Abstract
Purpose: Persistence of skin and wound infections is nowadays accepted being linked to bacterial biofilms, which are highly recalcitrant to treatments and contribute to maintain a constant inflammation state and prevent a correct healing. Topical antimicrobials are the most common first-line self-medications; however, treatment failure is not uncommon and emerging resistance to antibiotics is alarming. Chlorquinaldol is an antimicrobial with a wide spectrum of activity and desirable characteristics for topical application. Aim of this study was to evaluate the efficacy of chlorquinaldol to prevent or eradicate S. aureus and P. aeruginosa biofilms, in comparison to classic topical antibiotics like gentamicin and fusidic acid. Methods: Minimum inhibitory concentrations (MIC) were assessed for each strain and subinhibitory concentrations (½ and ¼ MIC) were used in the biofilm assay. Antimicrobial assays were performed during biofilm formation or were applied on mature biofilms and were evaluated by means of crystal violet assay and confocal laser scan microscopy. Results: Chlorquinaldol and gentamicin were the most effective antimicrobials in both eradicating and preventing pathogens biofilm; however, resistance to methicillin and impermeability to carbapenems impaired chlorquinaldol effect. In addition, similarly to other hydroxyquinolines, aspecific metal chelation is here proposed as chlorquinaldol mode of action. Conclusion: Relying on an acceptable antibiofilm and a wide spectrum of activity, an aspecific mode of action and consequent absence of resistance development, chlorquinaldol proved to be a good antimicrobial for topical use.
| Original language | English |
|---|---|
| Pages (from-to) | 2177-2189 |
| Number of pages | 13 |
| Journal | Infection and Drug Resistance |
| Volume | 12 |
| DOIs | |
| Publication status | Published - 2019 |
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Keywords
- Biofilm
- Chlorquinaldol
- Pseudomonas aeruginosa
- Skin and wound tissue infection
- Staphylococcus aureus
ASJC Scopus subject areas
- Pharmacology
- Infectious Diseases
- Pharmacology (medical)
Cite this
Chlorquinaldol, a topical agent for skin and wound infections : Anti-biofilm activity and biofilm-related antimicrobial cross-resistance. / Bidossi, Alessandro; Bottagisio, Marta; De Grandi, Roberta; Drago, Lorenzo; De Vecchi, Elena.
In: Infection and Drug Resistance, Vol. 12, 2019, p. 2177-2189.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Chlorquinaldol, a topical agent for skin and wound infections
T2 - Anti-biofilm activity and biofilm-related antimicrobial cross-resistance
AU - Bidossi, Alessandro
AU - Bottagisio, Marta
AU - De Grandi, Roberta
AU - Drago, Lorenzo
AU - De Vecchi, Elena
PY - 2019
Y1 - 2019
N2 - Purpose: Persistence of skin and wound infections is nowadays accepted being linked to bacterial biofilms, which are highly recalcitrant to treatments and contribute to maintain a constant inflammation state and prevent a correct healing. Topical antimicrobials are the most common first-line self-medications; however, treatment failure is not uncommon and emerging resistance to antibiotics is alarming. Chlorquinaldol is an antimicrobial with a wide spectrum of activity and desirable characteristics for topical application. Aim of this study was to evaluate the efficacy of chlorquinaldol to prevent or eradicate S. aureus and P. aeruginosa biofilms, in comparison to classic topical antibiotics like gentamicin and fusidic acid. Methods: Minimum inhibitory concentrations (MIC) were assessed for each strain and subinhibitory concentrations (½ and ¼ MIC) were used in the biofilm assay. Antimicrobial assays were performed during biofilm formation or were applied on mature biofilms and were evaluated by means of crystal violet assay and confocal laser scan microscopy. Results: Chlorquinaldol and gentamicin were the most effective antimicrobials in both eradicating and preventing pathogens biofilm; however, resistance to methicillin and impermeability to carbapenems impaired chlorquinaldol effect. In addition, similarly to other hydroxyquinolines, aspecific metal chelation is here proposed as chlorquinaldol mode of action. Conclusion: Relying on an acceptable antibiofilm and a wide spectrum of activity, an aspecific mode of action and consequent absence of resistance development, chlorquinaldol proved to be a good antimicrobial for topical use.
AB - Purpose: Persistence of skin and wound infections is nowadays accepted being linked to bacterial biofilms, which are highly recalcitrant to treatments and contribute to maintain a constant inflammation state and prevent a correct healing. Topical antimicrobials are the most common first-line self-medications; however, treatment failure is not uncommon and emerging resistance to antibiotics is alarming. Chlorquinaldol is an antimicrobial with a wide spectrum of activity and desirable characteristics for topical application. Aim of this study was to evaluate the efficacy of chlorquinaldol to prevent or eradicate S. aureus and P. aeruginosa biofilms, in comparison to classic topical antibiotics like gentamicin and fusidic acid. Methods: Minimum inhibitory concentrations (MIC) were assessed for each strain and subinhibitory concentrations (½ and ¼ MIC) were used in the biofilm assay. Antimicrobial assays were performed during biofilm formation or were applied on mature biofilms and were evaluated by means of crystal violet assay and confocal laser scan microscopy. Results: Chlorquinaldol and gentamicin were the most effective antimicrobials in both eradicating and preventing pathogens biofilm; however, resistance to methicillin and impermeability to carbapenems impaired chlorquinaldol effect. In addition, similarly to other hydroxyquinolines, aspecific metal chelation is here proposed as chlorquinaldol mode of action. Conclusion: Relying on an acceptable antibiofilm and a wide spectrum of activity, an aspecific mode of action and consequent absence of resistance development, chlorquinaldol proved to be a good antimicrobial for topical use.
KW - Biofilm
KW - Chlorquinaldol
KW - Pseudomonas aeruginosa
KW - Skin and wound tissue infection
KW - Staphylococcus aureus
UR - http://www.scopus.com/inward/record.url?scp=85070090311&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85070090311&partnerID=8YFLogxK
U2 - 10.2147/IDR.S211007
DO - 10.2147/IDR.S211007
M3 - Article
AN - SCOPUS:85070090311
VL - 12
SP - 2177
EP - 2189
JO - Infection and Drug Resistance
JF - Infection and Drug Resistance
SN - 1178-6973
ER -