Richard A. Lockshin yo_doc at
Tue Jun 11 09:03:55 EST 1996

If you are actually using this in intact animals, it is not a good idea. 
Even in vitro, cycloheximide will eventually kill cells.  1 mcg/ml is
commonly used, though lower is better if you can.  What people look for is
the following:  they have a system in which apoptosis occurs early and is
easily recognized (generally a few hours).  Then, in the presence of
cyclohex, they prevent this death for a day or two.  In some systems, if
one withdraws the cyclohex, the cells may recover, or may shortly
thereafter initiate apoptosis.  Most cells will finally run out of an
essential enzyme and die after 1 or 2 days. 
On Jun 11, 1996 10:48:55 in article <Re: CYCLOHEXIMIDE & Protein synthesis
INHIBITION!>, 'Luc Nieland <lucn at>' wrote: 
>Dr.M.M.Rajan wrote: 
>> Dear Reader, 
>>         I am working on Neuroblastoma differentiation and Apoptosis. 
>>         I would like to find out the optimal protein synthesis
>> concentrations of cycloheximide, which is also non toxic. 
>> I have been using tritiated proline incorporation assay, to determine 
>> this, but the non-toxic concentrations are not inhibitory to protein 
>> synthesis. 
>> Thanking you in anticipation 
>> Yours 
>> Dr.Rathna 
>> National Centre for Cell Science 
>For MR65 cells 500 ug/ml was used by a colleague of mine. This
>induces apoptosis. (Eur J Cell Biol 68:35-46 (1995) 
>| luc.nieland at            Mol.Cell Biology,  RL  | 
>| room: 5.214 -> phone: (043-3881357)         FacII, Uns. 50         | 
>| lab.: 5.219 -> phone: (043-3881360)         Maastricht             | 
Richard A. Lockshin 

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