Strain dependent differences in a quantitative histological study and expression analysis in irradiated murine lung

Although clinical observation can often reveal individual differences in the severity of lung fibrosis after radiation therapy, the actual influences of inherent individual factor is difficult to determine a clinical setting. In this paper, the usefulness of mouse model for research of heterogeneity in response of cancer treatment was investigated.C57BL/6J and C3H/HeMs mice were used for pathological and transcriotional experiments. The thorax of mice was locally irradiated at a dose of 10 or 20 Gy. Four-fold more CD44 positive cells had accumulated in the lungs of C3H/HeMs than of C57BL/6J mice. At sites of lung inflammation, HA accumulated at 12 hours after irradiation and the rapid resolution was achieved within 2 weeks in the lungs in both C57BL/6J mice and C3H/HheMs mice. An immunochemical investigation of C57BL/6J mice lungs revealed dense collagen accumulation at 8 weeks. The expression of Cap1, II18 and Rad51ap1 was constantly higher for 72 hours in C3H/HeMs mice than C57BL/6J mice. The expression of Mmp12 and Per3 was more induced in C3H/HeMs mice than C57BL/6J mice at 12 hours after irradiation. The expresion of Ltf was especially higher at 1 hour after iiradiation and that of Ifi202a was more induced at 72 hour in C57BL/6J mice than C3H/HeMs mice. Investigations into the mechanism of radiation-induced lung damage using animal models showed a powerful impact upon molecular studies of individual radiosensitivity.Mouse Models of Human Cancer (B7