Chronic wounds and their associated bacterial infections are major issues in modern health care systems. Therefore, antimicrobial resistance (AMR), treatment costs, and number of disability-adjusted life-years have gained more interest. Recently, photodynamic therapy emerged as an effective approach against resistant and naïve bacterial strains with a low probability of creating AMR. In this study, needleless electrospinning was used to produce an indocyanine green (ICG) loaded poly(d,l-lactide) nanofibrous mesh as a photoresponsive wound dressing. The non-woven mesh had a homogeneous nanofibrous structure and showed long-term hydrolytic stability at different pH values. The antimicrobial activity was tested against several bacterial strains, namely Staphylococcus saprophyticus subsp. bovis, Escherichia coli DH5 alpha, and Staphylococcus aureus subsp. aureus. Upon irradiation with a laser of a specific wavelength (λ = 810 nm), the bacterial viability was significantly reduced by 99.978% (3.66 log10), 99.699% (2.52 log10), and 99.977% (3.64 log10), respectively. The nanofibrous mesh showed good biocompatibility, which was confirmed by the proliferation of mouse fibroblasts (L929) on the surface and into deeper parts of the mesh. Furthermore, a favorable proangiogenic effect was observed in ovo using the chorioallantoic membrane assay. In general, it can be concluded that ICG loaded nanofibers as an innovative wound dressing represent a promising strategy against chronic wounds associated with skin infections.
- MeSH
- biokompatibilní materiály chemie farmakologie MeSH
- buněčné linie MeSH
- chorioalantoická membrána krevní zásobení účinky léků MeSH
- Escherichia coli účinky léků růst a vývoj MeSH
- fibroblasty cytologie účinky léků MeSH
- fotochemoterapie MeSH
- indokyanová zeleň chemie farmakologie MeSH
- mikrobiální viabilita účinky léků MeSH
- myši MeSH
- nanovlákna MeSH
- obvazy MeSH
- polyestery chemie MeSH
- proliferace buněk účinky léků MeSH
- Staphylococcus aureus účinky léků růst a vývoj MeSH
- Staphylococcus saprophyticus účinky léků růst a vývoj MeSH
- zvířata MeSH
- Check Tag
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
Partial nephrectomy (PN) is a recommended type of treatment of localised renal tumors. Real-time intraoperative imaging technique, such as fluorescence imaging with indocyanine green (ICG) administration helps to improve intraoperative and postoperative outcomes in patients who underwent PN. Our work presents results of patients who underwent robotic PN with ICG navigation. A total of 37 patients underwent robotic PN with application of ICG between April 2015 and May 2019. A total amount of 5 mg of ICG was applied intravenously, and then robotic PN was performed with fluorescent imaging. ICG was used by the surgeon's decision according to unfavourable anatomical properties of tumor or to high R.E.N.A.L. nephrometry score. An exact border between perfused and nonperfused tissue was detected, and exact tumor's branch of the renal artery was clamped. Robotic PN with ICG-fluorescence imaging navigation was performed in 37 cases with a preoperative average diameter of tumor of 31 mm. The mean surgery time was 133 minutes, and the mean estimated blood loss was 190 mL. Arterial clamping was performed in 35 cases. The mean duration of warm ischemia was 14 minutes. Application of ICG enabled specific tumor-supplying vessel clamping in 25 cases. Two complications of grade II according to the Clavien-Dindo classification occurred intraoperatively, and one complication of grade III was observed. Renal function changes showed favourable results for the cases with superselective clamping. Finally, an administration of ICG eases superselective clamping of tumor-specific branch of renal artery and helps to preserve normal renal function with acceptable oncological results.
