Article
Microbiology
Soyoun Park, Adam Classen, Hanny Maeva Gohou, Roberto Maldonado, Emily Kretschmann, Chloe Duvernay, Geun-Joong Kim, Jennifer Ronholm
Summary: A new plasmid-based screening method was used to identify bacteria with antagonistic activity against antibiotic-resistant Staphylococcus aureus. By creating stable recombinant plasmids carrying reporter proteins under the control of a S. aureus promoter, the study successfully identified commensal bacteria with growth-inhibiting and quorum-quenching activity. This approach offers a promising strategy for developing probiotic drugs and therapeutics for S. aureus infections in both humans and animals.
Review
Biochemistry & Molecular Biology
Michael Otto
Summary: Staphylococcus aureus is a significant pathogen responsible for numerous infections and causing high mortality rates in hospitalized patients. The emergence of antibiotic resistance, particularly methicillin-resistant S. aureus (MRSA), has prompted the exploration of alternative anti-virulence strategies. Targeting the S. aureus accessory gene regulator (Agr) quorum-sensing system, a key regulator of virulence, has been proposed as the most common anti-virulence approach. However, there is limited in vivo evidence for the efficacy of Agr inhibition, and potential concerns regarding biofilm formation and functional implications on invasive S. aureus infections.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Microbiology
Norhan H. Mahdally, Riham F. George, Mona T. Kashef, Medhat Al-Ghobashy, Fathia E. Murad, Ahmed S. Attia
Summary: The development of a compound named staquorsin as an Agr inhibitor for Staphylococcus aureus showed promising results in inhibiting virulence factors without affecting bacterial viability. In in vitro and in vivo testing, the compound effectively controlled the infection and demonstrated potential as a drug candidate against S. aureus.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Microbiology
Morgan M. Severn, Michael R. Williams, Ali Shahbandi, Zoie L. Bunch, Laurie M. Lyon, Amber Nguyen, Livia S. Zaramela, Daniel A. Todd, Karsten Zengler, Nadja B. Cech, Richard L. Gallo, Alexander R. Horswill
Summary: Human skin is home to a variety of commensal bacteria, including Staphylococcus hominis, which plays an important role in preventing Staphylococcus aureus colonization and infection. It produces multiple signaling molecules that inhibit the virulence factor regulation system of S. aureus and other related species. Synthetic versions of these molecules have shown protective effects against S. aureus-associated skin injuries in animal models.
Article
Microbiology
Jeong Eun Lee, Shinwon Lee, Sohee Park, Soon O. Lee, Sun H. Lee
Summary: This study found that dysfunctional accessory gene regulator (agr) is associated with higher mortality in invasive methicillin-resistant Staphylococcus aureus infections. However, the association between agr dysfunction and mortality in methicillin-susceptible Staphylococcus aureus bacteremia (MSSA-B) was not significant. The functionality of agr in causative organisms may impact patients' outcomes in MSSA-B with moderate severity.
MICROBIOLOGY SPECTRUM
(2021)
Article
Veterinary Sciences
Bruno Toledo-Silva, Fernando N. de Souza, Kristien Mertens, Sofie Piepers, Freddy Haesebrouck, Sarne De Vliegher
Summary: The formation of biofilms in Staphylococcus aureus strains causing subclinical mastitis in dairy cows is influenced by environmental signals and communication systems, with different staphylococci species impacting S. aureus biofilm formation and dispersion. Specifically, S. chromogenes enhances biofilm formation of an agr-positive S. aureus strain, while NAS isolates suppress biofilm dispersion of S. aureus. Additionally, the effects on biofilm formation and dispersion do not depend on the capacity of NAS to repress the agr system.
VETERINARY RESEARCH
(2021)
Article
Pharmacology & Pharmacy
Akram M. Salam, Gina Porras, Young-Saeng K. Cho, Morgan M. Brown, Caitlin J. Risener, Lewis Marquez, James T. Lyles, John Bacsa, Alexander R. Horswill, Cassandra L. Quave
Summary: MRSA, a serious global infectious disease threat, has been studied for potential treatment using an active component from European chestnut leaf extract.
FRONTIERS IN PHARMACOLOGY
(2021)
Article
Microbiology
Xinran Ren, Xuerui Guo, Chang Liu, Shisong Jing, Tiedong Wang, Li Wang, Jiyu Guan, Wu Song, Yicheng Zhao, Yan Shi
Summary: Hispidulin effectively inhibits the expression of the virulence factor alpha-hemolysin in Staphylococcus aureus without affecting bacterial growth.
