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Aelenei P, Rimbu CM, Horhogea CE, Lobiuc A, Neagu AN, Dunca SI, Motrescu I, Dimitriu G, Aprotosoaie AC, Miron A. Prenylated phenolics as promising candidates for combination antibacterial therapy: Morusin and kuwanon G. Saudi Pharm J 2020; 28:1172-1181. [PMID: 33132710 PMCID: PMC7584796 DOI: 10.1016/j.jsps.2020.08.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Accepted: 08/11/2020] [Indexed: 12/20/2022] Open
Abstract
Combination of antibiotics with natural products is a promising strategy for potentiating antibiotic activity and overcoming antibiotic resistance. The purpose of the present study was to investigate whether morusin and kuwanon G, prenylated phenolics in Morus species, have the ability to enhance antibiotic activity and reverse antibiotic resistance in Staphylococcus aureus and Staphylococcus epidermidis. Commonly used antibiotics (oxacillin, erythromycin, gentamicin, ciprofloxacin, tetracycline, clindamycin) were selected for the combination studies. Checkerboard and time-kill assays were used to investigate potential bacteriostatic and bactericidal synergistic interactions, respectively between morusin or kuwanon G and antibiotics. According to both fractional inhibitory concentration index and response surface models, twenty combinations (14 morusin-antibiotic combinations, six kuwanon G-antibiotic combinations) displaying bacteriostatic synergy were identified, with 4–512-fold reduction in the minimum inhibitory concentration values of antibiotics in combination. Both morusin and kuwanon G reversed oxacillin resistance of methicillin-resistant Staphylococcus aureus. In addition, morusin reversed tetracycline resistance of Staphylococcus epidermidis. At half of the minimum inhibitory concentrations, combinations of morusin with oxacillin or gentamicin showed bactericidal synergy against methicillin-resistant Staphylococcus aureus. Fluorescence and differential interference contrast microscopy and scanning electron microscopy showed an increase in the membrane permeability and massive leakage of cellular content in methicillin-resistant Staphylococcus aureus exposed to morusin or kuwanon G. Overall, our findings strongly indicate that both prenylated compounds are good candidates for the development of novel antibacterial combination therapies.
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Affiliation(s)
- Petruta Aelenei
- Department of Pharmacognosy, Faculty of Pharmacy, Grigore T. Popa University of Medicine and Pharmacy Iasi, Universitatii Str. 16, Iasi 700115, Romania.,Regulatory Affairs Department, Fiterman Pharma LLC, Pacurari Road 127, Iasi 700544, Romania
| | - Cristina Mihaela Rimbu
- Department of Public Health, Faculty of Veterinary Medicine, Ion Ionescu de la Brad University of Agricultural Sciences and Veterinary Medicine of Iasi, Mihail Sadoveanu Al. 8, Iasi 700489, Romania
| | - Cristina Elena Horhogea
- Department of Public Health, Faculty of Veterinary Medicine, Ion Ionescu de la Brad University of Agricultural Sciences and Veterinary Medicine of Iasi, Mihail Sadoveanu Al. 8, Iasi 700489, Romania
| | - Andrei Lobiuc
- Human Health and Development Department, Stefan cel Mare University of Suceava, Universitatii Str. 13, Suceava 720229, Romania.,Integrated Research Centre for Environmental Studies in the N-E Area - CERNESIM, L2 Laboratory, Alexandru Ioan Cuza University of Iasi, Carol I Bd. 20A, Iasi 700506, Romania
| | - Anca-Narcisa Neagu
- Faculty of Biology, Alexandru Ioan Cuza University of Iasi, Carol I Bd. 20A, Iasi 700505, Romania
| | - Simona Isabela Dunca
- Faculty of Biology, Alexandru Ioan Cuza University of Iasi, Carol I Bd. 20A, Iasi 700505, Romania
| | - Iuliana Motrescu
- Science Department & Research Institute for Agriculture and Environment, Ion Ionescu de la Brad University of Agricultural Sciences and Veterinary Medicine of Iasi, Mihail Sadoveanu Al. 3, Iasi 700490, Romania
| | - Gabriel Dimitriu
- Department of Medical Informatics and Biostatistics, Faculty of Medicine, Grigore T. Popa University of Medicine and Pharmacy Iasi, Universitatii Str. 16, Iasi 700115, Romania
| | - Ana Clara Aprotosoaie
- Department of Pharmacognosy, Faculty of Pharmacy, Grigore T. Popa University of Medicine and Pharmacy Iasi, Universitatii Str. 16, Iasi 700115, Romania
| | - Anca Miron
- Department of Pharmacognosy, Faculty of Pharmacy, Grigore T. Popa University of Medicine and Pharmacy Iasi, Universitatii Str. 16, Iasi 700115, Romania
