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Liposomes and antibiotics

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https://www.readbyqxmd.com/read/29472905/1-2-4-dichlorophenethyl-amino-3-phenoxypropan-2-ol-kills-pseudomonas-aeruginosa-through-extensive-membrane-damage
#1
Valerie Defraine, Veerle Liebens, Evelien Loos, Toon Swings, Bram Weytjens, Carolina Fierro, Kathleen Marchal, Liam Sharkey, Alex J O'Neill, Romu Corbau, Arnaud Marchand, Patrick Chaltin, Maarten Fauvart, Jan Michiels
The ever increasing multidrug-resistance of clinically important pathogens and the lack of novel antibiotics have resulted in a true antibiotic crisis where many antibiotics are no longer effective. Further complicating the treatment of bacterial infections are antibiotic-tolerant persister cells. Besides being responsible for the recalcitrant nature of chronic infections, persister cells greatly contribute to the observed antibiotic tolerance in biofilms and even facilitate the emergence of antibiotic resistance...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29460722/cutaneous-toxicity-in-a-laboratory-beagle-canis-lupus-familiaris-after-chronic-administration-of-doxorubicin-hydrochloride
#2
Kathryn A Guerriero, Steven R Wilson, Nabil E Boutagy, Chi Liu, Albert J Sinusas, Caroline J Zeiss
An adult female beagle (Canis lupus familiaris) used in a model of doxorubicin-induced cardiomyopathy presented with epithelial desquamation on the shoulders and ventrum after receiving the 8th weekly intravenous dose of the free form of doxorubicin (20 mg/m2; total accumulation, 160 mg/m2). The lesions were empirically treated with topical disinfectants and topical and systemic antibiotics. Despite treatment, the lesions progressed and ulcerated. Bacterial culture revealed Staphylococcus aureus, but trichogram, skin scraping, and fungal culture were negative for microorganisms...
February 1, 2018: Comparative Medicine
https://www.readbyqxmd.com/read/29430821/alanine-and-lysine-scans-of-the-ll-37-derived-peptide-fragment-kr-12-reveal-key-residues-for-antimicrobial-activity
#3
Sunithi Gunasekera, Taj Muhammad, Adam A Strömstedt, K Johan Rosengren, Ulf Göransson
The human host defence peptide LL-37 is a broad-spectrum antibiotic with immunomodulatory functions. Residues 18-29 in LL-37 have previously been identified as a minimal peptide (KR-12) that retains antibacterial activity with decreased cytotoxicity. In this study, we generated analogues of KR-12 by Ala and Lys scans to identify key elements for activity. These were tested against a panel of human pathogens and for membrane permeabilization on liposomes. Replacements of hydrophobic and cationic residues with Ala were detrimental for antibiotic potency...
February 11, 2018: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/29391780/diminishing-the-side-effect-of-mitomycin-c-by-using-ph-sensitive-liposomes-in-vitro-characterization-and-in-vivo-pharmacokinetics
#4
Yi-Ping Fang, Pei-Yu Hu, Yaw-Bin Huang
Introduction: Mitomycin C is an anticancer antibiotic agent that has the potential for broad-spectrum use against several cancers, including mammary cancers. Because its half-life is 17 min after a 30 mg intravenous bolus administration, the suitability of mitomycin C for wide use in the clinical setting is limited. Based on tumor pathophysiology, pH-sensitive liposomes could provide better tumor-targeted effects. The aim of this study was to investigate the possibility of diminishing the side effect of mitomycin C by using pH-sensitive liposomes...
2018: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/29348524/linearmycins-are-lytic-membrane-targeting-antibiotics
#5
Reed M Stubbendieck, Dakota J Brock, Jean-Philippe Pellois, Jason J Gill, Paul D Straight
The linearmycin family of polyketides was originally classified as antifungal metabolites. However, in addition to antifungal activity, we previously found that linearmycins cause cellular lysis and colony degradation of the Gram-positive bacterium Bacillus subtilis. We recently showed that Streptomyces sp. strain Mg1 incorporates linearmycins into extracellular vesicles, which are capable of lysing B. subtilis. However, the mechanism of linearmycin-induced lysis was hitherto unexplored. Therefore, we sought to determine how linearmycin-laden vesicles cause lysis...