MICROBIOLOGICAL RESEARCH
(2022)
Article
Microbiology
Yasmin Neves Vieira Sabino, Paul David Cotter, Hilario C. Mantovani
Summary: Bovine mastitis is a significant economic burden in the dairy industry, with Staphylococcus aureus being a prominent pathogen. Traditional antibiotic treatment has led to the emergence of antibiotic-resistant strains, necessitating the exploration of alternative therapeutic approaches focusing on virulence factors. Anti-virulence therapies can reduce the development of resistance and minimize impacts on the host commensal microbiota.
MICROBIOLOGICAL RESEARCH
(2023)
Article
Infectious Diseases
Tanjina Akter Suma, Nushrat Alam, Sheikh Zahir Raihan, Md. Al Zahid, Shankar Chandra Mandal, Fahrin Jahan Suchana, Ripa Kundu, Anwar Hossain, Md. Abdul Muhit
Summary: The association between antibiotic susceptibility and the prevalence of different efflux pump genes was investigated in clinical isolates of Staphylococcus aureus. The study found that the presence of multiple efflux pump genes may play a pivotal role in the development of multidrug resistance in S. aureus.
Article
Biochemistry & Molecular Biology
Monica Ramasamy, Aishwarya Vetrivel, Sharulatha Venugopal, Rajeswari Murugesan
Summary: By disrupting the quorum sensing network of Staphylococcus aureus, the prevention of bacterial infection is achieved. Through drug screening and molecular simulation, five potential inhibitors have been identified and preliminary evaluations have been conducted.
JOURNAL OF MOLECULAR MODELING
(2023)
Review
Infectious Diseases
Qi Peng, Xiaohua Tang, Wanyang Dong, Ning Sun, Wenchang Yuan
Summary: Bacteria can form biofilms to protect themselves and become persistent against external challenges. Staphylococcus aureus is a common pathogen in biofilm infections. Understanding the formation and regulation mechanisms of bacterial biofilms may provide insights against antibiotic resistance.
Article
Veterinary Sciences
Bruno Toledo-Silva, Fernando Nogueira de Souza, Sofie Piepers, Kristien Mertens, Freddy Haesebrouck, Sarne De Vliegher
Summary: Communication via quorum sensing between non-aureus staphylococci and Staphylococcus aureus in the bovine mammary gland is underexplored. Results showed that NAS can regulate the QS system of S. aureus, with S. chromogenes and S. simulans being more effective than S. epidermidis. NAS metabolites and supernatant had greater regulatory activity over S. aureus virulence genes than NAS cells themselves.
VETERINARY RESEARCH
(2021)
Article
Microbiology
Min Qiu, Lianjun Feng, Caijun Zhao, Siyuan Gao, Lijuan Bao, Yihong Zhao, Yunhe Fu, Xiaoyu Hu
Summary: In this study, it was found that commensal Bacillus subtilis inhibited Staphylococcus aureus colonization and alleviated S. aureus-induced mastitis by influencing biofilm formation. The antibiofilm effect of Bacillus subtilis H28 was the most significant, and its treatment showed relief in a mice model of S. aureus-induced mastitis.
FEMS MICROBIOLOGY ECOLOGY
(2022)
Article
Microbiology
J. Chase McNeil, Lauren M. M. Sommer, Jesus G. G. Vallejo, Kristina G. G. Hulten, Sheldon L. L. Kaplan
Summary: Antiseptic agents, including chlorhexidine gluconate (CHG), are commonly used in healthcare settings to reduce healthcare-associated infections. However, certain Staphylococcus aureus isolates with efflux pump genes, such as smr and qacA/B, have been found to be resistant to CHG. This study aimed to evaluate the relationship between the presence of these genes in S. aureus and the effectiveness of CHG-based disinfection. Results showed that isolates with smr and/or qacA/B had higher MIC values to CHG and exhibited reduced microbiocidal effects compared to susceptible isolates, even at high CHG concentrations.
MICROBIOLOGY SPECTRUM
(2023)
Article
Biochemistry & Molecular Biology
Murthy Vignesh, Shankar Ramakrishanan Madhan Shankar, Davoodbasha MubarakAli, Bodethala Narayanan Vedha Hari
Summary: The novel strain of Bacillus NKMV-3 isolated from rhizosphere is an effective biocontrol agent against Alternaria solani, the pathogen causing early blight disease in tomato. The strain contains antibiotic synthesis genes and lipopeptides, confirmed through gene amplification and liquid chromatography. Formulations based on this strain may offer an effective solution for controlling early blight disease in tomato and other crops.
