Description: The monoclonal phpu13 recognizes human and mouse PU.1, a member of the ets family of transcription factors. This 42 kDa protein was originally identified as Spi-1, a proto-oncogene, for its role in Friend virus-induced murine erythroleukemia. Expression of PU.1 plays a critical role in lymphocyte and myeloid development. Knock-out mice are neonatal lethal and lack myeloid, T and B cells. In addition erythroid development is also altered. Protein expression levels help guarantee proper development; higher levels in myeloid cells compared to lymphocytes. PU.1 controls transcription of several proteins including CD11b, CD18, Gata2, IRF4, CD20, CD10, and CD79.
Disruption of PU.1 expression may play a role in several specific leukemias; such as B-chronic lymphocytic leukemia, mantle cell lymphoma, follicular lymphoma, marginal zone lymphoma, Burkitt lymphoma, diffuse large cell lymphoma, diffuse large B-cell lymphoma, T-cell rich B-cell lymphoma, and nodular lymphocyte predominant Hodgkin.