January 18, 2018: Journal of Antibiotics
https://www.readbyqxmd.com/read/29339382/in-vitro-susceptibility-of-neisseria-gonorrhoeae-strains-to-mupirocin-an-antibiotic-reformulated-to-parenteral-nano-liposomal-antibiotic
#6
Ahuva Cern, Kristie L Connolly, Ann E Jerse, Yechezkel Barenholz
Neisseria gonorrhoeae is an urgent antibiotic-resistant threat. This study determined the minimum inhibitory concentrations (MIC) of mupirocin to be 0.0039-0.0625 μg/ml for 94 N. gonorrhoeae strains Cross-resistance with other antibiotics was not detected.Mupirocin, currently limited to topical administration, demonstrated activity by injection when delivered in nano-liposomes. The nano-liposomal formulation of mupirocin is a potential treatment for drug-resistant N. gonorrhoeae.
January 16, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29323910/direct-synthesis-of-prussian-blue-nanoparticles-in-liposomes-incorporating-natural-ion-channels-for-cs-adsorption-and-particle-size-control
#7
Tomomi Koshiyama, Motoki Tanaka, Masayuki Honjo, Yumi Fukunaga, Tomoya Okamura, Masaaki Ohba
Coordination polymer (CP) nanoparticles (NPs) formed by a self-assembly of organic ligands and metal ions are one of the attractive materials for molecular capture and deliver/release in aqueous media. Control of particle size and prevention of aggregation among CP NPs are important factors for improving their adsorption capability in water. We demonstrate here the potential of a liposome incorporating an antibiotic ion channel as a vessel for synthesizing Prussian blue (PB) NPs, being a typical CP. In the formation of PB NPs within liposomes, the influx rate of Fe2+ ions into liposome encapsulated [Fe(CN)6]3- through channels was fundamental for the change of NPs' sizes...
January 11, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29311198/fungal-peritonitis-caused-by-rhodotorula-mucilaginosa-in-a-capd-patient-treated-with-liposomal-amphotericin-b-a-case-report-and-literature-review
#8
Frédéric Franconieri, Julie Bonhomme, Aline Doriot, Cécile Bonnamy, Maxence Ficheux, Thierry Lobbedez, Clémence Béchade
Rhodotorula mucilaginosa is a ubiquitous yeast that may cause serious peritoneal dialysis (PD) infections. A 70-year-old man receiving continuous ambulatory peritoneal dialysis (CAPD) for 6 months presented with a PD infection caused by Rhodotorula mucilaginosa The patient was treated with intravenous liposomal amphotericin B. His peritoneal catheter was simultaneously removed and reinserted. To date, only 10 cases of Rhodotorula CAPD infections have been reported. Catheters, corticoids, cancer, and previous antibiotic therapy were the main risk factors for these infections...
January 2018: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
https://www.readbyqxmd.com/read/29305156/novel-lipids-with-three-c18-fatty-acid-chains-and-an-amino-acid-head-group-for-ph-responsive-and-sustained-antibiotic-delivery
#9
Mahantesh Jadhav, Rahul S Kalhapure, Sanjeev Rambharose, Chunderika Mocktar, Sanil Singh, Tetsuya Kodama, Thirumala Govender
The acidic environment at bacterial infection sites is a potential external stimulus for targeted antibiotic delivery. This paper reports new biocompatible pH-sensitive lipids (PSLs) with three hydrocarbon tails, and a head group with a secondary amine and carboxylate function for site-specific nano delivery of vancomycin (VCM). PSLs formed stable liposomes with mean vesicle diameters and polydispersity indices between 99.38 ± 6.59 nm to 105.60 ± 5.38 nm and 0.161 ± 0.003 to 0.219 ± 0...
January 2, 2018: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/29278945/elastin-like-polypeptide-incorporated-thermally-sensitive-liposome-improve-antibiotic-therapy-against-staphyloccous-aureus-in-vitro
#10
Adane S Nigatu, Harshini Ashar, Sri Nandhini Sethuraman, Rachel Wardlow, Danny Maples, Jerry Malayer, Ashish Ranjan
Musculoskeletal infections caused by bacteria such as Staphylococcus aureus and Pseudomonas aeruginosa in children and adults can lead to adverse outcomes including a need for extensive surgical debridement and limb amputation. To enable targeted antimicrobial release in infected tissues, the objective of this study was to design and investigate novel Elastin-Like Polypeptide (ELP) based thermally-sensitive liposomes in vitro. ELP biopolymers can change their phase behavior at higher temperatures. We hypothesized that ELP-TSL will improve therapeutic efficacy by releasing antimicrobial payloads locally at higher temperatures (≥39°C)...