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
(2022)
Review
Chemistry, Multidisciplinary
Swadhapriya Bhukta, Sangram Keshari Samal, Sahana Vasudevan, Hema Bhagavathi Sarveswari, Karthi Shanmugam, S. Adline Princy, Rambabu Dandela
Summary: The global threat of antimicrobial resistance calls for alternative approaches with unique mechanisms. Antimicrobial peptides are being widely explored as potential next generation antimicrobials and anti-infectives, offering advantages such as broad spectrum activity and delayed resistance development. Current research focuses on developing small peptidomimetic molecules (SPMs) for improved stability and activity.
Article
Biochemistry & Molecular Biology
Akhila Pudipeddi, Sahana Vasudevan, Karthi Shanmugam, Suma S. Mohan, Pothiappan Vairaprakash, Prasanna Neelakantan, Alex Stanley Balraj, Adline Princy Solomon
Summary: Methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-intermediate-resistant Staphylococcus aureus (VRSA) are high priority pathogens according to the WHO. This study focuses on the urgent need for new classes of anti-MRSA drugs and targets the GyrB subunit of bacterial DNA Gyrase. Through structure-based virtual screening and de novo ligand design, the most promising ligand qsl-304 was identified. In vitro experiments showed qsl-304's activity against the novobiocin resistant clinical isolate, Staphylococcus aureus sa-P2003, and its bacteriostatic nature with reduced resistance recurrence.
JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS
(2022)
Article
Pharmacology & Pharmacy
Jayasankari Senthilganesh, Lakshmi Deepak, Ramyadevi Durai, Vedha Hari B. Narayanan, Anbazhagan Veerappan, Nithyanand Paramasivam
Summary: Vulvovaginal Candidiasis (VVC) is a global issue for women of the reproductive age group. This study proposes a novel formulation that undergoes sol-to-gel transition and combines with standard antifungal drugs for VVC treatment. The formulated in-situ gel shows biofilm eradication against C. albicans and C. glabrata, and the researchers also explore the use of goat buccal mucosal membrane as an ex-vivo model for studying vaginal biofilms. The in vitro and ex vivo drug release kinetics demonstrate the effectiveness of the drug-loaded JCuSNPs formulation.
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Priya K. Dharshini, Ramya D. Devi, S. Banudevi, Vedha Hari B. Narayanan
Summary: By using spray drying technology, chitosan nanoparticles were successfully developed to enhance the solubility and bioavailability of dolutegravir (DTG). The nanoparticles showed a significant increase in C-max and improved bioavailability compared to pure DTG. This study demonstrates the potential of chitosan-based nanoparticles as carriers for oral administration of DTG in pediatric HIV patients.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Bozena Hosnedlova, Daniil Kabanov, Marta Kepinska, Vedha Hari B. Narayanan, Arli Aditya Parikesit, Carlos Fernandez, Geir Bjorklund, Hoai Viet Nguyen, Awais Farid, Jiri Sochor, Agnes Pholosi, Mojmir Baron, Milan Jakubek, Rene Kizek
Summary: Silver nanoparticles (AgNPs) synthesized using plant extracts, especially L. indica, exhibit strong antibacterial and antibiofilm effects.
Review
Microbiology
Parvathy Venkateswaran, Priya M. Lakshmanan, Sudhiksha Muthukrishnan, Hema Bhagavathi, Sahana Vasudevan, Prasanna Neelakantan, Adline P. Solomon
Summary: Enterococcus faecalis, a commensal in the human gastrointestinal tract, is a known cause of nosocomial infections. Its transition from a planktonic to a sessile state, along with the acquisition of multidrug resistance, poses challenges for treatment. Several key genes and molecular pathways, including quorum sensing, aggregation substance, surface adhesions, stress-related response, and sex pheromones, play critical roles in the sessile state. It is crucial to decode the hidden agenda of E. faecalis and understand the factors influencing biofilm formation in order to develop novel strategies to combat infections.
FUTURE MICROBIOLOGY
(2022)
Article
Plant Sciences
Rakhi Chakraborty, Swarnendu Roy, David Raj Chellappan, Vivekananda Mandal
Summary: The study demonstrates the potent antidiabetic and antihyperlipidemic properties of Litsea cubeba fruits and provides insights into the underlying mechanisms through network pharmacological analysis.
