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Electrophoretical findings of serum proteins and electron microscopic observation of lymphoid cells in peripheral blood of equine infectious anemia


, : Electrophoretical findings of serum proteins and electron microscopic observation of lymphoid cells in peripheral blood of equine infectious anemia. Research Bulletin of Obihiro University Series I 10(1): 25-44

The fundamental nature of chronic equine infectious anemia (EIA) was investigated using 2 horses artificially infected with chronic EIA. No siderocytes were detected in the peripheral blood of no. 28 horse and the immunodiffusion test of the blood was positive. The infected blood from no. 28 horse was inoculated into no. 30, a healthy horse. The same procedure was applied to no. 31 healthy horse, using the infected blood from no. 30 horse. No. 31 horse showed the 1st signs of pyrexia in 36 days and 3 times in the course of 387 days after inoculation. This together with histopathological liver biopsy findings suggests that no. 31 horse was infected with EIA. For no. 31 horse, the immunodiffusion test was positive in 52 days and siderocytes, together with a number of lymphoid cells, were detected in 37 days, their maximal number amounting to 49/10,000 leukocytes. No. 31 horse did not show symptoms of pyrexia over a period of 213 days and the last prexia and siderocytes in the peripheral blood disappeared after 183 days, indicating that no. 31 horse was infected with typical chronic EIA. Leukocytes were collected from the peripheral blood in which no siderocytes were detectable by EM. Small round cells were occasionally found; most of them included locally developed, and vesicularly swelling, rough surfaced endoplasmic reticulum (r-ER). Cells containing extremely expanded r-ER of low electron density were rarely observed. A small number of cells having a structure similar to Russel body around the concave part of the nucleus were also observed. These cells were clearly distinguishable from lymphocytes and plasma cells by their ultrafine structure and grouped into a category of small lymphoid cells. The percentages of albumin, .alpha.1-globulin (glob.), .alpha.2-glob., .beta.-glob. and .gamma.-glob. in the serum protein were 26.0, 9.5, 11.0, 25.5 and 28.0, respectively. .gamma.-Glob., which increased slightly at the early stage of infection, decreased 277 days after inoculation.

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