TY  - JOUR
A1  - Hassan, Soha A.
A1  - Schmithals, Christian
A1  - Harten, Maike von
A1  - Piiper, Albrecht
A1  - Korf, Horst-Werner
A1  - Gall, Charlotte von
T1  - Time‐dependent changes in proliferation, DNA damage and clock gene expression in hepatocellular carcinoma and healthy liver of a transgenic mouse model
T2  - International journal of cancer
N2  - Hepatocellular carcinoma (HCC) is highly resistant to anticancer therapy and novel therapeutic strategies are needed. Chronotherapy may become a promising approach because it may improve the efficacy of antimitotic radiation and chemotherapy by considering timing of treatment. To date little is known about time‐of‐day dependent changes of proliferation and DNA damage in HCC. Using transgenic c‐myc/transforming growth factor (TGFα) mice as HCC animal model, we immunohistochemically demonstrated Ki67 as marker for proliferation and γ‐H2AX as marker for DNA damage in HCC and surrounding healthy liver (HL). Core clock genes (Per1, Per2, Cry1, Cry2, Bmal 1, Rev‐erbα and Clock) were examined by qPCR. Data were obtained from samples collected ex vivo at four different time points and from organotypic slice cultures (OSC). Significant differences were found between HCC and HL. In HCC, the number of Ki67 immunoreactive cells showed two peaks (ex vivo: ZT06 middle of day and ZT18 middle of night; OSC: CT04 and CT16). In ex vivo samples, the number of γ‐H2AX positive cells in HCC peaked at ZT18 (middle of the night), while in OSC their number remained high during subjective day and night. In both HCC and HL, clock gene expression showed a time‐of‐day dependent expression ex vivo but no changes in OSC. The expression of Per2 and Cry1 was significantly lower in HCC than in HL. Our data support the concept of chronotherapy of HCC. OSC may become useful to test novel cancer therapies.
KW  - clock genes
KW  - hepatocellular carcinoma
KW  - Ki67 transgenic c‐myc/TGFα mice
KW  - γ‐H2AX
Y1  - 2020
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/56950
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-569506
SN  - 1097-0215
SN  - 0020-7136
VL  - 148
SP  - 226
EP  - 237
PB  - Wiley-Liss
CY  - Bognor Regis
ER  -