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In order to clarify the role of immunity on the development of dermatitis in NC mice, the following experiments were carried out. In neonatal thymectomized NC, thymic reconstituted NC-nu/nu, and passively serum transferred NC-nu/nu mice, incidence of the dermatitis was examined. Immune response to sheep red blood cells (SRBC) and number of Thy-1 positive cells in mesenteric lymph node were used as indicators of the cell mediated immunity. Although antibody to SRBC and the number of Thy-1 positive cells in neonatal thymectomized NC mice were greatly reduced, development of the dermatitis in these mice was not suppressed at all. On the contrary, thymic reconstituted NC-nu/nu mice which recovered immune response to SRBC and number of Thy-1 positive cells to the normal levels did not develop the dermatitis. Passive transfer of the serum obtained from NC mice which developed severe dermatitis, could not induce the dermatitis in NC-nu/nu mice. These results suggest that the dermatitis in NC mice is not mediated by immune mechanisms but by other complexed factors. The absence of the dermatitis in NC-nu/nu mice may be due to nu gene effects other than those of immune defect.

The Role of Immunity on the Development of the Dermatitis in NC Mice