I am having a few questions about observations I made recently. I work with HK-2 cell line (epithelial cells from proximal tubule of the kidney) which are (for the sake of my experiments) submitted to oxidative stress. We know oxidative stress leads to DNA damages ; and these damages may in turn lead to cell cycle arrest. What I observed (and what is already well described in many papers relative to my subject) was a cell cycle arrest at G2/M checkpoint.
This arrest supposedly occurs to let the cell try to repair its DNA.
Thus, my question is : what happens in a cell whose cell cycle is arrested at G2/M checkpoint ?
I believe background functions are still operating (Krebs cycle, ion equilibrium pumping, ...).
But what about specific functions such as specific proteins expression. For instance, cadehrin occuring in tight junctions: are these supposed to be still present ? (as the cell was almost about to divide) And what about cytokine excretion? Should it excrete twice the amount as G0 or G1 cell ?