RE: [Histonet] ethopropazine/acetylcholinesterase histochemistry

From:"Smith, Allen"

Back in the dark ages, we used diisopropylfluorophosphate as a
cholinesterase inhibitor.  It's very effective (and very expensive), but not
very specific: it also inhibits trypsin, thrombin, and plasmin.
Diisopropylfluorophosphate is still available from SIGMA (1-800-325-3010),
cat # D 0879 @ 227.65 / g.
Ethopropazine is still in the current SIGMA catalog, cat # E 2880 @ 16.60 /
5 g.

-----Original Message-----
From: sebres [] 
Sent: Wednesday, November 05, 2003 6:36 PM
To: Histonet (E-mail)
Subject: Re: [Histonet] ethopropazine/acetylcholinesterase histochemistry

Well, I've already dug a little deeper & come up with part of the answer,
but am still in need of advice:  I understand better now that it is
specifically butyrylcholinesterase that ethopropazine is supposed to
inhibit.  I've found some evidence that ethephon is considered a specific
butyrylcholinesterase inhibitor, & this is actually available for purchase
from agricultural supply companies.  Any thoughts out there on whether this
sounds like a viable solution?   Many thanks,  Susan
----- Original Message ----- 
From: "sebres" 
To: "Histonet (E-mail)" 
Sent: Wednesday, November 05, 2003 6:03 PM
Subject: [Histonet] ethopropazine/acetylcholinesterase histochemistry

> I'm teaching a neurohistology class in a research university, mainly 
> Nissl staining, immunohistochemisty & in situ hybridization 
> histochemistry on
> brain sections.  I thought I'd add to the mix a good old fashioned 
> enzyme histochemistry assay, such as the elegant acetylcholinesterase 
> method described in Paxinos & Watson's Rat Brain atlas, which sounds 
> refreshingly simple.  But, to my shock, ethopropazine, since it is now 
> used medicinally (Parsitan), seems to no longer be available except by 
> prescription!  If I understand this correctly, the main purpose of 
> this reagent in this assay
> as a cholinesterase inhibitor, in which case I'm wondering whether it
> work to substitute either physostigmine, or possibly haloperidol, both 
> of which I already have in hand?  My students and I would all be extremely
> grateful for any advice about this!     Susan Bachus, George Mason
> University
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