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Liu T, Luo J, Bi G, Du Z, Kong J, Chen Y. Antibacterial synergy between linezolid and baicalein against methicillin-resistant Staphylococcus aureus biofilm in vivo. Microb Pathog 2020; 147:104411. [PMID: 32745664 DOI: 10.1016/j.micpath.2020.104411] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Revised: 06/09/2020] [Accepted: 07/18/2020] [Indexed: 10/23/2022]
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) can form biofilms, which prevents the penetration of antibiotics, decreasing their efficacy. This study investigated whether baicalein has synergistic antibacterial effects with linezolid in vivo. We cultivated MRSA 17546 biofilms on silicone implants and inserted them into the air pouches of rat models. The rats were treated with linezolid, baicalein, or a combination therapy for three consecutive days. All treatments reduced the number of colony-forming units (CFU) in the biofilms compared to the control (p < 0.05). However, by day two, the CFU counts were significantly lower in the combination group than in the individual treatment groups (p < 0.05). Histological analysis of the air pouches showed that the severity of the inflammatory cell infiltration was severe in the combination therapy group. In the combination group, the biofilm structure on the implant's surface was sparse and more free colonies could be seen by scanning electron microscopy (SEM); by day three, no obvious biofilm was observed. The serum levels of Staphylococcus enterotoxin A (SEA), C-reactive protein (CRP), and procalcitonin (PCT) were the lowest in the group where rats were treated with the combination of baicalein and linezolid (p < 0.05) compared to other groups. The results suggest that baicalein may inhibit the accessory gene regulator system, reducing the expression of SEA, thus lowering CRP and PCT levels. Furthermore, the inhibitory effect was more pronounced when baicalein was combined with linezolid. These results provide an important basis for the development of a new combination regimen to treat patients with biofilm-associated MRSA infections.
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Affiliation(s)
- Tangjuan Liu
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Guangxi Medical University, Guangxi Medical University, Nanning, China
| | - Jing Luo
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Guangxi Medical University, Guangxi Medical University, Nanning, China
| | - Guan Bi
- Department of Intensive Care Unit, The Second Affiliated Hospital of Guangxi Medical University, Guangxi Medical University, Nanning, China
| | - Zhongye Du
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Guangxi Medical University, Guangxi Medical University, Nanning, China
| | - Jinliang Kong
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Guangxi Medical University, Guangxi Medical University, Nanning, China.
| | - Yiqiang Chen
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Guangxi Medical University, Guangxi Medical University, Nanning, China.
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Ayari S, Shankar S, Follett P, Hossain F, Lacroix M. Potential synergistic antimicrobial efficiency of binary combinations of essential oils against Bacillus cereus and Paenibacillus amylolyticus-Part A. Microb Pathog 2020; 141:104008. [PMID: 31991163 DOI: 10.1016/j.micpath.2020.104008] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 01/23/2020] [Accepted: 01/24/2020] [Indexed: 10/25/2022]
Abstract
The checkerboard method was used to study the potential interactions between eight essential oils (Basil, Cinnamon, Eucalyptus, Mandarin, Oregano, Peppermint, Tea tree, and Thyme) when used as antibacterial agents against Bacillus cereus LSPQ 2872 and Paenibacillus amylolyticus ATCC 9995. The minimum inhibitory concentration (MIC) of each essential oil (EO) and the fractional inhibitory concentration (FIC) index for the binary combinations of essential oils (EOs) were determined. According to FIC index values, some of the compound binary combinations showed an additive effect; however, Thyme/Tea tree and Cinnamon/Thyme EOs exhibited a synergistic effect against P. amylolyticus and B. cereus, respectively. Cinnamon/Thyme EOs mixture exhibited no interactive effect against P. amylolyticus, but a synergistic effect against B. cereus. The combination of Oregano/Thyme EOs displayed the best antibacterial activity and showed a synergistic effect against B. cereus and P. amylolyticus bacteria. The Oregano/Thyme EOs mixture has potential application in food preservation to reduce the contamination of B. cereus and P. amylolyticus.
