving lower toxicity and superiority in the mechanisms of action. It has also been possible to modify the half-life of the drug making only one dose per day necessary (Figure 1) [20].
\nCurrently, nine fluoroquinolones have been approved in the US while others continue to be used in clinical trials. Information regarding the generations, compounds, and spectrum of activity can be found in Table 2.
\nGeneration | \nCompounds | \nActivity spectrum | \n|
---|---|---|---|
1 | \nNalidixic acid | \nGram-negative bacteria (not Pseudomonas spp.) | \n|
2 | \n2a | \nCiprofloxacin, enoxacin, norfloxacin | \nGram-negative bacteria and atypical pathogens (Mycoplasma pneumoniae and Chlamydia pneumoniae) | \n
2b | \nLevofloxacin, lomefloxacin, ofloxacin | \nGram-negative bacteria, Gram-positive bacteria (not Streptococcus pneumoniae), and atypical pathogens | \n|
3 | \nClinafloxacin, gatifloxacin, grepafloxacin, sparfloxacin. | \nGram-negative bacteria, Gram-positive bacteria (Streptococcus pneumoniae) and improved activity against atypical pathogens | \n|
4 | \nGatifloxacin, gemifloxacin, moxifloxacin, trovafloxacinin | \nGram-negative bacteria, Gram-positive bacteria (Streptococcus pneumoniae) and improved activity against atypical and anaerobic pathogens | \n
It has been reported that several agents such as Escherichia coli, Klebsiella pneumoniae, Neisseria gonorrhoeae, or Staphylococcus aureus have presented significant resistance to quinolones [21]. Plasmid-mediated quinolone resistance (PMQR) was a completely unexpected event since it was thought that the only mutation would occur in genes encoding topoisomerase II identification. Currently, the resistance mechanism is multifactorial. However, the most common quinolone resistance mechanism is topoisomerase mutations [15, 22].
\nThe excessive use of this type of drug has caused the incidence rates of hypersensitivity to increase more and more, taking the second place of antibiotics with a greater number of hypersensitivity reactions in in-hospital patients. The main agents that cause hypersensitivity are ciprofloxacin, levofloxacin, and moxifloxacin. This has positioned quinolones as the non-beta-lactam antibiotics with the highest incidence of hypersensitivity reactions [23, 24].
\nThe mechanism of action of quinolones is based on the inhibition of bacterial topoisomerases II and IV. Topoisomerases are enzymes responsible for maintaining the tertiary structure of DNA during various cellular processes, such as synthesis, replication, condensation, and decondensation of DNA, among others [25, 26, 27, 28, 29].
\nTopoisomerase II, also known as DNA gyrase, is considered a negative supercoiling enzyme, which means that it cuts the two strands of DNA and propitiates that the DNA is twisted to the left producing a twist in a way contrary to the direction of the double helix. This enzyme participates in the DNA winding and relaxation during various processes, mainly in the synthesis and replication of DNA [30, 31].
\nThe DNA gyrase consists of a heterotetramer, which is formed by two GyrA subunits and two GyrB subunits. The GyrA subunits participate in the union with the DNA and are responsible for making the double helix cuts. The GyrB subunits possess ATPase activity [30].
\nTopoisomerase IV is responsible for preventing the chromatids from being chained, meaning it participates in the separation of daughter chromatids after DNA replication [32].
\nLike DNA gyrase, topoisomerase IV is made up of a tetramer. It has two ParC subunits and two ParE subunits. These subunits possess homologous activity of GyrA and GyrB, respectively [32].
\nWhen quinolones interact and inhibit topoisomerase II and IV, it induces DNA breakdown and cell death due to genotoxic damage [27, 28, 29].
\nTo counteract the effect of quinolones, bacteria have developed various resistance mechanisms to these antibiotics. Bacterial resistance to quinolones is mainly based on three points (Table 3, Figure 2):
Chromosomal mutations in coding genes (mutations that alter the objectives of the drug).
Mutations associated with the reduction of the intracytoplasmic concentration of quinolones.
PMQR genes (plasmids that protect cells from the lethal effects of quinolones) [33].
