Proteus mirabilis: Insights into biofilm formation, virulence mechanisms, and novel therapeutic strategies Meeky Anthony Lyngdoh Kynshi, Emidahun Kharkamni, Vedant Vikrom Borah Microbe Netherlands, 2025 Proteus mirabilis , a gram-negative bacterium, is a significant cause of catheter-associated urinary tract infections, bacteremia, and other serious health complications. Its pathogenicity is driven by several virulence factors, including swarming motility, urease production, fimbriae, hemolysins, and the ability to form biofilms. These features enable the bacterium to colonize host tissues, evade immune responses, and resist antimicrobial treatments. For instance, urease increases urine alkalinity, promoting the formation of crystalline biofilms and struvite stones, which further complicates infections. Biofilm formation provides a shield against antibiotics, rendering infections persistent and difficult to treat. The increasing resistance of P. mirabilis to antibiotics highlights an urgent need for innovative therapeutic approaches. Ciprofloxacin, a commonly used antibiotic, significantly reduces 33–55 % of the biofilm’s biomass. Complementary strategies, including the use of phytochemicals and nanoparticles (NPs), have emerged as promising alternatives. Phytochemicals, such as allicin and curcumin, target specific virulence factors, whereas nanoparticles reduce biomass up to 53.4 %. Lactobacilli spp., such as L. gasseri produce lactic acid, which inhibits growth and prevents the formation of urinary stones caused by P. mirabilis . Additionally, phage therapy offers targeted solutions that combine phage vB PmiS-TH with ampicillin, causing removal of the biofilm after 24 h and preventing urinary tract infections. Targeted therapies addressing virulence factors, combined with traditional and novel antimicrobial strategies, have the potential to improve patient outcomes, particularly those vulnerable to severe complications, such as the elderly and immunocompromised individuals.
Environmentally Friendly Synthesis of Coumarin–Pyrazolo[1,5-a]pyrimidine Hybrids with Potent Antibacterial and Antibiofilm Activities T. R. A. Sangma, L. B. Marpna, M. Rymbai, S. Kaping, V. V. Borah, J. N. Vishwakarma Russian Journal of Bioorganic Chemistry, 2025 Abstract Objective: This study aimed to synthesize a series of coumarin–pyrazolo[1,5-a]pyrimidine hybrid compounds and evaluate their potential antibacterial and antibiofilm activities. Methods: In our synthetic approach, a mixture of 3-acetylcoumarin (I) and N,N-dimethylformamide dimethyl acetal (DMF-DMA) was refluxed in toluene to afford the enaminone intermediate (II). Subsequent condensation with 3-aminopyrazoles in the presence of potassium hydrogen sulfate (KHSO4) yielded a series of 7-(2-oxo-2H-chromen-3-yl)pyrazolo[1,5-a]pyrimidine derivatives. The structures of the synthesized compounds were confirmed using spectroscopic and analytical techniques, including FT-IR, 1H, 13C NMR, and high-resolution mass spectrometry (HRMS). Antibacterial and antibiofilm activities were evaluated against Staphylococcus epidermidis ATCC 35984 and Pseudomonas aeruginosa using MIC, MIC50 assays, and biofilm formation inhibition studies. Results and Discussion: The synthesized coumarin–pyrazolo[1,5-a]pyrimidine (CPP) hybrids (IVa–IVj) were obtained in high yields (74–92%) within short reaction times (9–18 min). These compounds exhibited significant anti-adhesion and antibiofilm activities against both S. epidermidis and P. aeruginosa. All compounds were tested for their ability to inhibit bacterial cell adhesion to polystyrene surfaces. Conclusions: Hybrids (IVd) and (IVe) demonstrated outstanding and consistent antibiofilm activity against strong biofilm-forming strains, S. epidermidis ATCC 35984 and P. aeruginosa, indicating broad-spectrum efficacy at low concentrations.
Quantitative phytochemical analysis reveals significant antibiofilm activity in pleione maculata, an endangered medicinal orchid Hakani D. Sympli, Supriyo Sen, Bahunlang Susngi, Vedant Vikrom Borah Journal of Pure and Applied Microbiology, 2021 Pleione maculata has no scientific reports on quantitative phytochemical and antibiofilm activity till date. The objective of the study was to quantify and determine medicinally important bioactivity in P. maculata and analyse its anti-biofilm activity against clinical isolates Staphyloccocus aureus, Klebsiella pneumoniae and Proteus mirabilis. P. maculata exhibited the highest Total Antioxidant Capacity (TAC) about 193.98±0.1 mg, highest Total Phenolic Content (TPC) at 552±0.0 mg and Total Flavonoid Content (TFC) were observed highest at 879.5±0.2 mg. The acetone and ethyl acetate extracts of P. maculata pseudobulb showed distinct and significant zone of inhibition (ZOI) against drug-resistant S.aureus about 16±0.00 mm (MIC 0.875 mg/mL), ZOI of acetonitrile pseudobulb extract against P. mirabilis was 15.33±0.4 mm (MIC 1 mg/mL), ZOI of acetonitrile extracts of leaves and stem, ethyl acetate extract of pseudobulb was 12±0.0 mm, 12±01.4 mm, 12±2.8 mm against K. pneumoniae (MIC 1.8 mg/mL, 0.68 mg/mL and 3 mg/mL). Acetonitrile extract of pseudobulbs exhibited the highest Minimum Biofilm Inhibition concentration (MBIC) at 0.25 mg/mL against S. aureus, water root extract inhibited attachment of K. pneumoniae with lowest MBIC value 0.093 mg/mL, water and acetone extract of leaves inhibited cell attachment of P. mirabilis at lowest MBIC 0.117 and 0.171 mg/mL. The UV-VIS absorption band of P. maculata extracts ranges from 204-665 nm indicating the presence of phenolic and flavonoid compounds. The study indicates the potentiality of P. maculata as a rich source of medicinal active compounds as an antibiofilm agent against antibiotic-resistant clinical isolates.
Enhydra fluctuans: A review on its pharmacological importance as a medicinal plant and prevalence and use in north-east India International Journal of Pharmacy and Pharmaceutical Sciences, 2014
Comparative screening of antibacterial and antifungal activity of six ethno-medicinally important plants of Assam International Journal of Pharma and Bio Sciences, 2013
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