Hi Jordan,
So wow! You are doing a Jones with an H&E.
What you are seeing is common when using a water bath and preheating. While
you can perform the stain with this many sections, I would start off with 1-3
slides until you have perfected the technique.
I know that makes you have multiple runs, but you don't want to waste the
tissue or have a lot of precipitate.
1. I would only preheat silver for 5-10 min to avoid excess precipitation and
agitate the solution before immersing your slides.
2. If you use the glass staining rack, make sure no excess water from the water
bath gets in.
3. Rinse silver stains 6x with de-I or distilled water (my original trainers
taught me that).
4. If you can, use an oven, not water bath to heat. Same temp settings as on
the water bath.
5. No metal at all. Use plastic hemostats and rinse them well between uses.
6. Mix your silver and methenemine first, then filter your sliver. Add the
borax sol'n just before use, cut it down to 5ml.
7. The glomeruli take a long while to get to the point where they start to turn
and they have to be dark. Paper bag brown is the what we say.
8. Always use de-I after periodic acid.
When I teach this stain to students, we sometimes use the oven and sometimes
the water bath. The oven cuts down on the precip and we can agitate the slides
better. The gold chloride and hypo will help with the precip, but wipe the
back and sides of the slides well between each change. Be careful not to push
the solution back onto the section.
The new Carson's version uses 50 mL of methenamine silver (5% silver in 3%
methenamine) and 5mL of Borax. It also uses 1% periodic. I was always taught
that 0.5% would give me non-specific staining because it was not sensitive
enough. I trained using the formulation you did, but we also microwaved. We
were specifically animal where I trained, and I have the microwave procedure
somewhere if you want.
Also, others mentioned the procedure on stainsfile. It works as well. I taught
that method for a few years as well.
Good luck and keep me posted.
Sincerely,
Toysha N. Mayer, DHSc, MBA, HT (ASCP)
Assistant Professor/Associate Program Director
HTL Program School of Health Professions
MD Anderson Cancer Center
tnma...@mdanderson.org
713-563-3481 wk
832-710-1837 cell
------------------------------
Message: 2
Date: Thu, 23 Sep 2021 19:49:52 +0000
From: "Hood, Jordan" <jordh...@med.umich.edu>
To: "'histonet@lists.utsouthwestern.edu'"
<histonet@lists.utsouthwestern.edu>
Subject: [Histonet] Jones' Methenamine Silver Stain for Basement
Membranes of Kidney - Issues and Questions
Message-ID: <48bd31f00b074079baca10d963e1b...@med.umich.edu>
Content-Type: text/plain; charset="iso-8859-1"
Hello,
I'm new to histology (and new to histonet), and I work in a small histology lab
specializing in animal tissues that receives requests/submissions from
researchers. I tried (and failed) to perform a Jones' Methenamine Silver stain
on a client's submission of pig kidneys (formalin-fixed, paraffin-embedded, cut
at 2.5 microns), and I need some help troubleshooting this stain since my
co-workers are stumped, too. I used the following procedure from Rowley
Biochemical:
~~~~~
"Fixation: 10% Buffered Neutral Formalin (F-113) or Bouin's Solution (F-40) or
Zenker's (F-155)
Sections: Paraffin, 2 microns
Procedure: Acid washed glassware must be used!!!!
1. Deparaffinize and hydrate to distilled water.
2. Oxidize in Periodic Acid 0.5% (F-396-1) 11 minutes. Wash in chloride-free
water.
3. Prepare Methenamine Silver solution by mixing: 42.5 ml Methenamine 3%
(F-396-2), 2.5 ml Silver Nitrate, 5% (F-396-3) and 12.0 ml Borate Buffer, pH
8.2 (F-396-4).
4. Place slides in the solution and the entire jar in a water bath at 70?C for
approx. 60-75 minutes. Check under microscope when slides appear medium brown
microscopically. Every 10 minutes, once the medium brown color has been
established, rinse a slide in 70?C, chloride free water and check under a
microscope. Rinse again in hot water and return to the hot staining solution.
As the staining time approaches the end point, check the slides, as above,
every 1-2 minutes. The entire procedure must be performed quickly to prevent an
uneven staining of the tissues. The slides should exhibit a brownish- yellow
background, intense black reticulum fibers, and black basement membranes. If
the slides become oversaturated, i.e. too black, destain in a dilute Potassium
Ferricyanide Solution (F-396-11) for one or two dips.
5. Rinse well in distilled water. Tone in Gold Chloride 0.2% (F-396-5), 1
minute. If sections are overtoned place in Sodium Metabisulfite, 3% (F-396-12)
for 1-3 minutes. Rinse well in distilled water.
6. Sodium Thiosulfate 3% (F-396-9), 1-2 miutes. Wash in running tap water, 10
minutes. Rinse well in distilled water.
7. Stain in Harris' Hematoxylin (F-396-6) containing 2-4ml of Glacial Acetic
Acid per 100 ml for 5-15 minutes. Wash in water.
