[Histonet] RE: Retic jargon

Renko, Heather D. Heather.D.Renko <@t> osfhealthcare.org
Fri Nov 30 12:39:16 CST 2007

We say "Reticulum" ??? 
The term reticulin was coined in 1892 by M. Siegfried.[2] <http://en.wikipedia.org/wiki/> 
Today the term reticulin or reticular fiber is restricted to fibers composed of type III collagen <http://en.wikipedia.org/wiki/Collagen> . However, during the pre-molecular era, there was confusion in the use of the term 'reticulin', which was used to describe two structures:
*	the argyrophilic (silver staining) fibrous structures present in basement membranes <http://en.wikipedia.org/wiki/Basement_membrane>  
*	histologically similar fibers present in developing connective tissue[3] <http://en.wikipedia.org/wiki/> . 
The history of the reticulin silver stain is reviewed by Puchtler et al. (1978).[4] <http://en.wikipedia.org/wiki/>  The abstract of this paper says:
		Maresch (1905) introduced Bielschowsky's silver impregnation technic for neurofibrils as a stain for reticulum fibers, but emphasized the nonspecificity of such procedures. This lack of specificity has been confirmed repeatedly. Yet, since the 1920's the definition of "reticulin" and studies of its distribution were based solely on silver impregnation technics. The chemical mechanism and specificity of this group of stains is obscure. Application of Gomori's and Wilder's methods to human tissues showed variations of staining patterns with the fixatives and technics employed. Besides reticulum fibers, various other tissue structures, e.g. I bands of striated muscle, fibers in nervous tissues, and model substances, e.g. polysaccharides, egg white, gliadin, were also stained. Deposition of silver compounds on reticulum fibers was limited to an easily removable substance; the remaining collagen component did not bind silver. These histochemical studies indicate that silver impregnation technics for reticulum fibers have no chemical significance and cannot be considered as histochemical technics for "reticulin" or type III collagen.

 Who'd a thunk it?  TGIF

Heather D. Renko, Histology Coordinator
OSF Saint Anthony Medical Center
5666 East State Street
Rockford, Illinois 61108
Direct: 815-395-5410
Heather.D.Renko <@t> osfhealthcare.org

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