SOUTH AFRICAN JOURNAL OF BOTANY
(2022)
Article
Biotechnology & Applied Microbiology
Murthy Vignesh, ShankarRamakrishanan Madhan Shankar, Nagaraj Subramani, Bodethala Narayanan VedhaHari, Durai Ramyadevi
Summary: This research explores the efficacy of Bacillus velezensis NKMV-3 strain and its lipopeptide extract against early blight caused by Alternaria solani. Spray-dried tablets of this strain and extract were found to be stable and showed inhibitory effects against A.solani, making them suitable candidates for bio control of tomato early blight.
BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY
(2022)
Article
Food Science & Technology
Thirukkumar Subramani, Hemalatha Ganapathyswamy, Vellaikumar Sampathrajan, C. David Raj
Summary: Cottonseed milk has the potential to be a valuable plant-based milk alternative, but its consumption is limited due to gossypol toxicity. This study found that an intake of cottonseed milk affected the hematological parameters and semen characteristics of rats.
FOOD PRODUCTION PROCESSING AND NUTRITION
(2023)
Article
Biochemistry & Molecular Biology
Menon Archana, Durairajan Rubini, Krishnan Priya Dharshini, Bodethala Narayanan Vedha Hari, Senthilganesh Jayasankari, Durai Ramyadevi, Weronika Gonciarz, Agnieszka Domanska, Marek Brzezinski, Paramasivam Nithyanand
Summary: This study focuses on 3D printing a urinary catheter with anti-infective properties by incorporating the antibiotic secnidazole. The optimized catheter has dimensions of 5mm outer diameter, 3.5mm inner diameter, and 50mm length. The drug-loaded catheter showed a sustained release of secnidazole, effectively disrupting biofilms and suppressing virulence factors of urinary tract infection-causing pathogens.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Multidisciplinary Sciences
Gopalakrishnan Thamilselvan, Helma David, Anusree Sajeevan, Shobana Rajaramon, Adline Princy Solomon, Ramya Devi Durai, Vedha Hari B. Narayanan
Summary: This study explores the use of a smart hydrogel delivery system for the treatment of S. aureus-induced soft skin infections. The system combines the antibiotic Ciprofloxacin (CIP) and an efflux pump inhibitor 5-Nitro-2-(3-phenylpropoxy) pyridine (5-NPPP) to re-sensitize the pathogen towards antibiotics and reduce antimicrobial resistance. The study involves the fabrication of CIP-loaded polyvinyl alcohol (PVA) hydrogels and the development of polymeric nanoparticles for the controlled release of 5-NPPP. In vivo studies using Balb/c mice models demonstrate the effectiveness of the dual drugs loaded hydrogels in reducing bacterial load and promoting re-epithelization.
SCIENTIFIC REPORTS
(2023)
Article
Biochemistry & Molecular Biology
K. Malarvizhi, B. N. Vedha Hari, P. Rajalakshmi, S. Devaraj, Ramyadevi Durai
Summary: This study analyzes the preparation and properties of metallopharmaceuticals, providing scientific evidence for their stability and efficacy. It helps overcome the quality and safety concerns of metal-mineral constituents in the formulation.
RSC MEDICINAL CHEMISTRY
(2023)
Proceedings Paper
Materials Science, Multidisciplinary
B. N. Vedha Hari, N. Sathiya Narayanan, N. Baskar, N. Sriraman, V. S. P. Suraj Nanduru
Summary: This study integrates surface texturing and extended self-lubrication to achieve a hassle-free and toxic-free working environment for machining grey cast iron materials. The experimental results show that using semi-solid lubricant filled textured tools can reduce cutting forces and friction coefficients, particularly at higher cutting speeds. However, it was found that the texture surfaces and lubricant-filled gaps away from the cutting edge did not contribute to the cutting performance.
MATERIALS TODAY-PROCEEDINGS
(2022)
Review
Pharmacology & Pharmacy
Archana Menon, Rubini Durairajan, Ramyadevi Durai, Nithyanand Paramasivam, VedhaHari B. Narayanana
Summary: Three-dimensional printing is a pioneering technology that can be used to manufacture catheters with antimicrobial properties and alter their physical properties to ease discomfort. New technologies and materials are needed to overcome existing challenges and limitations.
CRITICAL REVIEWS IN THERAPEUTIC DRUG CARRIER SYSTEMS
(2022)