Maternal Microchimerism Leads to the Presence of Interleukin-2 in Interleukin-2 Knock out Mice: Implications for the Role of Interleukin-2 in Thymic FunctionCellular Immunology
AbstractThe role of interleukin-2 (IL-2) in thymic development is uncertain. Not surprisingly, IL-2 knockout (KO) mice have been used to address this question. However, as we report here, such mice are chimeric, containing both IL-2 KO cells and IL-2-expressing cells transferred in utero from their heterozygous mothers. These cells produce IL-2 in amounts detectable by conventional means, and their presence in lymphoid tissues confounds efforts to define the true IL-2 KO phenotype. To minimize the amount of IL-2 available to the thymus, we subjected recombinase activating gene-1 KO mice to bone marrow transplantation using IL-2 KO donors, and then followed the reconstitution of the thymus. The thymuses of these mice became increasingly aberrant over time, including abnormalities in both stromal cells and thymocytes. These results demonstrate that IL-2 is critical to several aspects of thymic function, a finding previously obscured by the presence of IL-2 in IL-2 KO mice.
Citation InformationLucile E. Wrenshall, Elliot T. Stevens, Deandra R. Smith and John D. Miller. "Maternal Microchimerism Leads to the Presence of Interleukin-2 in Interleukin-2 Knock out Mice: Implications for the Role of Interleukin-2 in Thymic Function" Cellular Immunology Vol. 245 Iss. 2 (2007) p. 80 - 90 ISSN: 00088749
Available at: http://works.bepress.com/lucile_wrenshall/6/