December 26, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/29249044/endogenous-fusarium-endophthalmitis-during-treatment-for-acute-myeloid-leukemia-successfully-treated-with-25-gauge-vitrectomy-and-antifungal-medications
#11
Masaaki Yoshida, Naoki Kiyota, Kazuichi Maruyama, Hiroshi Kunikata, Masahiro Toyokawa, Shigehiro Hagiwara, Koichi Makimura, Naomi Sato, Shinji Taniuchi, Toru Nakazawa
Endogenous fungal endophthalmitis (EFE) caused by disseminated fusariosis is a rare condition that generally has a poor outcome, even with intensive therapy. Here, we describe a case in which this type of EFE was diagnosed with vitreous sampling and was successfully treated with 25-gauge vitrectomy and antifungals, including liposomal amphotericin B and voriconazole. A 16-year-old male patient undergoing treatment for acute myeloid leukemia complained of eye pain and blurred vision in his right eye. Treatment was initiated for a vitreous opacity, possibly associated with herpetic retinitis, but the patient worsened and he was referred to us...
December 16, 2017: Mycopathologia
https://www.readbyqxmd.com/read/29248479/nanomaterials-and-molecular-transporters-to-overcome-the-bacterial-envelope-barrier-towards-advanced-delivery-of-antibiotics
#12
Rita S Santos, Céu Figueiredo, Nuno F Azevedo, Kevin Braeckmans, Stefaan C De Smedt
With the dramatic consequences of bacterial resistance to antibiotics, nanomaterials and molecular transporters have started to be investigated as alternative antibacterials or anti-infective carrier systems to improve the internalization of bactericidal drugs. However, the capability of nanomaterials/molecular transporters to overcome the bacterial cell envelope is poorly understood. It is critical to consider the sophisticated architecture of bacterial envelopes and reflect how nanomaterials/molecular transporters can interact with these envelopes, being the major aim of this review...
December 14, 2017: Advanced Drug Delivery Reviews
https://www.readbyqxmd.com/read/29179607/novel-pyochelin-based-pegylated-liposomes-for-enhanced-delivery-of-antibiotics-against-resistant-clinical-isolates-of-pseudomonas-aeruginosa
#13
Pradeep Pushparaj Selvadoss, Jayshree Nellore, Malathy Balaraman Ravindrran, Uma Sekar
Pseudomonas aeruginosa is a problematic human pathogen resistant to almost all available antibiotics. The important prerequisite for these drugs to target this bacterium is an efficient delivery system. Siderophore-mediated drug delivery system is a promising approach to carry out antibiotics to the cells. Pyochelin, a siderophore of P. aeruginosa, was successfully synthesized in a five-step procedure. PEGylated liposomal pyochelin-antibiotic (L-Pch-Ab) carrier was fabricated by thin-film hydration method. L-Pch-Ab had an average size of 90...
November 27, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29157962/current-and-novel-approaches-for-control-of-dental-biofilm
#14
REVIEW
Trinette Fernandes, Chintan Bhavsar, Sujata Sawarkar, Anisha D'souza
Insights in oral demographics have revealed that a significant percentage of population faces chronic incidences of oral diseases. The innervation of these oral manifestations is required because untreated conditions may lead to bone loss in the oral cavity and systemic complications. Conventional treatments include surgery of the affected area followed by its management and/or treatment with antibiotics. However, widely used antibiotics like Triclosan have serious side effects including down-regulation of oral keratinocytes and fibroblasts...
November 17, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29125646/epidural-abscess-caused-by-schizophyllum-commune-a-rare-case-of-rhinogenic-cranial-complication-by-a-filamentous-basidiomycete
#15
Kazuya Tone, Ryuichi Fujisaki, Shigehiro Hagiwara, Takashi Tamura, Shinobu Ishigaki, Mohamed Mahdi Alshahni, Makoto Takehisa, Takehiro Watanabe, Takuya Yasui, Takuo Tokairin, Toshiyo Sagawa, Tetsuya Sakamoto, Ken Ito, Kazuyoshi Kuwano, Koichi Makimura
Central nervous system (CNS) infections due to filamentous basidiomycetes are extremely rare. We encountered a case of epidural abscess due to Schizophyllum commune that extended from sinusitis. A 53-year-old Japanese man presented at our hospital with a headache. Computed tomography (CT) of the cranium and sinuses showed ethmoid and sphenoid sinusitis with no intracranial abnormalities. The patient was diagnosed with acute sinusitis and underwent antibiotic treatment. However, the symptoms deteriorated, and the patient came to our hospital again with consciousness disturbance...
