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p53 and cell-cycle-regulated protein expression in small intestinal cells after fast-neutron irradiation in mice

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Abstract

The involvement of the p53 gene in apoptosis of many cell types towards γ-radiation is well established. However, little information is available on the relationship between p53 status and cells’ ability to undergo apoptosis following exposure to fast neutrons. The aim of this study was to characterize the apoptotic pathway traveled by neutrons in mouse intestinal crypt cells. Each mouse received whole body doses of 0.25–8 Gy fast neutrons and were sacrificed 0, 4, 6, 12, 24, 48, and 72 h, respectively, after irradiation. Apoptosis of crypt cells and expression of p53, cyclin A, cyclin B, cyclin D, and cyclin E were measured. The apoptosis in crypt cells was maximal at 4 and 6 h after irradiation, showing a gradual decline at 24 h. The highest frequency of apoptosis was seen at a 1 Gy dose and then declined gradually beyond a 2 Gy dose with high levels of damage. In immunoblot analysis, apoptosis was confirmed to be dependent on p53 function after fast-neutron irradiation. In addition, cyclin B1, cyclin D, and cyclin E were overexpressed in intestinal cells after fast-neutron irradiation and their immunoreactivities were increased strongly in round and oval cells of laminar propria in villi core and crypts. The results of the current study suggest that apoptosis in crypt cells shows a time- and dose-dependent increase after fast-neutron irradiation. In addition, fast-neutron-induced apoptosis in mouse intestinal crypt cells appears to be related to the increase in functional p53 proteins to a level sufficient to initiate apoptosis and up-regulation of cell-cycle-regulated proteins, which may lead to resistance to DNA damage through cell cycle arrest, is involved deeply in protection of gastrointestinal cells after low doses of fast-neutron irradiation. (Mol Cell Biochem 270: 21–28, 2005)

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Authors and Affiliations

  1. Department of Veterinary Medicine, Cheju National University, Cheju

    Young-Heun Jee, In-Sun Hwang, Mee-Jung Ahn & Hong-Gu Joo

  2. College of Veterinary Medicine, Kyungpook National University, Daegu, South Korea

    Won-Il Jeong, Tae-Hwan Kim & Kyu-Shik Jeong

  3. College of Dentistry, Kyungpook National University, Daegu, 702-201, South Korea

    Su-Hyung Hong & Kyu-Shik Jeong

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  1. Young-Heun Jee
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Correspondence to Kyu-Shik Jeong.

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Jee, YH., Jeong, WI., Kim, TH. et al. p53 and cell-cycle-regulated protein expression in small intestinal cells after fast-neutron irradiation in mice. Mol Cell Biochem 270, 21–28 (2005). https://doi.org/10.1007/s11010-005-3440-2

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  • DOI: https://doi.org/10.1007/s11010-005-3440-2

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