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Ewolucja czy rewolucja w terapii nabytej niewydolności rąbka rogówki: Holoclar® – nowy lek zawierający komórki macierzyste nabłonka rogówki

100%
Dobrowolski D., Wowra B., Wróblewska-Czajka E., Krysik K., Grolik M., Wylęgała E.
OphthaTherapy
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2018
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vol. 5
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issue 3
137-141
EN
Treatment of corneal limbal insufficiency has entered a new stage. The cells from the culture were used in the therapy. The tissue produced in the laboratory contains stem cells of the corneal epithelium obtained from the limbal zone. With this technology, replacing the pathological tissue with the cultured epithelium gives its constant renewal, as it happens under physiological conditions. Only 2 mm2 of the corneal limbus is needed to initiate the culture, the harvested cells produce a normal multilamellar, stratified epithelium, that also contains a population of stem cells. Long-term observations confirm that this method can permanently maintain the epithelial surface of the cornea.
PL
Leczenie niewydolności rąbka rogówki wkroczyło w nowy etap. W terapii zastosowano komórki pochodzące z hodowli. Tkanka uzyskana w laboratorium zawiera komórki macierzyste nabłonka rogówki pozyskane ze strefy rąbkowej. Dzięki temu zastąpienie hodowanym nabłonkiem patologicznych tkanek zapewnia jego stałą odnowę, tak jak dzieje się to w warunkach fizjologicznych. Do inicjacji hodowli wystarczy zaledwie 2 mm2 rąbka rogówki; pobrane komórki wytwarzają prawidłowy wielowarstwowy nabłonek, który zawiera też pulę komórek macierzystych. Odległe obserwacje potwierdzają, że z zastosowaniem tej metody można trwale odtwarzać powierzchnię nabłonkową rogówki.
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THE INFLUENCE OF STORAGE TEMPERATURE AND UV-IRRADIATION ON FREE RADICAL SCAVENGING PROPERTIES OF ETHANOLIC EXTRACTS OF PROPOLIS

84%
Komosińska-Vassev K., Olczyk P., Ramos P., Mencner L., Derkacz A., Waluga E., Krysik K., Olczyk K., Pilawa B.
Acta Poloniae Pharmaceutica - Drug Research
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2018
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vol. 74
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issue 6
1833-1840
EN
The free radical scavenging activity of ethanolic extracts of propolis (EEP) at the concentrations of 3%, 7%, and 10% was examined. The impact of storage temperature and exposure to ultraviolet (UV) light on the interactions of extracts of propolis with the model DPPH free radicals was also determined. The quenching of an X-band electron paramagnetic resonance spectra of DPPH free radicals by the extracts stored at room temperature, heated at the temperature of 50 oC and exposed to UV-irradiation, were compared. The examined propolis ethanolic extracts revealed an antioxidative character. The storage of the samples at a higher temperature (50 oC) caused a decrease of the scavenging activity equaling to 7% and 10% EEP. UV-irradiation of the 3% EEP increased the quenching of DPPH free radical lines. The reverse effect was observed for the 7% and 10% propolis extracts. The 3% ethanolic extract of propolis is more stable for storage at 50ºC, and less than other analyzed EEP susceptible for UV-irradiation. Alterations of the antioxidative properties of the analyzed EEP and changes in the kinetics of their interactions with free radicals, indicate that 3%, 7%, and 10% propolis extracts should not be exposed to the temperature of 50 oC and UV-irradiation.
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