November 10, 2017: Mycoses
https://www.readbyqxmd.com/read/29123908/a-case-of-disseminated-cryptococcosis-with-necrotizing-fasciitis-in-a-non-hiv-patient
#16
Tetsuya Hoshino, Kazuya Omura, Shinichi Kimura, Hiroyuki Takahashi, Katsuhiko Kamei, Misako Ohkusu
Case: Disseminated cryptococcosis is a well-recognized condition among HIV patients, but it also occurs in non-HIV patients. Necrotizing fasciitis caused by cryptococcus is rare. An 81-year-old man who had received steroid therapy presented with erythema and pain in his right thigh. After the rapid progression of symptoms and a failure to respond to antibiotic therapy, a clinical diagnosis of necrotizing fasciitis was made. We performed debridement, and yeasts were detected using a Gram stain of the fascia...
October 2017: Acute Medicine & Surgery
https://www.readbyqxmd.com/read/29077527/the-rationale-and-evidence-for-use-of-inhaled-antibiotics-to-control-pseudomonas-aeruginosa-infection-in-non-cystic-fibrosis-bronchiectasis
#17
Rajiv Dhand
Non-cystic fibrosis bronchiectasis (NCFBE) is a chronic inflammatory lung disease characterized by irreversible dilation of the bronchi, symptoms of persistent cough and expectoration, and recurrent infective exacerbations. The prevalence of NCFBE is on the increase in the United States and Europe, but no licensed therapies are currently available for its treatment. Although there are many similarities between NCFBE and cystic fibrosis (CF) in terms of respiratory symptoms, airway microbiology, and disease progression, there are key differences, for example, in response to treatment, suggesting differences in pathogenesis...
October 27, 2017: Journal of Aerosol Medicine and Pulmonary Drug Delivery
https://www.readbyqxmd.com/read/29075113/efficacy-of-neutral-and-negatively-charged-liposome-loaded-gentamicin-on-planktonic-bacteria-and-biofilm-communities
#18
Moayad Alhariri, Majed A Majrashi, Ali H Bahkali, Faisal S Almajed, Ali O Azghani, Mohammad A Khiyami, Essam J Alyamani, Sameera M Aljohani, Majed A Halwani
We investigated the efficacy of liposomal gentamicin formulations of different surface charges against Pseudomonas aeruginosa and Klebsiella oxytoca. The liposomal gentamicin formulations were prepared by the dehydration-rehydration method, and their sizes and zeta potential were measured. Gentamicin encapsulation efficiency inside the liposomal formulations was determined by microbiologic assay, and stability of the formulations in biologic fluid was evaluated for a period of 48 h. The minimum inhibitory concentration and the minimum bactericidal concentration were determined, and the in vitro time kill studies of the free form of gentamicin and liposomal gentamicin formulations were performed...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29057672/chemical-meningitis-related-to-intra-csf-liposomal-cytarabine
#19
B Durand, F Zairi, T Boulanger, J Bonneterre, L Mortier, Emilie Le Rhun
Therapeutic options of leptomeningeal metastases include intra-cerebrospinal fluid (CSF) chemotherapy. Among intra-CSF agents, liposomal cytarabine has advantages but can induce specific toxicities. A BRAF-V600E-mutated melanoma leptomeningeal metastases patient, treated by dabrafenib and liposomal cytarabine, presented after the first injection of liposomal cytarabine with hyperthermia and headaches. Despite sterile CSF/blood analyses, extended intravenous antibiotics were given and the second injection was delayed...
October 23, 2017: CNS Oncology
https://www.readbyqxmd.com/read/28989281/efficacy-and-tolerability-of-liposomal-polyvinylpyrrolidone-iodine-hydrogel-for-the-localized-treatment-of-chronic-infective-inflammatory-dermatoses-an-uncontrolled-pilot-study
#20
Matthias Augustin, Lisa Goepel, Arnd Jacobi, Bjoern Bosse, Stefan Mueller, Michael Hopp
Infection is common in many chronic, inflammatory skin conditions but is often difficult to treat, in part due to growing bacterial resistance to antibiotics. Liposomal polyvinyl-pyrrolidone (PVP)-iodine hydrogel has a unique mode of action, combining the antiseptic and anti-inflammatory actions of PVP-iodine with the drug delivery and moisturizing properties of liposomes. We investigated the utility of liposomal PVP-iodine to treat infective dermatoses. In this prospective, single-arm (uncontrolled), open-label Phase II pilot study, patients with acne vulgaris (n=30), atopic dermatitis (n=20), impetigo contagiosa (n=10), and rosacea (n=10) received PVP-iodine (3%) hydrogel for ≤4 weeks...
2017: Clinical, Cosmetic and Investigational Dermatology
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