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Alkylating agent hypersensitivity in poly(adenosine diphosphate-ribose) polymerase deficient cell lines
S Chatterjee1, M F Cheng, S J Berger
1Department of Medicine, University Hospitals of Cleveland, Case Western Reserve University, Ohio 44106.
Cancer Communications
|March 1, 1991
Summary
Poly(ADP-ribose) polymerase deficiency in V79 cells increases sensitivity to DNA damaging agents. These findings highlight the enzyme's crucial role in repairing DNA damage from alkylating agents and radiation.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Poly(ADP-ribose) polymerase (PARP) is a key enzyme in DNA repair.
- PARP-deficient cell lines (ADPRT 54, ADPRT 351) exhibit hypersensitivity to radiation and topoisomerase I inhibitors.
- These mutants are resistant to topoisomerase II inhibitors.
Purpose of the Study:
- To investigate the role of poly(ADP-ribose) polymerase in DNA repair.
- To determine the sensitivity of PARP-deficient mutants to various alkylating agents and UV-mimetic compounds.
Main Methods:
- Utilized V79 cell line and its poly(ADP-ribose) polymerase deficient mutants (ADPRT 54, ADPRT 351).
- Assessed cellular sensitivity to a range of alkylating agents (alkylsulfonates, alkylnitrosoureas, nitrosoguanidine) and 4-nitroquinoline-1-oxide.
- Analyzed survival curves to evaluate the impact on sublethal damage repair.
Main Results:
- PARP-deficient mutants showed hypersensitivity to diverse alkylating agents.
- Hypersensitivity was also observed in response to the UV-mimetic agent 4-nitroquinoline-1-oxide.
- A decrease in the shoulder region of survival curves indicated impaired repair of sublethal DNA damage.
Conclusions:
- Poly(ADP-ribose) polymerase is critically involved in repairing DNA damage induced by alkylating agents.
- The enzyme plays a significant role in the cellular response to damage caused by UV- and X-irradiation and radiomimetic agents.
- PARP deficiency impairs the repair of sublethal DNA damage, impacting cell survival.