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Affiliation(s)
- Samia Ayari
- Research Laboratory in Sciences, Applied to Food, INRS Armand-Frappier Health and Biotechnology Centre, Canadian Irradiation Centre, Institute of Nutrition and Functional Foods (INAF), 531 Boulevard des Prairies, Laval, Quebec, Canada, H7V 1B7; National Center for Nuclear Sciences and Technologies (CNSTN), Tunis Cedex, 2020, Tunisia; National Institute for Applied Sciences and Technology (INSAT), B.P. 676, Tunis Cedex, 1080, Tunisia
| | - Shiv Shankar
- Research Laboratory in Sciences, Applied to Food, INRS Armand-Frappier Health and Biotechnology Centre, Canadian Irradiation Centre, Institute of Nutrition and Functional Foods (INAF), 531 Boulevard des Prairies, Laval, Quebec, Canada, H7V 1B7
| | - Peter Follett
- United States Department of Agriculture, Agricultural Research Service, U.S. Pacific Basin Agricultural Research Center, 64 Nowelo Street, Hilo, HI, 96720, USA.
| | - Farah Hossain
- Research Laboratory in Sciences, Applied to Food, INRS Armand-Frappier Health and Biotechnology Centre, Canadian Irradiation Centre, Institute of Nutrition and Functional Foods (INAF), 531 Boulevard des Prairies, Laval, Quebec, Canada, H7V 1B7
| | - Monique Lacroix
- Research Laboratory in Sciences, Applied to Food, INRS Armand-Frappier Health and Biotechnology Centre, Canadian Irradiation Centre, Institute of Nutrition and Functional Foods (INAF), 531 Boulevard des Prairies, Laval, Quebec, Canada, H7V 1B7.
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Kali A, Bhuvaneshwar D, Charles PMV, Seetha KS. Antibacterial synergy of curcumin with antibiotics against biofilm producing clinical bacterial isolates. J Basic Clin Pharm 2016; 7:93-6. [PMID: 27330262 PMCID: PMC4910474 DOI: 10.4103/0976-0105.183265] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
INTRODUCTION The role of natural bioactive substances in treating infections has been rediscovered as bacterial resistance become common to most of the antibiotics. Curcumin is a bioactive substance from turmeric. Owing to antimicrobial properties, its prospect as an antibacterial agent is currently under focus. MATERIALS AND METHODS We have evaluated the in vitro synergy of curcumin with antibiotics against sixty biofilm producing bacterial isolates. Congo red agar method was used to identify the biofilm producing isolates. Curcumin minimum inhibitory concentration (MIC) was determined by agar dilution method. Its antibiotic synergy was identified by the increase in disc diffusion zone size on Mueller-Hinton agar with 32 mg/L curcumin. RESULTS The mean MICs of curcumin against Gram-positive and Gram-negative isolates were 126.9 mg/L and 117.4 mg/L, respectively. Maximum synergy was observed with ciprofloxacin among Gram-positive and amikacin, gentamicin, and cefepime among Gram-negative isolates. CONCLUSIONS Curcumin per se as well as in combination with other antibiotics has a demonstrable antibacterial action against biofilm producing bacterial isolates. It may have a beneficial role in supplementing antibiotic therapy.
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Affiliation(s)
- Arunava Kali
- Department of Microbiology, Mahatma Gandhi Medical College and Research Institute, Puducherry, India
| | - Devaraj Bhuvaneshwar
- Department of Microbiology, Mahatma Gandhi Medical College and Research Institute, Puducherry, India
| | - Pravin M V Charles
- Department of Microbiology, Mahatma Gandhi Medical College and Research Institute, Puducherry, India
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