Mechanism | \nDescription | \n||
---|---|---|---|
Chromosomal mutations in coding genes | \nOccurs due to errors in the replication of the genes encoding the GyrA subunits of DNA gyrase and ParC of topoisomerase IV | \n||
Mutations associated with the reduction of the intracytoplasmic concentration of quinolones | \nOccurs due to mutations that lead to a decrease in the intracytoplasmic concentration of the antibiotic. It may happen through: | \n||
Overexpression of efflux pumps from the resistance-nodulation-cell division | \nBoth | \nReduction of the membrane permeability by downregulation of extra-membrane proteins | \n|
Plasmid-mediated quinolone resistance genes | \nOccurs due to the activation of plasmid-mediated quinolone resistance genes. Among them are: | \n||
Qnr’s encode proteins that protect DNA gyrase and topoisomerase IV | \nAAC(6′)-lb-cr acetylates quinolones with an appropriate amino nitrogen target | \nQepA and OqxAB, which increase the outflow of quinolones through efflux pumps | \n
Mechanisms of resistance to quinolones.
Adapted from: Álvarez-Hernández DA, Garza-Mayén GS, Vázquez-López R. Quinolones. Nowadays perspectives and mechanisms of resistance [34].
Schematic representation of the mechanisms of bacterial resistance to quinolones. Based on Susana Correia et al. [22].
The quinolone resistance associated with chromosomal mutations occurs due to errors in the replication of the genes encoding the GyrA subunits of DNA gyrase and ParC of topoisomerase IV [33, 35].
\nIn the amino acid sequences of the GyrA and ParC subunits, there are specific regions that interact with the DNA. In these regions, there are conserved domains called quinolone resistance determining region (QRDR) [31, 35, 36, 37, 38, 39].
\nIt is precisely in the sequences that code for each of the QRDR domains of the GyrA and ParC subunit genes, where such mutations occur [31, 35, 36, 37, 38, 39].
\nIt has been reported that quinolone resistance may also occur due to mutations in the genes encoding the GyrB and ParE subunits; however, they do not occur so frequently and their clinical value appears to be very limited [35, 40, 41].
\nThere is evidence that in Gram-negative bacteria, DNA gyrase turns out to be more susceptible to inhibition than topoisomerase IV. On the other hand, in Gram-positive bacteria, the opposite phenomenon occurs; that is, that topoisomerase IV is more susceptible to inhibition than gyrase. However, certain bacteria show the opposite effect, being the exception to the rule [31, 42, 43].
\nTherefore, we can affirm that the phenomenon of resistance in the majority of Gram-negative bacteria occurs mainly in GyrA, while in most Gram-positive bacteria the inhibition of ParC is the most important [31, 42, 43].
\nSummarizing, mutations that occur in the sequences encoding the QRDR domains in both GyrA-ParC and GyrB-ParE favor a decrease in the binding affinity of quinolones with the DNA–DNA gyrase and DNA-topoisomerase IV complex [33, 35].
\nAnother important quinolone resistance mechanism consists in the ability of the bacteria to decrease the intracytoplasmic concentration of the antibiotic; this decrease in concentration is determined by certain mutations.
\nThis phenomenon is achieved through three mechanisms:
Efflux pumps that promote the active transport of quinolones to the outside of the bacterial cell.
Decreased membrane permeability toward the antibiotic.
A combination of both mechanisms.
It has been described that only efflux pumps participate in Gram-positive bacteria as mechanisms to reduce the intracytoplasmic concentration of quinolones since there is no evidence that the decrease in cytoplasmic membrane permeability participates in this type of bacteria [44].
\nOn the other hand, Gram-negative bacteria do have both mechanisms and participate in a complementary way with one another, the decrease in permeability in the cytoplasmic membrane being the most important for these bacteria [45].
\nThese two mechanisms involved in the decrease of the intracytoplasmic concentration of quinolones are not induced by the drugs themselves. There is evidence that these two mechanisms occur because of mutations in genes that encode regulatory proteins that control transcription of the outflow pump or genes that code for porin synthesis [35, 46].
\nThis resistance mechanism in Gram-positive bacteria is associated with the presence of chromosomally encoded efflux pumps that decrease the intracytoplasmic concentration of the antibiotic, giving the bacteria the characteristic of being MDR.
\nEfflux pumps are classified into two groups: primary active transporters and secondary active transporters [47].
\nThe primary active transporter proteins are pumps that use ATP as a source of energy. This type of primary active transporter integrates the members of the ATP-binding cassette (ABC) superfamily [48, 49, 50].
\nOn the other hand, the secondary active transporter proteins use the energy obtained by the difference of chemical gradients formed by either protons or ions, for example, sodium ions [48, 49].
\nFour types of secondary active transporter proteins have been identified: [47, 48, 49].
The small multidrug-resistance (SMR) family
The major facilitator superfamily (MFS)
Multidrug and toxic compound extrusion (MATE) family
The resistance-nodulation-cell division (RND) superfamily.
