The response of L5178Y lymphoma sublines to oxidative stress: antioxidant defence, iron content and nuclear translocation of the p65 subunit of NF-kappaB

• Autorzy: Bouzyk E. , Gradzka I. , Iwanenko T. , Kruszewski M. , Sochanowicz B. , Szumiel I.
• Języki publikacji: EN

Abstrakty

EN

We examined the response to hydrogen peroxide of two L5178Y (LY) sublines which are inversely cross-sensitive to hydrogen peroxide and X-rays: LY-R cells are radioresistant and hydrogen peroxide-sensitive, whereas LY-S cells are radiosensitive and hydrogen peroxide-resistant. Higher initial DNA breaks and higher iron content (potentially active in the Fenton reaction) were found in the hydrogen peroxide sensitive LY-R cells than in the hydrogen peroxide resistant LY-S cells, whereas the antioxidant defence of LY-R cells was weaker. In particular, catalase activity is twofold higher in LY-S than in LY-R cells. The content of monobromobimane-reactive thiols is 54% higher in LY-S than in LY-R cells. In contrast, the activity of glutathione peroxidase (GPx) is about two times higher in LY-R than in LY-S cells; however, upon induction with selenium the activity increases 15.6-fold in LY-R cells and 50.3-fold in LY-S cells. Altogether, the sensitivity difference is related to the iron content, the amount of the initial DNA damage, as well as to the efficiency of the antioxidant defence system. Differential nuclear translocation of p65-NF-kappaB in LY sublines is due to the more efficient antioxidant defence in LY-S than in LY-R cells.

Słowa kluczowe

EN

lymphoma; LY-R cell; p65 subunit; nuclear translocation; LY-S cell; hydrogen peroxide; X-ray; oxidative stress; iron content; lovastatin; antioxidant defense

• Wydawca: -
• Czasopismo: Acta Biochimica Polonica
• Rocznik: 2000
• Tom: 47
• Numer: 4
• Opis fizyczny: p.881-888,fig.,ref.

Twórcy

autor

Bouzyk E.

• Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland

autor

Gradzka I.

autor

Iwanenko T.

autor

Kruszewski M.

autor

Sochanowicz B.

autor

Szumiel I.

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