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Abstract Title:

The effect of N-acetylcysteine on biofilms: Implications for the treatment of respiratory tract infections.

Abstract Source:

Respir Med. 2016 08 ;117:190-7. Epub 2016 Jun 16. PMID: 27492531

Abstract Author(s):

Francesco Blasi, Clive Page, Gian Maria Rossolini, Lucia Pallecchi, Maria Gabriella Matera, Paola Rogliani, Mario Cazzola

Article Affiliation:

Francesco Blasi

Abstract:

OBJECTIVES: In airway infections, biofilm formation has been demonstrated to be responsible for both acute and chronic events, and constitutes a genuine challenge in clinical practice. Difficulty in eradicating biofilms with systemic antibiotics has led clinicians to consider the possible role of non-antibiotic therapy. The aim of this review is to examine current evidence for the use of N-acetylcysteine (NAC) in the treatment of biofilm-related respiratory infections.

METHODS: Electronic searches of PUBMED up to September 2015 were conducted, searching for 'biofilm', 'respiratory tract infection', 'N-acetylcysteine', 'cystic fibrosis', 'COPD', 'bronchiectasis', 'otitis', and 'bronchitis' in titles and abstracts. Studies included for review were primarily in English, but a few in Italian were also selected.

RESULTS: Biofilm formation may be involved in many infections, including ventilator-associated pneumonia, cystic fibrosis, bronchiectasis, bronchitis, and upper respiratory airway infections. Many in vitro studies have demonstrated that NAC is effective in inhibiting biofilm formation, disrupting preformed biofilms (both initial and mature), and reducing bacterial viability in biofilms. There are fewer clinical studies on the use of NAC in disruption of biofilm formation, although there is some evidence that NAC alone or in combination with antibiotics can decrease the risk of exacerbations of chronic bronchitis, chronic obstructive pulmonary disease, and rhinosinusitis. However, the usefulness of NAC in the treatment of cystic fibrosis and bronchiectasis is still matter of debate. Mostof the studies published to date have used oral or intramuscular NAC formulations.

CONCLUSIONS: Evidence from in vitro studies indicates that NAC has good antibacterial properties and the ability to interfere with biofilm formation and disrupt biofilms. Results from clinical studies have provided some encouraging findings that need to be confirmed and expanded using other routes of administration of NAC suchas inhalation.

Study Type : Review

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Sayer Ji
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