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Release of splenic cells into the blood of guinea-pigs of different ages.

Emigration of splenic cells into the blood was studied through determination of the number of white blood cells in splenic afferent and efferent blood. The lymphocytes were divided into subgroups based on differing mitochondrial content. A significant output of splenic cells into the blood was demonstrated in newborn guinea-pigs, and the splenic veno-arterial lymphocyte difference increased with the age of the animals. It comprised lymphocytes of all mitochondrial classes. The highest increase in output occurred between 4 and 8 weeks of age. The splenic veno-arterial lymphocyte difference was not related to splenic weight. A negative correlation between the release of cells from the spleen and the content of lymphocytes in the peripheral blood was established in some of the groups and may be the consequence of a feed-back mechanism. 
 
 
 
The low splenic output of lymphocytes with 0–5 mitochondria (smallest lymphocytes) in the very young animals and the relation of these cells to thymic function are discussed. 
 
 
 
Normal values for the total number of white cells in the blood, as well as for lymphocytes with different mitochondrial content, and the haematocrit in guinea-pigs of different ages are presented.