Abstract
Natural killer and natural suppressor activities of the rat endometrial granulated cells were assayed on days 13 and 14 of pregnancy or pseudopregnancy. Metrial gland granulated cells were used as endometrial granulated cells. The natural killer activities of metrial gland granulated cells and other cells were determined by means of Hashimoto-Sudo test with K562 cells as targets. The estimation of natural killer activity included removal of the cells sticking to glass from a suspension of material gland granulated cells. Cytochemically, metrial gland granulated cells were identified by the presence of PAS-positive granules in the cytoplasm after treatment of the cells with diastase and identification of a specific antigen with the help of specific antisera. The natural killer activity of metrial gland granulated cells was twice weaker than that of splenocytes from the same pregnant or pseudopregnant females. The level of natural killer activity was proportional to the content of metrial gland granulated cells in a cell system. These data suggest that the natural killer activity of metrial gland granulated cells is realized via their contact with cell targets. Natural killer and suppressor activities were determined simultaneously for metrial gland granulated cells and splenocytes of the same rat with common cell targets. When estimating the natural suppressor activity of metrial gland granulated cells, the splenocytes of the same rat were used as an effector in a natural killer test. Various amounts of metrial gland granulated cells were added to the effector: target system at a ratio of 50 : 1. The natural suppressor activity of metrial gland granulated cells did not depend on the amount of metrial gland granulated cells present in a natural killer system. After fractionation in a Percoll gradient, the highest natural killer activity was recorded in a 60% Percoll fraction. The highest and lowest natural suppressor activities were recorded in 30% and 60% Percoll fractions, respectively. The culture medium was characterized by natural suppressor activity as well. The differences in mean areas of metrial gland granulated cells in 30 and 60% Percoll fractions between the pregnant (144.7 ± 13.4 and 75.0 ± 12.5 µm2, respectively) and pseudopregnant (97.5 ± 4.9 and 69.2 ± 3.5 µm2, respectively) females were reliable. The natural killer activity was estimated in all studied 23 samples of metrial gland granulated cells, among which 18 (79.6 ± 7.8%) displayed the natural suppressor activity as well. The absence of natural suppressor activity in five samples was combined with the absence of this activity in their culture medium and with a reduction in the mean area of metrial gland granulated cells in 30% Percoll fraction to 109 ± 5 µm2. The data obtained confirm the known data on a low killer activity of metrial gland granulated cells and demonstrated for the first time the natural suppressor activity of these cells. It was concluded that the natural suppressor activity of metrial gland granulated cells is due to their differentiation from metrial gland granulated cells with natural killer activity.
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Translated from Ontogenez, Vol. 36, No. 1, 2005, pp. 26–34.
Original Russian Text Copyright © 2005 by Podporina, Mikhailov.
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Podporina, A.T., Mikhailov, V.M. Immunosuppressor activity of rat endometrial granulated cells and their differentiation. Russ J Dev Biol 36, 21–28 (2005). https://doi.org/10.1007/s11174-005-0004-z
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DOI: https://doi.org/10.1007/s11174-005-0004-z