Bengaluru: Researchers have identified a stem cell protein that may play an important role in finding cure for blood cancer.\r\n\r\nThe study, done on mice, suggests a stem cell protein called Asrij is a novel regulator of wild type tumour suppressor p53 stability in hematopoietic stem cells (HSCs).\r\n\r\nIt could help design targeted therapies for myeloproliferative disease, a group of slow-growing blood cancers, according to researchers, including Maneesha S. Inamdar from the Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) in Bengaluru.\r\n\r\n"We provide a new mouse model resembling myeloproliferative disease and identify a post-translational regulator of wild type p53 essential for maintaining HSC quiescence that could be a potential target for pharmacological intervention," the team said.\r\n\r\nAccording to the study, published in the journal Blood, inactivation of the tumour suppressor p53 is essential for unrestrained growth of cancers. But only 11 per cent of hematological malignancies have mutant p53. \r\n\r\nMechanisms that cause wild type p53 dysfunction and promote leukemia are inadequately deciphered, suggests the study. \r\n\r\nThe stem cell protein Asrij is misexpressed in several human hematological malignancies and implicated in the p53 pathway and DNA damage response, the team said.\r\n\r\nFor the study, the team generated the first Asrij null (knockout, KO) in mice and showed they are viable and fertile with no gross abnormalities. However, by six months, they exhibited increased peripheral blood cell counts, splenomegaly and an expansion of bone marrow HSCs with higher myeloid output.