8. Differentiate in Acid Alcohol 1% (F-396-13) until the sections turn red.
9. Blue section in Ammonia Water, 0.3% (F-396-14). Wash thoroughly.
10. Counterstain in Eosin Y, 1%, Alcoholic Solution (F-396-7).
11. Dehydrate in 95% alcohol, absolute alcohol and clear in xylene 3 changes
each. Mount.
Stain Results:
Basement membranes, reticulum fibers: Black
Nuclei: Blue
Cytoplasm, collagen, connective tissue: Pink-orange
References: Jones, D.B., Amer.J.Path. 27:99 (1951). AFIP Manual of Histolocical
Staining Methods, 3rd ed., Ed. L. Luna: NY: McGraw-Hill Publications, c. 1968,
p. 97."
~~~~~
It became apparent that something went wrong during Step 4 when the slides were
in the glass container (not a coplin jar - we have ten slides that we need to
stain so we're using a rectangular glass container that holds ten slides on
their sides - it does require a metal handle to move, but the handle is
flexible and easy to remove after the glass slide rack has been transferred
between containers) of silver solution in the water bath because there was lots
of precipitate on the slides and floating on the surface of the silver solution.
In my first test, I used five test slides (extra slides that we cut from the
same blocks that were submitted to us). I deparaffinized them in coplin jars
(moving them with plastic forceps) and hydrated them to deionized water. I
transferred the slides to a glass slide rack that holds ten slides on their
sides, added five blank slides that were rinsed in deionized water (so that the
displacement of reagents would be equivalent to when we stain our ten "real"
slides after testing is complete), and completed Step 2. I don't recall exactly
how long the glass container of silver solution and the glass container of
deionized water had been heating up in the water bath, but I would estimate
~15-30 minutes. The thermometer said that the water in the bath (not inside the
containers) reached ~60-65 degrees Celsius. The silver solution was clear and
colorless when I made it up, but by the time I put the slides into the warm
silver solution, the solution was beginning to turn a light brown color (though
it was still clear and I did not see any precipitate floating around). I
removed the metal handle of the glass slide rack after the rack was transferred
into the silver solution, but the metal handle did dip into the silver solution
briefly. At some point, I noticed precipitate floating around of the surface of
the silver solution. After ~80 minutes, I used plastic forceps to remove one
test slide from the warm silver solution, dipped it several times into the warm
deionized water to rinse it, and wiped off the back of the slide with gauze.
The amount of precipitate was so extreme that the gauze did nearly nothing. I
showed the slide to one of our pathologists and they could hardly see beyond
the precipitate, but said that they couldn't see any staining of the structure
that they were looking for (I forget exactly what it was, but I know it's
supposed to turn black).
In my second test (to see if the metal holder was the problem) that I performed
immediately after the first test, I used one test slide. I deparaffinized it in
the same coplin jars as before (moving it with plastic forceps) and hydrated it
to deionized water. I used new glass containers for the periodic acid and
deionized water rinse in Step 2, for making the silver solution in Step 3, and
for the warm silver solution and warm deionized water in Step 4. I used plastic
forceps to move the slide into the periodic acid, and propped it up in the
container so that no glass rack or metal handle was used at all. I used plastic
forceps to transfer the slide to the deionized water rinse, and dunked it
several times and swished the slide around a bit. I used plastic forceps to
transfer the slide into the warm(-ish) silver solution and propped it up
against the side again. After approximately 20 minutes, I saw precipitate
floating around, and I used plastic forceps to remove the slide from the silver
solution. I dipped the slide into the warm(-ish) deionized water several times,
and saw that the precipitate was again covering the slide and the tissue so I
stopped there for the day.
We purchased all of the reagents listed in the above procedure from Rowley
Biochemical (except for the Glacial Acetic Acid mentioned in Step 7, but I
didn't even get that far).
Questions:
1. Could this indicate that the acid-washing was not done correctly? I made up
a ~1% Hydrochloric Acid solution (with deionized water) and filled a plastic
bin with the solution (I rinsed the bin with deionized water first). I then
submerged all glassware (in several batches) for at least five minutes, then
rinsed well with deionized water (not by filling a bin - I just used the hose
of deionized water in our lab sink and poured it over the glassware) and left
them to air-dry overnight.
2. Are using acid-washed glassware and avoiding metal even necessary
precautions after the sodium thiosulphate in Step 6? I read that sodium
thiosulphate "stops the reaction," and the procedure stops specifically saying
to use deionized water after Step 6 and starts saying to use just "water" or
"tap water." My lab refers to our waters as either "tap" or "deionized," so I'm
assuming that using my deionized water is fine when the procedure calls for
"distilled" or "dechlorinated."
I don't even know enough to ask more questions, but I'm sure many more will
arise after I test the stain again next week, so I welcome any and all advice
about silver stains, acid-cleaning glassware, and literally anything else...
Thank you!!!
Jordan H.
University of Michigan
Ann Arbor, MI
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