期刊
CANCER LETTERS
卷 555, 期 -, 页码 -出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.canlet.2022.216030
关键词
Cytidine deaminase (Cda); Cda; knockout mice; Genetic instability; Poly(ADP-Ribose) polymerase 1(Parp-1); Cancer
类别
Cytidine deaminase (CDA) catalyzes the deamination of cytidine (C) and deoxycytidine (dC) to uridine and deoxyuridine, respectively. CDA deficiency leads to genomic instability, and we investigated its role in cancer development using a mouse model. While Cda-/- mice did not differ from Cda+/+ mice in lifetime phenotypic or behavioral characteristics, or in the frequency or type of spontaneous cancers, they had a significantly lower frequency of chemically induced colon tumors. Our results suggest that an absence of Cda limits chemically induced tumors.
Cytidine deaminase (CDA) catalyzes the deamination of cytidine (C) and deoxycytidine (dC) to uridine and deoxyuridine, respectively. We recently showed that CDA deficiency leads to genomic instability, a hallmark of cancers. We therefore investigated whether constitutive CDA inactivation conferred a predisposition to cancer development. We developed a novel mouse model of Cda deficiency by generating Cda-knockout mice. Cda+/+ and Cda-/- mice did not differ in lifetime phenotypic or behavioral characteristics, or in the frequency or type of spontaneous cancers. However, the frequency of chemically induced tumors in the colon was significantly lower in Cda-/- mice. An analysis of primary kidney cells from Cda-/- mice revealed an excess of C and dC associated with significantly higher frequencies of sister chromatid exchange and ultrafine anaphase bridges and lower Parp-1 activity than in Cda+/+ cells. Our results suggest that, despite inducing genetic instability, an absence of Cda limits the number of chemically induced tumors. These results raise questions about whether a decrease in basal Parp-1 activity can protect against inflammation-driven tumorigenesis; we discuss our findings in light of published data for the Parp-1-deficient mouse model.
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