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LIFE01200604005 Shri Somnath Ghosh - Homi Bhabha National ...

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SYNOPSIS<br />

Ratio of Rad52 to Actin<br />

Ratio of MLH1 to Actin<br />

140<br />

120<br />

100<br />

80<br />

60<br />

40<br />

20<br />

0<br />

1.8<br />

1.6<br />

1.4<br />

1.2<br />

1.0<br />

0.8<br />

0.6<br />

0.4<br />

0.2<br />

0.0<br />

Role of Rad 52 and MLH1 in relative radioresistance<br />

Con 2Gy 5X2Gy 10Gy<br />

Con 2Gy 5X2Gy 10Gy<br />

Rad52<br />

Actin<br />

MLH1<br />

Ratio of Rad52 to Actin<br />

Ratio of MLH1 to Actin<br />

0.6<br />

0.5<br />

0.4<br />

0.3<br />

0.2<br />

0.1<br />

0.0<br />

1.0<br />

0.8<br />

0.6<br />

0.4<br />

0.2<br />

0.0<br />

Con 2Gy 5X2Gy 10Gy<br />

Treatment<br />

Con 2Gy 5X2Gy 10Gy<br />

Treatment<br />

Rad52<br />

MLH1<br />

Rad52<br />

Actin<br />

MLH1<br />

Actin<br />

A549 cells<br />

Actin<br />

MCF-7 cells<br />

Fig. 3.1E. Gene expression of Rad52 and MLH1 in MCF-7 and A 549 cells. Key;<br />

Lane 1, control unirradiated A549 cell line. Lane 2, 2 Gy acute dose ( single dose that<br />

was delivered in each fraction ) of 60 Co γ-irradiation Lane 3 2 Gy of 60 Co γ-irradiation<br />

daily over a period of 5 days, Lane 4, 10 Gy acute (which is the sum total of all the<br />

fraction ) 60 Co γ-irradiation.<br />

mRNA stability of DNA-PK<br />

Relative expression of DNA-PK<br />

30000<br />

25000<br />

20000<br />

15000<br />

10000<br />

5000<br />

0<br />

2h+Act 2h+Act+In 4h+Act 4h+Act+In 6h+Act 6h+Act+In 8h+Act 8h+Act+In<br />

Time (h) 2 2 4 4 6 6 8 8<br />

Actinomycin (5mg/ml) + + + + + + + +<br />

p38 MAPK inhibitor (1µM) - + - + - + - +<br />

DNA-PK<br />

Fig. 3.1F Stabilization of DNA-PK mRNA in A549, which had been exposed to 2 Gy of<br />

60 Co γ-irradiation daily over a period of 5 days and its stabilization is control by p38<br />

MAP Kinase.<br />

11

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