Description |
Recombinant full-length human PIM 2 containing N-terminal GST tag was expressed by baculovirus in Sf 9 insect cells. A 334-amino acid sequence of the clone was deduced, which showed 90% identity with the mouse Pim2 protein. Like mouse Pim2, the human protein appears to be a serine threonine kinase. Northern blot analysis detected 2 PIM2 transcripts in all tissues tested, but most abundantly in hematopoietic tissues, spleen, thymus, and peripheral blood leukocytes, as well as in testis, small intestine, and colon. It was also highly expressed in human leukemic and lymphoma cell lines and a colorectal adenocarcinoma cell line. The results suggested a role for PIM2 in proliferating cells as well as during meiosis. Potential functions were investigated for the pim family of kinases in factor-dependent murine hematopoietic cells and indicate that pim-2 functions similarly to pim-1 as a pro-survival kinase and suggest that BAD is a legitimate PIM-2 substrate. It was concluded that the transcriptional induction of Pim-2 initiated a novel NF-kappaB activation pathway that regulates cell survival. |