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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 2000 Oct;91(10):1044–1050. doi: 10.1111/j.1349-7006.2000.tb00883.x

Adenovirus‐mediated Transfer of Fas Ligand Gene Augments Radiation‐induced Apoptosis in U‐373MG Glioma Cells

Nobusada Shinoura 1,2,✉, Naoki Yamamoto 1,3, Akio Asai 4, Takaaki Kirino 4,5, Hirofumi Hamada 1,3
PMCID: PMC5926259  PMID: 11050476

Abstract

Most malignant astrocytomas (gliomas) express a high level of Fas, whereas the surrounding normal tissues such as neurons and astrocytes express a very low level of Fas. Thus, transduction of Fas ligand would selectively kill malignant astrocytoma cells. On the other hand, glioma cells harboring p53 mutation have been reported to be resistant to conventional therapies including radiation. To override the resistance mechanism of glioma cells with p53 mutation to radiation, we transduced U‐373MG malignant astrocytoma (glioma) cells harboring mutant p53 with Fas ligand via an adenovirus (Adv) vector in combination with X‐ray irradiation, and evaluated the degree of apoptosis. The degree of apoptosis in U‐373MG cells infected with the Adv for Fas ligand (Adv‐FL) and treated with irradiation (81%) was much higher than that in U‐373MG cells infected with Adv‐FL and not treated with irradiation (0.8%) or that in U‐373MG cells infected with the control Adv for lacZ and treated with irradiation (5.0%). In U‐373MG cells infected with Adv‐FL, irradiation increased the expression of Fas ligand. Coincident with the increase in Fas ligand, there was a marked reduction in the caspase‐3 level and a marked increase in the cleaved form of poly(ADP‐ribose) polymerase (PARP), which are downstream components of Fas ligand‐mediated apoptosis. This suggests that the enhanced activation of caspase‐3 by the transduction of Fas ligand combined with irradiation, induced extensive apoptosis in U‐373MG cells. In summary, transduction of Fas ligand may override the resistance mechanism to radiotherapy in glioma cells harboring p53 mutation.

Keywords: Apoptosis, Radiation, Fas ligand, Glioma, Adenovirus

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