Members of this family are proteins made up of an antiparallel dimer. Each monomer of this dimer has four transmembrane helices (TM1, TM2, TM3, and TM4). The TM 1 to M3 helices comprise the substrate binding pocket, while each TM4 helix is responsible for SMR TM4-TM4 dimerization [51, 52, 53].
\nThe members of the SMR family are associated with resistance to various toxic compounds and some antibiotics; however, they do not appear to play a relevant role in resistance to quinolones.
\nConcerning efflux pumps related to the intracytoplasmic decrease in quinolone and consequently linked to resistance to this drug, they are efflux pumps that are part of the MFS. Three members of this family associated with quinolone resistance have been identified: NorA, NorB [50], and NorC [54]. Overexpression of each of three efflux pumps increases resistance to quinolones four to eight times [33].
\nThe chromosomal gene that codes for NorA could be identified in 1986 from the isolation of Staphylococcus aureus obtained from a urine sample from a patient who had received treatment with norfloxacin at Teikyo University Hospital Japan [55]. It has been observed that NorA participates in the pumping of various quinolones, mainly ciprofloxacin and norfloxacin [56, 57].
\nSubsequent studies of genetic diversity described three alleles for the NorA gene [58]: NorAI (Yoshida), NorAII (Noguchi), and NorAIII (Kaatz). A correlation has been observed between the different types of NorA alleles and specific lineages of S. aureus. This fact suggests that there is a correlation between the NorA variants and the population structure (lineages) of this bacterium [58].
\nIt has been described that the expression of the efflux pump NorB gives certain bacteria (e.g., Staphylococcus aureus) the adaptability in tissue infection conditions, even in the absence of antibiotics. This fact occurs because NorB gives Staphylococcus aureus the ability to eliminate antibacterial substances present in the abscess and produced as a defense mechanism by the host. In this way, NorB not only participates in the quinolone resistance mechanism but also contributes to the pathophysiology of certain infections [59].
\nThe efflux pump Norc enhances the exit of quinolones such as ciprofloxacin, garenoxacin moxifloxacin, and sparfloxacin out of the bacterial cell. Its expression is regulated negatively by MgrA [54].
\nMany regulatory proteins participate in a complex regulatory process in the gene expression of NorA, NorB, and NorC. One of these regulatory proteins is MgrA, which shows the ability to bind to the NorA promoter region. The overexpression of MgrA causes the inhibition of the expression of NorA, NorB, and NorC, in the opposite, resistance to quinolones is associated with a low activity of MgrA and the consequent overproduction of NorA, NorB, and NorC that will promote a decrease in the intracytoplasmic concentration of the drug [54, 60, 61, 62].
\nThere is evidence that MgrA activity could be determined by environmental conditions in which the bacterium is found. Acid conditions, oxidative, as well as the presence of iron, could alter the activity of MgrA and consequently the expression of NorA, NorB, and NorC and its effect on the pumping of quinolone and its concentration in the bacterial cytoplasm [35, 59, 63, 64, 65].
\nOn the other hand, another transcriptional regulator, called NorG, which activates the expression of NorA and NorB but suppresses the expression of NorC, has been described. It is important to understand that the regulation of the gene expression of NorA, NorB, and NorC results from a complex molecular framework where both activators and inhibitors participate and the balance between them, as well as the environmental and nutritional conditions in which the bacteria develops, will give as a result the resistance or the lack of it to quinolones [35, 61, 62, 66].
\n\nMdeA gen was identified in an open reading frame (ORF) expression library of the S. aureus genome. The efflux pump protein MdeA belongs to the MFS using the proton motive force to energize the transport of its substrates [67, 68].
\nMdeA confers resistance to the biocides benzalkonium chloride, dequalinium, tetraphenylphosphonium, and to the dye ethidium bromide [67]. MdeA also confers resistance to multiple antibiotics among which are fusidic acid, mupirocin, novobiocin, and virginiamycin, and to some extent toward ciprofloxacin and norfloxacin [67, 68].
\nIn 2006 Yamada et al. cloned a new gene called SA1972 isolated from Staphylococcus aureus. The product obtained was called SdrM and it was proven that it conferred resistance to the bacteria against, acriflavine, ethidium bromide, and norfloxacin. SdrM was classified as an efflux pump belonging to the MFS [69].
\nThe qacA and qacB genes that code for efflux pump proteins (QacA and QacB, respectively) are present in methicillin-resistant Staphylococcus aureus (MRSA). The efflux pump QacA has two isoforms, while the pump QacB has four known as QacBI, QacBII, QacBIII, and QacBIV. It has been observed that the QacBIII variant confers resistance to S. aureus to fluoroquinolones [70].