- MeSH
- dospělí MeSH
- indokyanová zeleň chemie MeSH
- lidé středního věku MeSH
- lidé MeSH
- nádory ledvin diagnostické zobrazování chirurgie MeSH
- nefrektomie * MeSH
- optické zobrazování * MeSH
- počítačová rentgenová tomografie MeSH
- roboticky asistované výkony * MeSH
- senioři MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- klinické zkoušky MeSH
Indocyaninová zeleň patří mezi fluorescenční barviva (fluorofory, fluorochromy). Jedná se o chemické sloučeniny obsahující ve své molekule reaktivní skupinu, která je schopna reagovat s nukleofilními skupinami. Podstatou fluorescence je vyzáření energie ve velmi krátkém čase, nejčastěji vyvolané účinkem jiného dopadajícího záření. Každá látka je charakterizována dvěma typy spekter – excitačním a emisním spektrem. ICG má excitační i emisní spekrum v tzv. blízké infračervené oblasti, hovoříme o NIR (near infrared) flouroforu. ICG je dosud jediným NIR barvivem, které má FDA (US Food and Drug Administration) atest pro použití v biomedicíně od roku 1959 (1). Zejména v posledních letech jí je věnována velká pozornost pro stále se rozšiřující indikace použití v klinické medicíně. Již tradičně je využívána v očním lékařství k diagnostice chorob oční sítnice, dále ke stanovení srdečního výdeje a měření jaterních funkcí. Uplatnění však nachází i při detekci sentinelových uzlin v onkochirurgii a s úspěchem je využívána například v neurochirurgii, v cévní chirurgii či rekonstrukční chirurgii k hodnocení mikrocirkulace volně přenesených tkáňových celků. Předkládané review přináší přehled informací o základních chemických a fyzikálních vlastnostech látky a o možnostech jejího využití v klinických aplikacích.
Indocyanine green (ICG) is one of the types of fluorescent dyes (fluorophores, fluorochromes). It is a chemical compound containing a reactive group capable of reacting with nucleophilic groups. The principle of fluorescence is the emission of energy in a very short time, caused by the effect of radiation. Each fluorescent substance is characterized by two types of spectra – an excitation and an emission spectrum. ICG has an excitation and emission spectrum in the near infrared region, hence the so-called NIR (near infrared) fluorophores. ICG is the only NIR dye that has been certified by the FDA (U.S. Food and Drug Administration) for use in biomedicine since 1959 (1). Especially in recent years, indocyanine green has received a lot of attention due to its ever-expanding indications for use in clinical medicine. It has been traditionally used in ophthalmology to diagnose diseases of the retina as well as to determine cardiac output and to measure liver function. However, it is also used in surgical oncology to detect sentinel nodes and in neurosurgery, vascular surgery or reconstructive surgery to evaluate microcirculation following free tissue transfer. The article presents an overview of the basic chemical and physical properties of the substance and the possibilities for its use in clinical applications.
- MeSH
- chirurgie operační * MeSH
- fluoresceinová angiografie MeSH
- fluorescence * MeSH
- indokyanová zeleň * diagnostické užití chemie MeSH
- lidé MeSH
- neurochirurgie MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- přehledy MeSH
The present study investigates the photochemical properties of a potential photosensitiser, indocyanine green (ICG), in an in vitro HeLa cell system. Cell proliferation was studied after a combined effect of ICG, at a concentration range of 24-94 microM, and therapeutic laser irradiation at several different energy densities. In addition, ICG cytotoxicity was evaluated in HeLa cells and V79 Chinese hamster by the MTT assay. Phototoxicity was evaluated at 1, 24, and 48 h after irradiation. No phototoxic effect was detected 1h after irradiation. The maximum phototoxic effect of ICG on HeLa cells was detected for an ICG concentration of 94 microM, a laser output of 360 mW, and an energy density of 99 J/cm(2) at 24h after irradiation. Potentiation of the ICG phototoxic effect was achieved by adding 20 microM H(2)O(2), which was a non-toxic concentration for HeLa cells in this experimental design. At 48 h after laser irradiation a statistically significant difference was found between the toxicity of ICG plus peroxide, as compared to ICG alone. The addition of H(2)O(2) at a concentration of 20 microM caused a significant increase in phototoxicity of ICG for HeLa cells. Our results confirm that ICG could be a perspective agent for use in photodynamic therapy and that its phototoxic effect can be potentiated by addition of an oxidative agent.
- MeSH
- buněčné linie MeSH
- financování organizované MeSH
- fotochemie MeSH
- fotosenzibilizující látky chemie toxicita MeSH
- HeLa buňky MeSH
- indokyanová zeleň chemie toxicita MeSH
- křečci praví MeSH
- lidé MeSH
- molekulární struktura MeSH
- proliferace buněk účinky léků účinky záření MeSH
- zvířata MeSH
- Check Tag
- křečci praví MeSH
- lidé MeSH
- zvířata MeSH
