Bazı Yapay Gözyaşı Damlalarının İnsan Karbonik Anhidraz Enzimi-II (hCA-II) Üzerindeki İnhibitör Etkileri

Öz

Karbonik anhidrazlar (CA), canlılarda karbondioksitin hidrasyonu ve bikarbonat anyonunun dehidrasyonu reaksiyonlarını tersinir olarak katalize eden, aktif bölgelerinde çinko iyonları içeren bir metalloenzimdir. Bu çalışmada, insan eritrositlerinden karbonik anhidraz II (hCAII), afinite (sefaroz 4B/L-tirozin-sülfanilamid) kolonu ile saflaştırıldı. Yapay gözyaşı damlalarının hCAII izoenzimi üzerindeki inhibitör etkisi araştırıldı. IC50 değerleri sodyum hiyalüronat için 1.01 µL, polivinil alkol+povidon için 140.06 µL, polietilen glikol+propilen glikol için 49.51 µL olarak hesaplandı. Sodyum hiyalüronat için Ki değeri 0.339±0.121 mM olarak bulundu. Bu sonuçlara göre, incelenen üç ilaç arasında uygulama hacmi (mikrolitre) açısından en etkili inhibitörün sodyum hiyalüronat olduğu görülmektedir.

Anahtar Kelimeler

• İnsan karbonik anhidraz II
• Suni gözyaşı damlaları
• İnhibisyon

Inhibitor Effects of Some Artificial Tears Drops on Human Carbonic Anhydrase Enzyme-II (hCA-II)

Öz

Carbonic anhydrases (CAs) are a metalloenzyme that contains zinc ions in their active sites, and they reversibly catalyze the reactions of hydration of CO2 and dehydration of HCO3-in the living. In this study, human carbonic anhydrase II (hCAII) isoenzyme was purified from human erythrocytes by affinity column (Sepharose 4B-L-tyrosine-sulfanilamide). The inhibitory effect of artificial tear drops on hCAII isoenzyme was investigated. IC50 values were calculated as 1.01 µL for sodium hyaluronate, 140.06 µL for polyvinyl alcohol+povidone, and 49.51 for polyethylene glycol+propylene glycol. The Ki value for sodium hyaluronate was found as 0.339±0.121 mM. According to these results, sodium hyaluronate was the most effective inhibitor in terms of application volume (microliter) among the three drugs examined.

Anahtar Kelimeler

• Carbonic anhydrase II
• artificial tears drops
• inhibition

Kaynakça

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