[Histonet] Cell Block preparation (lengthy)
Bryan Hewlett
bhewlett <@t> cogeco.ca
Tue May 29 16:19:44 CDT 2007
Ronnie,
I have compared a number of methods for preparing cell blocks for IHC and
have the following comment;
Overall, I much prefer the plasma/thrombin method.
Primarily because freshly harvested cells can be collected in plasma,
transported, aliquoted and the cell concentration easily adjusted, prior to
addition of thrombin.
Furthermore, unfixed cells are now completely surrounded by the same
proteinaceous intercellular matrix found in all solid tissues.
This proteinaceous matrix is a necessary and crucial component of all
fixation reactions in tissue and actively participates in the fixation
process.
To my way of thinking, cell blocks produced this way more closely mimic
solid tissues for IHC control purposes!
Once clotted (15 mins including retraction) the cell blocks can be optimally
fixed and processed.
We have used this method for preparing numerous cell blocks for IHC.
The only background staining seen is a specific background, due to secondary
reagents being insufficiently absorbed against human Ig's, this is easily
corrected as necessary.
One caveat, this type of specific background will interfere with
interpretation of staining for Human Ig's, Kappa/Lambda light chains and
albumen,
particularly if agonal imbibition by dying cells occurs.
Bryan
----- Original Message -----
From: "Houston, Ronald" <HoustonR <@t> chi.osu.edu>
To: <histonet <@t> lists.utsouthwestern.edu>
Sent: Tuesday, May 29, 2007 4:15 PM
Subject: [Histonet] Cell Block preparation
Would anyone care to comment on the pros and cons of preparing cell
blocks using the Plamsa/thrombin technique and the Agar method which is
more prominent in the European field?
I am particularly interested in the prevalence of background staining in
ICC. Does the use of plasma interfere with interpretation of the
staining results? I know there have been reports of extraneous tissue
being found in cell blocks coming from a commercially prepared clotting
agent.
Thanks
Ronnie
Ronnie Houston, MS, HT(ASCP)QIHC
Anatomic Pathology Manager
Columbus Children's Hospital
700 Children's Drive
Columbus, OH 43205
-----------------------------------------
Confidentiality Notice: This e-mail message, from Children's
Hospital, Columbus, Ohio, including any attachments, is for the
sole use of the intended recipient(s) and may contain confidential
and privileged information. The recipient is responsible to
maintain the confidentiality of this information and to use the
information only for authorized purposes pursuant to Children's
Hospital's confidentiality policies. If you are not the intended
recipient (or authorized to receive information for the intended
recipient), you are hereby notified that any review, use,
disclosure, distribution, copying, printing, or action taken in
reliance on the contents of this e-mail is strictly prohibited. If
you have received this communication in error, please notify us
immediately by reply e-mail and destroy all copies of the original
message. Thank you.
_______________________________________________
Histonet mailing list
Histonet <@t> lists.utsouthwestern.edu
http://lists.utsouthwestern.edu/mailman/listinfo/histonet
More information about the Histonet
mailing list