Re: endogenous peroxidase,
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From: | "John C. Dennis" <dennijc@vetmed.auburn.edu> |
To: | Bruce A Rasmussen <brasmuss@osf1.gmu.edu> |
Reply-To: | |
Date: | Mon, 05 Apr 1999 18:16:46 -0500 (CDT) |
Content-Type: | TEXT/PLAIN; charset=US-ASCII |
Bruce
I work with rat brain. I've found that background is frequently a
function of the primary antibody and how much "non-specific" affinity any
particular antibody has for rat brain. I've also found that some cell
types will show signal if the tissue is not quenched. Whether or not the
signal/lack of signal is caused by endogenous peroxidase-like activity or
if the peroxide/methanol treatment degrades the antigenicity of the
epitope, I haven't investigated. I did try H2O2 in buffer a couple of
months ago and got a very different staining pattern than H2O2 in MetOH
with the same antibody and in fact the H2O2/buffer showed staining in a
cell population on the negative control (no primary) tissues.
The upshot is that you need to keep and eye on your controls and consider
the
behavior of the tissue with a particular antibody.
Beam me up!
John Carroll Dennis
Anatomy, Physiology, and Pharmacology
109 Greene Hall
Auburn University, AL 36849
On Mon, 5 Apr 1999, Bruce A Rasmussen wrote:
>
> Is background staining caused by endogenous peroxidase mainly a blood
> confound? In other words with well perfused brain tissue is H202
> unnecessary or not worth the tissue damage and loss of immunoreactivity?
> Many thanks,
> Bruce
>
>
>
> --------------------------------------
> Bruce Rasmussen
> Predoc Fellow in Experimental Neuropsychology
> The Krasnow Institute for Advanced Study
> George Mason University
> Mail Stop 2A1
> Fairfax, VA 22030-4444
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