title: The mechanism accounted for the silver staining "fast technique" development and its histochemical meaning: I. The correlation between the silver staining intensity and the tissue bound ferric ion and some other tissue histochemical reactivities.
abstract: The mechanism accounted to accomplish the silver staining "fast technique" on tissues sections was studied towards the correlation among histophotometric measures concerning the silver staining intensity and the intensity provided by some histochemical reactions performed on spleen and liver sections from rats and pigs. By treating previously these histological sections with thioglycolate or oxalate solutions in progressive concentrations and afterwards subjecting them to a silver staining "fast technique", it was demonstrated that the silver staining intensity decreases proportionally to the thioglycolate or the oxalate solution concentration. The regression line of the silver staining intensity on the thioglycolate or the oxalate solution concentration was established, as well as its regression coefficient. On the other hand, on histological sections previously subjected to the thioglycolate or the oxalate treatment, some histochemical techniques were performed and the histophotometric measures concerning the intensity of each histochemical technique used were taken and its regression line, as well as its regression coefficient were established. By comparing the silver staining intensity regression line (or its regression coefficient) with the regression lines established for the histochemical techniques used, it was tested the correlation between the silver staining and the reactivity of some reactive groups contained into the tissues. In this manner, the influence of such reactive groups on the silver staining development was tested. The results show that there is no correlation between the silver staining intensity and the reactivity degree of the reducing groups (-SH- and carbonyl group), the 1-2-glycolic group, as well as of some protein reactive groups (phenol, imidazole, carboxylic groups). On the other hand, taking into account the respective regression lines and its regression coefficient, the comparison between the silver staining intensity and the Prussian blue reaction intensity shows a close relationship between them. This finding suggests that for the silver staining "fast technique" the tissue bound ferric ion accomplishes a very important role and can be accounted for its mechanism and its histochemical meaning.
authors: Departimento de Histologia e Embriologia do Instituto de Biologia da Universidade de Campinas, São Paulo, Brasil.
authors: W A
authors: WA
authors: Hadler
authors: O
authors: O
authors: de Lucca
mesh_terms: D000818:Animals; D006651:Histocytochemistry / Q000379:methods*; D008099:Liver / Q000032:analysis*; D010783:Photometry; D051381:Rats; D012044:Regression Analysis; D012834:Silver; D013154:Spleen / Q000032:analysis*; D013194:Staining and Labeling; D013552:Swine
chemical_list: D012834:Silver