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LIFE01200604005 Shri Somnath Ghosh - Homi Bhabha National ...

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CHAPTER 3<br />

RESULTS<br />

Fig.3.2.2 Gene expression of ATM, DNA-PK, ATR, Chk1 and Chk2 in A 549 cells irradiated<br />

with 2Gy Proton Beam or 2Gy γ-radiation at 2, 3 or 4h after irradiation. Total RNA from A 549<br />

cells was isolated and reverse transcribed. RT-PCR analysis of ATM, DNA-PK, ATR, Chk1 and<br />

Chk2 genes was carried out as described in materials and methods. PCR products were resolved<br />

on 1.5% agarose gels containing ethidium bromide. β-Actin gene expression in each group was<br />

used as an internal control. Ratio of intensities of (A & B) ATM, DNA-PK or ATR, (C & D)<br />

Chk1 and Chk2 band to that of respective β-actin band as quantified from gel pictures are shown<br />

above each gel picture. Con means unirradiated control. Data represents means ± SE of three<br />

independent experiments; significantly different from unirradiated controls: *P < 0.05, **P <<br />

0.01.<br />

141

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