Dear all
when I add different concentrations of pepstatin A (10, 25, 50 microM final, stock was dissolved in DMSO) to DMEM it is precipitated and shaking the culture dish does not help. any recommendation?
thanks
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3 replies to this topic
#2
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an elder
Posted 02 July 2009 - 10:04 AM
we always make up our pepstatin in methanol.
most of the literature from the suppliers recommend methanol or ethanol (sigma is the only company i found that mentions dmso).
the companies say that the working concentration range is 0.5-1 ug/ml (sigma says 1uM). you may be trying to put too much in to your medium.
most of the literature from the suppliers recommend methanol or ethanol (sigma is the only company i found that mentions dmso).
the companies say that the working concentration range is 0.5-1 ug/ml (sigma says 1uM). you may be trying to put too much in to your medium.
talent does what it can
genius does what it must
i do what i get paid to do
genius does what it must
i do what i get paid to do
#3
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Enthusiast
Posted 02 July 2009 - 12:28 PM
thanks mdfenko, but according to sigma data sheet they mentioned that (At 25 mg/mL DMSO Pepstatin A forms a clear, faint yellow solution). So do I have to purchase a new one?
As for the concentration used according to this paper: http://www.pubmedcentral.nih.gov/articlere...bmedid=19425170
they used pepstatin A at 10 μg/ml final. and in another cancer research paper they used 100 microM concentration final. Do you use it to inhibit cell death or inhibit autophagy (in combination with E64D)?
thanks
As for the concentration used according to this paper: http://www.pubmedcentral.nih.gov/articlere...bmedid=19425170
they used pepstatin A at 10 μg/ml final. and in another cancer research paper they used 100 microM concentration final. Do you use it to inhibit cell death or inhibit autophagy (in combination with E64D)?
thanks
#4
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an elder
Posted 06 July 2009 - 07:50 AM
we were using pepstatin, at 1ug/ml [final], as part of an inhibitor panel for the proteases with which we worked.
i don't know if you have to buy more (did you solubilize the whole thing?). i would.
you could try to slowly increase the concentration of pepstatin in your medium.
i don't know if you have to buy more (did you solubilize the whole thing?). i would.
you could try to slowly increase the concentration of pepstatin in your medium.
talent does what it can
genius does what it must
i do what i get paid to do
genius does what it must
i do what i get paid to do