\nThe efflux pump MepA belongs to the multidrug and toxic compound extrusion (MATE) family. MepA gives the bacterium a phenotypic MDR profile associated with low-level resistance to some quaternary ammonium compounds. It also confers resistance to certain antibiotics, mainly toward glycylcyclines and to a lesser extent resistance to ciprofloxacin and norfloxacin [71, 72, 73].
\nIn addition to the efflux pump described above, there are other transporters in Gram-positive bacteria that participate in the decrease in the intracytoplasmic concentration of quinolones in the bacterial cell, participating in resistance to this drug. Some of these transporters are LmrS, Bmr, Bmr3 and Blt, PmrA66, LmrP67, PatAB69, SatAB70, LmrA71, FepA, FepR, and TetR [35].
\nGram-negative bacteria use efflux pumps belonging to the RND superfamily as the main mechanism of resistance to quinolones. The efflux pump RND pumps are a molecular complex consisting of three elements (Figure 3) [49, 74, 75, 76, 77]:
In the inner membrane is RND pump protein.
An adapter protein from the MFP (membrane fusion protein) family located in the periplasmic space.
In the outer membrane is an outer membrane channel protein (OMP) belonging to the outer membrane factor (OMF) family.
Schematic representation of molecular structure of RND (resistance-nodulation-cell division superfamily). Based on Eun-Hae Kim et al. [77].
The adapter protein MFP links the pump RND and the OMF protein [49, 74, 75, 76, 77].
\nIn E. coli, the presence of five RND efflux transporters has been reported:
\n\nThe AcrAB-TolC or acriflavine (Acr) efflux system consists of three elements [75, 87]:
The outer-membrane channel TolC
In the periplasmic space is the AcrA protein, which bridges these two integral membrane proteins
In the inner membrane is the secondary transporter AcrB.
There is evidence that the ratio between the proteins that make up this complex is 3: 6: 3, comprising an AcrB trimer, an AcrA hexamer, and a TolC trimer [75, 87].
\nIt has been shown that various dyes can be accommodated in the transmembrane domain of the Acr efflux system, as well as doxorubicin, minocycline, and quinolone molecules [88, 89].
\nAcrAD is an antibiotic efflux pump complex of the RND type. It provides resistance to aminoglycosides such as amikacin, gentamicin, and tobramycin. There is no known effect on quinolone resistance [80, 90].
\nAcrEF is an antibiotic efflux pump complex of the resistance-nodulation-cell division (RND) type. It provides resistance to cephalosporins, cephamycins, fluoroquinolones, and penams [91, 92].
\nMdtABC is an antibiotic efflux pump complex of the resistance-nodulation-cell division (RND) type. It provides resistance to aminocoumarins, which have a mechanism of action similar to quinolones [93, 94].
\nMdtEF is an antibiotic efflux pump complex of the RND type. It provides resistance to fluoroquinolones, macrolides, and penams [82].
\nMexAB-OprM efflux system is an antibiotic efflux pump complex of the RND type. It provides resistance to multiple antibiotics, including aminocoumarins, carbapenems, cephalosporins, cephamycins, diaminopyrimidines, fluoroquinolones, macrolides, monobactams, penams, phenicols, peptides, sulfonamides, and tetracyclines [95, 96].
\nMexCD-OprJ with type A NfxB mutation is an antibiotic efflux pump complex of the RND type. It provides resistance to the aminocoumarins, cephalosporins, diaminopyrimidines, fluoroquinolones, macrolides, penams, phenicols, and tetracyclines [97].
\nMexCD-OprJ with type B NfxB mutation is an antibiotic efflux pump complex of the RND type. It provides resistance to the aminocoumarins, aminoglycosides, cephalosporins, diaminopyrimidines, fluoroquinolones, macrolides, penams, phenicols, and tetracyclines [97].
\nMexEF-OprN is an antibiotic efflux pump complex RND. It provides resistance to diaminopyrimidines, fluoroquinolones, and phenicols [98].
\nMexXY-OprM is an antibiotic efflux pump complex RND. It provides resistance to the acridine dye, aminoglycosides, carbapenems, cephalosporins, cephamycins, fluoroquinolones, macrolides, penams, phenicols, and tetracyclines [96, 99, 100].
\nCmeABC is an antibiotic efflux pump complex RND. It provides resistance to cephalosporins, fluoroquinolones, fusidic acid, and macrolides [101, 102].
\nAdeIJK is an antibiotic efflux pump complex RND. It provides resistance to carbapenems, cephalosporins, diaminopyrimidines, fluoroquinolones, lincosamides, macrolides, penems, phenicols, rifamycins, and tetracyclines [103].
