Tag Archives: in vitro

Antimicrobial PDT for prosthetic joint infections

Motivation for the study Periprosthetic joint infections after hip and knee replacement surgeries are associated with high patient morbidity and a large financial cost. Challenging two-stage revision surgeries are required with long antibiotics regimes that can have limited efficacy and cannot eradicate drug-resistant strains like MRSA (methicillin-resistant Staphylococcus aureus). This study aims to investigate the potential of photodynamic therapy with methylene blue to eradicate problematic bacteria associated with joint infections.… READ MORE

Photothermal therapy with platinum nanoparticles

Photothermal therapy efficiency Human ovarian cancer cells were plated on Petri dishes and incubated with platinum nanoparticles of varying sizes between 30 and 70 nm. After 24-hour incubation, irradiation was performed using a Modulight ML6600 laser at 808 nm together with an illumination kit (MLAKIT) tailored for Petri dish illumination. A small area of the dish was illuminated with the laser for five minutes with 45 W/cm2 irradiance. Calcein cell… READ MORE

Novel antimicrobial phototherapy against emerging infectious diseases

      Results PIAS-treated pathogens were effectively eradicated upon NIR illumination. The efficacy of PIAS was dependent on the NIR light dose, 50 J/cm2 eradicating all MRSA from the rat nasal tract (Figure 1). PIAS also saved all mice from fatal MRSA infections, similar to VCM+RFP antibiotics and even more effectively than VCM antibiotics alone (Figure 2). Unlike the antibiotics, PIAS acted selectively on the target pathogen and did… READ MORE

Development of heat shock protein 90-targeted PDT for inflammatory breast cancer

Motivation of the study In photodynamic therapy (PDT), systemically administered photosensitizer is activated within the tumor using focused near-infrared light, typically a laser with a wavelength matching the absorption peak of the photosensitizer. Several photosensitizers have been clinically approved for treatment of different cancers; however, their accumulation is non-tumor exclusive which exposes healthy tissues to side effects like daylight-induced phototoxicity. A promising strategy to improve tumor selectivity is to couple… READ MORE

In vitro illumination using ML8500: osmium-based anticancer photosensitizer with highest hypoxic activity reported to date

  Study protocol to determine wavelength, fluence, and irradiance activities of Os-4T:   Key observations Illumination parameters significantly affected the phototoxicity of Os-4T. Green light (525 nm) was more effective than red light (630 nm) at lower fluences, while maximal potency was achieved at both wavelengths when using fluences higher than 100 J/cm2. Irradiance affected the potency with both red and green light that were more effective when lower irradiances… READ MORE