\nAdeABC is an antibiotic efflux pump complex RND. It provides resistance to glycylcyclines and tetracyclines [104, 105].
\nAdeL is an antibiotic efflux pump complex RND. It provides resistance to fluoroquinolones and tetracyclines [106].
\nSmeDEF is an antibiotic efflux pump complex RND. It provides resistance to fluoroquinolones, macrolides, phenicols, and tetracyclines [107].
\nOther molecular complexes associated with decreasing the intracytoplasmic concentration of antibiotics in Gram-negative bacteria include:
\nEmrAB-TolC is an antibiotic efflux pump belonging to MFS. It provides resistance to fluoroquinolones [108].
\nOther molecular complexes associated with decreasing the intracytoplasmic concentration of antibiotics in Gram-negative bacteria include:
\n\nIn 1998 at the University of Alabama, from the isolation of Klebsiella pneumoniae from a urine sample, Martinez et al. managed to identify a plasmid they named pMG252. They demonstrated that this plasmid induced bacterial resistance to fluoroquinines and nalidixic acid. This resistance phenomenon could be induced in a variety of bacteria deficient in outer-membrane porins. They also described that this plasmid promoted the acceleration of resistance development and its propagation. The gene responsible for this resistance was called qnr, later it became qnrA [113, 114].
\nIn 2002, Tran and Jacoby, working with the qnr plasmid, managed to identify an integron-like environment upstream from qacEΔ1 and sulI. The product obtained from this gene was a 218-aa protein called QnrA. This protein belonging to the pentapeptide repeat family shared sequence homology with the immunity protein McbG. Previous studies suggested that McbG protects DNA gyrase from the action of various genotoxic chemicals [115].
\nBased on the mechanism of action of quinolones (the inhibition of topoisomerases I and IV) and the similarity of QnrA to McbG, Tran and Jacoby determined the ability of QnrA to induce resistance against quinolones by topoisomerase protection [115].
\nIn 2005, two independent teams managed to determine the same activity as QnrA for two other proteins identified as QnrB [116] and QnrS [117].
\nSubsequent studies of the qnrA plasmid found that this plasmid was able to promote greater resistance than expected and that is how, in 2006, Ari Robicsek et al. discovered another mechanism of action of resistance to quinolones mediated by the enzymatic action of aminoglycoside acetyltransferase, AAC(6′)-Ib-cr. They also reported that the quinolone resistance mechanism was determined by reduction of the activity of ciprofloxacin by N-acetylation at the amino nitrogen on its piperazinyl substituent [118].
\nIn 2007, three groups of researchers separately demonstrated another resistance mechanism encoded by plasmids. These works, in correlation with Martinez’s works, involve quinolone efflux pumps mediated by plasmids QepA [119, 120] and OqxAB [121].
\nIn summary, there are three mechanisms for PMQR:
The plasmid genes qnrA, qnrB, qnrC, qnrD, qnrS, and qnrVC encode proteins from the pentapeptide repeat family that protects DNA gyrase and topoisomerase IV from quinolone inhibition. The qnr genes are generally associated with mobilizing or transposable elements in plasmids and are often incorporated into sul1-type integrons.
The second mechanism mediated by plasmids involves acetylation of quinolones with an appropriate amino nitrogen target by a variant of the common aminoglycoside acetyltransferase AAC(6′)-Ib-cr.
Improved outflow produced by plasmid genes for QepAB and OqxAB pumps.
Bacterial resistance to antibiotics is a serious problem worldwide and offers the bleakest outlook and prognosis. The number of reports of isolation of multiresistant strains is increasing, including antibiotics of the latest generation or exclusive intrahospital use. In this sense, isolates of strains resistant to practically all members of the quinolone family have been reported.
\nThe implementation of appropriate practices in the use of antibiotics plays an important role in the fight against this serious global problem. The proper management of antibiotics must include limiting their use in the livestock, agricultural, and food industries; as well as the correct medical prescription, avoiding self-medication, and always seeking adherence to the full antibiotical treatment scheme.
\nThe knowledge of the molecular mechanisms associated with resistance to quinolones and other antibiotics offers us great possibilities for molecular epidemiological monitoring of the emergence of new resistant strains, as well as their distribution. This knowledge offers the pharmaceutical industry the tools for the development of new drugs. It is important to consider that the development time of new drugs is exceeded by the speed of appearance of new resistant strains.
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\\n\\nCorresponding authors will receive a 25% discount on their Open Access Publication Fees (OAPF) for Open Access book chapters. A 20% discount for publishing a long-form monographs, 25% for compacts and 23% for short-form monographs.
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